CheckpointHandlerFactory.java

package cz.cuni.mff.d3s.been.hostruntime;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

import cz.cuni.mff.d3s.been.cluster.context.ClusterContext;
import cz.cuni.mff.d3s.been.socketworks.twoway.ReadReplyHandler;
import cz.cuni.mff.d3s.been.socketworks.twoway.ReadReplyHandlerFactory;

/**
 * CheckPoint handler factory.
 * 
 * @author Radek Mácha
 */
class CheckpointHandlerFactory implements ReadReplyHandlerFactory, HandlerRecycler {

	private final ClusterContext ctx;
	private final BlockingQueue<ReadReplyHandler> recyclableHandlers;

	private CheckpointHandlerFactory(ClusterContext ctx) {
		this.ctx = ctx;
		recyclableHandlers = new LinkedBlockingQueue<ReadReplyHandler>();
	}

	/**
	 * 
	 * Crates CheckPoint factories.
	 * 
	 * @param ctx
	 *          connection to the cluster
	 * @return CheckPoint factory
	 */
	public static CheckpointHandlerFactory create(ClusterContext ctx) {
		return new CheckpointHandlerFactory(ctx);
	}

	@Override
	public ReadReplyHandler getHandler() {
		ReadReplyHandler handler = recyclableHandlers.poll();
		return handler != null ? handler : CheckpointHandler.create(ctx, this);
	}

	@Override
	public void recycle(ReadReplyHandler handler) {
		recyclableHandlers.add(handler);
	}

}