[lttng-dev] [UST PATCH] Build a jar for the Java side of the JNI interface

[Mathieu Desnoyers]

* Alexandre Montplaisir (alexandre.montplaisir at polymtl.ca) wrote:
> On 12-04-11 06:50 PM, Mathieu Desnoyers wrote:
> > With this, is the java application visible from lttng-tools before the
> > first JNI call is done ?
> 
> No, not yet. This patch only adds the makefile target.
> 
> I'm still experimenting with the contents of .java file (namely, adding
> support for other tracepoints types). Something like "LTTngUst.init()"
> will be needed eventually, since Java classes are lazy-loaded. This
> init() can also serve as a check for the liblttng-ust-java.so library,
> which will avoid blowing up the application if that library is not found
> at runtime.

OK. So I'll pull your patch and expect the fix for init call.

Thanks,

Mathieu

> 
> 
> -- 
> Alexandre Montplaisir
> DORSAL lab,
> École Polytechnique de Montréal
> 
> 
> >
> > * Alexandre Montplaisir (alexandre.montplaisir at polymtl.ca) wrote:
> >> Signed-off-by: Alexandre Montplaisir <alexandre.montplaisir at polymtl.ca>
> >> ---
> >>  liblttng-ust-java/.gitignore    |    1 +
> >>  liblttng-ust-java/LTTngUst.java |    2 +-
> >>  liblttng-ust-java/Makefile.am   |    8 ++++++--
> >>  liblttng-ust-java/README        |    5 +++++
> >>  4 files changed, 13 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/liblttng-ust-java/.gitignore b/liblttng-ust-java/.gitignore
> >> index 677373e..e07ee50 100644
> >> --- a/liblttng-ust-java/.gitignore
> >> +++ b/liblttng-ust-java/.gitignore
> >> @@ -1,2 +1,3 @@
> >>  org_lttng_ust_LTTngUst.h
> >>  org/
> >> +liblttng-ust-java.jar
> >> diff --git a/liblttng-ust-java/LTTngUst.java b/liblttng-ust-java/LTTngUst.java
> >> index d3f1eda..68ed120 100644
> >> --- a/liblttng-ust-java/LTTngUst.java
> >> +++ b/liblttng-ust-java/LTTngUst.java
> >> @@ -18,7 +18,7 @@
> >>  
> >>  package org.lttng.ust;
> >>  
> >> -class LTTngUst {
> >> +public class LTTngUst {
> >>  	public static native void tracepointString(String name, String arg);
> >>  	static {
> >>  		System.loadLibrary("lttng-ust-java");
> >> diff --git a/liblttng-ust-java/Makefile.am b/liblttng-ust-java/Makefile.am
> >> index 9e01e04..7e1834a 100644
> >> --- a/liblttng-ust-java/Makefile.am
> >> +++ b/liblttng-ust-java/Makefile.am
> >> @@ -7,10 +7,11 @@ liblttng_ust_java_la_SOURCES = LTTngUst.c org_lttng_ust_LTTngUst.h lttng_ust_jav
> >>  dist_noinst_DATA = LTTngUst.java
> >>  liblttng_ust_java_la_LIBADD = -lc -L$(top_builddir)/liblttng-ust/.libs -llttng-ust
> >>  
> >> -all: LTTngUst.class org_lttng_ust_LTTngUst.h
> >> +all: LTTngUst.class org_lttng_ust_LTTngUst.h liblttng-ust-java.jar
> >>  
> >>  clean-local:
> >> -	rm  org_lttng_ust_LTTngUst.h
> >> +	rm org_lttng_ust_LTTngUst.h
> >> +	rm liblttng-ust-java.jar
> >>  	rm -rf org/
> >>  
> >>  LTTngUst.class: LTTngUst.java
> >> @@ -19,4 +20,7 @@ LTTngUst.class: LTTngUst.java
> >>  org_lttng_ust_LTTngUst.h: LTTngUst.class
> >>  	javah org.lttng.ust.LTTngUst
> >>  
> >> +liblttng-ust-java.jar: LTTngUst.class
> >> +	jar cf liblttng-ust-java.jar org/*
> >> +
> >>  endif
> >> diff --git a/liblttng-ust-java/README b/liblttng-ust-java/README
> >> index 37834e6..4b4d2c6 100644
> >> --- a/liblttng-ust-java/README
> >> +++ b/liblttng-ust-java/README
> >> @@ -10,3 +10,8 @@ dependency: openjdk-6-jdk
> >>  
> >>  dependency: gcj-4.4-jdk
> >>  ./configure --with-java-jdk=/usr/lib/jvm/java-gcj --with-jni-interface
> >> +
> >> +
> >> +After building, you can use the liblttng-ust-java.jar file in a Java project.
> >> +It requires the liblttng-ust-java.so* files (which get installed when doing
> >> +`make install') so make sure those are in the linker's library path.
> >> -- 
> >> 1.7.9.1
> >>
> >>
> >> _______________________________________________
> >> lttng-dev mailing list
> >> lttng-dev at lists.lttng.org
> >> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com