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//
// Nexus Core - a framework for developing distributed applications
// http://github.com/threerings/nexus/blob/master/LICENSE

package com.threerings.nexus.util;

/**
 * Used to communicate asynchronous results.
 */
public interface Callback
{
    /** A callback that chains failure to the supplied delegate callback. */
    public static abstract class Chain implements Callback {
        public Chain (Callback onFailure) {
            _onFailure = onFailure;
        }
        public void onFailure (Throwable cause) {
            _onFailure.onFailure(cause);
        }
        protected Callback _onFailure;
    }

    /** A callback that does nothing, including nothing in the event of failure. Don't use this if
     * doing so will result in the suppression of errors! */
    public static final Callback NOOP = new Callback() {
        @Override public void onSuccess (Object result) {} // noop!
        @Override public void onFailure (Throwable cause) {} // noop!
    };

    /**
     * Called when the asynchronous request succeeded, supplying its result.
     */
    void onSuccess (T result);

    /**
     * Called when the asynchronous request failed, supplying a cause for failure.
     */
    void onFailure (Throwable cause);
}
    

    

    

            

    

            



    
    






    
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