/*
    * Copyright 2002-2014 the original author or authors.
    *
    * Licensed 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.springframework.web.socket.handler;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import org.springframework.web.socket.CloseStatus;
  import org.springframework.web.socket.WebSocketHandler;
  import org.springframework.web.socket.WebSocketMessage;
  import org.springframework.web.socket.WebSocketSession;
  
  /**
   * A {@link WebSocketHandlerDecorator} that adds logging to WebSocket lifecycle events.
   *
   * @author Rossen Stoyanchev
   * @since 4.0
   */
  public class LoggingWebSocketHandlerDecorator extends WebSocketHandlerDecorator {
  
  	private static final Log logger = LogFactory.getLog(LoggingWebSocketHandlerDecorator.class);
  
  
  	public LoggingWebSocketHandlerDecorator(WebSocketHandler delegate) {
  		super(delegate);
  	}
  
  
  	@Override
  	public void afterConnectionEstablished(WebSocketSession session) throws Exception {
  		if (logger.isDebugEnabled()) {
  			logger.debug("New "	+ session);
  		}
  		super.afterConnectionEstablished(session);
  	}
  
  	@Override
  	public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception {
  		if (logger.isTraceEnabled()) {
  			logger.trace("Handling " + message + " in " + session);
  		}
  		super.handleMessage(session, message);
  	}
  
  	@Override
  	public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception {
  		if (logger.isDebugEnabled()) {
  			logger.debug("Transport error in " + session, exception);
  		}
  		super.handleTransportError(session, exception);
  	}
  
  	@Override
  	public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception {
  		if (logger.isDebugEnabled()) {
  			logger.debug(session + " closed with " + closeStatus);
  		}
  		super.afterConnectionClosed(session, closeStatus);
  	}
  
  }