/*
 * 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.shardingsphere.elasticjob.lite.internal.listener;

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.state.ConnectionState;
import org.apache.curator.framework.state.ConnectionStateListener;
import org.apache.shardingsphere.elasticjob.lite.internal.instance.InstanceService;
import org.apache.shardingsphere.elasticjob.lite.internal.schedule.JobRegistry;
import org.apache.shardingsphere.elasticjob.lite.internal.schedule.JobScheduleController;
import org.apache.shardingsphere.elasticjob.lite.internal.server.ServerService;
import org.apache.shardingsphere.elasticjob.lite.internal.sharding.ExecutionService;
import org.apache.shardingsphere.elasticjob.lite.internal.sharding.ShardingService;
import org.apache.shardingsphere.elasticjob.reg.base.CoordinatorRegistryCenter;

/**
 * Registry center connection state listener.
 */
public final class RegistryCenterConnectionStateListener implements ConnectionStateListener {
    
    private final String jobName;
    
    private final ServerService serverService;
    
    private final InstanceService instanceService;
    
    private final ShardingService shardingService;
    
    private final ExecutionService executionService;
    
    public RegistryCenterConnectionStateListener(final CoordinatorRegistryCenter regCenter, final String jobName) {
        this.jobName = jobName;
        serverService = new ServerService(regCenter, jobName);
        instanceService = new InstanceService(regCenter, jobName);
        shardingService = new ShardingService(regCenter, jobName);
        executionService = new ExecutionService(regCenter, jobName);
    }
    
    @Override
    public void stateChanged(final CuratorFramework client, final ConnectionState newState) {
        if (JobRegistry.getInstance().isShutdown(jobName)) {
            return;
        }
        JobScheduleController jobScheduleController = JobRegistry.getInstance().getJobScheduleController(jobName);
        if (ConnectionState.SUSPENDED == newState || ConnectionState.LOST == newState) {
            jobScheduleController.pauseJob();
        } else if (ConnectionState.RECONNECTED == newState) {
            serverService.persistOnline(serverService.isEnableServer(JobRegistry.getInstance().getJobInstance(jobName).getServerIp()));
            instanceService.persistOnline();
            executionService.clearRunningInfo(shardingService.getLocalShardingItems());
            jobScheduleController.resumeJob();
        }
    }
}