msgsender.java

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/**
 *  Concurrency utilities (JSR-166) example
 **/
package queue;

import java.net.*;
import java.io.*;
import java.util.concurrent.*;

/**
 *  Send messages to a Logger via a BlockingQueue
 **/
public class MsgSender implements Runnable {
  private BlockingQueue<String> messageQueue;
  private int id;
  private int count;
  private long pause;

  /**
   *  Constructor
   *
   * @param messageQueue The quese to send messages to
   * @param id The ID number of this sender
   * @param count The number of messages to send
   * @param pause The pause between sending each message
   **/
  public MsgSender(BlockingQueue<String> messageQueue, int id,
      int count, long pause) {
    this.messageQueue = messageQueue;
    this.id = id;
    this.count = count;
    this.pause = pause;
  }

  /**
   *  Run method to send the messages
   **/
  public void run() {
    try {
      for (int i = 0; i < count; i++) {
        messageQueue.put("ID " + id + ": log message number " + i);
        Thread.sleep(pause);
      }
    } catch (InterruptedException ie) {
      //  Ignore
    }
  }

  /**
   *  Main entry point for running test scenario
   *
   * @param args The command line arguments
   **/
  public static void main(String[] args) {
    /*  For the test we will need a BlockingQueue to be used by both threads
     *  Initially use an ArrayBlockingQueue which is the simplest concrete 
     *  implementation of the BlockingQueue interface.  The constructor takes
     *  the size of the queue as a parameter
     */
    ArrayBlockingQueue<String> queue = new ArrayBlockingQueue<String>(10);

    /*  Use the utility method from the Executors class to get an
     *  ExcutorService reference that will allow us to execute a single
     *  thread
     */
    ExecutorService loggerExecutor = Executors.newSingleThreadExecutor();
    loggerExecutor.execute(new Logger(queue));

    /*  Again use the utility Executors class to get a new ExecutorService 
     *  for a second new thread and pass a MsgSender instance to it to run
     */
    ExecutorService senderExecutor = Executors.newSingleThreadExecutor();
    senderExecutor.execute(new MsgSender(queue, 1, 10, 500));
  }
}