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5098b03af4
This change replaces all Ref objects in the code with Key objects. These are
stored in datastore as the same object (raw datastore keys), so this is not
a model change.
Our best practices doc says to use Keys not Refs because:
* The .get() method obscures what's actually going on
- Much harder to visually audit the code for datastore loads
- Hard to distinguish Ref<T> get()'s from Optional get()'s and Supplier get()'s
* Implicit ofy().load() offers much less control
- Antipattern for ultimate goal of making Ofy injectable
- Can't control cache use or batch loading without making ofy() explicit anyway
* Serialization behavior is surprising and could be quite dangerous/incorrect
- Can lead to serialization errors. If it actually worked "as intended",
it would lead to a Ref<> on a serialized object being replaced upon
deserialization with a stale copy of the old value, which could potentially
break all kinds of transactional expectations
* Having both Ref<T> and Key<T> introduces extra boilerplate everywhere
- E.g. helper methods all need to have Ref and Key overloads, or you need to
call .key() to get the Key<T> for every Ref<T> you want to pass in
- Creating a Ref<T> is more cumbersome, since it doesn't have all the create()
overloads that Key<T> has, only create(Key<T>) and create(Entity) - no way to
create directly from kind+ID/name, raw Key, websafe key string, etc.
(Note that Refs are treated specially by Objectify's @Load method and Keys are not;
we don't use that feature, but it is the one advantage Refs have over Keys.)
The direct impetus for this change is that I am trying to audit our use of memcache,
and the implicit .get() calls to datastore were making that very hard.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=131965491
81 lines
2.9 KiB
Java
81 lines
2.9 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.flows.async;
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import static google.registry.model.ofy.ObjectifyService.ofy;
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import com.googlecode.objectify.Key;
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import google.registry.dns.DnsQueue;
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import google.registry.model.domain.DomainBase;
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import google.registry.model.host.HostResource;
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import google.registry.model.reporting.HistoryEntry;
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import google.registry.model.reporting.HistoryEntry.Type;
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import google.registry.request.Action;
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import javax.inject.Inject;
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import org.joda.time.DateTime;
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/**
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* A mapreduce to delete the specified HostResource, but ONLY if it is not referred to by any
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* existing DomainBase entity.
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*/
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@Action(path = "/_dr/task/deleteHostResource")
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public class DeleteHostResourceAction extends DeleteEppResourceAction<HostResource> {
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@Inject
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public DeleteHostResourceAction() {
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super(
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new DeleteHostResourceMapper(),
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new DeleteHostResourceReducer());
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}
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/** An async deletion mapper for {@link HostResource}. */
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public static class DeleteHostResourceMapper extends DeleteEppResourceMapper<HostResource> {
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private static final long serialVersionUID = 1941092742903217194L;
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@Override
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protected boolean isLinked(DomainBase domain, Key<HostResource> targetResourceKey) {
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return domain.getNameservers().contains(targetResourceKey);
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}
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}
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/** An async deletion reducer for {@link HostResource}. */
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public static class DeleteHostResourceReducer extends DeleteEppResourceReducer<HostResource> {
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private static final long serialVersionUID = 555457935288867324L;
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@Override
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protected Type getHistoryType(boolean successfulDelete) {
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return successfulDelete
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? HistoryEntry.Type.HOST_DELETE
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: HistoryEntry.Type.HOST_DELETE_FAILURE;
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}
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@Override
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protected void performDeleteTasks(
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HostResource targetResource,
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HostResource deletedResource,
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DateTime deletionTime,
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HistoryEntry historyEntryForDelete) {
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if (targetResource.getSuperordinateDomain() != null) {
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DnsQueue.create().addHostRefreshTask(targetResource.getFullyQualifiedHostName());
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ofy().save().entity(
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ofy().load().key(targetResource.getSuperordinateDomain()).now().asBuilder()
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.removeSubordinateHost(targetResource.getFullyQualifiedHostName())
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.build());
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}
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}
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}
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}
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