Add Java binding

9 files changed, 891 insertions, 3 deletions

diff --git a/Makefile.am b/Makefile.am
index 15424ff..3055e64 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -8,5 +8,9 @@ if BUILD_RUBY
 DIR_R = ruby
 endif
 
-SUBDIRS = src perf $(DIR_P) $(DIR_R)
-DIST_SUBDIRS = src perf $(DIR_P) $(DIR_R)
+if BUILD_JAVA
+DIR_J = java
+endif
+
+SUBDIRS = src perf $(DIR_P) $(DIR_R) $(DIR_J)
+DIST_SUBDIRS = src perf $(DIR_P) $(DIR_R) $(DIR_J)
diff --git a/configure.in b/configure.in
index d4e60c5..0cd28a5 100644
--- a/configure.in
+++ b/configure.in
@@ -259,7 +259,58 @@ if test "x$pyzmq" != "xyes"; then
         [python third-party/openpgm/libpgm-1.0.0/openpgm/pgm/version_generator.py > \
             third-party/openpgm/libpgm-1.0.0/openpgm/pgm/version.c])
 
+# Java language binding
+jzmq="no"
+AC_ARG_WITH([java], [AS_HELP_STRING([--with-java], [build Java language binding [default=no]])], [with_java=yes], [with_java=no])
+if test "x$with_java" != "xno"; then
+    AC_PATH_PROG(JAVAC, javac, "no",[$PATH:$JAVA_HOME/bin])
+    if test "x$JAVAC" = "xno"; then
+        AC_MSG_ERROR([To run configure with --with-java option, javac has to be on the path.]);
+    fi
+
+    AC_PATH_PROG(JAVAH, javah, "no",[$PATH:$JAVA_HOME/bin])
+    if test "x$JAVAH" = "xno"; then
+        AC_MSG_ERROR([To run configure with --with-java option, javah has to be on the path.]);
+    fi
+
+    AC_PATH_PROG(JAR, jar, "no", [$PATH:$JAVA_HOME/bin])
+    if test "x$JAR" = "xno"; then
+        AC_MSG_ERROR([To run configure with --with-java option, jar has to be on the path.]);
+    fi
+
+    if test "x$JAVA_HOME" = "x"; then
+        AC_MSG_ERROR([To run configure with --with-java, please set the JAVA_HOME variable to your JDK environment.]);
+    fi
+
+    AC_MSG_CHECKING([for jni.h in a $JAVA_HOME/include dir])
+    if test -f $JAVA_HOME/include/jni.h; then
+        AC_MSG_RESULT([yes])
+    else
+        AC_MSG_ERROR([Could not find jni.h in $JAVA_HOME/include directory.]);
+    fi
+
+    JAVAROOT=./
+    AC_SUBST(JAVAROOT)
+
+    case "${host_os}" in
+        *solaris*)
+            JAVA_INCLUDE="-I.. -I${JAVA_HOME}/include -I ${JAVA_HOME}/include/solaris"
+        ;;
+        *openbsd*)
+            JAVA_INCLUDE="-I.. -I${JAVA_HOME}/include -I ${JAVA_HOME}/include/openbsd"
+        ;;
+        *)
+            JAVA_INCLUDE="-I.. -I${JAVA_HOME}/include -I ${JAVA_HOME}/include/linux"
+        ;;
+    esac
+
+    AC_SUBST(JAVA_INCLUDE)
+
+    jzmq="yes"
+fi
+
 AM_CONDITIONAL(BUILD_PYTHON, test "x$pyzmq" = "xyes")
+AM_CONDITIONAL(BUILD_JAVA, test "x$jzmq" = "xyes")
 
 AC_SUBST(stdint)
 AC_SUBST(inttypes)
@@ -276,7 +327,7 @@ AC_TYPE_SIGNAL
 AC_CHECK_FUNCS(perror gettimeofday memset socket getifaddrs freeifaddrs)
 
 AC_OUTPUT(Makefile src/Makefile python/Makefile python/setup.py ruby/Makefile \
-    perf/Makefile perf/c/Makefile perf/cpp/Makefile)
+    java/Makefile perf/Makefile perf/c/Makefile perf/cpp/Makefile)
 
 AC_MSG_RESULT([])
 AC_MSG_RESULT([ ******************************************************** ])
@@ -294,5 +345,6 @@ AC_MSG_RESULT([   Ruby language binding: $rbzmq])
 if test "x$rbzmq" = "xyes"; then
 AC_MSG_RESULT([   Ruby library install dir: $rubydir])
 fi
+AC_MSG_RESULT([   Java language binding: $jzmq])
 AC_MSG_RESULT([])
 
diff --git a/java/Context.cpp b/java/Context.cpp
new file mode 100644
index 0000000..d8fcf99
--- /dev/null
+++ b/java/Context.cpp
@@ -0,0 +1,92 @@
+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "zmq.h"
+#include "org_zmq_Context.h"
+
+static jfieldID ctx_handle_fid = NULL;
+
+static void
+raise_exception (JNIEnv *env, int err)
+{
+    //  Get exception class.
