Various improvements to the Chromoting Android app

remoting/client/jni/chromoting_jni.cc

-// Copyright 2013 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.
-
-#include "remoting/client/jni/chromoting_jni.h"
-
-#include "base/android/base_jni_registrar.h"
-#include "base/android/jni_android.h"
-#include "base/memory/singleton.h"
-#include "media/base/yuv_convert.h"
-#include "net/android/net_jni_registrar.h"
-#include "remoting/base/url_request_context.h"
-
-// Class and package name of the Java class supporting the methods we call.
-const char* const JAVA_CLASS = "org/chromium/chromoting/jni/JniInterface";
-
-namespace remoting {
-
-// static
-ChromotingJni* ChromotingJni::GetInstance() {
-  return Singleton<ChromotingJni>::get();
-}
-
-ChromotingJni::ChromotingJni() {
-  // Obtain a reference to the Java environment. (Future calls to this function
-  // made from the same thread return the same stored reference instead of
-  // repeating the work of attaching to the JVM.)
-  JNIEnv* env = base::android::AttachCurrentThread();
-
-  // The base and networks stacks must be registered with JNI in order to work
-  // on Android. An AtExitManager cleans this up at process exit.
-  at_exit_manager_.reset(new base::AtExitManager());
-  base::android::RegisterJni(env);
-  net::android::RegisterJni(env);
-
-  // On Android, the UI thread is managed by Java, so we need to attach and
-  // start a special type of message loop to allow Chromium code to run tasks.
-  LOG(INFO) << "Starting main message loop";
-  ui_loop_.reset(new base::MessageLoopForUI());
-  ui_loop_->Start();
-
-  LOG(INFO) << "Spawning additional threads";
-  // TODO(solb) Stop pretending to control the managed UI thread's lifetime.
-  ui_task_runner_ = new AutoThreadTaskRunner(ui_loop_->message_loop_proxy(),
-                                             base::MessageLoop::QuitClosure());
-  network_task_runner_ = AutoThread::CreateWithType("native_net",
-                                                    ui_task_runner_,
-                                                    base::MessageLoop::TYPE_IO);
-  display_task_runner_ = AutoThread::Create("native_disp",
-                                            ui_task_runner_);
-
-  url_requester_ = new URLRequestContextGetter(ui_task_runner_,
-                                               network_task_runner_);
-
-  // Allows later decoding of video frames.
-  media::InitializeCPUSpecificYUVConversions();
-
-  class_ = static_cast<jclass>(env->NewGlobalRef(env->FindClass(JAVA_CLASS)));
-}
-
-ChromotingJni::~ChromotingJni() {
-  // The singleton should only ever be destroyed on the main thread.
-  DCHECK(ui_task_runner_->BelongsToCurrentThread());
-
-  // The session must be shut down first, since it depends on our other
-  // components' still being alive.
-  DisconnectFromHost();
-
-  JNIEnv* env = base::android::AttachCurrentThread();
-  env->DeleteGlobalRef(class_);
-  // TODO(solb): crbug.com/259594 Detach all threads from JVM here.
-}
-
-void ChromotingJni::ConnectToHost(const char* username,
-                                  const char* auth_token,
-                                  const char* host_jid,
-                                  const char* host_id,
-                                  const char* host_pubkey) {
-  DCHECK(ui_task_runner_->BelongsToCurrentThread());
-  DCHECK(!session_);
-  session_ = new ChromotingJniInstance(username,
-                                       auth_token,
-                                       host_jid,
-                                       host_id,
-                                       host_pubkey);
-}
-
-void ChromotingJni::DisconnectFromHost() {
-  DCHECK(ui_task_runner_->BelongsToCurrentThread());
-  if (session_) {
-    session_->Cleanup();
-    session_ = NULL;
-  }
-}
-
-void ChromotingJni::ReportConnectionStatus(
-    protocol::ConnectionToHost::State state,
-    protocol::ErrorCode error) {
-  DCHECK(ui_task_runner_->BelongsToCurrentThread());
-
-  JNIEnv* env = base::android::AttachCurrentThread();
-  env->CallStaticVoidMethod(
-    class_,
-    env->GetStaticMethodID(class_, "reportConnectionStatus", "(II)V"),
-    state,
-    error);
-}
-
-void ChromotingJni::DisplayAuthenticationPrompt() {
-  DCHECK(ui_task_runner_->BelongsToCurrentThread());
-
-  JNIEnv* env = base::android::AttachCurrentThread();
-  env->CallStaticVoidMethod(
-      class_,
-      env->GetStaticMethodID(class_, "displayAuthenticationPrompt", "()V"));
-}
-
-void ChromotingJni::UpdateImageBuffer(int width, int height, jobject buffer) {
-  DCHECK(display_task_runner_->BelongsToCurrentThread());
-
-  JNIEnv* env = base::android::AttachCurrentThread();
-  env->SetStaticIntField(
-      class_,
-      env->GetStaticFieldID(class_, "sWidth", "I"),
-      width);
-  env->SetStaticIntField(
-      class_,
-      env->GetStaticFieldID(class_, "sHeight", "I"),
-      height);
-  env->SetStaticObjectField(
-      class_,
-      env->GetStaticFieldID(class_, "sBuffer", "Ljava/nio/ByteBuffer;"),
-      buffer);
-}
-
-void ChromotingJni::RedrawCanvas() {
-  DCHECK(display_task_runner_->BelongsToCurrentThread());
-
-  JNIEnv* env = base::android::AttachCurrentThread();
-  env->CallStaticVoidMethod(
-      class_,
-      env->GetStaticMethodID(class_, "redrawGraphicsInternal", "()V"));
-}
-
-}  // namespace remoting