flt.utils.muxer: replace queue with array
[babeltrace.git] / src / plugins / utils / muxer / muxer.c
index 7404e1e4ab023a78e9e58ce4b2abfc77c6f88a01..fa049cf0dd939b65272dc1d02dc1ab1f82bfdb42 100644 (file)
@@ -1,23 +1,7 @@
 /*
- * Copyright 2017 Philippe Proulx <pproulx@efficios.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
+ * SPDX-License-Identifier: MIT
  *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
+ * Copyright 2017 Philippe Proulx <pproulx@efficios.com>
  */
 
 #define BT_COMP_LOG_SELF_COMP (muxer_comp->self_comp)
@@ -37,6 +21,7 @@
 #include <string.h>
 
 #include "plugins/common/muxing/muxing.h"
+#include "plugins/common/param-validation/param-validation.h"
 
 #include "muxer.h"
 
@@ -55,10 +40,13 @@ struct muxer_upstream_msg_iter {
        struct muxer_comp *muxer_comp;
 
        /* Owned by this, NULL if ended */
-       bt_self_component_port_input_message_iterator *msg_iter;
+       bt_message_iterator *msg_iter;
 
        /* Contains `const bt_message *`, owned by this */
-       GQueue *msgs;
+       GPtrArray *msgs;
+
+       /* Index of the next message in `msgs` to return */
+       guint next_msg;
 };
 
 enum muxer_msg_iter_clock_class_expectation {
@@ -106,16 +94,20 @@ struct muxer_msg_iter {
         * MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NOT_ABS_SPEC_UUID.
         */
        bt_uuid_t expected_clock_class_uuid;
+
+       /*
+        * Saved error.  If we hit an error in the _next method, but have some
+        * messages ready to return, we save the error here and return it on
+        * the next _next call.
+        */
+       bt_message_iterator_class_next_method_status next_saved_status;
+       const struct bt_error *next_saved_error;
 };
 
 static
 void empty_message_queue(struct muxer_upstream_msg_iter *upstream_msg_iter)
 {
-       const bt_message *msg;
-
-       while ((msg = g_queue_pop_head(upstream_msg_iter->msgs))) {
-               bt_message_put_ref(msg);
-       }
+       g_ptr_array_set_size(upstream_msg_iter->msgs, 0);
 }
 
 static
@@ -130,16 +122,17 @@ void destroy_muxer_upstream_msg_iter(
 
        muxer_comp = muxer_upstream_msg_iter->muxer_comp;
        BT_COMP_LOGD("Destroying muxer's upstream message iterator wrapper: "
-               "addr=%p, msg-iter-addr=%p, queue-len=%u",
+               "addr=%p, msg-iter-addr=%p, queue-len=%u, next-msg=%u",
                muxer_upstream_msg_iter,
                muxer_upstream_msg_iter->msg_iter,
-               muxer_upstream_msg_iter->msgs->length);
-       bt_self_component_port_input_message_iterator_put_ref(
+               muxer_upstream_msg_iter->msgs->len,
+               muxer_upstream_msg_iter->next_msg);
+
+       bt_message_iterator_put_ref(
                muxer_upstream_msg_iter->msg_iter);
 
        if (muxer_upstream_msg_iter->msgs) {
-               empty_message_queue(muxer_upstream_msg_iter);
-               g_queue_free(muxer_upstream_msg_iter->msgs);
+               g_ptr_array_free(muxer_upstream_msg_iter->msgs, TRUE);
        }
 
        g_free(muxer_upstream_msg_iter);
@@ -147,7 +140,7 @@ void destroy_muxer_upstream_msg_iter(
 
 static
 int muxer_msg_iter_add_upstream_msg_iter(struct muxer_msg_iter *muxer_msg_iter,
-               bt_self_component_port_input_message_iterator *self_msg_iter)
+               bt_message_iterator *self_msg_iter)
 {
        int ret = 0;
        struct muxer_upstream_msg_iter *muxer_upstream_msg_iter =
@@ -155,16 +148,19 @@ int muxer_msg_iter_add_upstream_msg_iter(struct muxer_msg_iter *muxer_msg_iter,
        struct muxer_comp *muxer_comp = muxer_msg_iter->muxer_comp;
 
        if (!muxer_upstream_msg_iter) {
-               BT_COMP_LOGE_STR("Failed to allocate one muxer's upstream message iterator wrapper.");
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Failed to allocate one muxer's upstream message iterator wrapper.");
                goto error;
        }
 
        muxer_upstream_msg_iter->muxer_comp = muxer_comp;
        muxer_upstream_msg_iter->msg_iter = self_msg_iter;
-       bt_self_component_port_input_message_iterator_get_ref(muxer_upstream_msg_iter->msg_iter);
-       muxer_upstream_msg_iter->msgs = g_queue_new();
+       bt_message_iterator_get_ref(muxer_upstream_msg_iter->msg_iter);
+       muxer_upstream_msg_iter->msgs =
+               g_ptr_array_new_with_free_func((GDestroyNotify) bt_message_put_ref);
        if (!muxer_upstream_msg_iter->msgs) {
-               BT_COMP_LOGE_STR("Failed to allocate a GQueue.");
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Failed to allocate a GPtrArray.");
                goto error;
        }
 
@@ -178,7 +174,7 @@ int muxer_msg_iter_add_upstream_msg_iter(struct muxer_msg_iter *muxer_msg_iter,
        goto end;
 
 error:
-       g_free(muxer_upstream_msg_iter);
+       destroy_muxer_upstream_msg_iter(muxer_upstream_msg_iter);
        ret = -1;
 
 end:
@@ -198,7 +194,7 @@ bt_self_component_add_port_status add_available_input_port(
        BT_ASSERT(muxer_comp);
        port_name = g_string_new("in");
        if (!port_name) {
-               BT_COMP_LOGE_STR("Failed to allocate a GString.");
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp, "Failed to allocate a GString.");
                status = BT_SELF_COMPONENT_ADD_PORT_STATUS_MEMORY_ERROR;
                goto end;
        }
@@ -207,7 +203,8 @@ bt_self_component_add_port_status add_available_input_port(
        status = bt_self_component_filter_add_input_port(
                self_comp, port_name->str, NULL, NULL);
        if (status != BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) {
-               BT_COMP_LOGE("Cannot add input port to muxer component: "
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Cannot add input port to muxer component: "
                        "port-name=\"%s\", comp-addr=%p, status=%s",
                        port_name->str, self_comp,
                        bt_common_func_status_string(status));
@@ -246,28 +243,41 @@ void destroy_muxer_comp(struct muxer_comp *muxer_comp)
        g_free(muxer_comp);
 }
 