+    jclass exception_class = env->FindClass ("java/lang/Exception");
+    assert (exception_class);
+
+    //  Get text description of the exception.
+    const char *err_msg = strerror (err);
+
+    //  Raise the exception.
+    int rc = env->ThrowNew (exception_class, err_msg);
+    assert (rc == 0);
+
+    //  Free the local ref.
+    env->DeleteLocalRef (exception_class);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Context_construct (JNIEnv *env, jobject obj,
+                                jint app_threads, jint io_threads)
+{
+    if (ctx_handle_fid == NULL) {
+        jclass cls = env->GetObjectClass (obj);
+        assert (cls);
+        ctx_handle_fid = env->GetFieldID (cls, "contextHandle", "J");
+        assert (ctx_handle_fid);
+        env->DeleteLocalRef (cls);
+    }
+
+    void *ctx = zmq_init (app_threads, io_threads);
+    if (ctx == NULL) {
+        raise_exception (env, errno);
+        return;
+    }
+
+    env->SetLongField (obj, ctx_handle_fid, (jlong) ctx);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Context_finalize (JNIEnv *env, jobject obj)
+{
+    void *ctx = (void*) env->GetLongField (obj, ctx_handle_fid);
+    assert (ctx);
+
+    int rc = zmq_term (ctx);
+    assert (rc == 0);
+}
+
+JNIEXPORT jlong JNICALL
+Java_org_zmq_Context_createSocket (JNIEnv *env, jobject obj, jint type)
+{
+    void *ctx = (void*) env->GetLongField (obj, ctx_handle_fid);
+    assert (ctx);
+
+    void *s = zmq_socket (ctx, type);
+    if (s == NULL) {
+        raise_exception (env, errno);
+        return -1;
+    }
+
+    return (jlong) s;
+}
diff --git a/java/Makefile.am b/java/Makefile.am
new file mode 100644
index 0000000..363f941
--- /dev/null
+++ b/java/Makefile.am
@@ -0,0 +1,72 @@
+# We do not want to install Jzmq.class file
+# user has to copy it to the right location.
+#jzmqdir = /tmp
+
+jarfile = Zmq.jar
+jardir = $(datadir)/java
+
+$(jarfile): $(dist_noinst_JAVA)
+	$(JAR) cf $(JARFLAGS) $@ org/zmq/*.class
+
+jar_DATA = $(jarfile)
+
+dist_noinst_JAVA = \
+	org/zmq/Context.java \
+	org/zmq/Socket.java \
+	org/zmq/Message.java
+
+lib_LTLIBRARIES = libjzmq.la
+libjzmq_la_SOURCES = \
+	Context.cpp \
+    org_zmq_Context.h \
+	Socket.cpp \
+    org_zmq_Socket.h \
+	Message.cpp \
+    org_zmq_Message.h
+
+libjzmq_la_CXXFLAGS = -I$(top_builddir)/src/libzmq \
+@JAVA_INCLUDE@ -I$(top_builddir)/include -I$(top_srcdir)/libjzmq -Wall -I /usr/lib/jvm/java-6-openjdk/include
+libjzmq_la_LDFLAGS = -version-info 0:0:0
+libjzmq_la_LIBADD = $(top_builddir)/src/libzmq.la
+
+BUILT_SOURCES = \
+    org/zmq/Context.class \
+    org_zmq_Context.h \
+	org/zmq/Socket.class \
+    org_zmq_Socket.h \
+	org/zmq/Message.class \
+    org_zmq_Message.h
+
+CLEANFILES = \
+	org/zmq/Context.class \
+	org_zmq_Context.h \
+	org/zmq/Socket.class \
+	org_zmq_Socket.h \
+	org/zmq/Message.class \
+	org_zmq_Message.h \
+	Zmq.jar
+
+$(srcdir)/Context.cpp: org_zmq_Context.h
+
+org_zmq_Context.h: org/zmq/Context.class
+	$(CLASSPATH_ENV) $(JAVAH) -jni -classpath . org.zmq.Context
+
+./org/zmq/Context.class: classdist_noinst.stamp
+
+$(srcdir)/Socket.cpp: org_zmq_Socket.h
+
+org_zmq_Socket.h: org/zmq/Socket.class
+	$(CLASSPATH_ENV) $(JAVAH) -jni -classpath . org.zmq.Socket
+
+./org/zmq/Socket.class: classdist_noinst.stamp
+
+$(srcdir)/Message.cpp: org_zmq_Message.h
+
+org_zmq_Message.h: org/zmq/Message.class
+	$(CLASSPATH_ENV) $(JAVAH) -jni -classpath . org.zmq.Message
+
+./org/zmq/Message.class: classdist_noinst.stamp
+
+dist-hook:
+	-rm $(distdir)/*.h
+
diff --git a/java/Message.cpp b/java/Message.cpp
