Implement Java agent application context retrieval

[deliverable/lttng-ust.git] / liblttng-ust-java-agent / jni / jul / lttng_ust_jul.c

/*
 * Copyright (C) 2016 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; only
 * version 2.1 of the License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "org_lttng_ust_agent_jul_LttngJulApi.h"

#define TRACEPOINT_DEFINE
#define TRACEPOINT_CREATE_PROBES
#include "lttng_ust_jul.h"
#include "../common/lttng_ust_context.h"

/*
 * Deprecated function from before the context information was passed.
 */
JNIEXPORT void JNICALL Java_org_lttng_ust_agent_jul_LttngJulApi_tracepoint(JNIEnv *env,
						jobject jobj,
						jstring msg,
						jstring logger_name,
						jstring class_name,
						jstring method_name,
						jlong millis,
						jint log_level,
						jint thread_id)
{
	jboolean iscopy;
	const char *msg_cstr = (*env)->GetStringUTFChars(env, msg, &iscopy);
	const char *logger_name_cstr = (*env)->GetStringUTFChars(env, logger_name, &iscopy);
	const char *class_name_cstr = (*env)->GetStringUTFChars(env, class_name, &iscopy);
	const char *method_name_cstr = (*env)->GetStringUTFChars(env, method_name, &iscopy);

	tracepoint(lttng_jul, event, msg_cstr, logger_name_cstr,
			class_name_cstr, method_name_cstr, millis, log_level, thread_id);

	(*env)->ReleaseStringUTFChars(env, msg, msg_cstr);
	(*env)->ReleaseStringUTFChars(env, logger_name, logger_name_cstr);
	(*env)->ReleaseStringUTFChars(env, class_name, class_name_cstr);
	(*env)->ReleaseStringUTFChars(env, method_name, method_name_cstr);
}

/*
 * Tracepoint used by Java applications using the JUL handler.
 */
JNIEXPORT void JNICALL Java_org_lttng_ust_agent_jul_LttngJulApi_tracepointWithContext(JNIEnv *env,
						jobject jobj,
						jstring msg,
						jstring logger_name,
						jstring class_name,
						jstring method_name,
						jlong millis,
						jint log_level,
						jint thread_id,
						jbyteArray context_info)
{
	jboolean iscopy;
	const char *msg_cstr = (*env)->GetStringUTFChars(env, msg, &iscopy);
	const char *logger_name_cstr = (*env)->GetStringUTFChars(env, logger_name, &iscopy);
	const char *class_name_cstr = (*env)->GetStringUTFChars(env, class_name, &iscopy);
	const char *method_name_cstr = (*env)->GetStringUTFChars(env, method_name, &iscopy);
	signed char *context_info_array;

	/*
	 * Write these to the TLS variables, so that the UST callbacks in
	 * lttng_ust_context.c can access them.
	 */
	context_info_array = (*env)->GetByteArrayElements(env, context_info, &iscopy);
	lttng_ust_context_info_tls.ctx = (struct lttng_ust_jni_ctx *) context_info_array;
	lttng_ust_context_info_tls.len = (*env)->GetArrayLength(env, context_info);

	tracepoint(lttng_jul, event, msg_cstr, logger_name_cstr,
			class_name_cstr, method_name_cstr, millis, log_level, thread_id);

	lttng_ust_context_info_tls.ctx = NULL;
	lttng_ust_context_info_tls.len = 0;
	(*env)->ReleaseStringUTFChars(env, msg, msg_cstr);
	(*env)->ReleaseStringUTFChars(env, logger_name, logger_name_cstr);
	(*env)->ReleaseStringUTFChars(env, class_name, class_name_cstr);
	(*env)->ReleaseStringUTFChars(env, method_name, method_name_cstr);
	(*env)->ReleaseByteArrayElements(env, context_info, context_info_array, 0);
}