+static
+struct bt_param_validation_map_value_entry_descr muxer_params[] = {
+       BT_PARAM_VALIDATION_MAP_VALUE_ENTRY_END
+};
+
 BT_HIDDEN
-bt_component_class_init_method_status muxer_init(
+bt_component_class_initialize_method_status muxer_init(
                bt_self_component_filter *self_comp_flt,
                bt_self_component_filter_configuration *config,
                const bt_value *params, void *init_data)
 {
-       bt_component_class_init_method_status status =
-               BT_COMPONENT_CLASS_INIT_METHOD_STATUS_OK;
+       bt_component_class_initialize_method_status status;
        bt_self_component_add_port_status add_port_status;
        bt_self_component *self_comp =
                bt_self_component_filter_as_self_component(self_comp_flt);
        struct muxer_comp *muxer_comp = g_new0(struct muxer_comp, 1);
        bt_logging_level log_level = bt_component_get_logging_level(
                bt_self_component_as_component(self_comp));
+       enum bt_param_validation_status validation_status;
+       gchar *validate_error = NULL;
 
        BT_COMP_LOG_CUR_LVL(BT_LOG_INFO, log_level, self_comp,
                "Initializing muxer component: "
                "comp-addr=%p, params-addr=%p", self_comp, params);
 
        if (!muxer_comp) {
+               /*
+                * Don't use BT_COMP_LOGE_APPEND_CAUSE, as `muxer_comp` is not
+                * initialized.
+                */
                BT_COMP_LOG_CUR_LVL(BT_LOG_ERROR, log_level, self_comp,
                        "Failed to allocate one muxer component.");
+               BT_CURRENT_THREAD_ERROR_APPEND_CAUSE_FROM_COMPONENT(self_comp,
+                       "Failed to allocate one muxer component.");
+                       status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
@@ -275,36 +285,35 @@ bt_component_class_init_method_status muxer_init(
        muxer_comp->self_comp = self_comp;
        muxer_comp->self_comp_flt = self_comp_flt;
 
+       validation_status = bt_param_validation_validate(params,
+               muxer_params, &validate_error);
+       if (validation_status == BT_PARAM_VALIDATION_STATUS_MEMORY_ERROR) {
+               status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
+               goto error;
+       } else if (validation_status == BT_PARAM_VALIDATION_STATUS_VALIDATION_ERROR) {
+               status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
+               BT_COMP_LOGE_APPEND_CAUSE(self_comp, "%s", validate_error);
+               goto error;
+       }
+
        bt_self_component_set_data(self_comp, muxer_comp);
        add_port_status = add_available_input_port(self_comp_flt);
        if (add_port_status != BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) {
-               BT_COMP_LOGE("Cannot ensure that at least one muxer component's input port is available: "
+               BT_COMP_LOGE_APPEND_CAUSE(self_comp,
+                       "Cannot ensure that at least one muxer component's input port is available: "
                        "muxer-comp-addr=%p, status=%s",
-                       muxer_comp,
-                       bt_common_func_status_string(add_port_status));
-               if (add_port_status ==
-                               BT_SELF_COMPONENT_ADD_PORT_STATUS_MEMORY_ERROR) {
-                       status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_MEMORY_ERROR;
-               } else {
-                       status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_ERROR;
-               }
-
+                       muxer_comp, bt_common_func_status_string(add_port_status));
+               status = (int) add_port_status;
                goto error;
        }
 
        add_port_status = create_output_port(self_comp_flt);
        if (add_port_status != BT_SELF_COMPONENT_ADD_PORT_STATUS_OK) {
-               BT_COMP_LOGE("Cannot create muxer component's output port: "
+               BT_COMP_LOGE_APPEND_CAUSE(self_comp,
+                       "Cannot create muxer component's output port: "
                        "muxer-comp-addr=%p, status=%s",
-                       muxer_comp,
-                       bt_common_func_status_string(add_port_status));
-               if (add_port_status ==
-                               BT_SELF_COMPONENT_ADD_PORT_STATUS_MEMORY_ERROR) {
-                       status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_MEMORY_ERROR;
-               } else {
-                       status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_ERROR;
-               }
-
+                       muxer_comp, bt_common_func_status_string(add_port_status));
+               status = (int) add_port_status;
                goto error;
        }
 
@@ -312,17 +321,15 @@ bt_component_class_init_method_status muxer_init(
                "comp-addr=%p, params-addr=%p, muxer-comp-addr=%p",
                self_comp, params, muxer_comp);
 
+       status = BT_COMPONENT_CLASS_INITIALIZE_METHOD_STATUS_OK;
        goto end;
 
 error:
        destroy_muxer_comp(muxer_comp);
        bt_self_component_set_data(self_comp, NULL);
 
-       if (status == BT_COMPONENT_CLASS_INIT_METHOD_STATUS_OK) {
-               status = BT_COMPONENT_CLASS_INIT_METHOD_STATUS_ERROR;
-       }
-
 end:
+       g_free(validate_error);
        return status;
 }
 
@@ -338,16 +345,16 @@ void muxer_finalize(bt_self_component_filter *self_comp)
 }
 
 static
-bt_self_component_port_input_message_iterator_create_from_message_iterator_status
+bt_message_iterator_create_from_message_iterator_status
 create_msg_iter_on_input_port(struct muxer_comp *muxer_comp,
                struct muxer_msg_iter *muxer_msg_iter,
                bt_self_component_port_input *self_port,
-               bt_self_component_port_input_message_iterator **msg_iter)
+               bt_message_iterator **msg_iter)
 {
        const bt_port *port = bt_self_component_port_as_port(
                bt_self_component_port_input_as_self_component_port(
                        self_port));
-       bt_self_component_port_input_message_iterator_create_from_message_iterator_status
+       bt_message_iterator_create_from_message_iterator_status
                status;
 
