tajo-common/src/main/java/org/apache/tajo/service/HAServiceTracker.java

/**
 * 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.tajo.service;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.net.NetUtils;

import javax.net.SocketFactory;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;

public abstract class HAServiceTracker implements ServiceTracker {
  private static final Log LOG = LogFactory.getLog(HAServiceTracker.class);

  static SocketFactory socketFactory = SocketFactory.getDefault();

  public boolean isHighAvailable() {
    return true;
  }

  public static boolean checkConnection(String address) {
    return checkConnection(address, ":");
  }

  public static boolean checkConnection(String address, String delimiter) {
    String[] hostAddress = address.split(delimiter);
    InetSocketAddress socketAddress = new InetSocketAddress(hostAddress[0], Integer.parseInt(hostAddress[1]));
    return checkConnection(socketAddress);
  }

  public static boolean checkConnection(InetSocketAddress address) {
    boolean isAlive = true;
    Socket socket = null;

    try {
      int connectionTimeout = 10;

      socket = socketFactory.createSocket();
      NetUtils.connect(socket, address, connectionTimeout);
    } catch (Exception e) {
      isAlive = false;
    } finally {
      if (socket != null) {
        try {
          socket.close();
        } catch (IOException e) {
          LOG.debug(e.getMessage(), e);
        }
      }
    }
    return isAlive;
  }
}