com.sun.grizzly.suspendable.SuspendableContextTask Maven / Gradle / Ivy

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package com.sun.grizzly.suspendable;

import com.sun.grizzly.DefaultProtocolChain;
import com.sun.grizzly.SelectionKeyContextTask;
import com.sun.grizzly.util.ThreadAttachment;
import com.sun.grizzly.util.WorkerThread;

/**
 * Simple ContextTask used to resume a {@link ProtocolChain} execution 
 * when the {@link SuspendableFilter} is used. 
 * 
 * @author Jeanfrancois Arcand
 */
class SuspendableContextTask extends SelectionKeyContextTask {

    protected final DefaultProtocolChain protocolChain;
    protected final int filterStart;
    protected final ThreadAttachment threadAttachment;

    public SuspendableContextTask(DefaultProtocolChain pc,
            ThreadAttachment threadAttachment, int filterStart) {
        this.protocolChain    = pc;
        this.filterStart      = filterStart;
        this.threadAttachment = threadAttachment;
    }
    
    /**
     * Resume the ProtocolChain at positon {@link #filterStart}
     * @return null
     * @throws java.lang.Exception
     */
    protected Object doCall() throws Exception {
        ((WorkerThread) Thread.currentThread()).attach(threadAttachment);
        protocolChain.setContinuousExecution(false);
        protocolChain.execute(context, filterStart);
        protocolChain.setContinuousExecution(true);
        return null;
    }
}