PingConnectivityChecker.java

/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * 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 org.kaaproject.kaa.client.connectivity;

import org.kaaproject.kaa.client.channel.connectivity.ConnectivityChecker;
import org.kaaproject.kaa.client.channel.impl.channels.DefaultBootstrapChannel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.URL;
import java.net.UnknownHostException;
import java.text.MessageFormat;

public class PingConnectivityChecker implements ConnectivityChecker {
  public static final Logger LOG = LoggerFactory.getLogger(PingConnectivityChecker.class);
  private static final String DEFAULT_HOST = "www.google.com";
  private static final int DEFAULT_PORT = 80;
  private static final int CONNECTION_TIMEOUT_MS = 3000;

  private final String host;

  public PingConnectivityChecker() {
    this(DEFAULT_HOST);
  }

  public PingConnectivityChecker(String host) {
    this.host = host;
  }

  @Override
  public boolean checkConnectivity() {

    try {
      try (Socket soc = new Socket()) {
        // check if we can reach host (ping) thus we test connectivity
        soc.connect(new InetSocketAddress(host, DEFAULT_PORT), CONNECTION_TIMEOUT_MS);
      }
      return true;
    } catch (IOException ex) {
      LOG.warn(MessageFormat.format("Host {0} is unreachable", host), ex);
      return false;
    }
  }

}