105 lines
3.0 KiB
C++
105 lines
3.0 KiB
C++
// Copyright (c) 2014, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same 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::Comparator.
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#include "rocksjni/writebatchhandlerjnicallback.h"
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#include "rocksjni/portal.h"
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namespace rocksdb {
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WriteBatchHandlerJniCallback::WriteBatchHandlerJniCallback(
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JNIEnv* env, jobject jWriteBatchHandler)
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: m_env(env) {
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// Note: we want to access the Java WriteBatchHandler instance
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// across multiple method calls, so we create a global ref
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m_jWriteBatchHandler = env->NewGlobalRef(jWriteBatchHandler);
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m_jPutMethodId = WriteBatchHandlerJni::getPutMethodId(env);
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m_jMergeMethodId = WriteBatchHandlerJni::getMergeMethodId(env);
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m_jDeleteMethodId = WriteBatchHandlerJni::getDeleteMethodId(env);
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m_jLogDataMethodId = WriteBatchHandlerJni::getLogDataMethodId(env);
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m_jContinueMethodId = WriteBatchHandlerJni::getContinueMethodId(env);
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}
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void WriteBatchHandlerJniCallback::Put(const Slice& key, const Slice& value) {
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const jbyteArray j_key = sliceToJArray(key);
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const jbyteArray j_value = sliceToJArray(value);
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m_env->CallVoidMethod(
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m_jWriteBatchHandler,
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m_jPutMethodId,
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j_key,
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j_value);
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m_env->DeleteLocalRef(j_value);
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m_env->DeleteLocalRef(j_key);
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}
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void WriteBatchHandlerJniCallback::Merge(const Slice& key, const Slice& value) {
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const jbyteArray j_key = sliceToJArray(key);
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const jbyteArray j_value = sliceToJArray(value);
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m_env->CallVoidMethod(
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m_jWriteBatchHandler,
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m_jMergeMethodId,
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j_key,
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j_value);
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m_env->DeleteLocalRef(j_value);
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m_env->DeleteLocalRef(j_key);
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}
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void WriteBatchHandlerJniCallback::Delete(const Slice& key) {
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const jbyteArray j_key = sliceToJArray(key);
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m_env->CallVoidMethod(
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m_jWriteBatchHandler,
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m_jDeleteMethodId,
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j_key);
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m_env->DeleteLocalRef(j_key);
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}
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void WriteBatchHandlerJniCallback::LogData(const Slice& blob) {
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const jbyteArray j_blob = sliceToJArray(blob);
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m_env->CallVoidMethod(
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m_jWriteBatchHandler,
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m_jLogDataMethodId,
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j_blob);
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m_env->DeleteLocalRef(j_blob);
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}
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bool WriteBatchHandlerJniCallback::Continue() {
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jboolean jContinue = m_env->CallBooleanMethod(
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m_jWriteBatchHandler,
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m_jContinueMethodId);
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return static_cast<bool>(jContinue == JNI_TRUE);
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}
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/*
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* Creates a Java Byte Array from the data in a Slice
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*
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* When calling this function
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* you must remember to call env->DeleteLocalRef
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* on the result after you have finished with it
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*/
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jbyteArray WriteBatchHandlerJniCallback::sliceToJArray(const Slice& s) {
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jbyteArray ja = m_env->NewByteArray(s.size());
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m_env->SetByteArrayRegion(
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ja, 0, s.size(),
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reinterpret_cast<const jbyte*>(s.data()));
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return ja;
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}
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WriteBatchHandlerJniCallback::~WriteBatchHandlerJniCallback() {
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m_env->DeleteGlobalRef(m_jWriteBatchHandler);
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}
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} // namespace rocksdb
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