rocksdb/java/rocksjni/writebatchhandlerjnicallback.h

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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// This file implements the callback "bridge" between Java and C++ for
// rocksdb::WriteBatch::Handler.
#ifndef JAVA_ROCKSJNI_WRITEBATCHHANDLERJNICALLBACK_H_
#define JAVA_ROCKSJNI_WRITEBATCHHANDLERJNICALLBACK_H_
#include <jni.h>
#include "rocksdb/write_batch.h"
namespace rocksdb {
/**
* This class acts as a bridge between C++
* and Java. The methods in this class will be
* called back from the RocksDB storage engine (C++)
* which calls the appropriate Java method.
* This enables Write Batch Handlers to be implemented in Java.
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*/
class WriteBatchHandlerJniCallback : public WriteBatch::Handler {
public:
WriteBatchHandlerJniCallback(
JNIEnv* env, jobject jWriteBackHandler);
~WriteBatchHandlerJniCallback();
void Put(const Slice& key, const Slice& value);
void Merge(const Slice& key, const Slice& value);
void Delete(const Slice& key);
void LogData(const Slice& blob);
bool Continue();
private:
JNIEnv* m_env;
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jobject m_jWriteBatchHandler;
jbyteArray sliceToJArray(const Slice& s);
jmethodID m_jPutMethodId;
jmethodID m_jMergeMethodId;
jmethodID m_jDeleteMethodId;
jmethodID m_jLogDataMethodId;
jmethodID m_jContinueMethodId;
};
} // namespace rocksdb
#endif // JAVA_ROCKSJNI_WRITEBATCHHANDLERJNICALLBACK_H_