
This is long overdue renaming step to manifest that SQL database is removed from gerrit core. Moreover, client/server package division was needed due to GWT UI that was removed as well in release 3.0. Bug: Issue 11678 Change-Id: Icfd83a309a6affac54141e7284e70f1255537dc4
175 lines
6.3 KiB
Java
175 lines
6.3 KiB
Java
// Copyright (C) 2012 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.gerrit.server.git;
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import com.google.auto.value.AutoValue;
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import com.google.common.cache.CacheLoader;
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import com.google.common.cache.LoadingCache;
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import com.google.common.flogger.FluentLogger;
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import com.google.gerrit.common.Nullable;
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import com.google.gerrit.common.UsedAt;
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import com.google.gerrit.entities.Change;
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import com.google.gerrit.entities.Project;
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import com.google.gerrit.entities.RefNames;
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import com.google.gerrit.extensions.events.GitReferenceUpdatedListener;
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import com.google.gerrit.extensions.registration.DynamicSet;
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import com.google.gerrit.server.ReviewerSet;
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import com.google.gerrit.server.cache.CacheModule;
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import com.google.gerrit.server.index.change.ChangeField;
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import com.google.gerrit.server.logging.Metadata;
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import com.google.gerrit.server.logging.TraceContext;
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import com.google.gerrit.server.logging.TraceContext.TraceTimer;
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import com.google.gerrit.server.query.change.ChangeData;
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import com.google.gerrit.server.query.change.InternalChangeQuery;
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import com.google.gerrit.server.util.ManualRequestContext;
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import com.google.gerrit.server.util.OneOffRequestContext;
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import com.google.inject.Inject;
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import com.google.inject.Provider;
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import com.google.inject.Singleton;
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import com.google.inject.TypeLiteral;
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import com.google.inject.name.Named;
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import com.google.inject.util.Providers;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.concurrent.ExecutionException;
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/**
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* Cache based on an index query of the most recent changes. The number of cached items depends on
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* the index implementation and configuration.
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*
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* <p>This cache is intended to be used when filtering references. By design it returns only a
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* fraction of all changes. These are the changes that were modified last.
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*/
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@Singleton
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public class SearchingChangeCacheImpl implements GitReferenceUpdatedListener {
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private static final FluentLogger logger = FluentLogger.forEnclosingClass();
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static final String ID_CACHE = "changes";
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public static class Module extends CacheModule {
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private final boolean slave;
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public Module() {
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this(false);
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}
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public Module(boolean slave) {
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this.slave = slave;
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}
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@Override
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protected void configure() {
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if (slave) {
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bind(SearchingChangeCacheImpl.class).toProvider(Providers.of(null));
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} else {
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cache(ID_CACHE, Project.NameKey.class, new TypeLiteral<List<CachedChange>>() {})
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.maximumWeight(0)
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.loader(Loader.class);
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bind(SearchingChangeCacheImpl.class);
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DynamicSet.bind(binder(), GitReferenceUpdatedListener.class)
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.to(SearchingChangeCacheImpl.class);
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}
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}
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}
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@AutoValue
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@UsedAt(UsedAt.Project.GOOGLE)
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public abstract static class CachedChange {
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// Subset of fields in ChangeData, specifically fields needed to serve
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// VisibleRefFilter without touching the database. More can be added as
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// necessary.
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abstract Change change();
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@Nullable
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abstract ReviewerSet reviewers();
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}
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private final LoadingCache<Project.NameKey, List<CachedChange>> cache;
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private final ChangeData.Factory changeDataFactory;
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@Inject
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SearchingChangeCacheImpl(
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@Named(ID_CACHE) LoadingCache<Project.NameKey, List<CachedChange>> cache,
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ChangeData.Factory changeDataFactory) {
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this.cache = cache;
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this.changeDataFactory = changeDataFactory;
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}
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/**
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* Read changes for the project from the secondary index.
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*
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* <p>Returned changes only include the {@code Change} object (with id, branch) and the reviewers.
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* Additional stored fields are not loaded from the index.
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*
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* @param project project to read.
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* @return list of known changes; empty if no changes.
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*/
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public List<ChangeData> getChangeData(Project.NameKey project) {
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try {
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List<CachedChange> cached = cache.get(project);
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List<ChangeData> cds = new ArrayList<>(cached.size());
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for (CachedChange cc : cached) {
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ChangeData cd = changeDataFactory.create(cc.change());
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cd.setReviewers(cc.reviewers());
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cds.add(cd);
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}
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return Collections.unmodifiableList(cds);
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} catch (ExecutionException e) {
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logger.atWarning().withCause(e).log("Cannot fetch changes for %s", project);
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return Collections.emptyList();
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}
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}
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@Override
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public void onGitReferenceUpdated(GitReferenceUpdatedListener.Event event) {
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if (event.getRefName().startsWith(RefNames.REFS_CHANGES)) {
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cache.invalidate(Project.nameKey(event.getProjectName()));
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}
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}
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static class Loader extends CacheLoader<Project.NameKey, List<CachedChange>> {
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private final OneOffRequestContext requestContext;
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private final Provider<InternalChangeQuery> queryProvider;
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@Inject
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Loader(OneOffRequestContext requestContext, Provider<InternalChangeQuery> queryProvider) {
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this.requestContext = requestContext;
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this.queryProvider = queryProvider;
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}
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@Override
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public List<CachedChange> load(Project.NameKey key) throws Exception {
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try (TraceTimer timer =
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TraceContext.newTimer(
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"Loading changes of project", Metadata.builder().projectName(key.get()).build());
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ManualRequestContext ctx = requestContext.open()) {
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List<ChangeData> cds =
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queryProvider
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.get()
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.setRequestedFields(ChangeField.CHANGE, ChangeField.REVIEWER)
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.byProject(key);
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List<CachedChange> result = new ArrayList<>(cds.size());
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for (ChangeData cd : cds) {
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result.add(
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new AutoValue_SearchingChangeCacheImpl_CachedChange(cd.change(), cd.getReviewers()));
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}
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return Collections.unmodifiableList(result);
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}
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}
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}
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}
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