/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.http.impl.nio.reactor;
  
  import java.io.IOException;
  import java.net.SocketAddress;
  import java.nio.channels.Channel;
  import java.nio.channels.SelectionKey;
  
  import org.apache.http.annotation.ThreadingBehavior;
  import org.apache.http.annotation.Contract;
  import org.apache.http.nio.reactor.ListenerEndpoint;
  import org.apache.http.util.Args;
  
  /**
   * Default implementation of {@link ListenerEndpoint}.
   *
   * @since 4.0
   */
  @Contract(threading = ThreadingBehavior.SAFE_CONDITIONAL)
  public class ListenerEndpointImpl implements ListenerEndpoint {
  
      private volatile boolean completed;
      private volatile boolean closed;
      private volatile SelectionKey key;
      private volatile SocketAddress address;
      private volatile IOException exception;
  
      private final ListenerEndpointClosedCallback callback;
  
      public ListenerEndpointImpl(
              final SocketAddress address,
              final ListenerEndpointClosedCallback callback) {
          super();
          Args.notNull(address, "Address");
          this.address = address;
          this.callback = callback;
      }
  
      @Override
      public SocketAddress getAddress() {
          return this.address;
      }
  
      public boolean isCompleted() {
          return this.completed;
      }
  
      @Override
      public IOException getException() {
          return this.exception;
      }
  
      @Override
      public void waitFor() throws InterruptedException {
          if (this.completed) {
              return;
          }
          synchronized (this) {
              while (!this.completed) {
                  wait();
              }
          }
      }
  
      public void completed(final SocketAddress address) {
          Args.notNull(address, "Address");
          if (this.completed) {
              return;
          }
          this.completed = true;
          synchronized (this) {
              this.address = address;
              notifyAll();
         }
     }
 
     public void failed(final IOException exception) {
         if (exception == null) {
             return;
         }
         if (this.completed) {
             return;
         }
         this.completed = true;
         synchronized (this) {
             this.exception = exception;
             notifyAll();
         }
     }
 
     public void cancel() {
         if (this.completed) {
             return;
         }
         this.completed = true;
         this.closed = true;
         synchronized (this) {
             notifyAll();
         }
     }
 
     protected void setKey(final SelectionKey key) {
         this.key = key;
     }
 
     @Override
     public boolean isClosed() {
         return this.closed || (this.key != null && !this.key.isValid());
     }
 
     @Override
     public void close() {
         if (this.closed) {
             return;
         }
         this.completed = true;
         this.closed = true;
         if (this.key != null) {
             this.key.cancel();
             final Channel channel = this.key.channel();
             try {
                 channel.close();
             } catch (final IOException ignore) {}
         }
         if (this.callback != null) {
             this.callback.endpointClosed(this);
         }
         synchronized (this) {
             notifyAll();
         }
     }
 
     @Override
     public String toString() {
         return "[address=" + address + ", key=" + key + ", closed=" + closed + ", completed="
                 + completed + ", exception=" + exception + ", callback=" + callback + "]";
     }
 
 }