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There is a newer version: 3.11.0-rc3

// Copyright (C) 2014 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.git;

import com.google.common.collect.Lists;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.extensions.events.LifecycleListener;
import com.google.gerrit.server.config.GcConfig;
import com.google.gerrit.server.project.ProjectCache;
import com.google.inject.Inject;

/** Runnable to enable scheduling gc to run periodically */
public class GarbageCollectionRunner implements Runnable {
  private static final FluentLogger logger = FluentLogger.forEnclosingClass();

  static class Lifecycle implements LifecycleListener {
    private final WorkQueue queue;
    private final GarbageCollectionRunner gcRunner;
    private final GcConfig gcConfig;

    @Inject
    Lifecycle(WorkQueue queue, GarbageCollectionRunner gcRunner, GcConfig config) {
      this.queue = queue;
      this.gcRunner = gcRunner;
      this.gcConfig = config;
    }

    @Override
    public void start() {
      gcConfig.getSchedule().ifPresent(s -> queue.scheduleAtFixedRate(gcRunner, s));
    }

    @Override
    public void stop() {
      // handled by WorkQueue.stop() already
    }
  }

  private final GarbageCollection.Factory garbageCollectionFactory;
  private final ProjectCache projectCache;

  @Inject
  GarbageCollectionRunner(
      GarbageCollection.Factory garbageCollectionFactory, ProjectCache projectCache) {
    this.garbageCollectionFactory = garbageCollectionFactory;
    this.projectCache = projectCache;
  }

  @Override
  public void run() {
    logger.atInfo().log("Triggering gc on all repositories");
    garbageCollectionFactory.create().run(Lists.newArrayList(projectCache.all()));
  }

  @Override
  public String toString() {
    return "GC runner";
  }
}