/*
* 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 static com.google.common.collect.Iterables.getLast;
import javax.annotation.Resource;
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.inject.Inject;
import com.google.inject.Singleton;
/**
* 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 = getLast(volume.getAttachments());
logger.trace("%s: looking for status %s: currently: %s", lastAttachment,
Attachment.Status.DETACHED, lastAttachment.getStatus());
return lastAttachment.getStatus() == Attachment.Status.DETACHED;
}
}