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DeReference the codebase

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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
This commit is contained in:
cgoldfeder 2016-09-01 10:44:23 -07:00 • committed by Ben McIlwain
parent 1a60073b24
commit 5098b03af4
119 changed files with 772 additions and 817 deletions
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6
java/google/registry/tools/UniformRapidSuspensionCommand.java
View file

@ -19,6 +19,7 @@ import static com.google.common.base.Strings.nullToEmpty;
import static com.google.common.collect.Sets.difference;
import static google.registry.model.EppResourceUtils.checkResourcesExist;
import static google.registry.model.EppResourceUtils.loadByUniqueId;
import static google.registry.model.ofy.ObjectifyService.ofy;
import static org.joda.time.DateTimeZone.UTC;
import com.beust.jcommander.Parameter;
@ -28,7 +29,6 @@ import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedSet;
import com.google.template.soy.data.SoyMapData;
import com.googlecode.objectify.Ref;
import google.registry.model.domain.DomainResource;
import google.registry.model.domain.secdns.DelegationSignerData;
import google.registry.model.eppcommon.StatusValue;
@ -147,8 +147,8 @@ final class UniformRapidSuspensionCommand extends MutatingEppToolCommand impleme
private ImmutableSortedSet<String> getExistingNameservers(DomainResource domain) {
ImmutableSortedSet.Builder<String> nameservers = ImmutableSortedSet.naturalOrder();
for (Ref<HostResource> nameserverRef : domain.getNameservers()) {
nameservers.add(nameserverRef.get().getForeignKey());
for (HostResource host : ofy().load().keys(domain.getNameservers()).values()) {
nameservers.add(host.getForeignKey());
}
return nameservers.build();
}