Separate mojo/shell into a runner and the application manager (shell)

mojo/shell/android/main.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 "mojo/shell/android/main.h"
-
-#include "base/android/fifo_utils.h"
-#include "base/android/jni_android.h"
-#include "base/android/jni_array.h"
-#include "base/android/jni_string.h"
-#include "base/at_exit.h"
-#include "base/bind.h"
-#include "base/command_line.h"
-#include "base/files/file_path.h"
-#include "base/files/file_util.h"
-#include "base/lazy_instance.h"
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/message_loop/message_loop.h"
-#include "base/run_loop.h"
-#include "base/threading/simple_thread.h"
-#include "jni/ShellMain_jni.h"
-#include "mojo/common/message_pump_mojo.h"
-#include "mojo/shell/android/android_handler_loader.h"
-#include "mojo/shell/android/background_application_loader.h"
-#include "mojo/shell/android/native_viewport_application_loader.h"
-#include "mojo/shell/android/ui_application_loader_android.h"
-#include "mojo/shell/application_manager/application_loader.h"
-#include "mojo/shell/context.h"
-#include "mojo/shell/init.h"
-#include "ui/gl/gl_surface_egl.h"
-
-using base::LazyInstance;
-
-namespace mojo {
-namespace shell {
-
-namespace {
-
-// Tag for logging.
-const char kLogTag[] = "chromium";
-
-// Command line argument for the communication fifo.
-const char kFifoPath[] = "fifo-path";
-
-class MojoShellRunner : public base::DelegateSimpleThread::Delegate {
- public:
-  MojoShellRunner(const std::vector<std::string>& parameters) {}
-  ~MojoShellRunner() override {}
-
- private:
-  void Run() override;
-
-  DISALLOW_COPY_AND_ASSIGN(MojoShellRunner);
-};
-
-LazyInstance<scoped_ptr<base::MessageLoop>> g_java_message_loop =
-    LAZY_INSTANCE_INITIALIZER;
-
-LazyInstance<scoped_ptr<Context>> g_context = LAZY_INSTANCE_INITIALIZER;
-
-LazyInstance<scoped_ptr<MojoShellRunner>> g_shell_runner =
-    LAZY_INSTANCE_INITIALIZER;
-
-LazyInstance<scoped_ptr<base::DelegateSimpleThread>> g_shell_thread =
-    LAZY_INSTANCE_INITIALIZER;
-
-LazyInstance<base::android::ScopedJavaGlobalRef<jobject>> g_main_activiy =
-    LAZY_INSTANCE_INITIALIZER;
-
-void ConfigureAndroidServices(Context* context) {
-  context->application_manager()->SetLoaderForURL(
-      make_scoped_ptr(new UIApplicationLoader(
-          make_scoped_ptr(new NativeViewportApplicationLoader()),
-          g_java_message_loop.Get().get())),
-      GURL("mojo:native_viewport_service"));
-
-  // Android handler is bundled with the Mojo shell, because it uses the
-  // MojoShell application as the JNI bridge to bootstrap execution of other
-  // Android Mojo apps that need JNI.
-  context->application_manager()->SetLoaderForURL(
-      make_scoped_ptr(new BackgroundApplicationLoader(
-          make_scoped_ptr(new AndroidHandlerLoader()), "android_handler",
-          base::MessageLoop::TYPE_DEFAULT)),
-      GURL("mojo:android_handler"));
-}
-
-void QuitShellThread() {
-  g_shell_thread.Get()->Join();
-  g_shell_thread.Pointer()->reset();
-  Java_ShellMain_finishActivity(base::android::AttachCurrentThread(),
-                                g_main_activiy.Get().obj());
-  exit(0);
-}
-
-void MojoShellRunner::Run() {
-  base::MessageLoop loop(common::MessagePumpMojo::Create());
-  Context* context = g_context.Pointer()->get();
-  ConfigureAndroidServices(context);
-  context->Init();
-
-  context->Run(GURL("mojo:window_manager"));
-  loop.Run();
-
-  g_java_message_loop.Pointer()->get()->PostTask(FROM_HERE,
-                                                 base::Bind(&QuitShellThread));
-}
-
-// Initialize stdout redirection if the command line switch is present.
