167 lines
5.5 KiB
Java
167 lines
5.5 KiB
Java
// Copyright (C) 2016 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;
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import static com.google.common.base.Preconditions.checkArgument;
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import com.google.common.annotations.VisibleForTesting;
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import com.google.common.collect.ImmutableList;
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import com.google.gerrit.metrics.Description;
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import com.google.gerrit.metrics.Description.Units;
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import com.google.gerrit.metrics.Field;
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import com.google.gerrit.metrics.MetricMaker;
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import com.google.gerrit.metrics.Timer2;
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import com.google.gerrit.reviewdb.server.ReviewDb;
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import com.google.gerrit.server.config.AllProjectsName;
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import com.google.gerrit.server.config.AllUsersName;
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import com.google.gerrit.server.config.GerritServerConfig;
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import com.google.gerrit.server.extensions.events.GitReferenceUpdated;
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import com.google.gerrit.server.git.GitRepositoryManager;
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import com.google.gerrit.server.notedb.NotesMigration;
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import com.google.gerrit.server.notedb.RepoSequence;
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import com.google.gwtorm.server.OrmException;
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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 java.util.ArrayList;
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import java.util.List;
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import org.eclipse.jgit.lib.Config;
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@Singleton
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public class Sequences {
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public static final String NAME_ACCOUNTS = "accounts";
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public static final String NAME_GROUPS = "groups";
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public static final String NAME_CHANGES = "changes";
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public static int getChangeSequenceGap(Config cfg) {
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return cfg.getInt("noteDb", "changes", "initialSequenceGap", 1000);
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}
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private enum SequenceType {
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ACCOUNTS,
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CHANGES,
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GROUPS;
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}
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private final Provider<ReviewDb> db;
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private final NotesMigration migration;
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private final RepoSequence accountSeq;
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private final RepoSequence changeSeq;
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private final RepoSequence groupSeq;
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private final Timer2<SequenceType, Boolean> nextIdLatency;
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@Inject
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public Sequences(
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@GerritServerConfig Config cfg,
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Provider<ReviewDb> db,
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NotesMigration migration,
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GitRepositoryManager repoManager,
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GitReferenceUpdated gitRefUpdated,
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AllProjectsName allProjects,
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AllUsersName allUsers,
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MetricMaker metrics) {
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this.db = db;
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this.migration = migration;
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int accountBatchSize = cfg.getInt("noteDb", "accounts", "sequenceBatchSize", 1);
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accountSeq =
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new RepoSequence(
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repoManager,
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gitRefUpdated,
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allUsers,
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NAME_ACCOUNTS,
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() -> ReviewDb.FIRST_ACCOUNT_ID,
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accountBatchSize);
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int gap = getChangeSequenceGap(cfg);
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@SuppressWarnings("deprecation")
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RepoSequence.Seed changeSeed = () -> db.get().nextChangeId() + gap;
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int changeBatchSize = cfg.getInt("noteDb", "changes", "sequenceBatchSize", 20);
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changeSeq =
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new RepoSequence(
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repoManager, gitRefUpdated, allProjects, NAME_CHANGES, changeSeed, changeBatchSize);
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RepoSequence.Seed groupSeed = () -> nextGroupId(db.get());
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int groupBatchSize = 1;
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groupSeq =
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new RepoSequence(
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repoManager, gitRefUpdated, allUsers, NAME_GROUPS, groupSeed, groupBatchSize);
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nextIdLatency =
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metrics.newTimer(
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"sequence/next_id_latency",
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new Description("Latency of requesting IDs from repo sequences")
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.setCumulative()
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.setUnit(Units.MILLISECONDS),
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Field.ofEnum(SequenceType.class, "sequence"),
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Field.ofBoolean("multiple"));
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}
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public int nextAccountId() throws OrmException {
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try (Timer2.Context timer = nextIdLatency.start(SequenceType.ACCOUNTS, false)) {
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return accountSeq.next();
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}
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}
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public int nextChangeId() throws OrmException {
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if (!migration.readChangeSequence()) {
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return nextChangeId(db.get());
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}
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try (Timer2.Context timer = nextIdLatency.start(SequenceType.CHANGES, false)) {
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return changeSeq.next();
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}
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}
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public ImmutableList<Integer> nextChangeIds(int count) throws OrmException {
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if (migration.readChangeSequence()) {
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try (Timer2.Context timer = nextIdLatency.start(SequenceType.CHANGES, count > 1)) {
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return changeSeq.next(count);
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}
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}
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if (count == 0) {
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return ImmutableList.of();
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}
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checkArgument(count > 0, "count is negative: %s", count);
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List<Integer> ids = new ArrayList<>(count);
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ReviewDb db = this.db.get();
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for (int i = 0; i < count; i++) {
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ids.add(nextChangeId(db));
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}
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return ImmutableList.copyOf(ids);
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}
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public int nextGroupId() throws OrmException {
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try (Timer2.Context timer = nextIdLatency.start(SequenceType.GROUPS, false)) {
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return groupSeq.next();
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}
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}
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@VisibleForTesting
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public RepoSequence getChangeIdRepoSequence() {
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return changeSeq;
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}
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@SuppressWarnings("deprecation")
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private static int nextChangeId(ReviewDb db) throws OrmException {
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return db.nextChangeId();
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}
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@SuppressWarnings("deprecation")
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static int nextGroupId(ReviewDb db) throws OrmException {
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return db.nextAccountGroupId();
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}
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}
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