com.ibm.as400.access.StoppableThread Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jt400 Show documentation
The Open Source version of the IBM Toolbox for Java
The newest version!
///////////////////////////////////////////////////////////////////////////////
//                                                                             
// JTOpen (AS/400 Toolbox for Java - OSS version)                              
//                                                                             
// Filename: StoppableThread.java
//                                                                             
// The source code contained herein is licensed under the IBM Public License   
// Version 1.0, which has been approved by the Open Source Initiative.         
// Copyright (C) 1997-2000 International Business Machines Corporation and     
// others. All rights reserved.                                                
//                                                                             
///////////////////////////////////////////////////////////////////////////////

package com.ibm.as400.access;



/**
The StoppableThread class represents a thread
that can be safely stopped.  See the JDK 1.2 
documentation for Thread.stop() to see why 
this is necessary.
**/
abstract class StoppableThread
extends Thread 
{
  public static final String copyright = "Copyright (C) 1997-2000 International Business Machines Corporation and others.";



    


    // Private data.

    private boolean     continue_   = true;

    private static Object   countLock_  = new Object();
    private static int      count_      = 0;



    protected StoppableThread ()
    {
        this("Stoppable-Thread-" + newId());
    }



    protected StoppableThread(String name)
    {
        super(name);

        if (Trace.isTraceInformationOn())
          Trace.log(Trace.INFORMATION, "Thread:start:" + getName() + "(" + getClass() + ").");
    }



/**
Indicates if the thread can continue.
**/
    protected boolean canContinue ()
    {
        return continue_;
    }



    protected static long newId()
    {
        synchronized(countLock_) {
            return ++count_;
        }
    }



/**
Stops the thread safely.
**/
    public void stopSafely ()
    {
        if (Trace.isTraceInformationOn())
            Trace.log(Trace.INFORMATION, "Thread:stop:" + getName() + "(" + getClass() + ").");

        continue_ = false;
    }


    public boolean wasStoppedSafely()
    {
        return (continue_ == false);
    }


}