43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
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// 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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// rocksdb::TransactionNotifier.
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#ifndef JAVA_ROCKSJNI_TRANSACTION_NOTIFIER_JNICALLBACK_H_
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#define JAVA_ROCKSJNI_TRANSACTION_NOTIFIER_JNICALLBACK_H_
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#include <jni.h>
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#include "rocksdb/utilities/transaction.h"
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#include "rocksjni/jnicallback.h"
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namespace rocksdb {
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/**
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* This class acts as a bridge between C++
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* and Java. The methods in this class will be
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* called back from the RocksDB TransactionDB or OptimisticTransactionDB (C++),
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* we then callback to the appropriate Java method
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* this enables TransactionNotifier to be implemented in Java.
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*
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* Unlike RocksJava's Comparator JNI Callback, we do not attempt
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* to reduce Java object allocations by caching the Snapshot object
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* presented to the callback. This could be revisited in future
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* if performance is lacking.
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*/
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class TransactionNotifierJniCallback: public JniCallback,
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public TransactionNotifier {
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public:
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TransactionNotifierJniCallback(JNIEnv* env, jobject jtransaction_notifier);
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virtual void SnapshotCreated(const Snapshot* newSnapshot);
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private:
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jmethodID m_jsnapshot_created_methodID;
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};
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} // namespace rocksdb
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#endif // JAVA_ROCKSJNI_TRANSACTION_NOTIFIER_JNICALLBACK_H_
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