mirror of
https://github.com/google/nomulus.git
synced 2025-05-02 04:57:51 +02:00
c458c05801
The dark lord Gosling designed the Java package naming system so that ownership flows from the DNS system. Since we own the domain name registry.google, it seems only appropriate that we should use google.registry as our package name.
99 lines
3.3 KiB
Java
99 lines
3.3 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.model.ofy;
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import static com.google.common.base.Functions.constant;
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import static com.google.common.base.Preconditions.checkState;
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import static com.google.common.collect.Maps.filterValues;
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import static com.google.common.collect.Maps.toMap;
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import static com.googlecode.objectify.ObjectifyService.ofy;
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import static google.registry.model.ofy.CommitLogBucket.getArbitraryBucketId;
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import com.google.common.base.Predicate;
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import com.google.common.base.Predicates;
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import com.google.common.collect.FluentIterable;
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import com.google.common.collect.ImmutableMap;
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import com.google.common.collect.ImmutableSet;
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import com.googlecode.objectify.Key;
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import org.joda.time.DateTime;
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import java.util.Map;
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/** Metadata for an {@link Ofy} transaction that saves commit logs. */
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class TransactionInfo {
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private static final Predicate<Object> IS_DELETE = Predicates.<Object>equalTo(Delete.SENTINEL);
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private enum Delete { SENTINEL }
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/** Logical "now" of the transaction. */
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DateTime transactionTime;
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/** Whether this is a read-only transaction. */
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private boolean readOnly;
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/** Bucket shard to under which commit log will be stored, chosen at random (in production). */
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final Key<CommitLogBucket> bucketKey = CommitLogBucket.getBucketKey(getArbitraryBucketId());
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/**
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* Accumulator of save/delete operations performed in transaction.
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*
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* <p>The {@link ImmutableMap} builder provides us the benefit of not permitting duplicates.
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* This allows us to avoid potential race conditions where the same key is mutated twice in a
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* transaction.
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*/
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private final ImmutableMap.Builder<Key<?>, Object> changesBuilder = new ImmutableMap.Builder<>();
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TransactionInfo(DateTime now) {
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this.transactionTime = now;
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ofy().load().key(bucketKey); // Asynchronously load value into session cache.
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}
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TransactionInfo setReadOnly() {
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this.readOnly = true;
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return this;
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}
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void assertNotReadOnly() {
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checkState(!readOnly, "This is a read only transaction.");
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}
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void putSaves(Map<Key<?>, ?> keysToEntities) {
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assertNotReadOnly();
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changesBuilder.putAll(keysToEntities);
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}
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void putDeletes(Iterable<Key<?>> keys) {
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assertNotReadOnly();
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changesBuilder.putAll(toMap(keys, constant(TransactionInfo.Delete.SENTINEL)));
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}
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ImmutableSet<Key<?>> getTouchedKeys() {
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return ImmutableSet.copyOf(changesBuilder.build().keySet());
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}
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ImmutableSet<Key<?>> getDeletes() {
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return ImmutableSet.copyOf(filterValues(changesBuilder.build(), IS_DELETE).keySet());
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}
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ImmutableSet<Object> getSaves() {
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return FluentIterable
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.from(changesBuilder.build().values())
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.filter(Predicates.not(IS_DELETE))
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.toSet();
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}
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}
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