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/model/index/EppResourceIndexBucket.java

@@ -0,0 +1,66 @@
+// 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.model.index;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.hash.Hashing;
+import com.google.domain.registry.config.RegistryEnvironment;
+import com.google.domain.registry.model.EppResource;
+import com.google.domain.registry.model.ImmutableObject;
+import com.google.domain.registry.model.annotations.VirtualEntity;
+
+import com.googlecode.objectify.Key;
+import com.googlecode.objectify.annotation.Entity;
+import com.googlecode.objectify.annotation.Id;
+
+/** A virtual entity to represent buckets to which EppResourceIndex objects are randomly added. */
+@Entity
+@VirtualEntity
+public class EppResourceIndexBucket extends ImmutableObject {
+
+  @Id
+  private long bucketId;
+
+  /**
+   * Deterministic function that returns a bucket id based on the resource's roid.
+   * NB: At the moment, nothing depends on this being deterministic, so we have the ability to
+   * change the number of buckets and utilize a random distribution once we do.
+   */
+  private static long getBucketIdFromEppResource(Key<? extends EppResource> resourceKey) {
+    int numBuckets = RegistryEnvironment.get().config().getEppResourceIndexBucketCount();
+    // IDs can't be 0, so add 1 to the hash.
+    return Hashing.consistentHash(resourceKey.getName().hashCode(), numBuckets) + 1;
+  }
+
+  /** Gets a bucket key as a function of an EppResource to be indexed. */
+  public static Key<EppResourceIndexBucket> getBucketKey(Key<? extends EppResource> resourceKey) {
+    return Key.create(EppResourceIndexBucket.class, getBucketIdFromEppResource(resourceKey));
+  }
+
+  /** Gets the specified numbered bucket key. */
+  public static Key<EppResourceIndexBucket> getBucketKey(int bucketId) {
+    return Key.create(EppResourceIndexBucket.class, bucketId);
+  }
+
+  /** Returns the keys to all buckets. */
+  public static Iterable<Key<EppResourceIndexBucket>> getAllBuckets() {
+    ImmutableList.Builder<Key<EppResourceIndexBucket>> builder = new ImmutableList.Builder<>();
+    int numBuckets = RegistryEnvironment.get().config().getEppResourceIndexBucketCount();
+    for (int bucketId = 1; bucketId <= numBuckets; bucketId++) {
+      builder.add(getBucketKey(bucketId));
+    }
+    return builder.build();
+  }
+}