        BT_ASSERT(port);
@@ -356,10 +363,11 @@ create_msg_iter_on_input_port(struct muxer_comp *muxer_comp,
        // TODO: Advance the iterator to >= the time of the latest
        //       returned message by the muxer message
        //       iterator which creates it.
-       status = bt_self_component_port_input_message_iterator_create_from_message_iterator(
+       status = bt_message_iterator_create_from_message_iterator(
                muxer_msg_iter->self_msg_iter, self_port, msg_iter);
-       if (status != BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK) {
-               BT_COMP_LOGE("Cannot create upstream message iterator on input port: "
+       if (status != BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK) {
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Cannot create upstream message iterator on input port: "
                        "port-addr=%p, port-name=\"%s\"",
                        port, bt_port_get_name(port));
                goto end;
@@ -374,13 +382,12 @@ end:
 }
 
 static
-bt_component_class_message_iterator_next_method_status muxer_upstream_msg_iter_next(
+bt_message_iterator_class_next_method_status muxer_upstream_msg_iter_next(
                struct muxer_upstream_msg_iter *muxer_upstream_msg_iter,
                bool *is_ended)
 {
-       struct muxer_comp *muxer_comp =
-               muxer_upstream_msg_iter->muxer_comp;
-       bt_component_class_message_iterator_next_method_status status;
+       struct muxer_comp *muxer_comp = muxer_upstream_msg_iter->muxer_comp;
+       bt_message_iterator_class_next_method_status status;
        bt_message_iterator_next_status input_port_iter_status;
        bt_message_array_const msgs;
        uint64_t i;
@@ -390,7 +397,7 @@ bt_component_class_message_iterator_next_method_status muxer_upstream_msg_iter_n
                "muxer-upstream-msg-iter-wrap-addr=%p, msg-iter-addr=%p",
                muxer_upstream_msg_iter,
                muxer_upstream_msg_iter->msg_iter);
-       input_port_iter_status = bt_self_component_port_input_message_iterator_next(
+       input_port_iter_status = bt_message_iterator_next(
                muxer_upstream_msg_iter->msg_iter, &msgs, &count);
        BT_COMP_LOGD("Upstream message iterator's \"next\" method returned: "
                "status=%s",
@@ -403,7 +410,10 @@ bt_component_class_message_iterator_next_method_status muxer_upstream_msg_iter_n
                 * valid: it must be considered for muxing operations.
                 */
                BT_COMP_LOGD_STR("Validated upstream message iterator wrapper.");
-               BT_ASSERT(count > 0);
+               BT_ASSERT_DBG(count > 0);
+
+               g_ptr_array_set_size(muxer_upstream_msg_iter->msgs, count);
+               muxer_upstream_msg_iter->next_msg = 0;
 
                /* Move messages to our queue */
                for (i = 0; i < count; i++) {
@@ -412,10 +422,10 @@ bt_component_class_message_iterator_next_method_status muxer_upstream_msg_iter_n
                         * (muxer_msg_iter_do_next_one()) consumes
                         * from the head first.
                         */
-                       g_queue_push_tail(muxer_upstream_msg_iter->msgs,
-                               (void *) msgs[i]);
+                       g_ptr_array_index(muxer_upstream_msg_iter->msgs, i)
+                               = (gpointer *) msgs[i];
                }
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
                break;
        case BT_MESSAGE_ITERATOR_NEXT_STATUS_AGAIN:
                /*
@@ -423,7 +433,7 @@ bt_component_class_message_iterator_next_method_status muxer_upstream_msg_iter_n
                 * valid anymore. Return
                 * BT_MESSAGE_ITERATOR_NEXT_STATUS_AGAIN immediately.
                 */
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_AGAIN;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_AGAIN;
                break;
        case BT_MESSAGE_ITERATOR_NEXT_STATUS_END:       /* Fall-through. */
                /*
@@ -432,13 +442,22 @@ bt_component_class_message_iterator_next_method_status muxer_upstream_msg_iter_n
                 * message.
                 */
                *is_ended = true;
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
+               break;
+       case BT_MESSAGE_ITERATOR_NEXT_STATUS_ERROR:
+       case BT_MESSAGE_ITERATOR_NEXT_STATUS_MEMORY_ERROR:
+               /* Error status code */
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Upstream iterator's next method returned an error: status=%s",
+                       bt_common_func_status_string(input_port_iter_status));
+               status = (int) input_port_iter_status;
                break;
        default:
-               /* Error or unsupported status code */
-               BT_COMP_LOGE("Error or unsupported status code: "
-                       "status-code=%d", input_port_iter_status);
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
+               /* Unsupported status code */
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Unsupported status code: status=%s",
+                       bt_common_func_status_string(input_port_iter_status));
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                break;
        }
 
@@ -456,8 +475,8 @@ int get_msg_ts_ns(struct muxer_comp *muxer_comp,
        const bt_stream_class *stream_class = NULL;
        bt_message_type msg_type;
 
-       BT_ASSERT(msg);
-       BT_ASSERT(ts_ns);
+       BT_ASSERT_DBG(msg);
+       BT_ASSERT_DBG(ts_ns);
        BT_COMP_LOGD("Getting message's timestamp: "
                "muxer-msg-iter-addr=%p, msg-addr=%p, "
                "last-returned-ts=%" PRId64,
@@ -491,7 +510,7 @@ int get_msg_ts_ns(struct muxer_comp *muxer_comp,
 
        switch (msg_type) {
        case BT_MESSAGE_TYPE_EVENT:
-               BT_ASSERT(bt_message_event_borrow_stream_class_default_clock_class_const(
+               BT_ASSERT_DBG(bt_message_event_borrow_stream_class_default_clock_class_const(
                                msg));
                clock_snapshot = bt_message_event_borrow_default_clock_snapshot_const(
                        msg);
@@ -559,7 +578,7 @@ int get_msg_ts_ns(struct muxer_comp *muxer_comp,
 
                break;
        case BT_MESSAGE_TYPE_MESSAGE_ITERATOR_INACTIVITY:
-               clock_snapshot = bt_message_message_iterator_inactivity_borrow_default_clock_snapshot_const(
+               clock_snapshot = bt_message_message_iterator_inactivity_borrow_clock_snapshot_const(
                        msg);
                break;
        default:
@@ -571,7 +590,8 @@ int get_msg_ts_ns(struct muxer_comp *muxer_comp,
 
        ret = bt_clock_snapshot_get_ns_from_origin(clock_snapshot, ts_ns);
        if (ret) {
-               BT_COMP_LOGE("Cannot get nanoseconds from Epoch of clock snapshot: "
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Cannot get nanoseconds from Epoch of clock snapshot: "
                        "clock-snapshot-addr=%p", clock_snapshot);
                goto error;
        }
@@ -608,7 +628,7 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
        const uint8_t *cc_uuid;
        const char *cc_name;
 