new file mode 100644
index 0000000..2105216
--- /dev/null
+++ b/java/Message.cpp
@@ -0,0 +1,138 @@
+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "zmq.h"
+#include "org_zmq_Message.h"
+
+static jfieldID msg_handle_fid = NULL;
+
+static void
+raise_exception (JNIEnv *env, int err)
+{
+    //  Get exception class.
+    jclass exception_class = env->FindClass ("java/lang/Exception");
+    assert (exception_class);
+
+    //  Get text description of the exception.
+    const char *err_msg = strerror (err);
+
+    //  Raise the exception.
+    int rc = env->ThrowNew (exception_class, err_msg);
+    assert (rc == 0);
+
+    //  Free the local ref.
+    env->DeleteLocalRef (exception_class);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Message_construct (JNIEnv *env, jobject obj)
+{
+    if (msg_handle_fid == NULL) {
+        jclass cls = env->GetObjectClass (obj);
+        assert (cls != NULL);
+        msg_handle_fid = env->GetFieldID (cls, "msgHandle", "J");
+        assert (msg_handle_fid != NULL);
+        env->DeleteLocalRef (cls);
+    }
+
+    zmq_msg_t *msg = (zmq_msg_t*) malloc (sizeof (zmq_msg_t));
+    if (msg == NULL) {
+        raise_exception (env, ENOMEM);
+        return;
+    }
+
+    int rc = zmq_msg_init (msg);
+    assert (rc == 0);
+    env->SetLongField (obj, msg_handle_fid, (jlong) msg);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Message_constructWithData (JNIEnv *env, jobject obj,
+                                        jbyteArray payload)
+{
+    if (msg_handle_fid == NULL) {
+        jclass cls = env->GetObjectClass (obj);
+        assert (cls != NULL);
+        msg_handle_fid = env->GetFieldID (cls, "msgHandle", "J");
+        assert (msg_handle_fid != NULL);
+        env->DeleteLocalRef (cls);
+    }
+
+    zmq_msg_t *msg = (zmq_msg_t*) malloc (sizeof (zmq_msg_t));
+    if (msg == NULL) {
+        raise_exception (env, ENOMEM);
+        return;
+    }
+
+    jsize array_size = env->GetArrayLength (payload);
+    jbyte *array_data = env->GetByteArrayElements (payload, NULL);
+
+    int rc = zmq_msg_init_size (msg, array_size);
+    assert (rc == 0);
+
+    memcpy (zmq_msg_data (msg), array_data, array_size);
+    env->ReleaseByteArrayElements (payload, array_data, JNI_ABORT);
+
+    env->SetLongField (obj, msg_handle_fid, (jlong) msg);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Message_finalize (JNIEnv *env, jobject obj)
+{
+    zmq_msg_t *msg = (zmq_msg_t*) env->GetLongField (obj, msg_handle_fid);
+    assert (msg);
+
+    int rc = zmq_msg_close (msg);
+    assert (rc == 0);
+
+    free (msg);
+}
+
+JNIEXPORT jbyteArray JNICALL
+Java_org_zmq_Message_getMsgPayload (JNIEnv *env, jobject obj)
+{
+    zmq_msg_t *msg = (zmq_msg_t*) env->GetLongField (obj, msg_handle_fid);
+    assert (msg);
+
+    jsize msg_size = zmq_msg_size (msg);
+    jbyte *msg_data = (jbyte*) zmq_msg_data (msg);
+
+    jbyteArray payload = env->NewByteArray (msg_size);
+    if (payload == NULL)
+        return NULL;
+
+    env->SetByteArrayRegion (payload, 0, msg_size, msg_data);
+    assert (!env->ExceptionCheck ());
+
+    return payload;
+}
+
+JNIEXPORT jint JNICALL
+Java_org_zmq_Message_getMsgType (JNIEnv *env, jobject obj)
+{
+    zmq_msg_t *msg = (zmq_msg_t*) env->GetLongField (obj, msg_handle_fid);
+    assert (msg);
+
+    return (jint) zmq_msg_type (msg);
+}
diff --git a/java/Socket.cpp b/java/Socket.cpp
new file mode 100644
index 0000000..eb3c1e3
--- /dev/null
+++ b/java/Socket.cpp
@@ -0,0 +1,276 @@
