Move to kernel style SPDX license identifiers
[babeltrace.git] / src / plugins / utils / muxer / muxer.c
index a2db3cb9ee398dd3e523a9d4d6dbc91cd042e5ab..182dc84d66d25ef781bee781020900040150282e 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:
+ * SPDX-License-Identifier: MIT
  *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * 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)
@@ -56,7 +40,7 @@ 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;
@@ -107,6 +91,14 @@ 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
@@ -135,7 +127,7 @@ void destroy_muxer_upstream_msg_iter(
                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(
+       bt_message_iterator_put_ref(
                muxer_upstream_msg_iter->msg_iter);
 
        if (muxer_upstream_msg_iter->msgs) {
@@ -148,7 +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 =
@@ -162,7 +154,7 @@ int muxer_msg_iter_add_upstream_msg_iter(struct muxer_msg_iter *muxer_msg_iter,
 
        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);
+       bt_message_iterator_get_ref(muxer_upstream_msg_iter->msg_iter);
        muxer_upstream_msg_iter->msgs = g_queue_new();
        if (!muxer_upstream_msg_iter->msgs) {
                BT_COMP_LOGE_STR("Failed to allocate a GQueue.");
@@ -247,6 +239,7 @@ 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
 };
@@ -342,16 +335,16 @@ 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);
@@ -360,9 +353,9 @@ 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) {
+       if (status != BT_MESSAGE_ITERATOR_CREATE_FROM_MESSAGE_ITERATOR_STATUS_OK) {
                BT_COMP_LOGE("Cannot create upstream message iterator on input port: "
                        "port-addr=%p, port-name=\"%s\"",
                        port, bt_port_get_name(port));
@@ -378,13 +371,12 @@ 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;
@@ -394,7 +386,7 @@ 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",
@@ -419,7 +411,7 @@ bt_component_class_message_iterator_next_method_status muxer_upstream_msg_iter_n
                        g_queue_push_tail(muxer_upstream_msg_iter->msgs,
                                (void *) 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:
                /*
@@ -427,7 +419,7 @@ 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. */
                /*
@@ -436,13 +428,22 @@ 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;
        }
 
@@ -563,7 +564,7 @@ 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:
@@ -778,7 +779,7 @@ 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,
@@ -788,8 +789,8 @@ 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_DBG(muxer_comp);
        BT_ASSERT_DBG(muxer_msg_iter);
@@ -828,20 +829,20 @@ 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;
                        }
                }
@@ -851,7 +852,7 @@ 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;
                }
 
@@ -903,7 +904,7 @@ 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;
        }
 
@@ -912,15 +913,13 @@ 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",
@@ -932,6 +931,7 @@ validate_muxer_upstream_msg_iter(
                        "queue-len=%u, upstream-msg-iter-addr=%p",
                        muxer_upstream_msg_iter->msgs->length,
                        muxer_upstream_msg_iter->msg_iter);
+               status = BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK;
                goto end;
        }
 
@@ -944,13 +944,12 @@ 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: "
@@ -966,9 +965,10 @@ 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,
@@ -1009,22 +1009,25 @@ 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;
        }
@@ -1038,9 +1041,10 @@ 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 {
@@ -1053,12 +1057,13 @@ 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;
        }
 
@@ -1068,7 +1073,7 @@ bt_component_class_message_iterator_next_method_status muxer_msg_iter_do_next_on
                "ts=%" PRId64,
                muxer_msg_iter, muxer_upstream_msg_iter, next_return_ts);
        BT_ASSERT_DBG(status ==
-               BT_COMPONENT_CLASS_MESSAGE_ITERATOR_NEXT_METHOD_STATUS_OK);
+               BT_MESSAGE_ITERATOR_CLASS_NEXT_METHOD_STATUS_OK);
        BT_ASSERT_DBG(muxer_upstream_msg_iter);
 
        /*
@@ -1084,23 +1089,33 @@ 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) {
                /*
@@ -1115,10 +1130,23 @@ 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;
 }
 
@@ -1151,14 +1179,14 @@ void destroy_muxer_msg_iter(struct muxer_msg_iter *muxer_msg_iter)
 }
 
 static
-bt_component_class_message_iterator_initialize_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 bt_self_message_iterator_configuration *config)
 {
        int64_t count;
        int64_t i;
-       bt_component_class_message_iterator_initialize_method_status status;
+       bt_message_iterator_class_initialize_method_status status;
        bool can_seek_forward = true;
 
        count = bt_component_filter_get_input_port_count(
@@ -1168,17 +1196,17 @@ 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_INITIALIZE_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;
 
@@ -1195,7 +1223,7 @@ 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;
@@ -1203,16 +1231,16 @@ 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_INITIALIZE_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_self_component_port_input_message_iterator_can_seek_forward(
+                       bt_message_iterator_can_seek_forward(
                                upstream_msg_iter);
        }
 
@@ -1223,25 +1251,25 @@ muxer_msg_iter_init_upstream_iterators(struct muxer_comp *muxer_comp,
        bt_self_message_iterator_configuration_set_can_seek_forward(
                config, can_seek_forward);
 
-       status = BT_COMPONENT_CLASS_MESSAGE_ITERATOR_INITIALIZE_METHOD_STATUS_OK;
+       status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_OK;
 
 end:
        return status;
 }
 
 BT_HIDDEN
-bt_component_class_message_iterator_initialize_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_message_iterator_configuration *config,
-               bt_self_component_filter *self_comp,
                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_initialize_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",
@@ -1256,7 +1284,7 @@ bt_component_class_message_iterator_initialize_method_status muxer_msg_iter_init
                BT_COMP_LOGE("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_INITIALIZE_METHOD_STATUS_ERROR;
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_ERROR;
                goto error;
        }
 
@@ -1264,7 +1292,7 @@ bt_component_class_message_iterator_initialize_method_status muxer_msg_iter_init
        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_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
@@ -1276,7 +1304,7 @@ bt_component_class_message_iterator_initialize_method_status muxer_msg_iter_init
                        (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_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
@@ -1285,7 +1313,7 @@ bt_component_class_message_iterator_initialize_method_status muxer_msg_iter_init
                        (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_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
+               status = BT_MESSAGE_ITERATOR_CLASS_INITIALIZE_METHOD_STATUS_MEMORY_ERROR;
                goto error;
        }
 
@@ -1339,12 +1367,12 @@ 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;
@@ -1411,20 +1439,20 @@ 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(
                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) {
                        goto end;
                }
 
@@ -1440,17 +1468,17 @@ 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->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;
        }
 
@@ -1466,13 +1494,13 @@ 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;
 
@@ -1482,7 +1510,7 @@ 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;
@@ -1498,7 +1526,7 @@ 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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