org.jclouds.aws.ec2.predicates.VolumeAttached.java Source code

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

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/**
 *
 * Copyright (C) 2010 Cloud Conscious, LLC. <info@cloudconscious.com>
 *
 * ====================================================================
 * 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.jclouds.aws.ec2.predicates;

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

import org.jclouds.aws.ec2.domain.Attachment;
import org.jclouds.aws.ec2.domain.Volume;
import org.jclouds.aws.ec2.services.ElasticBlockStoreClient;
import org.jclouds.logging.Logger;

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

/**
 * 
 * Tests to see if a volume is attached.
 * 
 * @author Adrian Cole
 */
@Singleton
public class VolumeAttached implements Predicate<Attachment> {

    private final ElasticBlockStoreClient client;
    @Resource
    protected Logger logger = Logger.NULL;

    @Inject
    public VolumeAttached(ElasticBlockStoreClient client) {
        this.client = client;
    }

    public boolean apply(Attachment attachment) {
        logger.trace("looking for volume %s", attachment.getVolumeId());
        Volume volume = Iterables
                .getOnlyElement(client.describeVolumesInRegion(attachment.getRegion(), attachment.getVolumeId()));
        if (volume.getAttachments().size() == 0) {
            return false;
        }
        Attachment lastAttachment = Sets.newTreeSet(volume.getAttachments()).last();
        logger.trace("%s: looking for status %s: currently: %s", lastAttachment, Attachment.Status.ATTACHED,
                lastAttachment.getStatus());
        return lastAttachment.getStatus() == Attachment.Status.ATTACHED;
    }

}