/*
* 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.
*/
package org.apache.nifi.controller.repository.io;
import java.util.Collection;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
public class MemoryManager {
private final int blockSize;
private final BlockingQueue<byte[]> queue;
public MemoryManager(final long totalSize, final int blockSize) {
this.blockSize = blockSize;
final int numBlocks = (int) (totalSize / blockSize);
queue = new LinkedBlockingQueue<>(numBlocks);
for (int i = 0; i < numBlocks; i++) {
queue.offer(new byte[blockSize]);
}
}
byte[] checkOut() {
return queue.poll();
}
void checkIn(final byte[] buffer) {
queue.offer(buffer);
}
void checkIn(final Collection<byte[]> buffers) {
queue.addAll(buffers);
}
int getBlockSize() {
return blockSize;
}
}