/*
    *  Licensed to the Apache Software Foundation (ASF) under one
    *  or more contributor license agreements.  See the NOTICE file
    *  distributed with this work for additional information
    *  regarding copyright ownership.  The ASF licenses this file
    *  to you under the Apache License, Version 2.0 (the
    *  "License"); you may not use this file except in compliance
    *  with the License.  You may obtain a copy of the License at
    *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   *  Unless required by applicable law or agreed to in writing,
   *  software distributed under the License is distributed on an
   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   *  KIND, either express or implied.  See the License for the
   *  specific language governing permissions and limitations
   *  under the License.
   *
   */
  package org.apache.mina.filter.executor;
  
  import static org.junit.Assert.assertEquals;
  
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.mina.core.filterchain.IoFilter.NextFilter;
  import org.apache.mina.core.session.DummySession;
  import org.apache.mina.core.session.IdleStatus;
  import org.apache.mina.core.session.IoSession;
  import org.apache.mina.core.write.WriteRequest;
  import org.apache.mina.filter.FilterEvent;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  /**
   * TODO Add documentation
   * 
   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
   */
  public class ExecutorFilterRegressionTest {
      private ExecutorFilter filter;
  
      public ExecutorFilterRegressionTest() {
          // Do nothing
      }
  
      @Before
      public void setUp() throws Exception {
          filter = new ExecutorFilter(8);
      }
  
      @After
      public void tearDown() throws Exception {
          ((ExecutorService) filter.getExecutor()).shutdown();
          filter = null;
      }
  
      @Test
      public void testEventOrder() throws Throwable {
          final EventOrderChecker nextFilter = new EventOrderChecker();
          final EventOrderCounter[] sessions = new EventOrderCounter[] { new EventOrderCounter(),
                  new EventOrderCounter(), new EventOrderCounter(), new EventOrderCounter(), new EventOrderCounter(),
                  new EventOrderCounter(), new EventOrderCounter(), new EventOrderCounter(), new EventOrderCounter(),
                  new EventOrderCounter(), };
          final int loop = 1000000;
          final int end = sessions.length - 1;
          final ExecutorFilter filter = this.filter;
          ExecutorService executor = (ExecutorService) filter.getExecutor();
          //executor.setKeepAliveTime(3, TimeUnit.SECONDS);
  
          for (int i = 0; i < loop; i++) {
              Integer objI = new Integer(i);
  
              for (int j = end; j >= 0; j--) {
                  filter.messageReceived(nextFilter, sessions[j], objI);
              }
  
              if (nextFilter.throwable != null) {
                  throw nextFilter.throwable;
              }
          }
  
          executor.shutdown();
          executor.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
  
          for (int i = end; i >= 0; i--) {
              assertEquals(loop - 1, sessions[i].lastCount.intValue());
          }
      }
  
      private static class EventOrderCounter extends DummySession {
          Integer lastCount = null;
  
          /**
           * Default constructor
           */
          public EventOrderCounter() {
             super();
         }
 
         public synchronized void setLastCount(Integer newCount) {
             if (lastCount != null) {
                 assertEquals(lastCount.intValue() + 1, newCount.intValue());
             }
 
             lastCount = newCount;
         }
     }
 
     private static class EventOrderChecker implements NextFilter {
         Throwable throwable;
 
         /**
          * Default constructor
          */
         public EventOrderChecker() {
             super();
         }
 
         public void sessionOpened(IoSession session) {
             // Do nothing
         }
 
         public void sessionClosed(IoSession session) {
             // Do nothing
         }
 
         public void sessionIdle(IoSession session, IdleStatus status) {
             // Do nothing
         }
 
         public void exceptionCaught(IoSession session, Throwable cause) {
             // Do nothing
         }
 
         public void inputClosed(IoSession session) {
             // Do nothing
         }
 
         public void messageReceived(IoSession session, Object message) {
             try {
                 ((EventOrderCounter) session).setLastCount((Integer) message);
             } catch (Exception e) {
                 if (this.throwable == null) {
                     this.throwable = e;
                 }
             }
         }
 
         public void messageSent(IoSession session, WriteRequest writeRequest) {
             // Do nothing
         }
 
         public void filterWrite(IoSession session, WriteRequest writeRequest) {
             // Do nothing
         }
 
         public void filterClose(IoSession session) {
             // Do nothing
         }
 
         public void sessionCreated(IoSession session) {
             // Do nothing
         }
         
         public void event(IoSession session, FilterEvent event) {
             // Do nothing
         }
     }
 }