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datarouter-conveyor

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/**
 * Copyright © 2009 HotPads ([email protected])
 *
 * Licensed 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 io.datarouter.conveyor;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Queue;
import java.util.concurrent.ArrayBlockingQueue;

public class MemoryBuffer implements Buffer{

	private final String name;
	private final Queue queue;

	public MemoryBuffer(String name, int maxSize){
		this.name = name;
		this.queue = new ArrayBlockingQueue<>(maxSize);
	}

	@Override
	public String getName(){
		return name;
	}

	public boolean offer(T obj){
		boolean accepted = queue.offer(obj);
		if(!accepted){
			ConveyorCounters.inc(this, "offer rejected", 1);
		}
		return accepted;
	}

	public boolean offerMulti(Collection objects){
		for(T obj : objects){
			if(!offer(obj)){
				return false;
			}
		}
		return true;
	}

	public List pollMultiWithLimit(int limit){
		List result = new ArrayList<>();
		while(result.size() < limit){
			T obj = queue.poll();
			if(obj == null){
				break;
			}
			result.add(obj);
		}
		return result;
	}

}