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Core components to access jclouds services

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/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds 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.jclouds.predicates;

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

import javax.annotation.Resource;
import javax.inject.Named;
import javax.inject.Singleton;

import org.jclouds.logging.Logger;

import com.google.common.net.HostAndPort;
import com.google.inject.Inject;

/**
 * 
 * Tests to see if a socket is open.
 * 
 * @author Adrian Cole
 */
@Singleton
public class InetSocketAddressConnect implements SocketOpen {

   @Resource
   protected Logger logger = Logger.NULL;

   @Inject(optional = true)
   @Named("org.jclouds.socket_timeout")
   private int timeout = 2000;

   @Override
   public boolean apply(HostAndPort socketA) {
      InetSocketAddress socketAddress = new InetSocketAddress(socketA.getHostText(), socketA
               .getPort());
      Socket socket = null;
      try {
         logger.trace("testing socket %s", socketAddress);
         socket = new Socket();
         socket.setReuseAddress(false);
         socket.setSoLinger(false, 1);
         socket.setSoTimeout(timeout);
         socket.connect(socketAddress, timeout);
      } catch (IOException e) {
         return false;
      } finally {
         if (socket != null) {
            try {
               socket.close();
            } catch (IOException ioe) {
               // no work to do
            }
         }
      }
      return true;
   }

}