/*
 * Copyright 2015 Naver Corp.
 * 
 * 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 com.navercorp.nbasearc.confmaster;


import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
      
import org.springframework.context.ApplicationContext;

import com.navercorp.nbasearc.confmaster.ConfMasterException.MgmtZooKeeperException;
import com.navercorp.nbasearc.confmaster.logger.Logger;
import com.navercorp.nbasearc.confmaster.server.leaderelection.LeaderElectionSupport;

public class GracefulTerminator extends Thread {

    private ConfMaster cm;
    private volatile boolean terminated = false;
    private final CountDownLatch latch = new CountDownLatch(1);
    
    public GracefulTerminator(ApplicationContext context) {
        this.cm = context.getBean(ConfMaster.class);
    }
        
    public boolean isTerminated() {
        return terminated;
    }

    public void terminate() throws InterruptedException, ExecutionException, IOException, MgmtZooKeeperException {
        cm.release();
        latch.countDown();
    }

    @Override
    public void run() {
        try {
            terminate();
        } catch (Exception e) {
            Logger.error("Termination error", e);
        }
    }
    
    public void await() {
        try {
            latch.await();
        } catch (InterruptedException e) {
            Logger.error("Wait for termination fail.", e);
        }
        
        terminated = true;
    }

}
