org.jclouds.ec2.predicates.InstanceStateTerminated.java Source code

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Here is the source code for org.jclouds.ec2.predicates.InstanceStateTerminated.java

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/*
 * 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 java.util.NoSuchElementException;

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 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 InstanceStateTerminated implements Predicate<RunningInstance> {

    private final EC2Api client;

    @Resource
    protected Logger logger = Logger.NULL;

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

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

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