opendev/gerrit
Code Issues Proposed changes

Prefer subtypes of Multimap

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Guava team recommends using the subinterfaces of Multimap, for the
same reasons they recommend using Set and List rather than Collection:
it documents expectations about ordering, uniqueness, and behavior of
equals. Do this across the board in Gerrit.

Mostly this is straightforward and I tried to exactly match existing
behavior where possible. However, there were a few wrinkles, where
different callers passed different subtypes to the same method.

The main one is arguments to ParameterParser#parse and
splitQueryString, where some callers used SetMultimaps (perhaps
semi-intentionally, or perhaps misunderstanding the nature of
HashMultimap). For the purposes of parameter parsing, a ListMultimap
makes more sense, because it preserves argument order and repetition.

Another instance is a couple places in ReceiveCommits and downstream
where there were SetMultimap<?, Ref>. Since Refs do not implement
equals, this is effectively the same thing as a ListMultimap, and
changing the interface no longer misleads readers into thinking there
might be some deduplication happening.

Finally, this change includes a breaking API change to the return
type of ExternalIncludedIn#getIncludedIn.

Change-Id: I5f1d15e27a32e534a6aaefe204e7a31815f4c8d7
This commit is contained in:
Dave Borowitz
2017-01-13 16:26:45 -05:00
committed by David Pursehouse
parent e5c5953205
commit 484da493b3
76 changed files with 367 additions and 355 deletions
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8
gerrit-server/src/main/java/com/google/gerrit/server/git/EmailMerge.java
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@@ -14,7 +14,7 @@
package com.google.gerrit.server.git;
import com.google.common.collect.Multimap;
import com.google.common.collect.ListMultimap;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.extensions.api.changes.NotifyHandling;
import com.google.gerrit.extensions.api.changes.RecipientType;
@@ -46,7 +46,7 @@ public class EmailMerge implements Runnable, RequestContext {
public interface Factory {
EmailMerge create(Project.NameKey project, Change.Id changeId,
Account.Id submitter, NotifyHandling notifyHandling,
Multimap<RecipientType, Account.Id> accountsToNotify);
ListMultimap<RecipientType, Account.Id> accountsToNotify);
}
private final ExecutorService sendEmailsExecutor;
@@ -59,7 +59,7 @@ public class EmailMerge implements Runnable, RequestContext {
private final Change.Id changeId;
private final Account.Id submitter;
private final NotifyHandling notifyHandling;
private final Multimap<RecipientType, Account.Id> accountsToNotify;
private final ListMultimap<RecipientType, Account.Id> accountsToNotify;
private ReviewDb db;
@@ -73,7 +73,7 @@ public class EmailMerge implements Runnable, RequestContext {
@Assisted Change.Id changeId,
@Assisted @Nullable Account.Id submitter,
@Assisted NotifyHandling notifyHandling,
@Assisted Multimap<RecipientType, Account.Id> accountsToNotify) {
@Assisted ListMultimap<RecipientType, Account.Id> accountsToNotify) {
this.sendEmailsExecutor = executor;
this.mergedSenderFactory = mergedSenderFactory;
this.schemaFactory = schemaFactory;