/*

* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

package javax.microedition.lcdui;

/**

 * Condition variable used to track completion of asynchronous

 * requests to the server.

 */

class AsyncCall

{

    private static final int KRequestPending = 0x80000000;

    /**

     * Limit of wait in waitForRequest().

     * 1/25s is close to human persistance of vision, so

     * users probably won't notice the glitch.

     *

     * See comment in waitForRequest().

     */

    private static final long TIMEOUT = 40; // == 1/25 second

    private int     iStatus;

    private int     iWaiting;

    public AsyncCall()

    {

    }

    public final synchronized void request()

    {

        iStatus = KRequestPending;

    }

    public final synchronized void complete(int aStatus)

    {

        iStatus = aStatus;

        if (iWaiting > 0)

        {

            notifyAll();

        }

    }

    public final boolean isPending()

    {

        return (iStatus == KRequestPending);

    }

    public final synchronized int waitForRequest()

    {

        while (isPending())

        {

            ++iWaiting;

            try

            {

                wait(TIMEOUT);

            }

            catch (InterruptedException e)

            {

                e.printStackTrace();

            }

            --iWaiting;

        }

        return iStatus;

    }

}