Add Java binding

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;
+}