PriorityQueueThread.java

/**
 * Copyright (c) 2010-2015, openHAB.org and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package com.myhome.fcrisciani.queue;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.myhome.fcrisciani.connector.MyHomeJavaConnector;
import com.myhome.fcrisciani.connector.MyHomeSocketFactory;

/**
 * This thread extract new command from the priority queue and send them on the
 * Plant. Between each one it put a 300ms of delay to assure the correct
 * execution on the plant. If there is no available command it suspends on the
 * priority queue semaphore.
 *
 * @author Flavio Crisciani
 * @serial 1.0
 * @since 1.7.0
 */
public class PriorityQueueThread implements Runnable {

    private static final Logger logger = LoggerFactory.getLogger(PriorityQueueThread.class);

    // ----- TYPES ----- //

    // ---- MEMBERS ---- //
    MyHomeJavaConnector myConnector = null;
    PriorityCommandQueue list = null;
    Socket sk = null;
    PrintWriter output = null;

    // ---- METHODS ---- //
    private void closeSocket() {
        if (output != null) {
            output.close();
            output = null;
        }
        if (sk != null) {
            try {
                MyHomeSocketFactory.disconnect(sk);
            } catch (IOException e) {
                System.err.println("PriorityQueueThread: Problem during connection closure - " + e.toString());
                e.printStackTrace();
            }
            sk = null;
        }
    }

    /**
     * Create the Priority Queue Thread giving the reference to the MyHome
     * connector and the Priority queue
     * 
     * @param myConnector
     *            myhome connector used only for IP, port read
     * @param list
     *            priority queue to handle
     */
    public PriorityQueueThread(final MyHomeJavaConnector myConnector, final PriorityCommandQueue list) {
        this.myConnector = myConnector;
        this.list = list;
    }

    public void run() {
        String tosend = null;
        do {
            try {
                tosend = list.getCommand();
                logger.info("OpenWebNet CMD [" + tosend + "]");
                if (sk == null) { // Create a new command session
                    try {
                        sk = MyHomeSocketFactory.openCommandSession(myConnector.ip, myConnector.port);
                    } catch (IOException e) {
                        System.err.println(
                                "PriorityQueueThread: Problem during socket monitor opening - " + e.toString());
                        continue;
                    }
                }
                try {
                    if (output == null) {
                        output = new PrintWriter(sk.getOutputStream());
                    }
                    output.write(tosend);
                    output.flush();
                } catch (IOException e) {
                    System.err.println("PriorityQueueThread: Problem during command sending - " + e.toString());
                    closeSocket();
                    continue;
                }
                try {
                    Thread.sleep(300); // Wait 300ms to be sure that command
                                       // sent had been executed
                } catch (InterruptedException e) {
                    System.err.println("PriorityQueueThread: Problem during suspension - " + e.toString());
                    continue;
                }
                if (list.numCommands() == 0) { // There are no more message to
                                               // handle close command session
                    closeSocket();
                }
            } catch (Exception e) {
                System.err.println("PriorityQueueThread: Not handled exception - " + e.toString());
                closeSocket();
            }
        } while (true);
    }

}