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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.aws.ec2.compute.strategy;
20  
21  import static com.google.common.base.Preconditions.checkNotNull;
22  import static com.google.common.base.Predicates.notNull;
23  import static com.google.common.collect.Iterables.concat;
24  import static com.google.common.collect.Iterables.filter;
25  import static com.google.common.collect.Iterables.transform;
26  import static org.jclouds.concurrent.FutureIterables.transformParallel;
27  
28  import java.util.Set;
29  import java.util.concurrent.ExecutorService;
30  import java.util.concurrent.Future;
31  
32  import javax.inject.Inject;
33  import javax.inject.Named;
34  import javax.inject.Singleton;
35  
36  import org.jclouds.Constants;
37  import org.jclouds.aws.ec2.AWSEC2AsyncClient;
38  import org.jclouds.aws.ec2.domain.AWSRunningInstance;
39  import org.jclouds.aws.ec2.domain.SpotInstanceRequest;
40  import org.jclouds.aws.ec2.functions.SpotInstanceRequestToAWSRunningInstance;
41  import org.jclouds.compute.domain.NodeMetadata;
42  import org.jclouds.ec2.compute.strategy.EC2ListNodesStrategy;
43  import org.jclouds.ec2.domain.RunningInstance;
44  import org.jclouds.location.Region;
45  
46  import com.google.common.base.Function;
47  
48  /**
49   * 
50   * @author Adrian Cole
51   */
52  @Singleton
53  public class AWSEC2ListNodesStrategy extends EC2ListNodesStrategy {
54  
55     protected final AWSEC2AsyncClient client;
56     protected final SpotInstanceRequestToAWSRunningInstance spotConverter;
57  
58     @Inject
59     protected AWSEC2ListNodesStrategy(AWSEC2AsyncClient client, @Region Set<String> regions,
60              Function<RunningInstance, NodeMetadata> runningInstanceToNodeMetadata,
61              @Named(Constants.PROPERTY_USER_THREADS) ExecutorService executor,
62              SpotInstanceRequestToAWSRunningInstance spotConverter) {
63        super(client, regions, runningInstanceToNodeMetadata, executor);
64        this.client = checkNotNull(client, "client");
65        this.spotConverter = checkNotNull(spotConverter, "spotConverter");
66     }
67  
68     @Override
69     protected Iterable<? extends RunningInstance> pollRunningInstances() {
70        Iterable<? extends AWSRunningInstance> spots = filter(transform(concat(transformParallel(regions,
71                 new Function<String, Future<Set<SpotInstanceRequest>>>() {
72  
73                    @SuppressWarnings("unchecked")
74                    @Override
75                    public Future<Set<SpotInstanceRequest>> apply(String from) {
76                       return (Future<Set<SpotInstanceRequest>>) client.getSpotInstanceServices()
77                                .describeSpotInstanceRequestsInRegion(from);
78                    }
79  
80                 }, executor, null, logger, "reservations")), spotConverter), notNull());
81  
82        return concat(super.pollRunningInstances(), spots);
83     }
84  }