mirror of
https://github.com/zeromq/libzmq.git
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113 lines
2.9 KiB
C++
Executable File
113 lines
2.9 KiB
C++
Executable File
/*
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Copyright (c) 2007-2010 iMatix Corporation
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the Lesser GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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Lesser GNU General Public License for more details.
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You should have received a copy of the Lesser GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <assert.h>
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#include <errno.h>
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#include "../c/zmq.h"
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#include "org_zmq_Context.h"
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/** Handle to Java's Context::contextHandle. */
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static jfieldID ctx_handle_fid = NULL;
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/**
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* Make sure we have a valid pointer to Java's Context::contextHandle.
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*/
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static void ensure_context (JNIEnv *env, jobject obj)
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{
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if (ctx_handle_fid == NULL) {
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jclass cls = env->GetObjectClass (obj);
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assert (cls);
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ctx_handle_fid = env->GetFieldID (cls, "contextHandle", "J");
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assert (ctx_handle_fid);
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env->DeleteLocalRef (cls);
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}
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}
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/**
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* Get the value of Java's Context::contextHandle.
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*/
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static void *get_context (JNIEnv *env, jobject obj)
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{
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ensure_context (env, obj);
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void *s = (void*) env->GetLongField (obj, ctx_handle_fid);
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return s;
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}
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/**
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* Set the value of Java's Context::contextHandle.
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*/
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static void put_context (JNIEnv *env, jobject obj, void *s)
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{
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ensure_context (env, obj);
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env->SetLongField (obj, ctx_handle_fid, (jlong) s);
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}
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/**
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* Raise an exception that includes 0MQ's error message.
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*/
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static void raise_exception (JNIEnv *env, int err)
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{
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// Get exception class.
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jclass exception_class = env->FindClass ("java/lang/Exception");
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assert (exception_class);
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// Get text description of the exception.
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const char *err_msg = zmq_strerror (err);
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// Raise the exception.
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int rc = env->ThrowNew (exception_class, err_msg);
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env->DeleteLocalRef (exception_class);
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assert (rc == 0);
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}
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/**
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* Called to construct a Java Context object.
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*/
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JNIEXPORT void JNICALL Java_org_zmq_Context_construct (JNIEnv *env,
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jobject obj, jint app_threads, jint io_threads, jint flags)
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{
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void *c = get_context (env, obj);
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assert (!c);
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c = zmq_init (app_threads, io_threads, flags);
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put_context (env, obj, c);
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if (!c) {
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raise_exception (env, errno);
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return;
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}
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}
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/**
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* Called to destroy a Java Context object.
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*/
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JNIEXPORT void JNICALL Java_org_zmq_Context_finalize (JNIEnv *env,
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jobject obj)
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{
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void *c = get_context (env, obj);
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assert (c);
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int rc = zmq_term (c);
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put_context (env, obj, NULL);
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assert (rc == 0);
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}
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