predicates for image

compute/src/main/java/org/jclouds/compute/predicates/AtomicImageAvailable.java

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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;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import org.jclouds.compute.domain.Image.Status;
+import org.jclouds.compute.predicates.internal.RefreshImageAndDoubleCheckOnFailUnlessStatusInvalid;
+import org.jclouds.compute.strategy.GetImageStrategy;
+
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * 
+ * Tests to see if a image is available.
+ * 
+ * @author Adrian Cole
+ */
+@Singleton
+public class AtomicImageAvailable extends RefreshImageAndDoubleCheckOnFailUnlessStatusInvalid {
+
+   @Inject
+   public AtomicImageAvailable(GetImageStrategy client) {
+      super(Status.AVAILABLE, ImmutableSet.of(Status.ERROR, Status.DELETED), client);
+   }
+}

compute/src/main/java/org/jclouds/compute/predicates/AtomicImageDeleted.java

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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;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import org.jclouds.compute.domain.Image;
+import org.jclouds.compute.domain.Image.Status;
+import org.jclouds.compute.predicates.internal.TrueIfNullOrDeletedRefreshAndDoubleCheckOnFalse;
+import org.jclouds.compute.strategy.GetImageStrategy;
+
+import com.google.inject.Inject;
+
+/**
+ * 
+ * 
+ * @author Adrian Cole
+ */
+public class AtomicImageDeleted extends TrueIfNullOrDeletedRefreshAndDoubleCheckOnFalse<Image.Status, Image> {
+
+   private final GetImageStrategy client;
+
+   @Inject
+   public AtomicImageDeleted(GetImageStrategy client) {
+      super(Status.DELETED);
+      this.client = checkNotNull(client, "client");
+   }
+   
+   @Override
+   protected Image refreshOrNull(Image resource) {
+      if (resource == null || resource.getId() == null)
+         return null;
+      return client.getImage(resource.getId());
+   }
+}

compute/src/main/java/org/jclouds/compute/predicates/internal/RefreshImageAndDoubleCheckOnFailUnlessStatusInvalid.java

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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.ComputeService;
+import org.jclouds.compute.domain.Image;
+import org.jclouds.compute.domain.Image.Status;
+import org.jclouds.compute.strategy.GetImageStrategy;
+
+import com.google.common.collect.ImmutableSet;
+import com.google.inject.Inject;
+
+/**
+ * 
+ * The point of RefreshAndDoubleCheckOnFailUnlessStateInvalid is to keep an atomic reference to a
+ * image, so as to eliminate a redundant {@link ComputeService#getImage} call after the
+ * predicate passes.
+ * 
+ * @author Adrian Cole
+ */
+@Singleton
+public class RefreshImageAndDoubleCheckOnFailUnlessStatusInvalid extends RefreshAndDoubleCheckOnFailUnlessStatusInvalid<Image.Status, Image> {
+
+   private final GetImageStrategy client;
+
+   @Inject
+   public RefreshImageAndDoubleCheckOnFailUnlessStatusInvalid(Status intended, GetImageStrategy client) {
+      this(intended, ImmutableSet.of(Status.ERROR), client);
+   }
+
+   public RefreshImageAndDoubleCheckOnFailUnlessStatusInvalid(Status intended, Set<Status> invalids,
+            GetImageStrategy client) {
+      super(intended, invalids);
+      this.client = checkNotNull(client, "client");
+   }
+
+   @Override
+   protected Image refreshOrNull(Image resource) {
+      if (resource == null || resource.getId() == null)
+         return null;
+      return client.getImage(resource.getId());
+   }
+}