-       BT_ASSERT(clock_class);
+       BT_ASSERT_DBG(clock_class);
        cc_uuid = bt_clock_class_get_uuid(clock_class);
        cc_name = bt_clock_class_get_name(clock_class);
 
@@ -646,7 +666,8 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
        switch (muxer_msg_iter->clock_class_expectation) {
        case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_ABSOLUTE:
                if (!bt_clock_class_origin_is_unix_epoch(clock_class)) {
-                       BT_COMP_LOGE("Expecting an absolute clock class, "
+                       BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                               "Expecting an absolute clock class, "
                                "but got a non-absolute one: "
                                "clock-class-addr=%p, clock-class-name=\"%s\"",
                                clock_class, cc_name);
@@ -655,7 +676,8 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                break;
        case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NOT_ABS_NO_UUID:
                if (bt_clock_class_origin_is_unix_epoch(clock_class)) {
-                       BT_COMP_LOGE("Expecting a non-absolute clock class with no UUID, "
+                       BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                               "Expecting a non-absolute clock class with no UUID, "
                                "but got an absolute one: "
                                "clock-class-addr=%p, clock-class-name=\"%s\"",
                                clock_class, cc_name);
@@ -663,7 +685,8 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                }
 
                if (cc_uuid) {
-                       BT_COMP_LOGE("Expecting a non-absolute clock class with no UUID, "
+                       BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                               "Expecting a non-absolute clock class with no UUID, "
                                "but got one with a UUID: "
                                "clock-class-addr=%p, clock-class-name=\"%s\", "
                                "uuid=\"" BT_UUID_FMT "\"",
@@ -673,7 +696,8 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                break;
        case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NOT_ABS_SPEC_UUID:
                if (bt_clock_class_origin_is_unix_epoch(clock_class)) {
-                       BT_COMP_LOGE("Expecting a non-absolute clock class with a specific UUID, "
+                       BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                               "Expecting a non-absolute clock class with a specific UUID, "
                                "but got an absolute one: "
                                "clock-class-addr=%p, clock-class-name=\"%s\"",
                                clock_class, cc_name);
@@ -681,7 +705,8 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                }
 
                if (!cc_uuid) {
-                       BT_COMP_LOGE("Expecting a non-absolute clock class with a specific UUID, "
+                       BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                               "Expecting a non-absolute clock class with a specific UUID, "
                                "but got one with no UUID: "
                                "clock-class-addr=%p, clock-class-name=\"%s\"",
                                clock_class, cc_name);
@@ -689,7 +714,8 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                }
 
                if (bt_uuid_compare(muxer_msg_iter->expected_clock_class_uuid, cc_uuid) != 0) {
-                       BT_COMP_LOGE("Expecting a non-absolute clock class with a specific UUID, "
+                       BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                               "Expecting a non-absolute clock class with a specific UUID, "
                                "but got one with different UUID: "
                                "clock-class-addr=%p, clock-class-name=\"%s\", "
                                "expected-uuid=\"" BT_UUID_FMT "\", "
@@ -701,7 +727,8 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                }
                break;
        case MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NONE:
-               BT_COMP_LOGE("Expecting no clock class, but got one: "
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Expecting no clock class, but got one: "
                        "clock-class-addr=%p, clock-class-name=\"%s\"",
                        clock_class, cc_name);
                goto error;
@@ -710,7 +737,7 @@ int validate_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                BT_COMP_LOGF("Unexpected clock class expectation: "
                        "expectation-code=%d",
                        muxer_msg_iter->clock_class_expectation);
-               abort();
+               bt_common_abort();
        }
 
        goto end;
@@ -740,7 +767,8 @@ int validate_new_stream_clock_class(struct muxer_msg_iter *muxer_msg_iter,
                                MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NONE;
                } else if (muxer_msg_iter->clock_class_expectation !=
                                MUXER_MSG_ITER_CLOCK_CLASS_EXPECTATION_NONE) {
-                       BT_COMP_LOGE("Expecting stream class without a default clock class: "
+                       BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                               "Expecting stream class without a default clock class: "
                                "stream-class-addr=%p, stream-class-name=\"%s\", "
                                "stream-class-id=%" PRIu64,
                                stream_class, bt_stream_class_get_name(stream_class),
@@ -774,7 +802,7 @@ end:
  * the youngest, and sets *ts_ns to its time.
  */
 static
-bt_component_class_message_iterator_next_method_status
+bt_message_iterator_class_next_method_status
 muxer_msg_iter_youngest_upstream_msg_iter(
                struct muxer_comp *muxer_comp,
                struct muxer_msg_iter *muxer_msg_iter,
@@ -784,12 +812,12 @@ muxer_msg_iter_youngest_upstream_msg_iter(
        size_t i;
        int ret;
        int64_t youngest_ts_ns = INT64_MAX;
-       bt_component_class_message_iterator_next_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+       bt_message_iterator_class_next_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
 
-       BT_ASSERT(muxer_comp);
-       BT_ASSERT(muxer_msg_iter);
-       BT_ASSERT(muxer_upstream_msg_iter);
+       BT_ASSERT_DBG(muxer_comp);
+       BT_ASSERT_DBG(muxer_msg_iter);
+       BT_ASSERT_DBG(muxer_upstream_msg_iter);
        *muxer_upstream_msg_iter = NULL;
 
        for (i = 0; i < muxer_msg_iter->active_muxer_upstream_msg_iters->len;
@@ -809,9 +837,11 @@ muxer_msg_iter_youngest_upstream_msg_iter(
                        continue;
                }
 
-               BT_ASSERT(cur_muxer_upstream_msg_iter->msgs->length > 0);
-               msg = g_queue_peek_head(cur_muxer_upstream_msg_iter->msgs);
-               BT_ASSERT(msg);
+               BT_ASSERT_DBG(cur_muxer_upstream_msg_iter->next_msg <
+                       cur_muxer_upstream_msg_iter->msgs->len);
+               msg = g_ptr_array_index(cur_muxer_upstream_msg_iter->msgs,
+                       cur_muxer_upstream_msg_iter->next_msg);
+               BT_ASSERT_DBG(msg);
 
                if (G_UNLIKELY(bt_message_get_type(msg) ==
                                BT_MESSAGE_TYPE_STREAM_BEGINNING)) {
@@ -824,20 +854,20 @@ muxer_msg_iter_youngest_upstream_msg_iter(
                                 * validate_new_stream_clock_class() logs
                                 * errors.
                                 */
-                               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
+                               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                                goto end;
                        }
                } else if (G_UNLIKELY(bt_message_get_type(msg) ==
                                BT_MESSAGE_TYPE_MESSAGE_ITERATOR_INACTIVITY)) {
                        const bt_clock_snapshot *cs;
 
