/*
 * 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.
 */
package com.alibaba.dubbo.remoting.transport.dispatcher.all;

import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.remoting.Channel;
import com.alibaba.dubbo.remoting.ChannelHandler;
import com.alibaba.dubbo.remoting.ExecutionException;
import com.alibaba.dubbo.remoting.RemotingException;
import com.alibaba.dubbo.remoting.exchange.Request;
import com.alibaba.dubbo.remoting.exchange.Response;
import com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable;
import com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.ChannelState;
import com.alibaba.dubbo.remoting.transport.dispatcher.WrappedChannelHandler;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.RejectedExecutionException;

public class AllChannelHandler extends WrappedChannelHandler {

    public AllChannelHandler(ChannelHandler handler, URL url) {
        super(handler, url);
    }

    @Override
    public void connected(Channel channel) throws RemotingException {
        ExecutorService cexecutor = getExecutorService();
        try {
            cexecutor.execute(new ChannelEventRunnable(channel, handler, ChannelState.CONNECTED));
        } catch (Throwable t) {
            throw new ExecutionException("connect event", channel, getClass() + " error when process connected event .", t);
        }
    }

    @Override
    public void disconnected(Channel channel) throws RemotingException {
        ExecutorService cexecutor = getExecutorService();
        try {
            cexecutor.execute(new ChannelEventRunnable(channel, handler, ChannelState.DISCONNECTED));
        } catch (Throwable t) {
            throw new ExecutionException("disconnect event", channel, getClass() + " error when process disconnected event .", t);
        }
    }

    @Override
    public void received(Channel channel, Object message) throws RemotingException {
        ExecutorService cexecutor = getExecutorService();
        try {
            cexecutor.execute(new ChannelEventRunnable(channel, handler, ChannelState.RECEIVED, message));
        } catch (Throwable t) {
            //TODO A temporary solution to the problem that the exception information can not be sent to the opposite end after the thread pool is full. Need a refactoring
            //fix The thread pool is full, refuses to call, does not return, and causes the consumer to wait for time out
        	if(message instanceof Request && t instanceof RejectedExecutionException){
        		Request request = (Request)message;
        		if(request.isTwoWay()){
        			String msg = "Server side(" + url.getIp() + "," + url.getPort() + ") threadpool is exhausted ,detail msg:" + t.getMessage();
        			Response response = new Response(request.getId(), request.getVersion());
        			response.setStatus(Response.SERVER_THREADPOOL_EXHAUSTED_ERROR);
        			response.setErrorMessage(msg);
        			channel.send(response);
        			return;
        		}
        	}
            throw new ExecutionException(message, channel, getClass() + " error when process received event .", t);
        }
    }

    @Override
    public void caught(Channel channel, Throwable exception) throws RemotingException {
        ExecutorService cexecutor = getExecutorService();
        try {
            cexecutor.execute(new ChannelEventRunnable(channel, handler, ChannelState.CAUGHT, exception));
        } catch (Throwable t) {
            throw new ExecutionException("caught event", channel, getClass() + " error when process caught event .", t);
        }
    }
}
