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/task_runner.h"
+#include "base/thread_task_runner_handle.h"
+#include "base/threading/simple_thread.h"
+#include "mojo/application/public/cpp/application_delegate.h"
+#include "mojo/application/public/cpp/application_runner.h"
+#include "mojo/application/public/interfaces/application.mojom.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
+
+namespace mojo {
+namespace shell {
+
+namespace {
+
+class RunnerThread : public base::SimpleThread {
+ public:
+  RunnerThread(const GURL& url,
+               InterfaceRequest<Application> request,
+               scoped_refptr<base::TaskRunner> exit_task_runner,
+               const base::Closure& exit_callback,
+               const StaticApplicationLoader::ApplicationFactory& factory)
+      : base::SimpleThread("Mojo Application: " + url.spec()),
+        request_(request.Pass()),
+        exit_task_runner_(exit_task_runner),
+        exit_callback_(exit_callback),
+        factory_(factory) {}
+
+  void Run() override {
+    scoped_ptr<ApplicationRunner> runner(
+        new ApplicationRunner(factory_.Run().release()));
+    runner->Run(request_.PassMessagePipe().release().value(),
+                false /* init_base */);
+    exit_task_runner_->PostTask(FROM_HERE, exit_callback_);
+  }
+
+ private:
+  InterfaceRequest<Application> request_;
+  scoped_refptr<base::TaskRunner> exit_task_runner_;
+  base::Closure exit_callback_;
+  StaticApplicationLoader::ApplicationFactory factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(RunnerThread);
+};
+
+}  // 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;
+
+  // 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_.reset(
+      new RunnerThread(url, request.Pass(), base::ThreadTaskRunnerHandle::Get(),
+                       exit_callback, factory_));
+  thread_->Start();
+}
+
+void StaticApplicationLoader::StopAppThread() {
+  thread_->Join();
+  thread_.reset();
+  if (!quit_callback_.is_null())
+    quit_callback_.Run();
+}
+
+}  // namespace shell
+}  // namespace mojo