6528ecc800
Summary: Allows adding event listeners in RocksJava. * Adds listeners getter and setter in `Options` and `DBOptions` classes. * Adds `EventListener` Java interface and base class for implementing custom event listener callbacks - `AbstractEventListener`, which has an underlying native callback class implementing C++ `EventListener` class. * `AbstractEventListener` class has mechanism for selectively enabling its callback methods in order to prevent invoking Java method if it is not implemented. This decreases performance cost in case only subset of event listener callback methods is needed - the JNI code for remaining "no-op" callbacks is not executed. * The code is covered by unit tests in `EventListenerTest.java`, there are also tests added for setting/getting listeners field in `OptionsTest.java` and `DBOptionsTest.java`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7425 Reviewed By: pdillinger Differential Revision: D24063390 Pulled By: jay-zhuang fbshipit-source-id: 508c359538983d6b765e70d9989c351794a944ee
33 lines
984 B
C++
33 lines
984 B
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// This file implements the callback "bridge" between Java and C++ for
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// JNI Callbacks from C++ to sub-classes or org.rocksdb.RocksCallbackObject
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#ifndef JAVA_ROCKSJNI_JNICALLBACK_H_
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#define JAVA_ROCKSJNI_JNICALLBACK_H_
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#include <jni.h>
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#include "rocksdb/rocksdb_namespace.h"
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namespace ROCKSDB_NAMESPACE {
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class JniCallback {
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public:
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JniCallback(JNIEnv* env, jobject jcallback_obj);
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virtual ~JniCallback();
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const jobject& GetJavaObject() const { return m_jcallback_obj; }
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protected:
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JavaVM* m_jvm;
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jobject m_jcallback_obj;
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JNIEnv* getJniEnv(jboolean* attached) const;
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void releaseJniEnv(jboolean& attached) const;
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};
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} // namespace ROCKSDB_NAMESPACE
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#endif // JAVA_ROCKSJNI_JNICALLBACK_H_
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