-                       cs = bt_message_message_iterator_inactivity_borrow_default_clock_snapshot_const(
+                       cs = bt_message_message_iterator_inactivity_borrow_clock_snapshot_const(
                                msg);
                        ret = validate_clock_class(muxer_msg_iter, muxer_comp,
                                bt_clock_snapshot_borrow_clock_class_const(cs));
                        if (ret) {
                                /* validate_clock_class() logs errors */
-                               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
+                               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                                goto end;
                        }
                }
@@ -847,7 +877,7 @@ muxer_msg_iter_youngest_upstream_msg_iter(
                if (ret) {
                        /* get_msg_ts_ns() logs errors */
                        *muxer_upstream_msg_iter = NULL;
-                       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
+                       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                        goto end;
                }
 
@@ -869,8 +899,11 @@ muxer_msg_iter_youngest_upstream_msg_iter(
                         * current candidate message. We must break the tie
                         * in a predictable manner.
                         */
-                       const bt_message *selected_msg = g_queue_peek_head(
-                               (*muxer_upstream_msg_iter)->msgs);
+                       BT_ASSERT_DBG((*muxer_upstream_msg_iter)->next_msg <
+                               (*muxer_upstream_msg_iter)->msgs->len);
+                       const bt_message *selected_msg =
+                               g_ptr_array_index((*muxer_upstream_msg_iter)->msgs,
+                                       (*muxer_upstream_msg_iter)->next_msg);
                        BT_COMP_LOGD_STR("Two of the next message candidates have the same timestamps, pick one deterministically.");
 
                        /*
@@ -899,7 +932,7 @@ muxer_msg_iter_youngest_upstream_msg_iter(
        }
 
        if (!*muxer_upstream_msg_iter) {
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END;
                *ts_ns = INT64_MIN;
        }
 
@@ -908,26 +941,26 @@ end:
 }
 
 static
-bt_component_class_message_iterator_next_method_status
+bt_message_iterator_class_next_method_status
 validate_muxer_upstream_msg_iter(
        struct muxer_upstream_msg_iter *muxer_upstream_msg_iter,
        bool *is_ended)
 {
-       struct muxer_comp *muxer_comp =
-               muxer_upstream_msg_iter->muxer_comp;
-       bt_component_class_message_iterator_next_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+       struct muxer_comp *muxer_comp = muxer_upstream_msg_iter->muxer_comp;
+       bt_message_iterator_class_next_method_status status;
 
        BT_COMP_LOGD("Validating muxer's upstream message iterator wrapper: "
                "muxer-upstream-msg-iter-wrap-addr=%p",
                muxer_upstream_msg_iter);
 
-       if (muxer_upstream_msg_iter->msgs->length > 0 ||
+       if (muxer_upstream_msg_iter->next_msg < muxer_upstream_msg_iter->msgs->len ||
                        !muxer_upstream_msg_iter->msg_iter) {
                BT_COMP_LOGD("Already valid or not considered: "
-                       "queue-len=%u, upstream-msg-iter-addr=%p",
-                       muxer_upstream_msg_iter->msgs->length,
+                       "queue-len=%u, next-msg=%u, upstream-msg-iter-addr=%p",
+                       muxer_upstream_msg_iter->msgs->len,
+                       muxer_upstream_msg_iter->next_msg,
                        muxer_upstream_msg_iter->msg_iter);
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
                goto end;
        }
 
@@ -940,13 +973,12 @@ end:
 }
 
 static
-bt_component_class_message_iterator_next_method_status
+bt_message_iterator_class_next_method_status
 validate_muxer_upstream_msg_iters(
                struct muxer_msg_iter *muxer_msg_iter)
 {
        struct muxer_comp *muxer_comp = muxer_msg_iter->muxer_comp;
-       bt_component_class_message_iterator_next_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+       bt_message_iterator_class_next_method_status status;
        size_t i;
 
        BT_COMP_LOGD("Validating muxer's upstream message iterator wrappers: "
@@ -962,9 +994,10 @@ validate_muxer_upstream_msg_iters(
 
                status = validate_muxer_upstream_msg_iter(
                        muxer_upstream_msg_iter, &is_ended);
-               if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+               if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                        if (status < 0) {
-                               BT_COMP_LOGE("Cannot validate muxer's upstream message iterator wrapper: "
+                               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                                       "Cannot validate muxer's upstream message iterator wrapper: "
                                        "muxer-msg-iter-addr=%p, "
                                        "muxer-upstream-msg-iter-wrap-addr=%p",
                                        muxer_msg_iter,
@@ -1005,22 +1038,25 @@ validate_muxer_upstream_msg_iters(
                }
        }
 
+       status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
+
 end:
        return status;
 }
 
 static inline
-bt_component_class_message_iterator_next_method_status muxer_msg_iter_do_next_one(
+bt_message_iterator_class_next_method_status muxer_msg_iter_do_next_one(
                struct muxer_comp *muxer_comp,
                struct muxer_msg_iter *muxer_msg_iter,
                const bt_message **msg)
 {
-       bt_component_class_message_iterator_next_method_status status;
+       bt_message_iterator_class_next_method_status status;
        struct muxer_upstream_msg_iter *muxer_upstream_msg_iter = NULL;
-       int64_t next_return_ts;
+       /* Initialize to avoid -Wmaybe-uninitialized warning with gcc 4.8. */
+       int64_t next_return_ts = 0;
 
        status = validate_muxer_upstream_msg_iters(muxer_msg_iter);
-       if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+       if (status != BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                /* validate_muxer_upstream_msg_iters() logs details */
                goto end;
        }
@@ -1034,9 +1070,10 @@ bt_component_class_message_iterator_next_method_status muxer_msg_iter_do_next_on
        status = muxer_msg_iter_youngest_upstream_msg_iter(muxer_comp,
                        muxer_msg_iter, &muxer_upstream_msg_iter,
                        &next_return_ts);
-       if (status < 0 || status == BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_END) {
+       if (status < 0 || status == BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_END) {
                if (status < 0) {
-                       BT_COMP_LOGE("Cannot find the youngest upstream message iterator wrapper: "
+                       BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                               "Cannot find the youngest upstream message iterator wrapper: "
                                "status=%s",
                                bt_common_func_status_string(status));
                } else {
@@ -1049,12 +1086,13 @@ bt_component_class_message_iterator_next_method_status muxer_msg_iter_do_next_on
        }
 
        if (next_return_ts < muxer_msg_iter->last_returned_ts_ns) {
-               BT_COMP_LOGE("Youngest upstream message iterator wrapper's timestamp is less than muxer's message iterator's last returned timestamp: "
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Youngest upstream message iterator wrapper's timestamp is less than muxer's message iterator's last returned timestamp: "
                        "muxer-msg-iter-addr=%p, ts=%" PRId64 ", "
                        "last-returned-ts=%" PRId64,
                        muxer_msg_iter, next_return_ts,
                        muxer_msg_iter->last_returned_ts_ns);
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_ERROR;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_ERROR;
                goto end;
        }
 
