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package pl.fones.blog.asynctest;

/**
 * Sample class which call notification callbacks.
 * 
 * @author Wojciech Grzeskowiak
 * @date 2010/05/11
 * @version 1.0
 * @link http://blog.fones.pl
 */
public class Engine {
    
    // Notification interface.
    private EngineNotifications notifier;
    
    /**
     * Setting notification interface.
     * @param callbacks Notification interface.
     */
    public void setNotifier(EngineNotifications notifier) {
        this.notifier = notifier;
    }
    
    /**
     * Start engine. Callback in EngineNotifications.engineStart() callback.
     * @return True if conditions true, false in other way.
     * @throws Exception when notification interface is not set.
     */
    public boolean start() throws IllegalStateException {
        
        // Checking conditions.
        if (notifier == null) {
            throw new IllegalStateException("Notification interface not set!");
        }
        
        // Creating background thread.
        final Runnable callbackTask = new Runnable() {
            public void run() {

                // Do something...
                try {
                    synchronized (this) {
                        this.wait(1000);
                    }
                } 
                catch (InterruptedException e) {
                    // Interrupting engine cannot start.
                    notifier.engineStart(false);
                    return;
                }
                
                // Engine started.
                notifier.engineStart(true);
                return;
            }
        };
        
        // Starting thread.
        final Thread engineThread = new Thread(callbackTask);
        engineThread.start();
        
        // Finish operation.
        return true;
    } 
}