+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "zmq.h"
+#include "org_zmq_Socket.h"
+
+static jfieldID socket_handle_fid = NULL;
+static jclass msg_class = NULL;
+static jmethodID msg_constructor;
+static jmethodID get_msg_handle_mid = NULL;
+static jmethodID create_socket_mid = NULL;
+
+static void
+raise_exception (JNIEnv *env, int err)
+{
+    //  Get exception class.
+    jclass exception_class = env->FindClass ("java/lang/Exception");
+    assert (exception_class);
+
+    //  Get text description of the exception.
+    const char *err_msg = strerror (err);
+
+    //  Raise the exception.
+    int rc = env->ThrowNew (exception_class, err_msg);
+    assert (rc == 0);
+
+    //  Free the local ref.
+    env->DeleteLocalRef (exception_class);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Socket_construct (JNIEnv *env, jobject obj, jobject context,
+                               jint type)
+{
+    if (socket_handle_fid == NULL) {
+        jclass cls = env->GetObjectClass (obj);
+        assert (cls);
+        socket_handle_fid = env->GetFieldID (cls, "socketHandle", "J");
+        assert (socket_handle_fid);
+        env->DeleteLocalRef (cls);
+    }
+
+    if (create_socket_mid == NULL) {
+        jclass cls = env->FindClass ("org/zmq/Context");
+        assert (cls);
+        create_socket_mid = env->GetMethodID (cls, "createSocket", "(I)J");
+        assert (create_socket_mid);
+        env->DeleteLocalRef (cls);
+    }
+
+    if (msg_class == NULL) {
+        jclass cls = env->FindClass ("org/zmq/Message");
+        assert (cls);
+
+        msg_constructor = env->GetMethodID (cls, "<init>", "()V");
+        assert (msg_constructor);
+
+        get_msg_handle_mid = env->GetMethodID (cls, "getMsgHandle", "()J");
+        assert (get_msg_handle_mid);
+
+        msg_class = (jclass) env->NewGlobalRef (cls);
+        assert (msg_class);
+        env->DeleteLocalRef (cls);
+    }
+
+    void *s = (void *) env->CallLongMethod (context, create_socket_mid, type);
+    if (env->ExceptionCheck ())
+        return;
+
+    env->SetLongField (obj, socket_handle_fid, (jlong) s);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Socket_finalize (JNIEnv *env, jobject obj)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+    int rc = zmq_close (s);
+    assert (rc == 0);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Socket_setHwm (JNIEnv *env, jobject obj, jlong hwm)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+    int rc = zmq_setsockopt (s, ZMQ_HWM, &hwm, sizeof hwm);
+    if (rc == -1)
+        raise_exception (env, errno);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Socket_setLwm (JNIEnv *env, jobject obj, jlong lwm)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+
+    int rc = zmq_setsockopt (s, ZMQ_LWM, &lwm, sizeof lwm);
+    if (rc == -1)
+        raise_exception (env, errno);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Socket_setSwap (JNIEnv *env, jobject obj, jlong swap_size)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+
+    int rc = zmq_setsockopt (s, ZMQ_SWAP, &swap_size, sizeof swap_size);
+    if (rc == -1)
+        raise_exception (env, errno);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Socket_setMask (JNIEnv *env, jobject obj, jlong mask)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+
+    int rc = zmq_setsockopt (s, ZMQ_MASK, &mask, sizeof mask);
+    if (rc == -1)
+        raise_exception (env, errno);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Socket_setAffinity (JNIEnv *env, jobject obj, jlong affinity)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+
