org.jclouds.ec2.predicates.InstanceStateRunning Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of ec2 Show documentation
jclouds components to access an implementation of EC2
The newest version!
/*
 * 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.jclouds.ec2.predicates;

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

import org.jclouds.ec2.EC2Api;
import org.jclouds.ec2.domain.InstanceState;
import org.jclouds.ec2.domain.RunningInstance;
import org.jclouds.logging.Logger;
import org.jclouds.rest.ResourceNotFoundException;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.inject.Inject;

/**
 * 
 * Tests to see if a task succeeds.
 * 
 * @author Adrian Cole
 */
@Singleton
public class InstanceStateRunning implements Predicate {

   private final EC2Api client;

   @Resource
   protected Logger logger = Logger.NULL;

   @Inject
   public InstanceStateRunning(EC2Api client) {
      this.client = client;
   }

   public boolean apply(RunningInstance instance) {
      logger.trace("looking for state on instance %s", instance);
      try {
         instance = refresh(instance);
         logger.trace("%s: looking for instance state %s: currently: %s",
               instance.getId(), InstanceState.RUNNING, instance
                     .getInstanceState());
         return instance.getInstanceState() == InstanceState.RUNNING;
      } catch (ResourceNotFoundException e) {
         return false;
      }
   }

   private RunningInstance refresh(RunningInstance instance) {
      return Iterables.getOnlyElement(Iterables.getOnlyElement(client
            .getInstanceApi().get().describeInstancesInRegion(
                  instance.getRegion(), instance.getId())));
   }
}