Optimize RefAdvertiser performance by avoiding sorting
Don't copy and sort the set of references if they are passed through in a RefMap or a SortedMap using the key's natural sort ordering. Either map is already in the order we want to present the items to the client in, so copying and sorting is a waste of local CPU and memory. Change-Id: I49ada7c1220e0fc2a163b9752c2b77525d9c82c1 Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
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@ -99,7 +99,7 @@ protected void end() {
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Map<String, Ref> refs = db.getAllRefs();
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refs.remove(Constants.HEAD);
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adv.send(refs.values());
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adv.send(refs);
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return out.toString().getBytes(Constants.CHARACTER_ENCODING);
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}
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}
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@ -591,7 +591,7 @@ public void sendAdvertisedRefs(final RefAdvertiser adv) throws IOException {
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adv.advertiseCapability(CAPABILITY_OFS_DELTA);
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refs = db.getAllRefs();
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final Ref head = refs.remove(Constants.HEAD);
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adv.send(refs.values());
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adv.send(refs);
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if (!head.isSymbolic())
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adv.advertiseHave(head.getObjectId());
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adv.includeAdditionalHaves();
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@ -44,9 +44,10 @@
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package org.eclipse.jgit.transport;
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import java.io.IOException;
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import java.util.Collection;
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import java.util.LinkedHashSet;
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import java.util.Map;
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import java.util.Set;
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import java.util.SortedMap;
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import org.eclipse.jgit.lib.AlternateRepositoryDatabase;
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import org.eclipse.jgit.lib.AnyObjectId;
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@ -59,6 +60,7 @@
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import org.eclipse.jgit.revwalk.RevObject;
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import org.eclipse.jgit.revwalk.RevTag;
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import org.eclipse.jgit.revwalk.RevWalk;
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import org.eclipse.jgit.util.RefMap;
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/** Support for the start of {@link UploadPack} and {@link ReceivePack}. */
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public abstract class RefAdvertiser {
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@ -122,7 +124,7 @@ public void init(final RevWalk protoWalk, final RevFlag advertisedFlag) {
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* <p>
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* This method must be invoked prior to any of the following:
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* <ul>
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* <li>{@link #send(Collection)}
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* <li>{@link #send(Map)}
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* <li>{@link #advertiseHave(AnyObjectId)}
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* <li>{@link #includeAdditionalHaves()}
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* </ul>
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@ -140,7 +142,7 @@ public void setDerefTags(final boolean deref) {
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* <p>
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* This method must be invoked prior to any of the following:
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* <ul>
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* <li>{@link #send(Collection)}
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* <li>{@link #send(Map)}
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* <li>{@link #advertiseHave(AnyObjectId)}
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* <li>{@link #includeAdditionalHaves()}
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* </ul>
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@ -160,14 +162,14 @@ public void advertiseCapability(String name) {
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*
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* @param refs
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* zero or more refs to format for the client. The collection is
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* copied and sorted before display and therefore may appear in
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* any order.
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* sorted before display if necessary, and therefore may appear
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* in any order.
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* @throws IOException
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* the underlying output stream failed to write out an
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* advertisement record.
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*/
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public void send(final Collection<Ref> refs) throws IOException {
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for (final Ref r : RefComparator.sort(refs)) {
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public void send(final Map<String, Ref> refs) throws IOException {
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for (final Ref r : getSortedRefs(refs)) {
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final RevObject obj = parseAnyOrNull(r.getObjectId());
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if (obj != null) {
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advertiseAny(obj, r.getName());
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@ -177,6 +179,13 @@ public void send(final Collection<Ref> refs) throws IOException {
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}
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}
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private Iterable<Ref> getSortedRefs(Map<String, Ref> all) {
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if (all instanceof RefMap
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|| (all instanceof SortedMap && ((SortedMap) all).comparator() == null))
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return all.values();
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return RefComparator.sort(all.values());
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}
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/**
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* Advertise one object is available using the magic {@code .have}.
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* <p>
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@ -1,5 +1,5 @@
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/*
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* Copyright (C) 2008-2009, Google Inc.
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* Copyright (C) 2008-2010, Google Inc.
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* and other copyright owners as documented in the project's IP log.
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*
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* This program and the accompanying materials are made available
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@ -330,7 +330,7 @@ public void sendAdvertisedRefs(final RefAdvertiser adv) throws IOException {
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adv.advertiseCapability(OPTION_NO_PROGRESS);
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adv.setDerefTags(true);
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refs = db.getAllRefs();
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adv.send(refs.values());
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adv.send(refs);
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adv.end();
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}
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