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package com.sun.grizzly.asyncqueue;

import java.util.Collection;
import com.sun.grizzly.Connection;
import com.sun.grizzly.IOEvent;
import com.sun.grizzly.Processor;
import com.sun.grizzly.ProcessorSelector;

/**
 * The {@link ProcessorSelector} implementation, which is aware of
 * Connection asynchronous read/write queues, and is responsible
 * for adding corresponding {@link Processor}.
 * 
 * @author Alexey Stashok
 */
public class AsyncQueueProcessorSelector implements ProcessorSelector {
    protected AsyncQueueEnabledTransport transport;

    public AsyncQueueProcessorSelector(AsyncQueueEnabledTransport transport) {
        this.transport = transport;
    }

    /**
     * Returns asynchronous queue {@link Processor} if required

     *
     * @param ioEvent connection event to be processed
     * @param connection, where event occured
     * @param processorChain {@link Collection}, where
     *          additional {@link Processor}(s) will be added
     *
     * @return the {@link InjectionResult}, which defines whether
     *         {@link ProcessorSelector} should stop the injection of a
     *         next Processors, or can continue.
     */
     public Processor select(IOEvent ioEvent,
            Connection connection) {
        AsyncQueueProcessor asyncQueueProcessor;

        if (ioEvent == IOEvent.WRITE) {
            asyncQueueProcessor = transport.getAsyncQueueIO().getWriter();
        } else if (ioEvent == IOEvent.READ) {
            asyncQueueProcessor = transport.getAsyncQueueIO().getReader();
        } else {
            asyncQueueProcessor = null;
        }

        if (asyncQueueProcessor != null &&
                asyncQueueProcessor.isReady(connection)) {
            return asyncQueueProcessor;
        }

        return null;
    }

}