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Added new VolumeDetached predicate for EBS support

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karthikarun 2012-01-18 14:01:30 -06:00 committed by andreisavu
parent ecfe1287e9
commit fd01759c8a
1 changed files with 72 additions and 0 deletions
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apis/ec2/src/main/java/org/jclouds/ec2/predicates/VolumeDetached.java Normal file
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package com.gravitant.cloud.adapters.provision.providers;
/**
* 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.
*/
import javax.annotation.Resource;
import javax.inject.Singleton;
import org.jclouds.ec2.domain.Attachment;
import org.jclouds.ec2.domain.Volume;
import org.jclouds.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 detached.
*
* @author Karthik Arunachalam
*/
@Singleton
public class VolumeDetached implements Predicate<Attachment> {
private final ElasticBlockStoreClient client;
@Resource
protected Logger logger = Logger.NULL;
@Inject
public VolumeDetached(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 attachment size is 0 volume is detached for sure.*/
if (volume.getAttachments().size() == 0) {
return true;
}
/* But if attachment size is > 0, then the attachment could be in any state.
* So we need to check if the status is DETACHED (return true) or not (return false).
*/
Attachment lastAttachment = Sets.newTreeSet(volume.getAttachments()).last();
logger.trace("%s: looking for status %s: currently: %s", lastAttachment,
Attachment.Status.DETACHED, lastAttachment.getStatus());
return lastAttachment.getStatus() == Attachment.Status.DETACHED;
}
}