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package com.sun.grizzly.tcp;

import com.sun.grizzly.tcp.Response.ResponseAttachment;
import com.sun.grizzly.util.SelectionKeyAttachment;
import com.sun.grizzly.util.ThreadAttachment;
import com.sun.grizzly.util.WorkerThread;
import java.nio.channels.SelectionKey;

/**
 * Utility class, which implements general response suspension funtionality.
 * 
 * @author Alexey Stashok
 */
public class SuspendResponseUtils {
    private static final String SUSPENDED_RESPONSE_ATTR = "SuspendedResponse";
    
    public static void attach(SelectionKey selectionKey,
            Response.ResponseAttachment suspendedResponse) {
        Object attachment = selectionKey.attachment();
        if (attachment == null || !(attachment instanceof ThreadAttachment)) {
            attachment = obtainThreadAttachment();
            selectionKey.attach(attachment);
        }

        final ThreadAttachment threadAttachment = (ThreadAttachment) attachment;
        suspendedResponse.setThreadAttachment(threadAttachment);
        suspendedResponse.resetTimeout();

        threadAttachment.setIdleTimeoutDelay(suspendedResponse.getIdleTimeoutDelay());
        threadAttachment.setTimeoutListener(suspendedResponse);
        threadAttachment.setKeySelectionListener(suspendedResponse);
        threadAttachment.setAttribute(SUSPENDED_RESPONSE_ATTR, suspendedResponse);
    }

    public static void detach(SelectionKey selectionKey) {
        final Object attachment = selectionKey.attachment();
        if (attachment != null && attachment instanceof ThreadAttachment) {
            final ThreadAttachment threadAttachment = (ThreadAttachment) attachment;
            threadAttachment.removeAttribute(SUSPENDED_RESPONSE_ATTR);
            threadAttachment.setIdleTimeoutDelay(SelectionKeyAttachment.UNLIMITED_TIMEOUT);
            threadAttachment.setTimeoutListener(null);
            threadAttachment.setKeySelectionListener(null);
        }
    }

    public static Response.ResponseAttachment get(SelectionKey selectionKey) {
        final Object attachment = selectionKey.attachment();
        if (attachment != null && attachment instanceof ThreadAttachment) {
            return (ResponseAttachment) ((ThreadAttachment) attachment).getAttribute(SUSPENDED_RESPONSE_ATTR);
        }
        
        return null;
    }

    private static ThreadAttachment obtainThreadAttachment() {
        final Thread currentThread = Thread.currentThread();
        if (currentThread instanceof WorkerThread) {
            return ((WorkerThread) currentThread).getAttachment();
        }

        return new ThreadAttachment();
    }
}