compute/src/main/java/org/jclouds/compute/predicates/ScriptStatusReturnsZero.java

/**
 * 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.compute.predicates;

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

import org.jclouds.compute.domain.ExecResponse;
import org.jclouds.logging.Logger;
import org.jclouds.ssh.SshClient;

import com.google.common.base.Predicate;

/**
 * 
 * Tests to if the runscript is still running
 * 
 * @author Adrian Cole
 */
@Singleton
public class ScriptStatusReturnsZero implements Predicate<ScriptStatusReturnsZero.CommandUsingClient> {

   @Resource
   protected Logger logger = Logger.NULL;

   @Override
   public boolean apply(CommandUsingClient commandUsingClient) {
      logger.trace("looking for [%s] state on %s@%s", commandUsingClient.command, commandUsingClient.client
               .getUsername(), commandUsingClient.client.getHostAddress());
      ExecResponse response = refresh(commandUsingClient);
      while (response.getExitStatus() == -1)
         response = refresh(commandUsingClient);
      logger.trace("%s@%s: looking for exit code 0: currently: %s", commandUsingClient.client.getUsername(),
               commandUsingClient.client.getHostAddress(), response.getExitStatus());
      return 0 == response.getExitStatus();
   }

   private ExecResponse refresh(CommandUsingClient commandUsingClient) {
      return commandUsingClient.client.exec(commandUsingClient.command);
   }

   public static class CommandUsingClient {

      public CommandUsingClient(String command, SshClient client) {
         this.command = command;
         this.client = client;
      }

      private final String command;
      private final SshClient client;
   }
}