| 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.compute.predicates; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkNotNull; |
| 22 | |
| 23 | import javax.annotation.Resource; |
| 24 | import javax.inject.Singleton; |
| 25 | |
| 26 | import org.jclouds.compute.ComputeService; |
| 27 | import org.jclouds.compute.domain.NodeMetadata; |
| 28 | import org.jclouds.compute.domain.NodeState; |
| 29 | import org.jclouds.logging.Logger; |
| 30 | |
| 31 | import com.google.common.base.Predicate; |
| 32 | import com.google.inject.Inject; |
| 33 | |
| 34 | /** |
| 35 | * |
| 36 | * Tests to see if a node is active. |
| 37 | * |
| 38 | * @author Adrian Cole |
| 39 | */ |
| 40 | @Singleton |
| 41 | public class NodePresentAndInIntendedState implements Predicate<NodeMetadata> { |
| 42 | |
| 43 | private final ComputeService client; |
| 44 | private final NodeState intended; |
| 45 | @Resource |
| 46 | protected Logger logger = Logger.NULL; |
| 47 | |
| 48 | @Inject |
| 49 | public NodePresentAndInIntendedState(NodeState intended, ComputeService client) { |
| 50 | this.intended = intended; |
| 51 | this.client = client; |
| 52 | } |
| 53 | |
| 54 | public boolean apply(NodeMetadata node) { |
| 55 | logger.trace("looking for state on node %s", checkNotNull(node, "node")); |
| 56 | node = refresh(node); |
| 57 | if (node == null) |
| 58 | return false; |
| 59 | logger.trace("%s: looking for node state %s: currently: %s", node.getId(), intended, node.getState()); |
| 60 | if (node.getState() == NodeState.ERROR) |
| 61 | throw new IllegalStateException("node " + node.getId() + " in location " + node.getLocation() |
| 62 | + " is in error state"); |
| 63 | return node.getState() == intended; |
| 64 | } |
| 65 | |
| 66 | private NodeMetadata refresh(NodeMetadata node) { |
| 67 | return client.getNodeMetadata(node.getId()); |
| 68 | } |
| 69 | } |