| /** |
| * 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. |
| */ |
| package org.jclouds.ec2.compute.strategy; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.base.Predicates.and; |
| import static com.google.common.base.Predicates.notNull; |
| import static com.google.common.collect.Iterables.concat; |
| import static com.google.common.collect.Iterables.filter; |
| import static com.google.common.collect.Iterables.transform; |
| import static org.jclouds.concurrent.FutureIterables.transformParallel; |
| |
| import java.util.Set; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Future; |
| |
| import javax.annotation.Resource; |
| import javax.inject.Inject; |
| import javax.inject.Named; |
| import javax.inject.Singleton; |
| |
| import org.jclouds.Constants; |
| import org.jclouds.compute.domain.ComputeMetadata; |
| import org.jclouds.compute.domain.NodeMetadata; |
| import org.jclouds.compute.predicates.NodePredicates; |
| import org.jclouds.compute.reference.ComputeServiceConstants; |
| import org.jclouds.compute.strategy.ListNodesStrategy; |
| import org.jclouds.ec2.EC2AsyncClient; |
| import org.jclouds.ec2.domain.Reservation; |
| import org.jclouds.ec2.domain.RunningInstance; |
| import org.jclouds.location.Region; |
| import org.jclouds.logging.Logger; |
| |
| import com.google.common.base.Function; |
| import com.google.common.base.Predicate; |
| import com.google.common.collect.ImmutableSet; |
| |
| /** |
| * |
| * @author Adrian Cole |
| */ |
| @Singleton |
| public class EC2ListNodesStrategy implements ListNodesStrategy { |
| @Resource |
| @Named(ComputeServiceConstants.COMPUTE_LOGGER) |
| protected Logger logger = Logger.NULL; |
| |
| protected final EC2AsyncClient client; |
| protected final Set<String> regions; |
| protected final Function<RunningInstance, NodeMetadata> runningInstanceToNodeMetadata; |
| protected final ExecutorService executor; |
| |
| @Inject |
| protected EC2ListNodesStrategy(EC2AsyncClient client, @Region Set<String> regions, |
| Function<RunningInstance, NodeMetadata> runningInstanceToNodeMetadata, |
| @Named(Constants.PROPERTY_USER_THREADS) ExecutorService executor) { |
| this.client = checkNotNull(client, "client"); |
| this.regions = checkNotNull(regions, "regions"); |
| this.runningInstanceToNodeMetadata = checkNotNull(runningInstanceToNodeMetadata, "runningInstanceToNodeMetadata"); |
| this.executor = checkNotNull(executor, "executor"); |
| } |
| |
| @Override |
| public Set<? extends ComputeMetadata> listNodes() { |
| return listDetailsOnNodesMatching(NodePredicates.all()); |
| } |
| |
| @Override |
| public Set<? extends NodeMetadata> listDetailsOnNodesMatching(Predicate<ComputeMetadata> filter) { |
| Iterable<? extends RunningInstance> instances = pollRunningInstances(); |
| Iterable<? extends NodeMetadata> nodes = filter(transform(filter(instances, notNull()), |
| runningInstanceToNodeMetadata), and(notNull(), filter)); |
| return ImmutableSet.copyOf(nodes); |
| } |
| |
| protected Iterable<? extends RunningInstance> pollRunningInstances() { |
| Iterable<? extends Set<? extends Reservation<? extends RunningInstance>>> reservations = transformParallel( |
| regions, new Function<String, Future<Set<? extends Reservation<? extends RunningInstance>>>>() { |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public Future<Set<? extends Reservation<? extends RunningInstance>>> apply(String from) { |
| return castToSpecificTypedFuture(client.getInstanceServices().describeInstancesInRegion(from)); |
| } |
| |
| }, executor, null, logger, "reservations"); |
| |
| return concat(concat(reservations)); |
| } |
| |
| // "hide" this cast (i.e. do not perform inline) from the Java 7 compiler - see http://stackoverflow.com/questions/8637937/why-does-a-generic-cast-of-a-list-extends-set-to-listset-succeed-on-sun |
| @SuppressWarnings("unchecked") |
| private static <T> Future<T> castToSpecificTypedFuture(Future<? extends T> input) { |
| return (Future<T>) input; |
| } |
| } |