Add assigner support to Blimp

blimp/client/app/android/java/src/org/chromium/blimp/BlimpRendererActivity.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.blimp;
 
 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 
 import org.chromium.base.Log;
 import org.chromium.base.library_loader.ProcessInitException;
 import org.chromium.blimp.auth.RetryingTokenSource;
 import org.chromium.blimp.auth.TokenSource;
 import org.chromium.blimp.auth.TokenSourceImpl;
 import org.chromium.blimp.session.BlimpClientSession;
 import org.chromium.blimp.session.TabControlFeature;
 import org.chromium.blimp.toolbar.Toolbar;
 import org.chromium.ui.widget.Toast;
 
 /**
  * The {@link Activity} for rendering the main Blimp client.  This loads the Blimp rendering stack
  * and displays it.
  */
-public class BlimpRendererActivity extends Activity implements BlimpLibraryLoader.Callback,
-        TokenSource.Callback {
-
+public class BlimpRendererActivity extends Activity
+        implements BlimpLibraryLoader.Callback, TokenSource.Callback, BlimpClientSession.Callback {
     private static final int ACCOUNT_CHOOSER_INTENT_REQUEST_CODE = 100;
     private static final String TAG = "Blimp";
+
+    /** Provides user authentication tokens that can be used to query for engine assignments.  This
+     *  can potentially query GoogleAuthUtil for an OAuth2 authentication token with userinfo.email
+     *  privileges for a chosen Android account. */
     private TokenSource mTokenSource;
+
     private BlimpView mBlimpView;
     private Toolbar mToolbar;
     private BlimpClientSession mBlimpClientSession;
     private TabControlFeature mTabControlFeature;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        // Build a TokenSource that will internally retry accessing the underlying TokenSourceImpl.
+        // This will exponentially backoff while it tries to get the access token.  See
+        // {@link RetryingTokenSource} for more information.  The underlying
+        // TokenSourceImpl will attempt to query GoogleAuthUtil, but might fail if there is no
+        // account selected, in which case it will ask this Activity to show an account chooser and
+        // notify it of the selection result.
         mTokenSource = new RetryingTokenSource(new TokenSourceImpl(this));
         mTokenSource.setCallback(this);
         mTokenSource.getToken();
 
         try {
             BlimpLibraryLoader.startAsync(this, this);
         } catch (ProcessInitException e) {
             Log.e(TAG, "Native startup exception", e);
             System.exit(-1);
             return;
@@ skipping 58 matching lines @@
     @Override
     public void onStartupComplete(boolean success) {
         if (!success) {
             Log.e(TAG, "Native startup failed");
             finish();
             return;
         }
 
         setContentView(R.layout.blimp_main);
 
-        mBlimpClientSession = new BlimpClientSession();
-        mBlimpClientSession.connect();
+        mBlimpClientSession = new BlimpClientSession(this);
 
         mBlimpView = (BlimpView) findViewById(R.id.renderer);
         mBlimpView.initializeRenderer(mBlimpClientSession);
 
         mToolbar = (Toolbar) findViewById(R.id.toolbar);
         mToolbar.initialize(mBlimpClientSession);
 
         mTabControlFeature = new TabControlFeature(mBlimpClientSession, mBlimpView);
         mToolbar.loadUrl("http://www.google.com/");
     }
 
     // TokenSource.Callback implementation.
     @Override
     public void onTokenReceived(String token) {
-        // TODO(dtrainor): Do something with the token and the assigner!
-        Toast.makeText(this, R.string.signin_get_token_succeeded, Toast.LENGTH_SHORT).show();
+        if (mBlimpClientSession != null) mBlimpClientSession.connect(token);
     }
 
     @Override
     public void onTokenUnavailable(boolean isTransient) {
         // Ignore isTransient here because we're relying on the auto-retry TokenSource.
         // TODO(dtrainor): Show a better error dialog/message.
         Toast.makeText(this, R.string.signin_get_token_failed, Toast.LENGTH_LONG).show();
-        finish();
     }
 
     @Override
     public void onNeedsAccountToBeSelected(Intent suggestedIntent) {
         startActivityForResult(suggestedIntent, ACCOUNT_CHOOSER_INTENT_REQUEST_CODE);
     }
+
+    // BlimpClientSession.Callback implementation.
+    @Override
+    public void onAssignmentReceived(int result, int suggestedMessageResourceId) {
+        Toast.makeText(this, suggestedMessageResourceId, Toast.LENGTH_LONG).show();
+    }
 }