From: Alexandre Montplaisir Date: Tue, 22 May 2012 16:37:49 +0000 (-0400) Subject: Add Integer and Long tracepoint types to the Java interface X-Git-Tag: v2.1.0-rc1~82 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=14d1b9ce73cfcdfed42da32a13c984c54672cbd8;p=lttng-ust.git Add Integer and Long tracepoint types to the Java interface Also added Javadoc comments to the .java file. Signed-off-by: Alexandre Montplaisir Signed-off-by: Mathieu Desnoyers --- diff --git a/liblttng-ust-java/LTTngUst.c b/liblttng-ust-java/LTTngUst.c index 3d23d6a1..0bef89dd 100644 --- a/liblttng-ust-java/LTTngUst.c +++ b/liblttng-ust-java/LTTngUst.c @@ -22,18 +22,44 @@ #define TRACEPOINT_CREATE_PROBES #include "lttng_ust_java.h" +JNIEXPORT void JNICALL Java_org_lttng_ust_LTTngUst_tracepointInt(JNIEnv *env, + jobject jobj, + jstring ev_name, + jint payload) +{ + jboolean iscopy; + const char *ev_name_cstr = (*env)->GetStringUTFChars(env, ev_name, &iscopy); + + tracepoint(lttng_ust_java, int_event, ev_name_cstr, payload); + + (*env)->ReleaseStringUTFChars(env, ev_name, ev_name_cstr); +} + +JNIEXPORT void JNICALL Java_org_lttng_ust_LTTngUst_tracepointLong(JNIEnv *env, + jobject jobj, + jstring ev_name, + jlong payload) +{ + jboolean iscopy; + const char *ev_name_cstr = (*env)->GetStringUTFChars(env, ev_name, &iscopy); + + tracepoint(lttng_ust_java, long_event, ev_name_cstr, payload); + + (*env)->ReleaseStringUTFChars(env, ev_name, ev_name_cstr); +} + JNIEXPORT void JNICALL Java_org_lttng_ust_LTTngUst_tracepointString(JNIEnv *env, jobject jobj, jstring ev_name, - jstring args) + jstring payload) { jboolean iscopy; - const char *ev_name_cstr = (*env)->GetStringUTFChars(env, ev_name, - &iscopy); - const char *args_cstr = (*env)->GetStringUTFChars(env, args, &iscopy); + const char *ev_name_cstr = (*env)->GetStringUTFChars(env, ev_name, &iscopy); + const char *payload_cstr = (*env)->GetStringUTFChars(env, payload, &iscopy); - tracepoint(lttng_ust_java, string, ev_name_cstr, args_cstr); + tracepoint(lttng_ust_java, string_event, ev_name_cstr, payload_cstr); (*env)->ReleaseStringUTFChars(env, ev_name, ev_name_cstr); - (*env)->ReleaseStringUTFChars(env, args, args_cstr); + (*env)->ReleaseStringUTFChars(env, payload, payload_cstr); } + diff --git a/liblttng-ust-java/LTTngUst.java b/liblttng-ust-java/LTTngUst.java index 68ed120c..f4bea324 100644 --- a/liblttng-ust-java/LTTngUst.java +++ b/liblttng-ust-java/LTTngUst.java @@ -1,5 +1,6 @@ -/* +/** * Copyright (C) 2011-2012 Mathieu Desnoyers + * Copyright (C) 2012 Alexandre Montplaisir * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public @@ -18,10 +19,64 @@ package org.lttng.ust; -public class LTTngUst { - public static native void tracepointString(String name, String arg); - static { - System.loadLibrary("lttng-ust-java"); - } +/** + * This class implements the the Java side of the LTTng-UST Java interface. + * + * First, make sure you have installed "liblttng-ust-java.so" where the linker + * can find it. You can then call LTTngUst.init() from your Java program to + * connect the methods exposed here to the native library. + * + * Because of limitations in the probe declaration, all trace events generated + * by this library will have "lttng_ust_java" for domain, and "_event" for + * event name in the CTF trace files. The "name" parameter will instead appear + * as the first element of the event's payload. + * + * @author Mathieu Desnoyers + * @author Alexandre Montplaisir + * + */ +public abstract class LTTngUst { + + /** + * Initialize the UST tracer. This should always be called first, before any + * tracepoint* method. + */ + public static void init() { + System.loadLibrary("lttng-ust-java"); //$NON-NLS-1$ + } + + /** + * Insert a tracepoint with a payload of type Integer. + * + * @param name + * The name assigned to this event. For best performance, this + * should be a statically-defined String, or a literal. + * @param payload + * The int payload + */ + public static native void tracepointInt(String name, int payload); + + /** + * Insert a tracepoint with a payload of type Long + * + * @param name + * The name assigned to this event. For best performance, this + * should be a statically-defined String, or a literal. + * @param payload + * The long payload + */ + public static native void tracepointLong(String name, long payload); + + /** + * Insert a tracepoint with a String payload. + * + * @param name + * The name assigned to this event. For best performance, this + * should be a statically-defined String, or a literal. + * @param payload + * The String payload + */ + public static native void tracepointString(String name, String payload); + } diff --git a/liblttng-ust-java/lttng_ust_java.h b/liblttng-ust-java/lttng_ust_java.h index 771d3924..7cdbea57 100644 --- a/liblttng-ust-java/lttng_ust_java.h +++ b/liblttng-ust-java/lttng_ust_java.h @@ -24,11 +24,27 @@ #include -TRACEPOINT_EVENT(lttng_ust_java, string, - TP_ARGS(const char *, name, const char *, args), +TRACEPOINT_EVENT(lttng_ust_java, int_event, + TP_ARGS(const char *, name, int, payload), TP_FIELDS( ctf_string(name, name) - ctf_string(args, args) + ctf_integer(int, int_payload, payload) + ) +) + +TRACEPOINT_EVENT(lttng_ust_java, long_event, + TP_ARGS(const char *, name, long, payload), + TP_FIELDS( + ctf_string(name, name) + ctf_integer(long, long_payload, payload) + ) +) + +TRACEPOINT_EVENT(lttng_ust_java, string_event, + TP_ARGS(const char *, name, const char *, payload), + TP_FIELDS( + ctf_string(name, name) + ctf_string(string_payload, payload) ) )