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// Copyright (C) 2016 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.gerrit.server.restapi.change;
import static java.util.stream.Collectors.toList;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableList;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.entities.Account;
import com.google.gerrit.extensions.client.ReviewerState;
import com.google.gerrit.index.query.QueryParseException;
import com.google.gerrit.server.FanOutExecutor;
import com.google.gerrit.server.account.AccountCache;
import com.google.gerrit.server.account.AccountState;
import com.google.gerrit.server.approval.ApprovalsUtil;
import com.google.gerrit.server.change.ReviewerSuggestion;
import com.google.gerrit.server.change.SuggestedReviewer;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.index.change.ChangeField;
import com.google.gerrit.server.notedb.ChangeNotes;
import com.google.gerrit.server.notedb.ReviewerStateInternal;
import com.google.gerrit.server.plugincontext.PluginMapContext;
import com.google.gerrit.server.project.ProjectState;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gerrit.server.query.change.ChangeQueryBuilder;
import com.google.gerrit.server.query.change.InternalChangeQuery;
import com.google.inject.Inject;
import com.google.inject.Provider;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.stream.Stream;
import org.apache.commons.lang3.mutable.MutableDouble;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.lib.Config;
public class ReviewerRecommender {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private static final long PLUGIN_QUERY_TIMEOUT = 500; // ms
private final ChangeQueryBuilder changeQueryBuilder;
private final Config config;
private final PluginMapContext reviewerSuggestionPluginMap;
private final Provider queryProvider;
private final ExecutorService executor;
private final ApprovalsUtil approvalsUtil;
private final AccountCache accountCache;
@Inject
ReviewerRecommender(
ChangeQueryBuilder changeQueryBuilder,
PluginMapContext reviewerSuggestionPluginMap,
Provider queryProvider,
@FanOutExecutor ExecutorService executor,
ApprovalsUtil approvalsUtil,
@GerritServerConfig Config config,
AccountCache accountCache) {
this.changeQueryBuilder = changeQueryBuilder;
this.config = config;
this.queryProvider = queryProvider;
this.reviewerSuggestionPluginMap = reviewerSuggestionPluginMap;
this.executor = executor;
this.approvalsUtil = approvalsUtil;
this.accountCache = accountCache;
}
public List suggestReviewers(
ReviewerState reviewerState,
@Nullable ChangeNotes changeNotes,
SuggestReviewers suggestReviewers,
ProjectState projectState,
List candidateList)
throws IOException, ConfigInvalidException {
logger.atFine().log("Candidates %s", candidateList);
String query = suggestReviewers.getQuery();
logger.atFine().log("query: %s", query);
double baseWeight = config.getInt("addReviewer", "baseWeight", 1);
logger.atFine().log("base weight: %s", baseWeight);
Map reviewerScores = baseRanking(baseWeight, query, candidateList);
logger.atFine().log("Base reviewer scores: %s", reviewerScores);
// Send the query along with a candidate list to all plugins and merge the
// results. Plugins don't necessarily need to use the candidates list, they
// can also return non-candidate account ids.
List>> tasks =
new ArrayList<>(reviewerSuggestionPluginMap.plugins().size());
List weights = new ArrayList<>(reviewerSuggestionPluginMap.plugins().size());
reviewerSuggestionPluginMap.runEach(
extension -> {
tasks.add(
() ->
extension
.get()
.suggestReviewers(
projectState.getNameKey(),
changeNotes != null ? changeNotes.getChangeId() : null,
query,
reviewerScores.keySet()));
String key = extension.getPluginName() + "-" + extension.getExportName();
String pluginWeight = config.getString("addReviewer", key, "weight");
if (Strings.isNullOrEmpty(pluginWeight)) {
pluginWeight = "1";
}
logger.atFine().log("weight for %s: %s", key, pluginWeight);
try {
weights.add(Double.parseDouble(pluginWeight));
} catch (NumberFormatException e) {
logger.atSevere().withCause(e).log("Exception while parsing weight for %s", key);
weights.add(1d);
}
});
try {
List>> futures =
executor.invokeAll(tasks, PLUGIN_QUERY_TIMEOUT, TimeUnit.MILLISECONDS);
Iterator weightIterator = weights.iterator();
for (Future> f : futures) {
double weight = weightIterator.next();
for (SuggestedReviewer s : f.get()) {
if (reviewerScores.containsKey(s.account)) {
reviewerScores.get(s.account).add(s.score * weight);
} else {
reviewerScores.put(s.account, new MutableDouble(s.score * weight));
}
}
}
logger.atFine().log("Reviewer scores: %s", reviewerScores);
} catch (ExecutionException | InterruptedException e) {
logger.atSevere().withCause(e).log("Exception while suggesting reviewers");
return ImmutableList.of();
}
if (changeNotes != null) {
// Remove change owner
if (reviewerScores.remove(changeNotes.getChange().getOwner()) != null) {
logger.atFine().log("Remove change owner %s", changeNotes.getChange().getOwner());
}
// Remove existing reviewers
approvalsUtil
.getReviewers(changeNotes)
.byState(ReviewerStateInternal.fromReviewerState(reviewerState))
.forEach(
r -> {
if (reviewerScores.remove(r) != null) {
logger.atFine().log("Remove existing reviewer %s", r);
}
});
}
// Sort results
Stream> sorted =
reviewerScores.entrySet().stream()
.sorted(Map.Entry.comparingByValue(Collections.reverseOrder()));
List sortedSuggestions = sorted.map(Map.Entry::getKey).collect(toList());
logger.atFine().log("Sorted suggestions: %s", sortedSuggestions);
return sortedSuggestions;
}
/**
* @param baseWeight The weight applied to the ordering of the reviewers.
* @param query Query to match. For example, it can try to match all users that start with "Ab".
* @param candidateList The list of candidates based on the query. If query is empty, this list is
* also empty.
* @return Map of account ids that match the query and their appropriate ranking (the better the
* ranking, the better it is to suggest them as reviewers).
* @throws IOException Can't find owner="self" account.
* @throws ConfigInvalidException Can't find owner="self" account.
*/
private Map baseRanking(
double baseWeight, String query, List candidateList)
throws IOException, ConfigInvalidException {
int numberOfRelevantChanges = config.getInt("suggest", "relevantChanges", 50);
// Get the user's last numberOfRelevantChanges changes, check reviewers
try {
List result =
queryProvider
.get()
.setLimit(numberOfRelevantChanges)
.setRequestedFields(ChangeField.REVIEWER)
.query(changeQueryBuilder.owner("self"));
Map suggestions = new LinkedHashMap<>();
// Put those candidates at the bottom of the list
candidateList.stream().forEach(id -> suggestions.put(id, new MutableDouble(0)));
for (ChangeData cd : result) {
for (Account.Id reviewer : cd.reviewers().all()) {
if (accountMatchesQuery(reviewer, query)) {
suggestions
.computeIfAbsent(reviewer, (ignored) -> new MutableDouble(0))
.add(baseWeight);
}
}
}
return suggestions;
} catch (QueryParseException e) {
// Unhandled, because owner:self will never provoke a QueryParseException
logger.atSevere().withCause(e).log("Exception while suggesting reviewers");
return new HashMap<>();
}
}
private boolean accountMatchesQuery(Account.Id id, String query) {
Optional account = accountCache.get(id).map(AccountState::account);
if (account.isPresent() && account.get().isActive()) {
if (Strings.isNullOrEmpty(query)
|| (account.get().fullName() != null && account.get().fullName().startsWith(query))
|| (account.get().preferredEmail() != null
&& account.get().preferredEmail().startsWith(query))) {
return true;
}
}
return false;
}
}
