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    *  to you under the Apache License, Version 2.0 (the
    *  "License"); you may not use this file except in compliance
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   *    http://www.apache.org/licenses/LICENSE-2.0
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  package org.apache.mina.transport;
  
  import java.io.IOException;
  import java.net.SocketAddress;
  import java.util.Collection;
  import java.util.Date;
  
  import junit.framework.Assert;
  import junit.framework.TestCase;
  
  import org.apache.mina.core.buffer.IoBuffer;
  import org.apache.mina.core.future.ConnectFuture;
  import org.apache.mina.core.service.IoAcceptor;
  import org.apache.mina.core.service.IoConnector;
  import org.apache.mina.core.service.IoHandlerAdapter;
  import org.apache.mina.core.session.IdleStatus;
  import org.apache.mina.core.session.IoSession;
  import org.apache.mina.transport.socket.DatagramAcceptor;
  import org.apache.mina.transport.socket.DatagramSessionConfig;
  import org.apache.mina.transport.socket.SocketAcceptor;
  import org.apache.mina.transport.socket.SocketSessionConfig;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Tests {@link IoAcceptor} resource leakage by repeating bind and unbind.
   *
   * @author The Apache MINA Project (dev@mina.apache.org)
   * @version $Rev: 671827 $, $Date: 2008-06-26 10:49:48 +0200 (jeu, 26 jun 2008) $
   */
  public abstract class AbstractBindTest extends TestCase {
      protected final IoAcceptor acceptor;
  
      protected int port;
  
      public AbstractBindTest(IoAcceptor acceptor) {
          this.acceptor = acceptor;
      }
  
      protected abstract SocketAddress createSocketAddress(int port);
  
      protected abstract int getPort(SocketAddress address);
  
      protected abstract IoConnector newConnector();
  
      protected void bind(boolean reuseAddress) throws IOException {
          acceptor.setHandler(new EchoProtocolHandler());
  
          setReuseAddress(reuseAddress);
  
          // Find an available test port and bind to it.
          boolean socketBound = false;
  
          // Let's start from port #1 to detect possible resource leak
          // because test will fail in port 1-1023 if user run this test
          // as a normal user.
          for (port = 1; port <= 65535; port++) {
              socketBound = false;
              try {
                  acceptor.setDefaultLocalAddress(createSocketAddress(port));
                  acceptor.bind();
                  socketBound = true;
                  break;
              } catch (IOException e) {
                  //System.out.println(e.getMessage());
              }
          }
  
          // If there is no port available, test fails.
          if (!socketBound) {
              throw new IOException("Cannot bind any test port.");
          }
  
          //System.out.println( "Using port " + port + " for testing." );
      }
  
      private void setReuseAddress(boolean reuseAddress) {
          if (acceptor instanceof DatagramAcceptor) {
              ((DatagramSessionConfig) acceptor.getSessionConfig())
                      .setReuseAddress(reuseAddress);
         } else if (acceptor instanceof SocketAcceptor) {
             ((SocketAcceptor) acceptor).setReuseAddress(reuseAddress);
         }
     }
 
     @Override
     public void tearDown() {
         try {
             acceptor.dispose();
         } catch (Exception e) {
             // ignore
         }
 
         acceptor.setDefaultLocalAddress(null);
     }
 
     public void testAnonymousBind() throws Exception {
         acceptor.setHandler(new IoHandlerAdapter());
         acceptor.setDefaultLocalAddress(null);
         acceptor.bind();
         Assert.assertNotNull(acceptor.getLocalAddress());
         acceptor.unbind(acceptor.getLocalAddress());
         Assert.assertNull(acceptor.getLocalAddress());
         acceptor.setDefaultLocalAddress(createSocketAddress(0));
         acceptor.bind();
         Assert.assertNotNull(acceptor.getLocalAddress());
         Assert.assertTrue(getPort(acceptor.getLocalAddress()) != 0);
         acceptor.unbind(acceptor.getLocalAddress());
     }
 
     public void testDuplicateBind() throws IOException {
         bind(false);
 
         try {
             acceptor.bind();
             Assert.fail("Exception is not thrown");
         } catch (Exception e) {
         }
     }
 
     public void testDuplicateUnbind() throws IOException {
         bind(false);
 
         // this should succeed
         acceptor.unbind();
 
         // this shouldn't fail
         acceptor.unbind();
     }
 
     public void testManyTimes() throws IOException {
         bind(true);
 
         for (int i = 0; i < 1024; i++) {
             acceptor.unbind();
             acceptor.bind();
         }
     }
 
     public void testUnbindDisconnectsClients() throws Exception {
         bind(true);
         IoConnector connector = newConnector();
         IoSession[] sessions = new IoSession[5];
         connector.setHandler(new IoHandlerAdapter());
         for (int i = 0; i < sessions.length; i++) {
             ConnectFuture future = connector.connect(createSocketAddress(port));
             future.awaitUninterruptibly();
             sessions[i] = future.getSession();
             Assert.assertTrue(sessions[i].isConnected());
             Assert.assertTrue(sessions[i].write(IoBuffer.allocate(1)).awaitUninterruptibly().isWritten());
         }
 
         // Wait for the server side sessions to be created.
         Thread.sleep(500);
 
         Collection<IoSession> managedSessions = acceptor.getManagedSessions().values();
         Assert.assertEquals(5, managedSessions.size());
 
         acceptor.unbind();
 
         // Wait for the client side sessions to close.
         Thread.sleep(500);
 
         Assert.assertEquals(0, managedSessions.size());
         for (IoSession element : managedSessions) {
             Assert.assertFalse(element.isConnected());
         }
     }
 
     public void _testRegressively() throws IOException {
         setReuseAddress(true);
 
         SocketAddress addr = createSocketAddress(port);
         EchoProtocolHandler handler = new EchoProtocolHandler();
         acceptor.setDefaultLocalAddress(addr);
         acceptor.setHandler(handler);
         for (int i = 0; i < 1048576; i++) {
             acceptor.bind();
             acceptor.unbind();
             if (i % 100 == 0) {
                 System.out.println(i + " (" + new Date() + ")");
             }
         }
         bind(false);
     }
 
     private static class EchoProtocolHandler extends IoHandlerAdapter {
         private static final Logger log = LoggerFactory
                 .getLogger(EchoProtocolHandler.class);
 
         @Override
         public void sessionCreated(IoSession session) {
             if (session.getConfig() instanceof SocketSessionConfig) {
                 ((SocketSessionConfig) session.getConfig())
                         .setReceiveBufferSize(2048);
             }
 
             session.getConfig().setIdleTime(IdleStatus.BOTH_IDLE, 10);
         }
 
         @Override
         public void sessionIdle(IoSession session, IdleStatus status) {
             log.info("*** IDLE #" + session.getIdleCount(IdleStatus.BOTH_IDLE)
                     + " ***");
         }
 
         @Override
         public void exceptionCaught(IoSession session, Throwable cause) {
             cause.printStackTrace();
             session.close();
         }
 
         @Override
         public void messageReceived(IoSession session, Object message)
                 throws Exception {
             if (!(message instanceof IoBuffer)) {
                 return;
             }
 
             IoBuffer rb = (IoBuffer) message;
             // Write the received data back to remote peer
             IoBuffer wb = IoBuffer.allocate(rb.remaining());
             wb.put(rb);
             wb.flip();
             session.write(wb);
         }
     }
 }