com.google.firebase.database.core.Context Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of firebase-admin Show documentation
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.
There is a newer version: 9.4.1
Show newest version
/*
 * 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.database.core;

import com.google.auth.oauth2.GoogleCredentials;
import com.google.firebase.FirebaseApp;
import com.google.firebase.ImplFirebaseTrampolines;
import com.google.firebase.database.DatabaseException;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.connection.ConnectionAuthTokenProvider;
import com.google.firebase.database.connection.ConnectionContext;
import com.google.firebase.database.connection.HostInfo;
import com.google.firebase.database.connection.PersistentConnection;
import com.google.firebase.database.core.persistence.NoopPersistenceManager;
import com.google.firebase.database.core.persistence.PersistenceManager;
import com.google.firebase.database.utilities.DefaultRunLoop;

import java.util.concurrent.ScheduledExecutorService;

public class Context {

  private static final long DEFAULT_CACHE_SIZE = 10 * 1024 * 1024;

  FirebaseApp firebaseApp;

  EventTarget eventTarget;
  AuthTokenProvider authTokenProvider;
  RunLoop runLoop;
  String persistenceKey;
  boolean persistenceEnabled;
  long cacheSize = DEFAULT_CACHE_SIZE;

  private String userAgent;
  private boolean frozen = false;
  private boolean stopped = false;

  private Platform platform;

  private static ConnectionAuthTokenProvider wrapAuthTokenProvider(
      final AuthTokenProvider provider) {
    return new ConnectionAuthTokenProvider() {
      @Override
      public void getToken(boolean forceRefresh, final GetTokenCallback callback) {
        provider.getToken(
            forceRefresh,
            new AuthTokenProvider.GetTokenCompletionListener() {
              @Override
              public void onSuccess(String token) {
                callback.onSuccess(token);
              }

              @Override
              public void onError(String error) {
                callback.onError(error);
              }
            });
      }
    };
  }

  private Platform getPlatform() {
    if (platform == null) {
      platform = new JvmPlatform(firebaseApp);
    }
    return platform;
  }

  public boolean isStopped() {
    return stopped;
  }

  synchronized void freeze() {
    if (!frozen) {
      frozen = true;
      initServices();
    }
  }

  public void requireStarted() {
    if (stopped) {
      restartServices();
      stopped = false;
    }
  }

  private void initServices() {
    // Cache platform
    getPlatform();
    ensureUserAgent();
    //ensureStorage();
    ensureEventTarget();
    ensureRunLoop();
    ensureSessionIdentifier();
    ensureAuthTokenProvider();
  }

  private void restartServices() {
    eventTarget.restart();
    runLoop.restart();
  }

  void stop() {
    stopped = true;
    if (eventTarget != null) {
      eventTarget.shutdown();
    }
    if (runLoop != null) {
      runLoop.shutdown();
    }
  }

  void assertUnfrozen() {
    if (frozen) {
      throw new DatabaseException(
          "Modifications to DatabaseConfig objects must occur before they are in use");
    }
  }

  public ConnectionContext getConnectionContext() {
    return new ConnectionContext(
        wrapAuthTokenProvider(this.getAuthTokenProvider()),
        this.getExecutorService(),
        this.isPersistenceEnabled(),
        FirebaseDatabase.getSdkVersion(),
        this.getUserAgent(),
        ImplFirebaseTrampolines.getThreadFactory(firebaseApp));
  }

  PersistenceManager getPersistenceManager(String firebaseId) {
    if (this.persistenceEnabled) {
      PersistenceManager cache = platform.createPersistenceManager(this, firebaseId);
      if (cache == null) {
        throw new IllegalArgumentException(
            "You have enabled persistence, but persistence is not supported on "
                + "this platform.");
      }
      return cache;
    } else {
      return new NoopPersistenceManager();
    }
  }

  public boolean isPersistenceEnabled() {
    return this.persistenceEnabled;
  }

  public long getPersistenceCacheSizeBytes() {
    return this.cacheSize;
  }

  public EventTarget getEventTarget() {
    return eventTarget;
  }

  public RunLoop getRunLoop() {
    return runLoop;
  }

  public String getUserAgent() {
    return userAgent;
  }

  public AuthTokenProvider getAuthTokenProvider() {
    return this.authTokenProvider;
  }

  public PersistentConnection newPersistentConnection(
      HostInfo info, PersistentConnection.Delegate delegate) {
    return getPlatform().newPersistentConnection(this, this.getConnectionContext(), info, delegate);
  }

  private ScheduledExecutorService getExecutorService() {
    RunLoop loop = this.getRunLoop();
    if (!(loop instanceof DefaultRunLoop)) {
      // TODO: We really need to remove this option from the public DatabaseConfig
      // object
      throw new RuntimeException("Custom run loops are not supported!");
    }
    return ((DefaultRunLoop) loop).getExecutorService();
  }

  private void ensureRunLoop() {
    if (runLoop == null) {
      runLoop = platform.newRunLoop(this);
    }
  }

  private void ensureEventTarget() {
    if (eventTarget == null) {
      eventTarget = getPlatform().newEventTarget(this);
    }
  }

  private void ensureUserAgent() {
    if (userAgent == null) {
      userAgent = buildUserAgent(getPlatform().getUserAgent(this));
    }
  }

  private void ensureAuthTokenProvider() {
    if (authTokenProvider == null) {
      authTokenProvider = getPlatform().newAuthTokenProvider(this.getExecutorService());
    }
  }

  private void ensureSessionIdentifier() {
    if (persistenceKey == null) {
      persistenceKey = "default";
    }
  }

  private String buildUserAgent(String platformAgent) {
    StringBuilder sb =
        new StringBuilder()
            .append("Firebase/")
            .append(Constants.WIRE_PROTOCOL_VERSION)
            .append("/")
            .append(FirebaseDatabase.getSdkVersion())
            .append("/")
            .append(platformAgent);
    return sb.toString();
  }

  public void setCustomCredentials(GoogleCredentials customCredentials, boolean autoRefresh) {
    // ensure that platform exists
    getPlatform();
    // ensure that runloop exists else we might get a NPE
    this.ensureRunLoop();
    this.authTokenProvider = new JvmAuthTokenProvider(firebaseApp, this.getExecutorService(),
        autoRefresh, customCredentials);
  }
}