BatchSender.java

package ch.usi.da.dlog;
/* 
 * Copyright (c) 2014 Università della Svizzera italiana (USI)
 * 
 * This file is part of URingPaxos.
 *
 * URingPaxos is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * URingPaxos is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with URingPaxos.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;

import org.apache.log4j.Logger;
import org.apache.thrift.transport.TTransportException;
import org.apache.zookeeper.KeeperException;

import ch.usi.da.dlog.message.Command;
import ch.usi.da.dlog.message.Message;
import ch.usi.da.dlog.transport.ABSender;
import ch.usi.da.dlog.transport.Response;
import ch.usi.da.dlog.transport.ThriftABSender;

/**
 * Name: BatchSender<br>
 * Description: <br>
 * 
 * Creation date: Apr 07, 2014<br>
 * $Id$
 * 
 * @author Samuel Benz benz@geoid.ch
 */
public class BatchSender implements Runnable {
	
	private final static Logger logger = Logger.getLogger(BatchSender.class);

	private final ABSender sender;
	
	private final Client client;
	
	private final BlockingQueue<Response> queue;
	
	private final int batch_size = 8912; // 0: disable
	
	public BatchSender(int ring, Client client) throws TTransportException, IOException, KeeperException, InterruptedException {
		this.client = client;
		sender = getThriftABSender(ring,client.getConnectMap().get(ring));
		queue = client.getSendQueues().get(ring);
	}
	
	public ABSender getThriftABSender(int ring, int clientID) throws TTransportException {
		String host = "127.0.0.1";
		try {
			host = new String(client.getZooKeeper().getData("/ringpaxos/topology" + ring + "/nodes/" + clientID,false, null));
			host = host.replaceAll("(;.*)","");
			if(client.getZooKeeper().exists("/ringpaxos/topology" + ring + "/proposers/" + clientID,false) != null){
				logger.debug("ABSender check for ring " + ring + ": OK!");
			}else{
				logger.warn("ABSender check for ring " + ring + ": Fail!");
			}			
		} catch (KeeperException | InterruptedException e) {
			logger.error(e);
		}
		logger.debug("ThriftABSender host: " + host + ":" + (9080+clientID));
		ABSender proposer = new ThriftABSender(host,9080+clientID);
		return proposer;
	}

	@Override
	public void run() {
		while(true){
			try {
				Response r = queue.take();
				List<Command> cmds = new ArrayList<Command>();
				int size = r.getCommand().getValue().length;
				cmds.add(r.getCommand());
				if(batch_size > 0){
					while((r = queue.poll(500,TimeUnit.MICROSECONDS)) != null){ 
						cmds.add(r.getCommand());
						size = size + r.getCommand().getValue().length;
						if(size >= batch_size){
							break;
						}
					}
					logger.debug("BatchSender composed #cmd " + cmds.size() + " with size " + size + " bytes.");
				}
				Message m = new Message(1,client.getIp().getHostAddress() + ";" + client.getPort(),"",cmds);
				sender.abroadcast(m);
			} catch (InterruptedException e) {
				Thread.currentThread().interrupt();
				break;				
			}
		}
	}

}