+    int rc = zmq_setsockopt (s, ZMQ_AFFINITY, &affinity, sizeof affinity);
+    if (rc == -1)
+        raise_exception (env, errno);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Socket_setIdentity (JNIEnv *env, jobject obj, jstring identity)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+
+    if (identity == NULL) {
+        raise_exception (env, EINVAL);
+        return;
+    }
+
+    const char *c_identity = env->GetStringUTFChars (identity, NULL);
+    if (c_identity == NULL)
+        return;
+
+    int rc = zmq_setsockopt (s, ZMQ_IDENTITY, c_identity, sizeof c_identity);
+    env->ReleaseStringUTFChars (identity, c_identity);
+
+    if (rc == -1)
+        raise_exception (env, errno);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Socket_bind (JNIEnv *env, jobject obj, jstring addr)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+
+    if (addr == NULL) {
+        raise_exception (env, EINVAL);
+        return;
+    }
+
+    const char *c_addr = env->GetStringUTFChars (addr, NULL);
+    if (c_addr == NULL)
+        return;
+
+    int rc = zmq_bind (s, c_addr);
+    env->ReleaseStringUTFChars (addr, c_addr);
+
+    if (rc == -1)
+        raise_exception (env, errno);
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Socket_connect (JNIEnv *env, jobject obj, jstring addr)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+
+    if (addr == NULL) {
+        raise_exception (env, EINVAL);
+        return;
+    }
+
+    const char *c_addr = env->GetStringUTFChars (addr, NULL);
+    if (c_addr == NULL)
+        return;
+
+    int rc = zmq_connect (s, c_addr);
+    env->ReleaseStringUTFChars (addr, c_addr);
+
+    if (rc == -1)
+        raise_exception (env, errno);
+}
+
+JNIEXPORT jint JNICALL
+Java_org_zmq_Socket_send (JNIEnv *env, jobject obj, jobject msg, jlong flags)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+
+    zmq_msg_t *zmq_msg = (zmq_msg_t *)
+        env->CallLongMethod (msg, get_msg_handle_mid);
+
+    if (env->ExceptionCheck ())
+        return -1;
+
+    int rc = zmq_send (s, zmq_msg, (int) flags);
+    if (rc == -1) {
+        raise_exception (env, errno);
+        return -1;
+    }
+
+    return rc;
+}
+
+JNIEXPORT void JNICALL
+Java_org_zmq_Socket_flush (JNIEnv *env, jobject obj)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+
+    zmq_flush (s);
+}
+
+JNIEXPORT jobject JNICALL
+Java_org_zmq_Socket_recv (JNIEnv *env, jobject obj, jlong flags)
+{
+    void *s = (void*) env->GetLongField (obj, socket_handle_fid);
+    assert (s);
+
+    jobject msg = env->NewObject (msg_class, msg_constructor);
+    if (msg == NULL)
+        return NULL;
+
+    zmq_msg_t *zmq_msg = (zmq_msg_t*)
+        env->CallLongMethod (msg, get_msg_handle_mid);
+
+    if (env->ExceptionCheck ())
+        return NULL;
+
+    int rc = zmq_recv (s, zmq_msg, (int) flags);
+    if (rc == -1) {
+        raise_exception (env, errno);
+        return NULL;
+    }
+
+    return msg;
+}
diff --git a/java/org/zmq/Context.java b/java/org/zmq/Context.java
new file mode 100644
index 0000000..8bc4d57
--- /dev/null
+++ b/java/org/zmq/Context.java
@@ -0,0 +1,47 @@
+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package org.zmq;
+
+public class Context {
+    static {
+        System.loadLibrary("jzmq");
+    }
+
+    /**
+     * Class constructor.
+     *
+     * @param appThreads maximum number of application threads.
+     * @param ioThreads size of the threads pool to handle I/O operations.
