mirror of https://github.com/facebook/rocksdb.git
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
//
|
|
// This file implements the callback "bridge" between Java and C++ for
|
|
// JNI Callbacks from C++ to sub-classes or org.rocksdb.RocksCallbackObject
|
|
|
|
#include <assert.h>
|
|
#include "rocksjni/jnicallback.h"
|
|
#include "rocksjni/portal.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
JniCallback::JniCallback(JNIEnv* env, jobject jcallback_obj) {
|
|
// Note: jcallback_obj may be accessed by multiple threads,
|
|
// so we ref the jvm not the env
|
|
const jint rs = env->GetJavaVM(&m_jvm);
|
|
if(rs != JNI_OK) {
|
|
// exception thrown
|
|
return;
|
|
}
|
|
|
|
// Note: we may want to access the Java callback object instance
|
|
// across multiple method calls, so we create a global ref
|
|
assert(jcallback_obj != nullptr);
|
|
m_jcallback_obj = env->NewGlobalRef(jcallback_obj);
|
|
if(jcallback_obj == nullptr) {
|
|
// exception thrown: OutOfMemoryError
|
|
return;
|
|
}
|
|
}
|
|
|
|
JNIEnv* JniCallback::getJniEnv(jboolean* attached) const {
|
|
return JniUtil::getJniEnv(m_jvm, attached);
|
|
}
|
|
|
|
void JniCallback::releaseJniEnv(jboolean& attached) const {
|
|
JniUtil::releaseJniEnv(m_jvm, attached);
|
|
}
|
|
|
|
JniCallback::~JniCallback() {
|
|
jboolean attached_thread = JNI_FALSE;
|
|
JNIEnv* env = getJniEnv(&attached_thread);
|
|
assert(env != nullptr);
|
|
|
|
if (m_jcallback_obj != nullptr) {
|
|
env->DeleteGlobalRef(m_jcallback_obj);
|
|
}
|
|
|
|
releaseJniEnv(attached_thread);
|
|
}
|
|
} // namespace ROCKSDB_NAMESPACE
|