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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5
gerrit-httpd/src/main/java/com/google/gerrit/httpd/plugins/HttpAutoRegisterModuleGenerator.java
View File

@@ -17,7 +17,7 @@ package com.google.gerrit.httpd.plugins;
import static com.google.gerrit.server.plugins.AutoRegisterUtil.calculateBindAnnotation;
import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.Multimap;
import com.google.common.collect.ListMultimap;
import com.google.gerrit.extensions.annotations.Export;
import com.google.gerrit.server.plugins.InvalidPluginException;
import com.google.gerrit.server.plugins.ModuleGenerator;
@@ -35,7 +35,8 @@ import javax.servlet.http.HttpServlet;
class HttpAutoRegisterModuleGenerator extends ServletModule
implements ModuleGenerator {
private final Map<String, Class<HttpServlet>> serve = new HashMap<>();
private final Multimap<TypeLiteral<?>, Class<?>> listeners = LinkedListMultimap.create();
private final ListMultimap<TypeLiteral<?>, Class<?>> listeners =
LinkedListMultimap.create();
@Override
protected void configureServlets() {