org.directwebremoting.impl.ThreadWaitSleeper Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of dwr Show documentation

DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

The newest version!

package org.directwebremoting.impl;

import java.io.IOException;

import jakarta.servlet.http.HttpServletResponse;

import org.directwebremoting.extend.RealScriptSession;
import org.directwebremoting.extend.ScriptConduit;

/**
 * The simplest type of Sleeper that just uses {@link #wait()} and
 * {@link #notify()} to block a thread.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 * @author Mike Wilson
 */
public class ThreadWaitSleeper extends BaseSleeper
{
    public ThreadWaitSleeper(final HttpServletResponse response, final RealScriptSession scriptSession, final ScriptConduit conduit) throws IOException
    {
        super(response, scriptSession, conduit);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.impl.BaseSleeper#enterSleep()
     */
    @Override
    protected void enterSleep()
    {
        while(true) {
            synchronized (lock) {
                while(!awaken && !closed) {
                    try {
                        lock.wait();
                    } catch (InterruptedException ex) {
                        closed = true;
                    }
                }
                if (closed) {
                    break;
                }
                awaken = false;
            }
            doWork();
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.impl.BaseSleeper#wakeUp()
     */
    @Override
    protected void wakeUp()
    {
        synchronized (lock) {
            awaken = true;
            lock.notify();
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.impl.BaseSleeper#close()
     */
    @Override
    protected void close()
    {
        synchronized (lock) {
            closed = true;
            lock.notify();
        }
    }

    // Internal state
    private final Object lock = new Object();
    private boolean awaken = false;
    private boolean closed = false;
}