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e2528875b2
This eliminates the use of Objectify polymorphism for EPP resources entirely (yay!), which makes the Registry 3.0 database migration easier. It is unfortunate that the naming parallelism of EppResources is lost between ContactResource, HostResource, and DomainResource, but the actual type as far as Datastore was concerned was DomainBase all along, and it would be a much more substantial data migration to allow us to continue using the class name DomainResource now that we're no longer using Objectify polymorphism. This simply isn't worth it. This also removes the polymorphic Datastore indexes (which will no longer function as of this change). The non-polymorphic replacement indexes were added in [] ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=230930546
80 lines
3 KiB
Java
80 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.tools.mapreduce.InputReader;
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import com.google.common.collect.ImmutableSet;
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import com.google.common.flogger.FluentLogger;
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import com.googlecode.objectify.Key;
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import google.registry.model.EppResource;
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import google.registry.model.index.EppResourceIndex;
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import google.registry.model.index.EppResourceIndexBucket;
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import java.util.NoSuchElementException;
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/** Reader that maps over {@link EppResourceIndex} and returns resources. */
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class EppResourceEntityReader<R extends EppResource> extends EppResourceBaseReader<R> {
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private static final FluentLogger logger = FluentLogger.forEnclosingClass();
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private static final long serialVersionUID = -8042933349899971801L;
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/**
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* The resource classes to postfilter for.
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*
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* <p>This can be {@link EppResource} or any descendant classes, regardless of whether those
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* classes map directly to a kind in Datastore, with the restriction that none of the classes
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* is a supertype of any of the others.
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*/
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private final ImmutableSet<Class<? extends R>> resourceClasses;
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public EppResourceEntityReader(
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Key<EppResourceIndexBucket> bucketKey,
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ImmutableSet<Class<? extends R>> resourceClasses) {
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super(
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bucketKey,
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ONE_MB * 2, // Estimate 2MB of memory for this reader, since it loads a (max 1MB) entity.
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varargsToKinds(resourceClasses));
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this.resourceClasses = resourceClasses;
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}
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/**
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* Called for each map invocation.
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*
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* @throws NoSuchElementException if there are no more elements, as specified in the
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* {@link InputReader#next} Javadoc.
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*/
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@Override
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public R next() throws NoSuchElementException {
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// Loop until we find a value, or nextQueryResult() throws a NoSuchElementException.
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while (true) {
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Key<? extends EppResource> key = nextQueryResult().getKey();
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EppResource resource = ofy().load().key(key).now();
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if (resource == null) {
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logger.atSevere().log("EppResourceIndex key %s points at a missing resource", key);
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continue;
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}
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// Postfilter to distinguish polymorphic types (e.g. EppResources).
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for (Class<? extends R> resourceClass : resourceClasses) {
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if (resourceClass.isAssignableFrom(resource.getClass())) {
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@SuppressWarnings("unchecked")
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R r = (R) resource;
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return r;
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}
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}
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}
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}
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}
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