Embed a mojo ApplicationManager in content/browser

mojo/shell/static_application_loader.h

+// 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.
+
+#ifndef MOJO_SHELL_STATIC_APPLICATION_LOADER_H_
+#define MOJO_SHELL_STATIC_APPLICATION_LOADER_H_
+
+#include <list>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "mojo/shell/application_loader.h"
+
+namespace base {
+class SimpleThread;
+}
+
+namespace mojo {
+class ApplicationDelegate;
+}
+
+namespace mojo {
+namespace shell {
+
+// An ApplicationLoader which loads a single type of app from a given
+// ApplicationDelegate factory. A Load() request is fulfilled by creating an
+// instance of the app on a new thread. Only one instance of the app will run at
+// a time. Any Load requests received while the app is running will be dropped.
+class StaticApplicationLoader : public mojo::shell::ApplicationLoader {
+ public:
+  using ApplicationFactory =
+      base::Callback<scoped_ptr<mojo::ApplicationDelegate>()>;
+
+  // Constructs a static loader for |factory|.
+  explicit StaticApplicationLoader(const ApplicationFactory& factory);
+
+  // Constructs a static loader for |factory| with a closure that will be called
+  // when the loaded application quits.
+  StaticApplicationLoader(const ApplicationFactory& factory,
+                          const base::Closure& quit_callback);
+
+  ~StaticApplicationLoader() override;
+
+  // mojo::shell::ApplicationLoader:
+  void Load(const GURL& url,
+            mojo::InterfaceRequest<mojo::Application> request) override;
+
+ private:
+  void StopAppThread();
+
+  // The factory used t create new instances of the application delegate.
+  ApplicationFactory factory_;
+
+  // If not null, this is run when the loaded application quits.
+  base::Closure quit_callback_;
+
+  // Thread for the application if currently running.
+  scoped_ptr<base::SimpleThread> thread_;
+
+  base::WeakPtrFactory<StaticApplicationLoader> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(StaticApplicationLoader);
+};
+
+}  // namespace shell
+}  // namespace mojo
+
+#endif  // MOJO_SHELL_STATIC_APPLICATION_LOADER_H_