@@ -1063,15 +1101,20 @@ bt_component_class_message_iterator_next_method_status muxer_msg_iter_do_next_on
                "muxer-upstream-msg-iter-wrap-addr=%p, "
                "ts=%" PRId64,
                muxer_msg_iter, muxer_upstream_msg_iter, next_return_ts);
-       BT_ASSERT(status == BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK);
-       BT_ASSERT(muxer_upstream_msg_iter);
+       BT_ASSERT_DBG(status ==
+               BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK);
+       BT_ASSERT_DBG(muxer_upstream_msg_iter);
 
        /*
         * Consume from the queue's head: other side
         * (muxer_upstream_msg_iter_next()) writes to the tail.
         */
-       *msg = g_queue_pop_head(muxer_upstream_msg_iter->msgs);
-       BT_ASSERT(*msg);
+       *msg = g_ptr_array_index(muxer_upstream_msg_iter->msgs,
+               muxer_upstream_msg_iter->next_msg);
+       g_ptr_array_index(muxer_upstream_msg_iter->msgs,
+               muxer_upstream_msg_iter->next_msg) = NULL;
+       ++muxer_upstream_msg_iter->next_msg;
+       BT_ASSERT_DBG(*msg);
        muxer_msg_iter->last_returned_ts_ns = next_return_ts;
 
 end:
@@ -1079,23 +1122,33 @@ end:
 }
 
 static
-bt_component_class_message_iterator_next_method_status muxer_msg_iter_do_next(
+bt_message_iterator_class_next_method_status muxer_msg_iter_do_next(
                struct muxer_comp *muxer_comp,
                struct muxer_msg_iter *muxer_msg_iter,
                bt_message_array_const msgs, uint64_t capacity,
                uint64_t *count)
 {
-       bt_component_class_message_iterator_next_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+       bt_message_iterator_class_next_method_status status;
        uint64_t i = 0;
 
-       while (i < capacity && status == BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+       if (G_UNLIKELY(muxer_msg_iter->next_saved_error)) {
+               /*
+                * Last time we were called, we hit an error but had some
+                * messages to deliver, so we stashed the error here.  Return
+                * it now.
+                */
+               BT_CURRENT_THREAD_MOVE_ERROR_AND_RESET(muxer_msg_iter->next_saved_error);
+               status = muxer_msg_iter->next_saved_status;
+               goto end;
+       }
+
+       do {
                status = muxer_msg_iter_do_next_one(muxer_comp,
                        muxer_msg_iter, &msgs[i]);
-               if (status == BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK) {
+               if (status == BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK) {
                        i++;
                }
-       }
+       } while (i < capacity && status == BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK);
 
        if (i > 0) {
                /*
@@ -1110,10 +1163,23 @@ bt_component_class_message_iterator_next_method_status muxer_msg_iter_do_next(
                 * called, possibly without any accumulated
                 * message, in which case we'll return it.
                 */
+               if (status < 0) {
+                       /*
+                        * Save this error for the next _next call.  Assume that
+                        * this component always appends error causes when
+                        * returning an error status code, which will cause the
+                        * current thread error to be non-NULL.
+                        */
+                       muxer_msg_iter->next_saved_error = bt_current_thread_take_error();
+                       BT_ASSERT(muxer_msg_iter->next_saved_error);
+                       muxer_msg_iter->next_saved_status = status;
+               }
+
                *count = i;
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK;
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
        }
 
+end:
        return status;
 }
 
@@ -1146,13 +1212,15 @@ void destroy_muxer_msg_iter(struct muxer_msg_iter *muxer_msg_iter)
 }
 
 static
-bt_component_class_message_iterator_init_method_status
+bt_message_iterator_class_initialize_method_status
 muxer_msg_iter_init_upstream_iterators(struct muxer_comp *muxer_comp,
-               struct muxer_msg_iter *muxer_msg_iter)
+               struct muxer_msg_iter *muxer_msg_iter,
+               struct bt_self_message_iterator_configuration *config)
 {
        int64_t count;
        int64_t i;
-       bt_component_class_message_iterator_init_method_status status;
+       bt_message_iterator_class_initialize_method_status status;
+       bool can_seek_forward = true;
 
        count = bt_component_filter_get_input_port_count(
                bt_self_component_filter_as_component_filter(
@@ -1161,17 +1229,17 @@ muxer_msg_iter_init_upstream_iterators(struct muxer_comp *muxer_comp,
                BT_COMP_LOGD("No input port to initialize for muxer component's message iterator: "
                        "muxer-comp-addr=%p, muxer-msg-iter-addr=%p",
                        muxer_comp, muxer_msg_iter);
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_OK;
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_OK;
                goto end;
        }
 
        for (i = 0; i < count; i++) {
-               bt_self_component_port_input_message_iterator *upstream_msg_iter;
+               bt_message_iterator *upstream_msg_iter;
                bt_self_component_port_input *self_port =
                        bt_self_component_filter_borrow_input_port_by_index(
                                muxer_comp->self_comp_flt, i);
                const bt_port *port;
-               bt_self_component_port_input_message_iterator_create_from_message_iterator_status
+               bt_message_iterator_create_from_message_iterator_status
                        msg_iter_status;
                int int_status;
 
