org.glassfish.grizzly.utils.CompletionHandlerAdapter Maven / Gradle / Ivy

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 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.grizzly.utils;

import org.glassfish.grizzly.CompletionHandler;
import org.glassfish.grizzly.impl.FutureImpl;

/**
 *
 * @author Alexey Stashok
 */
public class CompletionHandlerAdapter
        implements CompletionHandler {

    private final static GenericAdapter DIRECT_ADAPTER = new GenericAdapter() {
        @Override
        public Object adapt(final Object result) {
            return result;
        }
    };

    private final GenericAdapter adapter;
    private final FutureImpl future;
    private final CompletionHandler completionHandler;

    public CompletionHandlerAdapter(FutureImpl future) {
        this(future, null);
    }

    public CompletionHandlerAdapter(FutureImpl future,
            CompletionHandler completionHandler) {
        this(future, completionHandler, null);
    }

    public CompletionHandlerAdapter(FutureImpl future,
            CompletionHandler completionHandler,
            GenericAdapter adapter) {
        this.future = future;
        this.completionHandler = completionHandler;
        if (adapter != null) {
            this.adapter = adapter;
        } else {
            this.adapter = getDirectAdapter();
        }
    }


    @Override
    public void cancelled() {
        if (completionHandler != null) {
            completionHandler.cancelled();
        }
        
        if (future != null) {
            future.cancel(false);            
        }        
    }

    @Override
    public void failed(Throwable throwable) {
        if (completionHandler != null) {
            completionHandler.failed(throwable);
        }
        
        if (future != null) {
            future.failure(throwable);
        }
    }

    @Override
    public void completed(B result) {
        final A adaptedResult = adapt(result);

        if (completionHandler != null) {
            completionHandler.completed(adaptedResult);
        }
        
        if (future != null) {
            future.result(adaptedResult);
        }        
    }

    @Override
    public void updated(B result) {
        final A adaptedResult = adapt(result);

        if (completionHandler != null) {
            completionHandler.updated(adaptedResult);
        }
    }

    protected A adapt(B result) {
        return adapter.adapt(result);
    }
    
    @SuppressWarnings("unchecked")
    private static  GenericAdapter getDirectAdapter() {
        return DIRECT_ADAPTER;
    }
}