NedCommandAsync.java

/*******************************************************************************
 * Copyright (c) 2011 Nokia Corporation
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * Comarch team - initial API and implementation
 *******************************************************************************/
package org.ned.client.command;

import com.sun.lwuit.Display;
import org.ned.client.NedResources;
import org.ned.client.view.WaitingScreen;

public abstract class NedCommandAsync extends NedCommand implements Runnable {

    protected AsyncCompletedCallback callback;
    protected Object param;
    private boolean showConnectingDialog;

    public void beginAsync( Object aParam, AsyncCompletedCallback aCallback, boolean showConnectingDialog ) {
        this.param = aParam;
        this.callback = aCallback;
        this.showConnectingDialog = showConnectingDialog;
        if ( this instanceof Runnable ) {
            Thread t = new Thread( (Runnable) this );
            t.start();
        }
    }

    public void run() {
        tryShowConnecting();
        try {
            Thread.sleep( 100 );
        } catch ( InterruptedException ex ) {
        }
        try {
            execute( param );
            tryDisposeConnecting();
            if ( callback != null ) {
                callback.onSuccess();
            }
        } catch ( final Exception ex ) {
            tryDisposeConnecting();
            if ( callback != null ) {
                Display.getInstance().callSerially( new Runnable( ){

                    public void run() {
                        callback.onFailure( ex.getMessage() );
                    }
                } );
            }
        }
    }

    private void tryShowConnecting() {
        if ( showConnectingDialog ) {
            WaitingScreen.show( NedResources.CONNECTING );
        }
    }

    private void tryDisposeConnecting() {
        if ( showConnectingDialog ) {
            WaitingScreen.dispose();
        }
    }

    protected static class AsyncException extends RuntimeException {

        public AsyncException( String message ) {
            super( message );
        }
    }
}