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 package com.sun.grizzly;

 import com.sun.grizzly.util.State;

 import com.sun.grizzly.util.StateHolder;

 import com.sun.grizzly.util.StateHolder.ConditionListener;

 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() {

         StateHolder<State> controllerStateHolder = controller.getStateHolder();

         StateHolder<State> selectorHandlerStateHolder = selectorHandler.getStateHolder();

         try {

             selectorHandler.getStateHolder().setState(State.STARTED);

             while (controllerStateHolder.getState(false) != State.STOPPED &&

                     selectorHandlerStateHolder.getState(false) != State.STOPPED) {

                 State controllerState = controllerStateHolder.getState(false);

                 State selectorHandlerState = selectorHandlerStateHolder.getState(false);

                 if (controllerState != State.PAUSED &&

                         selectorHandlerState != State.PAUSED) {

                     controller.doSelect(selectorHandler);

                 } else {

                     CountDownLatch latch = new CountDownLatch(1);

                     ConditionListener<State> controllerConditionListener = 

                             registerForNotification(controllerState, 

                             controllerStateHolder, latch);

                     ConditionListener<State> selectorHandlerConditionListener = 

                             registerForNotification(selectorHandlerState, 

                             selectorHandlerStateHolder, latch);

                     try {

                         latch.await(5000, TimeUnit.MILLISECONDS);

                     } catch(InterruptedException e) {

                     } finally {

                         controllerStateHolder.removeConditionListener(controllerConditionListener);

                         selectorHandlerStateHolder.removeConditionListener(selectorHandlerConditionListener);

                     }

                 }

             }

         } finally {

             selectorHandler.shutdown();

             controller.notifyStopped();

         }

     }

     /**

      * Register <code>CountDownLatch</code> 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 <code>ConditionListener</code> if listener is registered, null if

      *        condition is true right now

      */

     private ConditionListener<State> registerForNotification(State currentState, 

             StateHolder<State> stateHolder, CountDownLatch latch) {

         if (currentState == State.PAUSED) {

             return stateHolder.notifyWhenStateIsNotEqual(State.PAUSED, latch);

         } else {

             return stateHolder.notifyWhenStateIsEqual(State.STOPPED, latch);

         }

     }

 }