@@ -1188,7 +1256,7 @@ muxer_msg_iter_init_upstream_iterators(struct muxer_comp *muxer_comp,
 
                msg_iter_status = create_msg_iter_on_input_port(muxer_comp,
                        muxer_msg_iter, self_port, &upstream_msg_iter);
-               if (msg_iter_status != BT_SELF_COMPONENT_PORT_INPUT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK) {
+               if (msg_iter_status != BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK) {
                        /* create_msg_iter_on_input_port() logs errors */
                        status = (int) msg_iter_status;
                        goto end;
@@ -1196,33 +1264,45 @@ muxer_msg_iter_init_upstream_iterators(struct muxer_comp *muxer_comp,
 
                int_status = muxer_msg_iter_add_upstream_msg_iter(muxer_msg_iter,
                        upstream_msg_iter);
-               bt_self_component_port_input_message_iterator_put_ref(
+               bt_message_iterator_put_ref(
                        upstream_msg_iter);
                if (int_status) {
-                       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_ERROR;
+                       status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
                        /* muxer_msg_iter_add_upstream_msg_iter() logs errors */
                        goto end;
                }
+
+               can_seek_forward = can_seek_forward &&
+                       bt_message_iterator_can_seek_forward(
+                               upstream_msg_iter);
        }
 
-       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_OK;
+       /*
+        * This iterator can seek forward if all of its iterators can seek
+        * forward.
+        */
+       bt_self_message_iterator_configuration_set_can_seek_forward(
+               config, can_seek_forward);
+
+       status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_OK;
 
 end:
        return status;
 }
 
 BT_HIDDEN
-bt_component_class_message_iterator_init_method_status muxer_msg_iter_init(
+bt_message_iterator_class_initialize_method_status muxer_msg_iter_init(
                bt_self_message_iterator *self_msg_iter,
-               bt_self_component_filter *self_comp,
+               bt_self_message_iterator_configuration *config,
                bt_self_component_port_output *port)
 {
        struct muxer_comp *muxer_comp = NULL;
        struct muxer_msg_iter *muxer_msg_iter = NULL;
-       bt_component_class_message_iterator_init_method_status status;
+       bt_message_iterator_class_initialize_method_status status;
+       bt_self_component *self_comp =
+               bt_self_message_iterator_borrow_component(self_msg_iter);
 
-       muxer_comp = bt_self_component_get_data(
-               bt_self_component_filter_as_self_component(self_comp));
+       muxer_comp = bt_self_component_get_data(self_comp);
        BT_ASSERT(muxer_comp);
        BT_COMP_LOGD("Initializing muxer component's message iterator: "
                "comp-addr=%p, muxer-comp-addr=%p, msg-iter-addr=%p",
@@ -1234,18 +1314,20 @@ bt_component_class_message_iterator_init_method_status muxer_msg_iter_init(
                 * creates a muxer message iterator while creating
                 * another muxer message iterator (same component).
                 */
-               BT_COMP_LOGE("Recursive initialization of muxer component's message iterator: "
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Recursive initialization of muxer component's message iterator: "
                        "comp-addr=%p, muxer-comp-addr=%p, msg-iter-addr=%p",
                        self_comp, muxer_comp, self_msg_iter);
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_ERROR;
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
                goto error;
        }
 
        muxer_comp->initializing_muxer_msg_iter = true;
        muxer_msg_iter = g_new0(struct muxer_msg_iter, 1);
        if (!muxer_msg_iter) {
-               BT_COMP_LOGE_STR("Failed to allocate one muxer component's message iterator.");
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_MEMORY_ERROR;
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Failed to allocate one muxer component's message iterator.");
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
@@ -1256,8 +1338,8 @@ bt_component_class_message_iterator_init_method_status muxer_msg_iter_init(
                g_ptr_array_new_with_free_func(
                        (GDestroyNotify) destroy_muxer_upstream_msg_iter);
        if (!muxer_msg_iter->active_muxer_upstream_msg_iters) {
-               BT_COMP_LOGE_STR("Failed to allocate a GPtrArray.");
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_MEMORY_ERROR;
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp, "Failed to allocate a GPtrArray.");
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
@@ -1265,15 +1347,16 @@ bt_component_class_message_iterator_init_method_status muxer_msg_iter_init(
                g_ptr_array_new_with_free_func(
                        (GDestroyNotify) destroy_muxer_upstream_msg_iter);
        if (!muxer_msg_iter->ended_muxer_upstream_msg_iters) {
-               BT_COMP_LOGE_STR("Failed to allocate a GPtrArray.");
-               status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INIT_METHOD_STATUS_MEMORY_ERROR;
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp, "Failed to allocate a GPtrArray.");
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
        status = muxer_msg_iter_init_upstream_iterators(muxer_comp,
-               muxer_msg_iter);
+               muxer_msg_iter, config);
        if (status) {
-               BT_COMP_LOGE("Cannot initialize connected input ports for muxer component's message iterator: "
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Cannot initialize connected input ports for muxer component's message iterator: "
                        "comp-addr=%p, muxer-comp-addr=%p, "
                        "muxer-msg-iter-addr=%p, msg-iter-addr=%p, ret=%d",
                        self_comp, muxer_comp, muxer_msg_iter,
@@ -1320,23 +1403,23 @@ void muxer_msg_iter_finalize(bt_self_message_iterator *self_msg_iter)
 }
 
 BT_HIDDEN
-bt_component_class_message_iterator_next_method_status muxer_msg_iter_next(
+bt_message_iterator_class_next_method_status muxer_msg_iter_next(
                bt_self_message_iterator *self_msg_iter,
                bt_message_array_const msgs, uint64_t capacity,
                uint64_t *count)
 {
-       bt_component_class_message_iterator_next_method_status status;
+       bt_message_iterator_class_next_method_status status;
        struct muxer_msg_iter *muxer_msg_iter =
                bt_self_message_iterator_get_data(self_msg_iter);
        bt_self_component *self_comp = NULL;
        struct muxer_comp *muxer_comp = NULL;
 
