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This is the official Firebase Admin Java SDK. Build extraordinary native JVM apps in minutes with Firebase. The Firebase platform can power your app’s backend, user authentication, static hosting, and more.

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/*
 * Copyright 2017 Google Inc.
 *
 * 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.firebase.internal;

import com.google.firebase.FirebaseApp;
import com.google.firebase.ThreadManager;

import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/** Default ThreadManager implementations used by the Admin SDK. */
public class FirebaseThreadManagers {

  private static final Logger logger = LoggerFactory.getLogger(FirebaseThreadManagers.class);

  public static final ThreadManager DEFAULT_THREAD_MANAGER = new DefaultThreadManager();

  /**
   * An abstract ThreadManager implementation that uses the same executor service
   * across all active apps. The executor service is initialized when the first app is initialized,
   * and terminated when the last app is deleted. This class is thread safe.
   */
  abstract static class GlobalThreadManager extends ThreadManager {

    private final Object lock = new Object();
    private final Set apps = new HashSet<>();
    private ExecutorService executorService;

    @Override
    protected ExecutorService getExecutor(FirebaseApp app) {
      synchronized (lock) {
        if (executorService == null) {
          executorService = doInit();
        }
        apps.add(app.getName());
        return executorService;
      }
    }

    @Override
    protected void releaseExecutor(FirebaseApp app, ExecutorService executor) {
      synchronized (lock) {
        if (apps.remove(app.getName()) && apps.isEmpty()) {
          doCleanup(executorService);
          executorService = null;
        }
      }
    }

    /**
     * Initializes the executor service. Called when the first application is initialized.
     */
    protected abstract ExecutorService doInit();

    /**
     * Cleans up the executor service. Called when the last application is deleted.
     */
    protected abstract void doCleanup(ExecutorService executorService);
  }

  private static class DefaultThreadManager extends GlobalThreadManager {

    @Override
    protected ExecutorService doInit() {
      ThreadFactory threadFactory = FirebaseScheduledExecutor.getThreadFactoryWithName(
          getThreadFactory(), "firebase-default-%d");
      return Executors.newCachedThreadPool(threadFactory);
    }

    @Override
    protected void doCleanup(ExecutorService executorService) {
      logger.debug("Shutting down default executor");
      executorService.shutdownNow();
    }

    @Override
    protected ThreadFactory getThreadFactory() {
      return Executors.defaultThreadFactory();
    }
  }
}