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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;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.gerrit.metrics.Description;
import com.google.gerrit.metrics.Description.Units;
import com.google.gerrit.metrics.Field;
import com.google.gerrit.metrics.MetricMaker;
import com.google.gerrit.metrics.Timer2;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.server.config.AllProjectsName;
import com.google.gerrit.server.config.AllUsersName;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.extensions.events.GitReferenceUpdated;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.notedb.NotesMigration;
import com.google.gerrit.server.notedb.RepoSequence;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jgit.lib.Config;
@Singleton
public class Sequences {
public static final String NAME_ACCOUNTS = "accounts";
public static final String NAME_GROUPS = "groups";
public static final String NAME_CHANGES = "changes";
public static int getChangeSequenceGap(Config cfg) {
return cfg.getInt("noteDb", "changes", "initialSequenceGap", 1000);
}
private enum SequenceType {
ACCOUNTS,
CHANGES,
GROUPS;
}
private final Provider<ReviewDb> db;
private final NotesMigration migration;
private final RepoSequence accountSeq;
private final RepoSequence changeSeq;
private final RepoSequence groupSeq;
private final Timer2<SequenceType, Boolean> nextIdLatency;
@Inject
public Sequences(
@GerritServerConfig Config cfg,
Provider<ReviewDb> db,
NotesMigration migration,
GitRepositoryManager repoManager,
GitReferenceUpdated gitRefUpdated,
AllProjectsName allProjects,
AllUsersName allUsers,
MetricMaker metrics) {
this.db = db;
this.migration = migration;
int accountBatchSize = cfg.getInt("noteDb", "accounts", "sequenceBatchSize", 1);
accountSeq =
new RepoSequence(
repoManager,
gitRefUpdated,
allUsers,
NAME_ACCOUNTS,
() -> ReviewDb.FIRST_ACCOUNT_ID,
accountBatchSize);
int gap = getChangeSequenceGap(cfg);
@SuppressWarnings("deprecation")
RepoSequence.Seed changeSeed = () -> db.get().nextChangeId() + gap;
int changeBatchSize = cfg.getInt("noteDb", "changes", "sequenceBatchSize", 20);
changeSeq =
new RepoSequence(
repoManager, gitRefUpdated, allProjects, NAME_CHANGES, changeSeed, changeBatchSize);
RepoSequence.Seed groupSeed = () -> nextGroupId(db.get());
int groupBatchSize = 1;
groupSeq =
new RepoSequence(
repoManager, gitRefUpdated, allUsers, NAME_GROUPS, groupSeed, groupBatchSize);
nextIdLatency =
metrics.newTimer(
"sequence/next_id_latency",
new Description("Latency of requesting IDs from repo sequences")
.setCumulative()
.setUnit(Units.MILLISECONDS),
Field.ofEnum(SequenceType.class, "sequence"),
Field.ofBoolean("multiple"));
}
public int nextAccountId() throws OrmException {
try (Timer2.Context timer = nextIdLatency.start(SequenceType.ACCOUNTS, false)) {
return accountSeq.next();
}
}
public int nextChangeId() throws OrmException {
if (!migration.readChangeSequence()) {
return nextChangeId(db.get());
}
try (Timer2.Context timer = nextIdLatency.start(SequenceType.CHANGES, false)) {
return changeSeq.next();
}
}
public ImmutableList<Integer> nextChangeIds(int count) throws OrmException {
if (migration.readChangeSequence()) {
try (Timer2.Context timer = nextIdLatency.start(SequenceType.CHANGES, count > 1)) {
return changeSeq.next(count);
}
}
if (count == 0) {
return ImmutableList.of();
}
checkArgument(count > 0, "count is negative: %s", count);
List<Integer> ids = new ArrayList<>(count);
ReviewDb db = this.db.get();
for (int i = 0; i < count; i++) {
ids.add(nextChangeId(db));
}
return ImmutableList.copyOf(ids);
}
public int nextGroupId() throws OrmException {
try (Timer2.Context timer = nextIdLatency.start(SequenceType.GROUPS, false)) {
return groupSeq.next();
}
}
@VisibleForTesting
public RepoSequence getChangeIdRepoSequence() {
return changeSeq;
}
@SuppressWarnings("deprecation")
private static int nextChangeId(ReviewDb db) throws OrmException {
return db.nextChangeId();
}
@SuppressWarnings("deprecation")
static int nextGroupId(ReviewDb db) throws OrmException {
return db.nextAccountGroupId();
}
}
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