-       BT_ASSERT(muxer_msg_iter);
+       BT_ASSERT_DBG(muxer_msg_iter);
        self_comp = bt_self_message_iterator_borrow_component(
                self_msg_iter);
-       BT_ASSERT(self_comp);
+       BT_ASSERT_DBG(self_comp);
        muxer_comp = bt_self_component_get_data(self_comp);
-       BT_ASSERT(muxer_comp);
+       BT_ASSERT_DBG(muxer_comp);
        BT_COMP_LOGT("Muxer component's message iterator's \"next\" method called: "
                "comp-addr=%p, muxer-comp-addr=%p, muxer-msg-iter-addr=%p, "
                "msg-iter-addr=%p",
@@ -1345,7 +1428,8 @@ bt_component_class_message_iterator_next_method_status muxer_msg_iter_next(
        status = muxer_msg_iter_do_next(muxer_comp, muxer_msg_iter,
                msgs, capacity, count);
        if (status < 0) {
-               BT_COMP_LOGE("Cannot get next message: "
+               BT_COMP_LOGE_APPEND_CAUSE(self_comp,
+                       "Cannot get next message: "
                        "comp-addr=%p, muxer-comp-addr=%p, muxer-msg-iter-addr=%p, "
                        "msg-iter-addr=%p, status=%s",
                        self_comp, muxer_comp, muxer_msg_iter, self_msg_iter,
@@ -1373,9 +1457,9 @@ bt_component_class_port_connected_method_status muxer_input_port_connected(
 
        add_port_status = add_available_input_port(self_comp);
        if (add_port_status) {
-               BT_COMP_LOGE("Cannot add one muxer component's input port: "
-                       "status=%s",
-                       bt_common_func_status_string(status));
+               BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                       "Cannot add one muxer component's input port: status=%s",
+                       bt_common_func_status_string(add_port_status));
 
                if (add_port_status ==
                                BT_SELF_COMPONENT_ADD_PORT_STATUS_MEMORY_ERROR) {
@@ -1392,20 +1476,24 @@ end:
 }
 
 static inline
-bt_component_class_message_iterator_can_seek_beginning_method_status
+bt_message_iterator_class_can_seek_beginning_method_status
 muxer_upstream_msg_iters_can_all_seek_beginning(
+               struct muxer_comp *muxer_comp,
                GPtrArray *muxer_upstream_msg_iters, bt_bool *can_seek)
 {
-       bt_component_class_message_iterator_can_seek_beginning_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_CAN_SEEK_BEGINNING_METHOD_STATUS_OK;
+       bt_message_iterator_class_can_seek_beginning_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_CAN_SEEK_BEGINNING_METHOD_STATUS_OK;
        uint64_t i;
 
        for (i = 0; i < muxer_upstream_msg_iters->len; i++) {
                struct muxer_upstream_msg_iter *upstream_msg_iter =
                        muxer_upstream_msg_iters->pdata[i];
-               status = (int) bt_self_component_port_input_message_iterator_can_seek_beginning(
+               status = (int) bt_message_iterator_can_seek_beginning(
                        upstream_msg_iter->msg_iter, can_seek);
-               if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_CAN_SEEK_BEGINNING_METHOD_STATUS_OK) {
+               if (status != BT_MESSAGE_ITERATOR_CLASS_CAN_SEEK_BEGINNING_METHOD_STATUS_OK) {
+                       BT_COMP_LOGE_APPEND_CAUSE(muxer_comp->self_comp,
+                               "Failed to determine whether upstream message iterator can seek beginning: "
+                               "msg-iter-addr=%p", upstream_msg_iter->msg_iter);
                        goto end;
                }
 
@@ -1421,17 +1509,18 @@ end:
 }
 
 BT_HIDDEN
-bt_component_class_message_iterator_can_seek_beginning_method_status
+bt_message_iterator_class_can_seek_beginning_method_status
 muxer_msg_iter_can_seek_beginning(
                bt_self_message_iterator *self_msg_iter, bt_bool *can_seek)
 {
        struct muxer_msg_iter *muxer_msg_iter =
                bt_self_message_iterator_get_data(self_msg_iter);
-       bt_component_class_message_iterator_can_seek_beginning_method_status status;
+       bt_message_iterator_class_can_seek_beginning_method_status status;
 
        status = muxer_upstream_msg_iters_can_all_seek_beginning(
+               muxer_msg_iter->muxer_comp,
                muxer_msg_iter->active_muxer_upstream_msg_iters, can_seek);
-       if (status != BT_COMPONENT_CLASS_MESSAGE_ITERATOR_CAN_SEEK_BEGINNING_METHOD_STATUS_OK) {
+       if (status != BT_MESSAGE_ITERATOR_CLASS_CAN_SEEK_BEGINNING_METHOD_STATUS_OK) {
                goto end;
        }
 
@@ -1440,6 +1529,7 @@ muxer_msg_iter_can_seek_beginning(
        }
 
        status = muxer_upstream_msg_iters_can_all_seek_beginning(
+               muxer_msg_iter->muxer_comp,
                muxer_msg_iter->ended_muxer_upstream_msg_iters, can_seek);
 
 end:
@@ -1447,13 +1537,13 @@ end:
 }
 
 BT_HIDDEN
-bt_component_class_message_iterator_seek_beginning_method_status muxer_msg_iter_seek_beginning(
+bt_message_iterator_class_seek_beginning_method_status muxer_msg_iter_seek_beginning(
                bt_self_message_iterator *self_msg_iter)
 {
        struct muxer_msg_iter *muxer_msg_iter =
                bt_self_message_iterator_get_data(self_msg_iter);
-       bt_component_class_message_iterator_seek_beginning_method_status status =
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_SEEK_BEGINNING_METHOD_STATUS_OK;
+       bt_message_iterator_class_seek_beginning_method_status status =
+               BT_MESSAGE_ITERATOR_CLASS_SEEK_BEGINNING_METHOD_STATUS_OK;
        bt_message_iterator_seek_beginning_status seek_beg_status;
        uint64_t i;
 
@@ -1463,7 +1553,7 @@ bt_component_class_message_iterator_seek_beginning_method_status muxer_msg_iter_
                struct muxer_upstream_msg_iter *upstream_msg_iter =
                        muxer_msg_iter->ended_muxer_upstream_msg_iters->pdata[i];
 
-               seek_beg_status = bt_self_component_port_input_message_iterator_seek_beginning(
+               seek_beg_status = bt_message_iterator_seek_beginning(
                        upstream_msg_iter->msg_iter);
                if (seek_beg_status != BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_OK) {
                        status = (int) seek_beg_status;
@@ -1479,7 +1569,7 @@ bt_component_class_message_iterator_seek_beginning_method_status muxer_msg_iter_
                struct muxer_upstream_msg_iter *upstream_msg_iter =
                        muxer_msg_iter->active_muxer_upstream_msg_iters->pdata[i];
 
-               seek_beg_status = bt_self_component_port_input_message_iterator_seek_beginning(
+               seek_beg_status = bt_message_iterator_seek_beginning(
                        upstream_msg_iter->msg_iter);
                if (seek_beg_status != BT_MESSAGE_ITERATOR_SEEK_BEGINNING_STATUS_OK) {
                        status = (int) seek_beg_status;
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