org.apache.lucene.store.bytebuffer.PlainByteBufferAllocator Maven / Gradle / Ivy
package org.apache.lucene.store.bytebuffer;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.io.IOException;
import java.nio.ByteBuffer;
/**
* A simple byte buffer allocator that does not caching. The direct flag
* allows to control if the byte buffer will be allocated off heap or not.
*/
public class PlainByteBufferAllocator implements ByteBufferAllocator {
protected final boolean direct;
protected final int smallBufferSizeInBytes;
protected final int largeBufferSizeInBytes;
/**
* Constructs a new plain byte buffer allocator that does no caching.
*
* @param direct If set to true, will allocate direct buffers (off heap).
* @param smallBufferSizeInBytes The size (in bytes) of the small buffer allocation.
* @param largeBufferSizeInBytes The size (in bytes) of the large buffer allocation.
*/
public PlainByteBufferAllocator(boolean direct, int smallBufferSizeInBytes, int largeBufferSizeInBytes) {
this.direct = direct;
this.smallBufferSizeInBytes = smallBufferSizeInBytes;
this.largeBufferSizeInBytes = largeBufferSizeInBytes;
}
public int sizeInBytes(Type type) {
return type == Type.SMALL ? smallBufferSizeInBytes : largeBufferSizeInBytes;
}
public ByteBuffer allocate(Type type) throws IOException {
int sizeToAllocate = type == Type.SMALL ? smallBufferSizeInBytes : largeBufferSizeInBytes;
if (direct) {
return ByteBuffer.allocateDirect(sizeToAllocate);
}
return ByteBuffer.allocate(sizeToAllocate);
}
public void release(ByteBuffer buffer) {
Cleaner.clean(buffer);
}
public void close() {
// nothing to do here...
}
}