/**
 * 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.jstorm.task;

import backtype.storm.spout.ISpout;
import backtype.storm.task.IBolt;
import backtype.storm.topology.IDynamicComponent;
import backtype.storm.utils.WorkerClassLoader;
import com.alibaba.jstorm.callback.AsyncLoopThread;
import com.alibaba.jstorm.cluster.StormClusterState;
import com.alibaba.jstorm.daemon.worker.ShutdownableDameon;
import com.alibaba.jstorm.utils.JStormUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;
import java.util.Map;

/**
 * shutdown one task
 * 
 * @author yannian/Longda
 */
public class TaskShutdownDameon implements ShutdownableDameon {
    private static Logger LOG = LoggerFactory.getLogger(TaskShutdownDameon.class);

    public static final byte QUIT_MSG = (byte) 0xff;

    private Task task;
    private TaskStatus taskStatus;
    private String topology_id;
    private Integer task_id;
    private List<AsyncLoopThread> all_threads;
    private StormClusterState zkCluster;
    private Object task_obj;
    private boolean isClosed = false;

    public TaskShutdownDameon(TaskStatus taskStatus, String topology_id, Integer task_id, List<AsyncLoopThread> all_threads, StormClusterState zkCluster,
            Object task_obj, Task task) {
        this.taskStatus = taskStatus;
        this.topology_id = topology_id;
        this.task_id = task_id;
        this.all_threads = all_threads;
        this.zkCluster = zkCluster;
        this.task_obj = task_obj;
        this.task = task;
    }

    @Override
    public void shutdown() {
        synchronized (this) {
            if (isClosed == true) {
                return;
            }
            isClosed = true;
        }

        LOG.info("Begin to shut down task " + topology_id + ":" + task_id);

        // all thread will check the taskStatus
        // once it has been set SHUTDOWN, it will quit
        taskStatus.setStatus(TaskStatus.SHUTDOWN);

        // waiting 100ms for executor thread shutting it's own
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
        }

        for (AsyncLoopThread thr : all_threads) {
            LOG.info("Begin to shutdown " + thr.getThread().getName());
            thr.cleanup();
            JStormUtils.sleepMs(10);
            thr.interrupt();
            // try {
            // //thr.join();
            // thr.getThread().stop(new RuntimeException());
            // } catch (Throwable e) {
            // }
            LOG.info("Successfully shutdown " + thr.getThread().getName());
        }

        closeComponent(task_obj);

        try {
            zkCluster.disconnect();
        } catch (Exception e) {
            LOG.error("Failed to disconnect zk for task-" + task_id);
        }

        LOG.info("Successfully shutdown task " + topology_id + ":" + task_id);

    }

    public void join() throws InterruptedException {
        for (AsyncLoopThread t : all_threads) {
            t.join();
        }
    }

    private void closeComponent(Object _task_obj) {
        if (_task_obj instanceof IBolt) {
            ((IBolt) _task_obj).cleanup();
        }

        if (_task_obj instanceof ISpout) {
            ((ISpout) _task_obj).close();
        }
    }

    @Override
    public boolean waiting() {
        return taskStatus.isRun();
    }

    public void deactive() {

        if (task_obj instanceof ISpout) {
            taskStatus.setStatus(TaskStatus.PAUSE);
            WorkerClassLoader.switchThreadContext();

            try {
                ((ISpout) task_obj).deactivate();
            } finally {
                WorkerClassLoader.restoreThreadContext();
            }
        }

    }

    public void active() {
        if (task_obj instanceof ISpout) {
            taskStatus.setStatus(TaskStatus.RUN);
            WorkerClassLoader.switchThreadContext();
            try {
                ((ISpout) task_obj).activate();
            } finally {
                WorkerClassLoader.restoreThreadContext();
            }
        }
    }

    public void update(Map conf) {
        if (task_obj instanceof IDynamicComponent) {
            ((IDynamicComponent) task_obj).update(conf);
        }
    }

    @Override
    public void run() {
        shutdown();
    }

    public int getTaskId() {
        return this.task_id;
    }

    public Task getTask() {
        return this.task;
    }
}