| 1 | /** |
| 2 | * |
| 3 | * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com> |
| 4 | * |
| 5 | * ==================================================================== |
| 6 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | * you may not use this file except in compliance with the License. |
| 8 | * 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, software |
| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | * See the License for the specific language governing permissions and |
| 16 | * limitations under the License. |
| 17 | * ==================================================================== |
| 18 | */ |
| 19 | package org.jclouds.ec2.compute.predicates; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkNotNull; |
| 22 | |
| 23 | import java.util.NoSuchElementException; |
| 24 | |
| 25 | import javax.annotation.Resource; |
| 26 | import javax.inject.Singleton; |
| 27 | |
| 28 | import org.jclouds.ec2.EC2Client; |
| 29 | import org.jclouds.ec2.compute.domain.RegionAndName; |
| 30 | import org.jclouds.logging.Logger; |
| 31 | import org.jclouds.rest.ResourceNotFoundException; |
| 32 | |
| 33 | import com.google.common.base.Predicate; |
| 34 | import com.google.common.collect.Iterables; |
| 35 | import com.google.inject.Inject; |
| 36 | |
| 37 | /** |
| 38 | * |
| 39 | * @author Adrian Cole |
| 40 | */ |
| 41 | @Singleton |
| 42 | public class InstancePresent implements Predicate<RegionAndName> { |
| 43 | |
| 44 | private final EC2Client client; |
| 45 | |
| 46 | @Resource |
| 47 | protected Logger logger = Logger.NULL; |
| 48 | |
| 49 | @Inject |
| 50 | public InstancePresent(EC2Client client) { |
| 51 | this.client = checkNotNull(client, "client"); |
| 52 | } |
| 53 | |
| 54 | public boolean apply(RegionAndName instance) { |
| 55 | logger.trace("looking for instance %s/%s", instance.getRegion(), instance.getName()); |
| 56 | try { |
| 57 | refresh(instance); |
| 58 | return true; |
| 59 | } catch (ResourceNotFoundException e) { |
| 60 | return false; |
| 61 | } catch (NoSuchElementException e) { |
| 62 | return false; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | protected void refresh(RegionAndName instance) { |
| 67 | Iterables.getOnlyElement(Iterables.getOnlyElement(client.getInstanceServices().describeInstancesInRegion( |
| 68 | instance.getRegion(), instance.getName()))); |
| 69 | } |
| 70 | } |