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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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package com.sun.grizzly;

import com.sun.grizzly.tcp.PendingIOhandler;
import com.sun.grizzly.util.State;
import com.sun.grizzly.util.StateHolder;
import com.sun.grizzly.util.StateHolder.ConditionListener;
import com.sun.grizzly.util.WorkerThreadImpl;
import java.nio.channels.SelectionKey;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

/**
 * Class is responsible for processing certain (single)
 * {@link SelectorHandler}
 * 
 * @author Alexey Stashok
 */
public class SelectorHandlerRunner implements Runnable {

    private final SelectorHandler selectorHandler;
    private final Controller controller;
    
    public SelectorHandlerRunner(Controller controller, SelectorHandler selectorHandler) {
        this.controller = controller;
        this.selectorHandler = selectorHandler;
    }
    
    public SelectorHandler getSelectorHandler() {
        return selectorHandler;
    }
    
    public void run() {
        
        ((WorkerThreadImpl)Thread.currentThread()).setPendingIOhandler(selectorHandler);

        NIOContext serverCtx = controller.pollContext(null,null);
        serverCtx.setSelectorHandler(selectorHandler);

        StateHolder controllerStateHolder = controller.getStateHolder();
        StateHolder selectorHandlerStateHolder = selectorHandler.getStateHolder();
        
        try {
            selectorHandler.getStateHolder().setState(State.STARTED);

            State controllerState;
            State selectorHandlerState;
            while ((controllerState = controllerStateHolder.getState(false)) != State.STOPPED &&
                    (selectorHandlerState = selectorHandlerStateHolder.getState(false)) != State.STOPPED) {
                
                if (controllerState != State.PAUSED &&
                        selectorHandlerState != State.PAUSED) {
                    controller.doSelect(selectorHandler,serverCtx);
                } else {
                    doSelectorPaused(controllerState, selectorHandlerState);
                }
            }
        } finally {
            selectorHandler.shutdown();
            controller.notifyStopped();
        }
    }
    
    /**
     * handle Selector paused state
     */
    private void doSelectorPaused(State controllerState, State selectorHandlerState){
        CountDownLatch latch = new CountDownLatch(1);
        ConditionListener controllerConditionListener =
                registerForNotification(controllerState,
                controller.getStateHolder(), latch);
        ConditionListener selectorHandlerConditionListener =
                registerForNotification(selectorHandlerState,
                 selectorHandler.getStateHolder(), latch);

        try {
            latch.await(5000, TimeUnit.MILLISECONDS);
        } catch(InterruptedException e) {
        } finally {
            controller.getStateHolder().removeConditionListener(controllerConditionListener);
            selectorHandler.getStateHolder().removeConditionListener(selectorHandlerConditionListener);
        }
    }

    /**
     * Register CountDownLatch to be notified, when either Controller
     * or SelectorHandler will change their state to correspondent values
     * @param currentState initial/current {@link StateHolder} state
     * @param stateHolder
     * @param latch
     * @return ConditionListener if listener is registered, null if
     *        condition is true right now
     */
    private ConditionListener registerForNotification(State currentState, 
            StateHolder stateHolder, CountDownLatch latch) {
        if (currentState == State.PAUSED) {
            return stateHolder.notifyWhenStateIsNotEqual(State.PAUSED, latch);
        } else {
            return stateHolder.notifyWhenStateIsEqual(State.STOPPED, latch);
        }
    }
}