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rocksdb/java/rocksjni/writebatchhandlerjnicallbac...

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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::Comparator.
#include "rocksjni/writebatchhandlerjnicallback.h"
#include "rocksjni/portal.h"
namespace rocksdb {
WriteBatchHandlerJniCallback::WriteBatchHandlerJniCallback(
JNIEnv* env, jobject jWriteBatchHandler)
: m_env(env) {
// Note: we want to access the Java WriteBatchHandler instance
// across multiple method calls, so we create a global ref
m_jWriteBatchHandler = env->NewGlobalRef(jWriteBatchHandler);
m_jPutMethodId = WriteBatchHandlerJni::getPutMethodId(env);
m_jMergeMethodId = WriteBatchHandlerJni::getMergeMethodId(env);
m_jDeleteMethodId = WriteBatchHandlerJni::getDeleteMethodId(env);
m_jLogDataMethodId = WriteBatchHandlerJni::getLogDataMethodId(env);
m_jContinueMethodId = WriteBatchHandlerJni::getContinueMethodId(env);
}
void WriteBatchHandlerJniCallback::Put(const Slice& key, const Slice& value) {
const jbyteArray j_key = sliceToJArray(key);
const jbyteArray j_value = sliceToJArray(value);
m_env->CallVoidMethod(
m_jWriteBatchHandler,
m_jPutMethodId,
j_key,
j_value);
m_env->DeleteLocalRef(j_value);
m_env->DeleteLocalRef(j_key);
}
void WriteBatchHandlerJniCallback::Merge(const Slice& key, const Slice& value) {
const jbyteArray j_key = sliceToJArray(key);
const jbyteArray j_value = sliceToJArray(value);
m_env->CallVoidMethod(
m_jWriteBatchHandler,
m_jMergeMethodId,
j_key,
j_value);
m_env->DeleteLocalRef(j_value);
m_env->DeleteLocalRef(j_key);
}
void WriteBatchHandlerJniCallback::Delete(const Slice& key) {
const jbyteArray j_key = sliceToJArray(key);
m_env->CallVoidMethod(
m_jWriteBatchHandler,
m_jDeleteMethodId,
j_key);
m_env->DeleteLocalRef(j_key);
}
void WriteBatchHandlerJniCallback::LogData(const Slice& blob) {
const jbyteArray j_blob = sliceToJArray(blob);
m_env->CallVoidMethod(
m_jWriteBatchHandler,
m_jLogDataMethodId,
j_blob);
m_env->DeleteLocalRef(j_blob);
}
bool WriteBatchHandlerJniCallback::Continue() {
jboolean jContinue = m_env->CallBooleanMethod(
m_jWriteBatchHandler,
m_jContinueMethodId);
return static_cast<bool>(jContinue == JNI_TRUE);
}
/*
* Creates a Java Byte Array from the data in a Slice
*
* When calling this function
* you must remember to call env->DeleteLocalRef
* on the result after you have finished with it
*/
jbyteArray WriteBatchHandlerJniCallback::sliceToJArray(const Slice& s) {
jbyteArray ja = m_env->NewByteArray(s.size());
m_env->SetByteArrayRegion(
ja, 0, s.size(),
reinterpret_cast<const jbyte*>(s.data()));
return ja;
}
WriteBatchHandlerJniCallback::~WriteBatchHandlerJniCallback() {
m_env->DeleteGlobalRef(m_jWriteBatchHandler);
}
} // namespace rocksdb