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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2008-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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package com.sun.grizzly.http;

import com.sun.grizzly.Context;
import com.sun.grizzly.DefaultProtocolChain;
import com.sun.grizzly.rcm.ResourceAllocationFilter;
import com.sun.grizzly.util.WorkerThread;
import java.nio.ByteBuffer;

/**
 * Customized implementation of a {@link ProtocolChain}
 * @author Jeanfrancois Arcand
 */
public class HttpProtocolChain extends DefaultProtocolChain {

    // is RCM enabled.
    private boolean rcmSupport = false;

    /**
     * Execute the request. When RCM is enabled, swicth the {@link ByteBuffer}
     * based on the decision made by a {@link ResourceAllocationFilter}
     * @param ctx
     * @throws java.lang.Exception
     */
    @Override
    public void execute(Context ctx) throws Exception {
        if (rcmSupport) {
            ByteBuffer byteBuffer =
                    (ByteBuffer) ctx.getAttribute(ResourceAllocationFilter.BYTE_BUFFER);
            // Switch ByteBuffer
            if (byteBuffer != null) {
                ((WorkerThread) Thread.currentThread()).setByteBuffer(byteBuffer);
            }

            if (!protocolFilters.isEmpty()) {
                int currentPosition = super.executeProtocolFilter(ctx);
                super.postExecuteProtocolFilter(currentPosition, ctx);
            }
        } else {
            super.execute(ctx);
        }
    }

    /**
     * Enable/Disable RCM.
     * @param rcmSupport
     */
    public void enableRCM(boolean rcmSupport) {
        this.rcmSupport = rcmSupport;
    }
}