| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | |
| 20 | package org.jclouds.ec2.predicates; |
| 21 | |
| 22 | import static com.google.common.collect.Iterables.getLast; |
| 23 | |
| 24 | import javax.annotation.Resource; |
| 25 | |
| 26 | import org.jclouds.ec2.domain.Attachment; |
| 27 | import org.jclouds.ec2.domain.Volume; |
| 28 | import org.jclouds.ec2.services.ElasticBlockStoreClient; |
| 29 | import org.jclouds.logging.Logger; |
| 30 | |
| 31 | import com.google.common.base.Predicate; |
| 32 | import com.google.common.collect.Iterables; |
| 33 | import com.google.inject.Inject; |
| 34 | import com.google.inject.Singleton; |
| 35 | |
| 36 | /** |
| 37 | * Tests to see if a volume is detached. |
| 38 | * |
| 39 | * @author Karthik Arunachalam |
| 40 | */ |
| 41 | @Singleton |
| 42 | public class VolumeDetached implements Predicate<Attachment> { |
| 43 | |
| 44 | private final ElasticBlockStoreClient client; |
| 45 | @Resource |
| 46 | protected Logger logger = Logger.NULL; |
| 47 | |
| 48 | @Inject |
| 49 | public VolumeDetached(ElasticBlockStoreClient client) { |
| 50 | this.client = client; |
| 51 | } |
| 52 | |
| 53 | public boolean apply(Attachment attachment) { |
| 54 | logger.trace("looking for volume %s", attachment.getVolumeId()); |
| 55 | Volume volume = Iterables.getOnlyElement(client.describeVolumesInRegion(attachment |
| 56 | .getRegion(), attachment.getVolumeId())); |
| 57 | |
| 58 | /*If attachment size is 0 volume is detached for sure.*/ |
| 59 | if (volume.getAttachments().size() == 0) { |
| 60 | return true; |
| 61 | } |
| 62 | |
| 63 | /* But if attachment size is > 0, then the attachment could be in any state. |
| 64 | * So we need to check if the status is DETACHED (return true) or not (return false). |
| 65 | */ |
| 66 | Attachment lastAttachment = getLast(volume.getAttachments()); |
| 67 | logger.trace("%s: looking for status %s: currently: %s", lastAttachment, |
| 68 | Attachment.Status.DETACHED, lastAttachment.getStatus()); |
| 69 | return lastAttachment.getStatus() == Attachment.Status.DETACHED; |
| 70 | } |
| 71 | } |
| 72 | |