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 package com.sun.grizzly;

 import java.nio.channels.SelectionKey;

 /**

  * Basic class for all {@link ContextTask}s, which are dealing with

  * {@link SelectionKey}s

  * 

  * @author Alexey Stashok

  */

 public abstract class SelectionKeyContextTask extends ContextTask {

     public final Object call() throws Exception {

         Object result = null;

         beforeCall();

         try {

             result = doCall();

         } finally {

             try {

                 afterCall();

             } catch(Exception e) {

                 e.printStackTrace();

             }

             offer();

         }

         return result;

     }

     protected void beforeCall() {

         SelectionKey currentKey = context.getSelectionKey();

         SelectionKeyHandler selectionKeyHandler = context.

                 getSelectorHandler().getSelectionKeyHandler();

         selectionKeyHandler.process(currentKey);

     }

     protected void afterCall() {

         SelectionKey currentKey = context.getSelectionKey();

         SelectionKeyHandler selectionKeyHandler = context.

                 getSelectorHandler().getSelectionKeyHandler();

         selectionKeyHandler.postProcess(currentKey);

     }

     protected abstract Object doCall() throws Exception;

 }