-void InitializeRedirection() {
-  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(kFifoPath))
-    return;
-
-  base::FilePath fifo_path =
-      base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(kFifoPath);
-  base::FilePath directory = fifo_path.DirName();
-  CHECK(base::CreateDirectoryAndGetError(directory, nullptr))
-      << "Unable to create directory: " << directory.value();
-  unlink(fifo_path.value().c_str());
-  CHECK(base::android::CreateFIFO(fifo_path, 0666))
-      << "Unable to create fifo: " << fifo_path.value();
-  CHECK(base::android::RedirectStream(stdout, fifo_path, "w"))
-      << "Failed to redirect stdout to file: " << fifo_path.value();
-  CHECK(dup2(STDOUT_FILENO, STDERR_FILENO) != -1)
-      << "Unable to redirect stderr to stdout.";
-}
-
-}  // namespace
-
-static void Init(JNIEnv* env,
-                 jclass clazz,
-                 jobject activity,
-                 jstring mojo_shell_path,
-                 jobjectArray jparameters,
-                 jstring j_local_apps_directory,
-                 jstring j_tmp_dir) {
-  g_main_activiy.Get().Reset(env, activity);
-
-  // Setting the TMPDIR environment variable so that applications can use it.
-  // TODO(qsr) We will need our subprocesses to inherit this.
-  int return_value =
-      setenv("TMPDIR",
-             base::android::ConvertJavaStringToUTF8(env, j_tmp_dir).c_str(), 1);
-  DCHECK_EQ(return_value, 0);
-
-  base::android::ScopedJavaLocalRef<jobject> scoped_activity(env, activity);
-  base::android::InitApplicationContext(env, scoped_activity);
-
-  std::vector<std::string> parameters;
-  parameters.push_back(
-      base::android::ConvertJavaStringToUTF8(env, mojo_shell_path));
-  base::android::AppendJavaStringArrayToStringVector(env, jparameters,
-                                                     &parameters);
-  base::CommandLine::Init(0, nullptr);
-  base::CommandLine::ForCurrentProcess()->InitFromArgv(parameters);
-  g_shell_runner.Get().reset(new MojoShellRunner(parameters));
-
-  InitializeLogging();
-
-  InitializeRedirection();
-
-  // We want ~MessageLoop to happen prior to ~Context. Initializing
-  // LazyInstances is akin to stack-allocating objects; their destructors
-  // will be invoked first-in-last-out.
-  Context* shell_context = new Context();
-  shell_context->SetShellFileRoot(base::FilePath(
-      base::android::ConvertJavaStringToUTF8(env, j_local_apps_directory)));
-  g_context.Get().reset(shell_context);
-
-  g_java_message_loop.Get().reset(new base::MessageLoopForUI);
-  base::MessageLoopForUI::current()->Start();
-
-  // TODO(abarth): At which point should we switch to cross-platform
-  // initialization?
-
-  gfx::GLSurface::InitializeOneOff();
-}
-
-static jboolean Start(JNIEnv* env, jclass clazz) {
-  if (!base::CommandLine::ForCurrentProcess()->GetArgs().size())
-    return false;
-
-#if defined(MOJO_SHELL_DEBUG_URL)
-  base::CommandLine::ForCurrentProcess()->AppendArg(MOJO_SHELL_DEBUG_URL);
-  // Sleep for 5 seconds to give the debugger a chance to attach.
-  sleep(5);
-#endif
-
-  g_shell_thread.Get().reset(new base::DelegateSimpleThread(
-      g_shell_runner.Get().get(), "ShellThread"));
-  g_shell_thread.Get()->Start();
-  return true;
-}
-
-static void AddApplicationURL(JNIEnv* env, jclass clazz, jstring jurl) {
-  base::CommandLine::ForCurrentProcess()->AppendArg(
-      base::android::ConvertJavaStringToUTF8(env, jurl));
-}
-
-bool RegisterShellMain(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
-}  // namespace shell
-}  // namespace mojo
-
-// TODO(vtl): Even though main() should never be called, mojo_shell fails to
-// link without it. Figure out if we can avoid this.
-int main(int argc, char** argv) {
-  NOTREACHED();
-}