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/ofy/TransactionInfo.java

@@ -0,0 +1,99 @@
+// 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.ofy;
+
+import static com.google.common.base.Functions.constant;
+import static com.google.common.base.Preconditions.checkState;
+import static com.google.common.collect.Maps.filterValues;
+import static com.google.common.collect.Maps.toMap;
+import static com.google.domain.registry.model.ofy.CommitLogBucket.getArbitraryBucketId;
+import static com.googlecode.objectify.ObjectifyService.ofy;
+
+import com.google.common.base.Predicate;
+import com.google.common.base.Predicates;
+import com.google.common.collect.FluentIterable;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+
+import com.googlecode.objectify.Key;
+
+import org.joda.time.DateTime;
+
+import java.util.Map;
+
+/** Metadata for an {@link Ofy} transaction that saves commit logs. */
+class TransactionInfo {
+
+  private static final Predicate<Object> IS_DELETE = Predicates.<Object>equalTo(Delete.SENTINEL);
+
+  private enum Delete { SENTINEL }
+
+  /** Logical "now" of the transaction. */
+  DateTime transactionTime;
+
+  /** Whether this is a read-only transaction. */
+  private boolean readOnly;
+
+  /** Bucket shard to under which commit log will be stored, chosen at random (in production). */
+  final Key<CommitLogBucket> bucketKey = CommitLogBucket.getBucketKey(getArbitraryBucketId());
+
+  /**
+   * Accumulator of save/delete operations performed in transaction.
+   *
+   * <p>The {@link ImmutableMap} builder provides us the benefit of not permitting duplicates.
+   * This allows us to avoid potential race conditions where the same key is mutated twice in a
+   * transaction.
+   */
+  private final ImmutableMap.Builder<Key<?>, Object> changesBuilder = new ImmutableMap.Builder<>();
+
+  TransactionInfo(DateTime now) {
+    this.transactionTime = now;
+    ofy().load().key(bucketKey);  // Asynchronously load value into session cache.
+  }
+
+  TransactionInfo setReadOnly() {
+    this.readOnly = true;
+    return this;
+  }
+
+  void assertNotReadOnly() {
+    checkState(!readOnly, "This is a read only transaction.");
+  }
+
+  void putSaves(Map<Key<?>, ?> keysToEntities) {
+    assertNotReadOnly();
+    changesBuilder.putAll(keysToEntities);
+  }
+
+  void putDeletes(Iterable<Key<?>> keys) {
+    assertNotReadOnly();
+    changesBuilder.putAll(toMap(keys, constant(TransactionInfo.Delete.SENTINEL)));
+  }
+
+  ImmutableSet<Key<?>> getTouchedKeys() {
+    return ImmutableSet.copyOf(changesBuilder.build().keySet());
+  }
+
+  ImmutableSet<Key<?>> getDeletes() {
+    return ImmutableSet.copyOf(filterValues(changesBuilder.build(), IS_DELETE).keySet());
+  }
+
+  ImmutableSet<Object> getSaves() {
+    return FluentIterable
+        .from(changesBuilder.build().values())
+        .filter(Predicates.not(IS_DELETE))
+        .toSet();
+  }
+}