| // 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); |
| |
| int groupBatchSize = 1; |
| groupSeq = |
| new RepoSequence( |
| repoManager, |
| gitRefUpdated, |
| allUsers, |
| NAME_GROUPS, |
| () -> ReviewDb.FIRST_GROUP_ID, |
| 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(); |
| } |
| } |