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jclouds components to access compute providers

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/**
 * 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.compute.predicates.internal;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.Set;

import javax.inject.Singleton;

import org.jclouds.compute.domain.NodeMetadata;
import org.jclouds.compute.domain.NodeMetadata.Status;
import org.jclouds.compute.strategy.GetNodeMetadataStrategy;

import com.google.common.collect.ImmutableSet;
import com.google.inject.Inject;

/**
 * 
 * The point of RefreshAndDoubleCheckOnFailUnlessStateInvalid is to keep an atomic reference to a
 * node, so as to eliminate a redundant {@link ComputeService#getNodeMetadata} call after the
 * predicate passes.
 * 
 * @author Adrian Cole
 */
@Singleton
public class RefreshNodeAndDoubleCheckOnFailUnlessStatusInvalid extends RefreshAndDoubleCheckOnFailUnlessStatusInvalid {

   private final GetNodeMetadataStrategy client;

   @Inject
   public RefreshNodeAndDoubleCheckOnFailUnlessStatusInvalid(Status intended, GetNodeMetadataStrategy client) {
      this(intended, ImmutableSet.of(Status.ERROR), client);
   }

   public RefreshNodeAndDoubleCheckOnFailUnlessStatusInvalid(Status intended, Set invalids,
            GetNodeMetadataStrategy client) {
      super(intended, invalids);
      this.client = checkNotNull(client, "client");
   }

   @Override
   protected NodeMetadata refreshOrNull(NodeMetadata resource) {
      if (resource == null || resource.getId() == null)
         return null;
      return client.getNode(resource.getId());
   }
}