mv com/google/domain/registry google/registry

This change renames directories in preparation for the great package
rename. The repository is now in a broken state because the code
itself hasn't been updated. However this should ensure that git
correctly preserves history for each file.

java/google/registry/flows/ResourceAsyncDeleteFlow.java

@@ -0,0 +1,85 @@
+// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+//
+// Licensed 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 com.google.domain.registry.flows;
+
+import static com.google.domain.registry.model.eppoutput.Result.Code.SuccessWithActionPending;
+import static com.google.domain.registry.model.ofy.ObjectifyService.ofy;
+
+import com.google.domain.registry.flows.EppException.AssociationProhibitsOperationException;
+import com.google.domain.registry.model.EppResource;
+import com.google.domain.registry.model.EppResource.Builder;
+import com.google.domain.registry.model.domain.ReferenceUnion;
+import com.google.domain.registry.model.eppcommon.StatusValue;
+import com.google.domain.registry.model.eppinput.ResourceCommand.SingleResourceCommand;
+import com.google.domain.registry.model.eppoutput.Result.Code;
+import com.google.domain.registry.model.index.ForeignKeyIndex;
+
+import com.googlecode.objectify.Work;
+
+/**
+ * An EPP flow that deletes a resource asynchronously (i.e. via mapreduce).
+ *
+ * @param <R> the resource type being changed
+ * @param <B> a builder for the resource
+ * @param <C> the command type, marshalled directly from the epp xml
+ */
+public abstract class ResourceAsyncDeleteFlow
+    <R extends EppResource, B extends Builder<R, ?>, C extends SingleResourceCommand>
+    extends ResourceDeleteFlow<R, C> {
+
+  @Override
+  public void failfast() throws ResourceToDeleteIsReferencedException {
+    // Enter a transactionless context briefly.
+    boolean isLinked = ofy().doTransactionless(new Work<Boolean>() {
+      @Override
+      public Boolean run() {
+        ForeignKeyIndex<R> fki = ForeignKeyIndex.load(resourceClass, targetId, now);
+        if (fki == null) {
+          // Don't failfast on non-existence. We could, but that would duplicate code paths in a way
+          // that would be hard to reason about, and there's no real gain in doing so.
+          return false;
+        }
+        return isLinkedForFailfast(ReferenceUnion.create(fki.getReference()));
+      }
+    });
+    if (isLinked) {
+      throw new ResourceToDeleteIsReferencedException();
+    }
+  }
+
+  /** Subclasses must override this to check if the supplied reference has incoming links. */
+  protected abstract boolean isLinkedForFailfast(ReferenceUnion<R> ref);
+
+  @Override
+  protected final R createOrMutateResource() {
+    @SuppressWarnings("unchecked")
+    B builder = (B) existingResource.asBuilder().addStatusValue(StatusValue.PENDING_DELETE);
+    return builder.build();
+  }
+
+  /** Subclasses can override this to return a different success result code. */
+  @Override
+  protected Code getDeleteResultCode() {
+    return SuccessWithActionPending;
+  }
+
+  /** Resource to be deleted has active incoming references. */
+  public static class ResourceToDeleteIsReferencedException
+      extends AssociationProhibitsOperationException {
+    public ResourceToDeleteIsReferencedException() {
+      super("Resource to be deleted has active incoming references");
+    }
+  }
+}