/*
 * 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 org.apache.dolphinscheduler.server.master.processor;

import org.apache.dolphinscheduler.common.utils.JSONUtils;
import org.apache.dolphinscheduler.dao.entity.TaskDefinition;
import org.apache.dolphinscheduler.dao.repository.TaskDefinitionDao;
import org.apache.dolphinscheduler.remote.command.Command;
import org.apache.dolphinscheduler.remote.command.CommandType;
import org.apache.dolphinscheduler.remote.command.TaskExecuteStartCommand;
import org.apache.dolphinscheduler.remote.processor.NettyRequestProcessor;
import org.apache.dolphinscheduler.server.master.runner.StreamTaskExecuteRunnable;
import org.apache.dolphinscheduler.server.master.runner.StreamTaskExecuteThreadPool;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.google.common.base.Preconditions;
import io.netty.channel.Channel;

/**
 * task execute start processor, from api to master
 */
@Component
public class TaskExecuteStartProcessor implements NettyRequestProcessor {

    private final Logger logger = LoggerFactory.getLogger(TaskExecuteStartProcessor.class);

    @Autowired
    private StreamTaskExecuteThreadPool streamTaskExecuteThreadPool;

    @Autowired
    private TaskDefinitionDao taskDefinitionDao;

    @Override
    public void process(Channel channel, Command command) {
        Preconditions.checkArgument(CommandType.TASK_EXECUTE_START == command.getType(),
                String.format("invalid command type : %s", command.getType()));
        TaskExecuteStartCommand taskExecuteStartCommand =
                JSONUtils.parseObject(command.getBody(), TaskExecuteStartCommand.class);
        logger.info("taskExecuteStartCommand: {}", taskExecuteStartCommand);

        TaskDefinition taskDefinition = taskDefinitionDao.findTaskDefinition(
                taskExecuteStartCommand.getTaskDefinitionCode(), taskExecuteStartCommand.getTaskDefinitionVersion());
        if (taskDefinition == null) {
            logger.error("Task definition can not be found, taskDefinitionCode:{}, taskDefinitionVersion:{}",
                    taskExecuteStartCommand.getTaskDefinitionCode(),
                    taskExecuteStartCommand.getTaskDefinitionVersion());
            return;
        }
        streamTaskExecuteThreadPool.execute(new StreamTaskExecuteRunnable(taskDefinition, taskExecuteStartCommand));

        // response
        Command response = new Command(command.getOpaque());
        response.setType(CommandType.TASK_EXECUTE_START);
        response.setBody(new byte[0]);
        channel.writeAndFlush(response);
    }

}
