Add Java binding

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);
+}