com.pi4j.gpio.extension.serial.SerialCommandQueueProcessingThread Maven / Gradle / Ivy
package com.pi4j.gpio.extension.serial;
/*
* #%L
* **********************************************************************
* ORGANIZATION : Pi4J
* PROJECT : Pi4J :: GPIO Extension
* FILENAME : SerialCommandQueueProcessingThread.java
*
* This file is part of the Pi4J project. More information about
* this project can be found here: http://www.pi4j.com/
* **********************************************************************
* %%
* Copyright (C) 2012 - 2015 Pi4J
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
import java.util.concurrent.LinkedTransferQueue;
import com.pi4j.io.serial.Serial;
public class SerialCommandQueueProcessingThread extends Thread {
public static final int DEAFULT_DELAY = 100; // milliseconds
private boolean exiting = false;
private final Serial serial;
private final int delay;
private final LinkedTransferQueue queue = new LinkedTransferQueue();
public SerialCommandQueueProcessingThread(Serial serial, int delay) {
this.serial = serial;
this.delay = delay;
}
public SerialCommandQueueProcessingThread(Serial serial) {
this(serial, DEAFULT_DELAY);
}
/**
*
* Exit the monitoring thread.
*
*/
public synchronized void shutdown() {
exiting = true;
}
/**
*
* Exit the monitoring thread.
*
*/
public void put(String data) {
queue.add(data);
}
/**
*
* This method is called when this monitoring thread starts
*
*/
public void run() {
while (!exiting) {
if (!queue.isEmpty()) {
// wait for a small interval before attempting next transmission
try {
String data = queue.take();
if (serial.isOpen()) {
serial.write(data);
serial.flush();
}
Thread.sleep(delay);
} catch (InterruptedException e) {
//e.printStackTrace();
}
}
}
}
}