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4be4fb0082
This is a 'yellow' Flogger migration CL. Yellow CLs should be mostly safe but include changes that are notable for one reason or another. Manual intervention may be required to address small issues. The comments in this CL indicate cases where suggested code changes should be double checked, or even modified. There may even be cases where files outside this CL are affected by changes to things such as logger visibility. However if a change does not have an associated comment then it should be safe. For more information, see [] Base CL: 197826149 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=198097990
95 lines
3 KiB
Java
95 lines
3 KiB
Java
// Copyright 2017 The Nomulus 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.mapreduce.inputs;
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import static google.registry.model.ofy.ObjectifyService.ofy;
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import com.google.appengine.api.datastore.Cursor;
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import com.google.appengine.api.datastore.QueryResultIterator;
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import com.google.appengine.tools.mapreduce.InputReader;
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import com.googlecode.objectify.Key;
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import com.googlecode.objectify.cmd.Query;
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import google.registry.model.ofy.CommitLogBucket;
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import google.registry.model.ofy.CommitLogManifest;
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import java.util.NoSuchElementException;
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import javax.annotation.Nullable;
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import org.joda.time.DateTime;
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/** {@link InputReader} that maps over {@link CommitLogManifest}. */
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class CommitLogManifestReader
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extends RetryingInputReader<Key<CommitLogManifest>, Key<CommitLogManifest>> {
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/**
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* Memory estimation for this reader.
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*
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* Elements are relatively small (parent key, Id, and a set of deleted keys), so this should be
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* more than enough.
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*/
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private static final long MEMORY_ESTIMATE = 100 * 1024;
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private static final long serialVersionUID = 6215490573108252100L;
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private final Key<CommitLogBucket> bucketKey;
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/**
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* Cutoff date for result.
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*
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* If present, all resulting CommitLogManifest will be dated prior to this date.
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*/
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@Nullable
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private final DateTime olderThan;
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CommitLogManifestReader(Key<CommitLogBucket> bucketKey, @Nullable DateTime olderThan) {
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this.bucketKey = bucketKey;
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this.olderThan = olderThan;
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}
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@Override
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public QueryResultIterator<Key<CommitLogManifest>> getQueryIterator(@Nullable Cursor cursor) {
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return startQueryAt(query(), cursor).keys().iterator();
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}
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@Override
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public int getTotal() {
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return query().count();
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}
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/** Query for children of this bucket. */
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Query<CommitLogManifest> query() {
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Query<CommitLogManifest> query = ofy().load().type(CommitLogManifest.class).ancestor(bucketKey);
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if (olderThan != null) {
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query = query.filterKey(
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"<",
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Key.create(bucketKey, CommitLogManifest.class, olderThan.getMillis()));
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}
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return query;
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}
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/** Returns the estimated memory that will be used by this reader in bytes. */
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@Override
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public long estimateMemoryRequirement() {
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return MEMORY_ESTIMATE;
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}
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/**
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* Get the next {@link CommitLogManifest} from the query.
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*
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* @throws NoSuchElementException if there are no more elements.
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*/
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@Override
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public Key<CommitLogManifest> next() {
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return nextQueryResult();
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}
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}
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