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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 static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.base.Strings;

/**
 * Represents a service exposed from the Admin SDK (e.g. auth, database). Each instance of this
 * class is associated with exactly one instance of FirebaseApp. Also provides a lifecycle hook
 * to gracefully tear down the service.
 *
 * @param  Type of the service
 */
public abstract class FirebaseService {

  private final String id;
  protected final T instance;

  protected FirebaseService(String id, T instance) {
    checkArgument(!Strings.isNullOrEmpty(id));
    this.id = id;
    this.instance = checkNotNull(instance);
  }

  /**
   * Returns the ID used to identify this FirebaseService. Implementations must return a string
   * unique to this service (e.g. full qualified class name of the service type).
   *
   * @return an ID string unique to this service type
   */
  public final String getId() {
    return id;
  }

  /**
   * Returns the concrete object instance that provides a specific Firebase service.
   *
   * @return the service object wrapped in this FirebaseService instance
   */
  public final T getInstance() {
    return instance;
  }

  /**
   * Tear down this FirebaseService instance and the service object wrapped in it, cleaning up
   * any allocated resources in the process.
   */
  public abstract void destroy();
}