/*
 * 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);
	}

}