opendev/gerrit
Code Issues Proposed changes

MergeSuperSet: Avoid repeated ref lookups

Browse Source 
This is similar to using a RefCache. We would use that if it
already existed in MergeOpRepoManager, but it doesn't. The actual
usage within MergeSuperSet is a little more specific, so just do a
little cache implementation there.

Change-Id: I0404bc3c1240eab59f1dedf53f068632bd67d5ef
This commit is contained in:
Dave Borowitz
2016-09-15 11:46:15 -04:00
parent 8fa0acb14f
commit c53ad61241
1 changed files with 24 additions and 15 deletions
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37
gerrit-server/src/main/java/com/google/gerrit/server/git/MergeSuperSet.java
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@@ -102,6 +102,7 @@ public class MergeSuperSet {
private final Provider<MergeOpRepoManager> repoManagerProvider;
private final Config cfg;
private final Map<QueryKey, List<ChangeData>> queryCache;
private final Map<Branch.NameKey, Optional<RevCommit>> heads;
private MergeOpRepoManager orm;
private boolean closeOrm;
@@ -116,6 +117,7 @@ public class MergeSuperSet {
this.queryProvider = queryProvider;
this.repoManagerProvider = repoManagerProvider;
queryCache = new HashMap<>();
heads = new HashMap<>();
}
public MergeSuperSet setMergeOpRepoManager(MergeOpRepoManager orm) {
@@ -182,13 +184,11 @@ public class MergeSuperSet {
}
private Set<String> walkChangesByHashes(Collection<RevCommit> sourceCommits,
Set<String> ignoreHashes, OpenRepo or, Optional<RevCommit> head)
Set<String> ignoreHashes, OpenRepo or, Branch.NameKey b)
throws IOException {
Set<String> destHashes = new HashSet<>();
or.rw.reset();
if (head.isPresent()) {
or.rw.markUninteresting(head.get());
}
markHeadUninteresting(or, b);
for (RevCommit c : sourceCommits) {
String name = c.name();
if (ignoreHashes.contains(name)) {
@@ -270,15 +270,9 @@ public class MergeSuperSet {
toWalk.add(commit);
}
Ref ref = or.repo.getRefDatabase().getRef(b.get());
Optional<RevCommit> head =
ref != null
? Optional.<RevCommit>of(or.rw.parseCommit(ref.getObjectId()))
: Optional.<RevCommit>absent();
Set<String> emptySet = Collections.emptySet();
Set<String> visibleHashes = walkChangesByHashes(visibleCommits,
emptySet, or, head);
Set<String> visibleHashes =
walkChangesByHashes(visibleCommits, emptySet, or, b);
List<ChangeData> cds =
byCommitsOnBranchNotMerged(or, db, user, b, visibleHashes);
@@ -287,8 +281,8 @@ public class MergeSuperSet {
visibleChanges.add(chd);
}
Set<String> nonVisibleHashes = walkChangesByHashes(nonVisibleCommits,
visibleHashes, or, head);
Set<String> nonVisibleHashes =
walkChangesByHashes(nonVisibleCommits, visibleHashes, or, b);
Iterables.addAll(nonVisibleChanges,
byCommitsOnBranchNotMerged(or, db, user, b, nonVisibleHashes));
}
@@ -310,6 +304,21 @@ public class MergeSuperSet {
}
}
private void markHeadUninteresting(OpenRepo or, Branch.NameKey b)
throws IOException {
Optional<RevCommit> head = heads.get(b);
if (head == null) {
Ref ref = or.repo.getRefDatabase().exactRef(b.get());
head = ref != null
? Optional.<RevCommit>of(or.rw.parseCommit(ref.getObjectId()))
: Optional.<RevCommit>absent();
heads.put(b, head);
}
if (head.isPresent()) {
or.rw.markUninteresting(head.get());
}
}
private List<ChangeData> byCommitsOnBranchNotMerged(OpenRepo or, ReviewDb db,
CurrentUser user, Branch.NameKey branch, Set<String> hashes)
throws OrmException, IOException {