org.rocksdb.WriteBufferManager Maven / Gradle / Ivy
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
package org.rocksdb;
/**
* Java wrapper over native write_buffer_manager class
*/
public class WriteBufferManager extends RocksObject {
/**
* Construct a new instance of WriteBufferManager.
*
* Check
* https://github.com/facebook/rocksdb/wiki/Write-Buffer-Manager
* for more details on when to use it
*
* @param bufferSizeBytes buffer size(in bytes) to use for native write_buffer_manager
* @param cache cache whose memory should be bounded by this write buffer manager
* @param allowStall if set true, it will enable stalling of writes when memory_usage() exceeds
* buffer_size.
* It will wait for flush to complete and memory usage to drop down.
*/
public WriteBufferManager(
final long bufferSizeBytes, final Cache cache, final boolean allowStall) {
super(newWriteBufferManagerInstance(bufferSizeBytes, cache.nativeHandle_, allowStall));
this.allowStall_ = allowStall;
}
public WriteBufferManager(final long bufferSizeBytes, final Cache cache){
this(bufferSizeBytes, cache, false);
}
public boolean allowStall() {
return allowStall_;
}
private static long newWriteBufferManagerInstance(
final long bufferSizeBytes, final long cacheHandle, final boolean allowStall) {
RocksDB.loadLibrary();
return newWriteBufferManager(bufferSizeBytes, cacheHandle, allowStall);
}
private static native long newWriteBufferManager(
final long bufferSizeBytes, final long cacheHandle, final boolean allowStall);
@Override
protected void disposeInternal(final long handle) {
disposeInternalJni(handle);
}
private static native void disposeInternalJni(final long handle);
private final boolean allowStall_;
}