+     */
+    public Context (int appThreads, int ioThreads) {
+        construct (appThreads, ioThreads);
+    }
+
+    public native long createSocket (int type);
+
+    /** Initialize the JNI interface */
+    protected native void construct (int appThreads, int ioThreads);
+
+    /** Free resources used by JNI driver. */
+    protected native void finalize ();
+
+    /** Opaque data used by JNI driver. */
+    private long contextHandle;
+}
diff --git a/java/org/zmq/Message.java b/java/org/zmq/Message.java
new file mode 100644
index 0000000..3691410
--- /dev/null
+++ b/java/org/zmq/Message.java
@@ -0,0 +1,66 @@
+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package org.zmq;
+
+public class Message {
+    static {
+        System.loadLibrary("jzmq");
+    }
+
+    /**
+     * Class constructor.
+     */
+    public Message () {
+        construct ();
+    }
+
+    public Message (byte [] payload) {
+        constructWithData (payload);
+    }
+
+    /**
+     * Get message payload.
+     */
+    public native byte [] getMsgPayload ();
+
+    /**
+     * Get message type.
+     */
+    public native int getMsgType ();
+
+    /**
+     * Get low-level message handler.
+     */
+    public long getMsgHandle () {
+        return msgHandle;
+    }
+
+    /** Initialize the JNI interface */
+    protected native void construct ();
+
+    protected native void constructWithData (byte [] payload);
+
+    /** Free resources used by JNI driver. */
+    protected native void finalize ();
+
+    /** Opaque data used by JNI driver. */
+    private long msgHandle;
+}
+
diff --git a/java/org/zmq/Socket.java b/java/org/zmq/Socket.java
new file mode 100644
index 0000000..3bfbfec
--- /dev/null
+++ b/java/org/zmq/Socket.java
@@ -0,0 +1,141 @@
+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package org.zmq;
+
+public class Socket {
+    static {
+        System.loadLibrary("jzmq");
+    }
+
+    public static final int ZMQ_MAX_VSM_SIZE = 30;
+
+    public static final int ZMQ_GAP = 1;
+
+    public static final int ZMQ_DELIMITER = 31;
+
+    public static final int ZMQ_NOBLOCK = 1;
+
+    public static final int ZMQ_NOFLUSH = 2;
+
+    public static final int ZMQ_P2P = 0;
+
+    public static final int ZMQ_PUB = 1;
+
+    public static final int ZMQ_SUB = 2;
+
+    /**
+     * Class constructor.
+     *
+     * @param context
+     * @param type
+     */
+    public Socket (Context context, int type) {
+        ctx = context;
+        construct (context, type);
+    }
+
+    /**
+     * Set the high watermark on the socket.
+     *
+     * @param hwm high watermark.
+     */
+    public native void setHwm (long hwm);
+
+    /**
+     * Set the low watermark on the socket.
+     *
+     * @param lwm low watermark.
+     */
+    public native void setLwm (long lwm);
+
+    /**
+     * Set swap size.
+     *
+     * @param swap_size swap size.
+     */
+    public native void setSwap (long swap_size);
+
+    /**
+     * Set reception mask.
+     *
+     * @param mask mask.
+     */
+    public native void setMask (long mask);
+
+    /**
+     * Set affinity.
+     *
+     * @param affinity
+     */
+    public native void setAffinity (long affinity);
+
+    /**
+     * Set identity.
+     *
+     * @param identity
+     */
+    public native void setIdentity (String identity);
+
+    /**
+     * @param addr
+     */
+    public native void bind (String addr);
+
+    /**
+     * Connect.
+     *
+     * @param addr
+     */
+    public native void connect (String addr);
+
+    /**
+     * Send.
+     *
+     * @param message
+     * @param block
+     */
+    public native int send (Message msg, long flags);
+
+    /**
+     * Flush all messages sent with flush flag false down the stream.
+     */
+    public native void flush ();
+
+    /**
+     * Receive message.
+     *
+     * @param block
+     * @return
+     */
+    public native Message recv (long flags);
+
+    /** Initialize JNI driver */
+    protected native void construct (Context context, int type);
+
+    /** Free all resources used by JNI driver. */
+    protected native void finalize ();
+
+    /** Keep reference to ZMQ context so it is not garbage collected */
+    private Context ctx;
+
+    /** Opaque data used by JNI driver. */
+    private long socketHandle;
+
+}