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mojo/shell/android/background_application_loader.cc

+// Copyright 2014 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/background_application_loader.h"
+
+#include "base/bind.h"
+#include "base/run_loop.h"
+#include "mojo/shell/application_manager/application_manager.h"
+
+namespace mojo {
+namespace shell {
+
+BackgroundApplicationLoader::BackgroundApplicationLoader(
+    scoped_ptr<ApplicationLoader> real_loader,
+    const std::string& thread_name,
+    base::MessageLoop::Type message_loop_type)
+    : loader_(real_loader.Pass()),
+      message_loop_type_(message_loop_type),
+      thread_name_(thread_name),
+      message_loop_created_(true, false) {
+}
+
+BackgroundApplicationLoader::~BackgroundApplicationLoader() {
+  if (thread_)
+    thread_->Join();
+}
+
+void BackgroundApplicationLoader::Load(
+    const GURL& url,
+    InterfaceRequest<Application> application_request) {
+  DCHECK(application_request.is_pending());
+  if (!thread_) {
+    // TODO(tim): It'd be nice if we could just have each Load call
+    // result in a new thread like DynamicService{Loader, Runner}. But some
+    // loaders are creating multiple ApplicationImpls (NetworkApplicationLoader)
+    // sharing a delegate (etc). So we have to keep it single threaded, wait
+    // for the thread to initialize, and post to the TaskRunner for subsequent
+    // Load calls for now.
+    thread_.reset(new base::DelegateSimpleThread(this, thread_name_));
+    thread_->Start();
+    message_loop_created_.Wait();
+    DCHECK(task_runner_.get());
+  }
+
+  task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&BackgroundApplicationLoader::LoadOnBackgroundThread,
+                 base::Unretained(this), url,
+                 base::Passed(&application_request)));
+}
+
+void BackgroundApplicationLoader::Run() {
+  base::MessageLoop message_loop(message_loop_type_);
+  base::RunLoop loop;
+  task_runner_ = message_loop.task_runner();
+  quit_closure_ = loop.QuitClosure();
+  message_loop_created_.Signal();
+  loop.Run();
+
+  // Destroy |loader_| on the thread it's actually used on.
+  loader_.reset();
+}
+
+void BackgroundApplicationLoader::LoadOnBackgroundThread(
+    const GURL& url,
+    InterfaceRequest<Application> application_request) {
+  DCHECK(task_runner_->RunsTasksOnCurrentThread());
+  loader_->Load(url, application_request.Pass());
+}
+
+}  // namespace shell
+}  // namespace mojo