Embed a mojo ApplicationManager in content/browser

mojo/shell/static_application_loader.cc

+// 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.
+
+#include "mojo/shell/static_application_loader.h"
+
+#include "base/bind.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/run_loop.h"
+#include "base/task_runner.h"
+#include "base/thread_task_runner_handle.h"
+#include "base/threading/thread.h"
+#include "mojo/application/public/cpp/application_delegate.h"
+#include "mojo/application/public/cpp/application_impl.h"
+#include "mojo/application/public/interfaces/application.mojom.h"
+#include "mojo/common/message_pump_mojo.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
+
+namespace mojo {
+namespace shell {
+
+namespace {
+
+void RunAppOnOwnThread(
+    InterfaceRequest<Application> request,
+    scoped_refptr<base::TaskRunner> exit_task_runner,
+    const base::Closure& exit_callback,
+    const StaticApplicationLoader::ApplicationFactory& factory) {
+  base::RunLoop run_loop;
+  scoped_ptr<ApplicationDelegate> delegate(factory.Run());
+  scoped_ptr<ApplicationImpl> application(new ApplicationImpl(
+      delegate.get(), request.Pass(), run_loop.QuitClosure()));
+  run_loop.Run();
+  exit_task_runner->PostTask(FROM_HERE, exit_callback);
+}
+
+}  // namespace
+
+StaticApplicationLoader::StaticApplicationLoader(
+    const ApplicationFactory& factory)
+    : StaticApplicationLoader(factory, base::Closure()) {
+}
+
+StaticApplicationLoader::StaticApplicationLoader(
+    const ApplicationFactory& factory,
+    const base::Closure& quit_callback)
+    : factory_(factory), quit_callback_(quit_callback), weak_factory_(this) {
+}
+
+StaticApplicationLoader::~StaticApplicationLoader() {
+  if (thread_)
+    StopAppThread();
+}
+
+void StaticApplicationLoader::Load(const GURL& url,
+                                   InterfaceRequest<Application> request) {
+  if (thread_)
+    return;
+
+  thread_.reset(new base::Thread("Mojo Application: " + url.spec()));
+
+  base::Thread::Options options;
+  options.message_pump_factory =
+      base::Bind(&mojo::common::MessagePumpMojo::Create);
+  thread_->StartWithOptions(options);
+
+  // If the application's thread quits on its own before this loader dies, we
+  // reset the Thread object, allowing future Load requests to be fulfilled
+  // with a new app instance.
+  auto exit_callback = base::Bind(&StaticApplicationLoader::StopAppThread,
+                                  weak_factory_.GetWeakPtr());
+  thread_->task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&RunAppOnOwnThread, base::Passed(&request),
+                 base::ThreadTaskRunnerHandle::Get(), exit_callback, factory_));
+}
+
+void StaticApplicationLoader::StopAppThread() {
+  thread_.reset();
+  if (!quit_callback_.is_null())
+    quit_callback_.Run();
+}
+
+}  // namespace shell
+}  // namespace mojo