/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at
 * trunk/opendj3/legal-notices/CDDLv1_0.txt
 * or http://forgerock.org/license/CDDLv1.0.html.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at
 * trunk/opendj3/legal-notices/CDDLv1_0.txt.  If applicable,
 * add the following below this CDDL HEADER, with the fields enclosed
 * by brackets "[]" replaced with your own identifying information:
 *      Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 *
 *
 *      Copyright 2010 Sun Microsystems, Inc.
 *      Portions copyright 2011-2012 ForgeRock AS
 */

package com.forgerock.opendj.ldap;



import java.io.Closeable;
import java.io.IOException;
import java.net.SocketAddress;
import java.util.logging.Level;

import org.forgerock.opendj.ldap.DecodeOptions;
import org.forgerock.opendj.ldap.LDAPClientContext;
import org.forgerock.opendj.ldap.LDAPListenerOptions;
import org.forgerock.opendj.ldap.ServerConnectionFactory;
import org.glassfish.grizzly.filterchain.FilterChain;
import org.glassfish.grizzly.filterchain.FilterChainBuilder;
import org.glassfish.grizzly.filterchain.TransportFilter;
import org.glassfish.grizzly.nio.transport.TCPNIOServerConnection;
import org.glassfish.grizzly.nio.transport.TCPNIOTransport;

import com.forgerock.opendj.util.StaticUtils;



/**
 * LDAP listener implementation.
 */
public final class LDAPListenerImpl implements Closeable
{
  private final TCPNIOTransport transport;
  private final FilterChain defaultFilterChain;
  private final ServerConnectionFactory<LDAPClientContext, Integer> connectionFactory;
  private final TCPNIOServerConnection serverConnection;



  /**
   * Creates a new LDAP listener implementation which will listen for LDAP
   * client connections using the provided address and connection options.
   *
   * @param address
   *          The address to listen on.
   * @param factory
   *          The server connection factory which will be used to create server
   *          connections.
   * @param options
   *          The LDAP listener options.
   * @throws IOException
   *           If an error occurred while trying to listen on the provided
   *           address.
   */
  public LDAPListenerImpl(final SocketAddress address,
      final ServerConnectionFactory<LDAPClientContext, Integer> factory,
      final LDAPListenerOptions options) throws IOException
  {
    if (options.getTCPNIOTransport() == null)
    {
      this.transport = DefaultTCPNIOTransport.getInstance();
    }
    else
    {
      this.transport = options.getTCPNIOTransport();
    }
    this.connectionFactory = factory;

    final DecodeOptions decodeOptions = new DecodeOptions(options
        .getDecodeOptions());
    this.defaultFilterChain = FilterChainBuilder
        .stateless()
        .add(new TransportFilter())
        .add(new LDAPServerFilter(this, new LDAPReader(decodeOptions), 0))
        .build();

    this.serverConnection = transport.bind(address, options.getBacklog());
    this.serverConnection.setProcessor(defaultFilterChain);
  }



  /**
   * {@inheritDoc}
   */
  @Override
  public void close()
  {
    try
    {
      serverConnection.close().get();
    }
    catch (final InterruptedException e)
    {
      // Cannot handle here.
      Thread.currentThread().interrupt();
    }
    catch (final Exception e)
    {
      // Ignore the exception.
      if (StaticUtils.DEBUG_LOG.isLoggable(Level.WARNING))
      {
        StaticUtils.DEBUG_LOG.log(Level.WARNING,
            "Exception occurred while closing listener:" + e.getMessage(), e);
      }
    }
  }



  /**
   * Returns the address that this LDAP listener is listening on.
   *
   * @return The address that this LDAP listener is listening on.
   */
  public SocketAddress getSocketAddress()
  {
    return serverConnection.getLocalAddress();
  }



  /**
   * {@inheritDoc}
   */
  public String toString()
  {
    final StringBuilder builder = new StringBuilder();
    builder.append("LDAPListener(");
    builder.append(getSocketAddress().toString());
    builder.append(')');
    return builder.toString();
  }



  ServerConnectionFactory<LDAPClientContext, Integer> getConnectionFactory()
  {
    return connectionFactory;
  }



  FilterChain getDefaultFilterChain()
  {
    return defaultFilterChain;
  }
}