Pref service: add a factory to create the client lib

services/preferences/pref_service_factory_unittest.cc

+// Copyright (c) 2017 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 "services/preferences/public/cpp/pref_service_factory.h"
+
+#include "base/files/scoped_temp_dir.h"
+#include "base/memory/ptr_util.h"
+#include "base/message_loop/message_loop.h"
+#include "base/test/sequenced_worker_pool_owner.h"
+#include "components/prefs/pref_change_registrar.h"
+#include "components/prefs/pref_registry_simple.h"
+#include "components/prefs/pref_service.h"
+#include "mojo/public/cpp/bindings/binding_set.h"
+#include "services/preferences/public/cpp/pref_store_manager_impl.h"
+#include "services/preferences/public/interfaces/preferences.mojom.h"
+#include "services/service_manager/public/cpp/interface_factory.h"
+#include "services/service_manager/public/cpp/interface_registry.h"
+#include "services/service_manager/public/cpp/service_context.h"
+#include "services/service_manager/public/cpp/service_test.h"
+#include "services/service_manager/public/interfaces/service_factory.mojom.h"
+
+namespace prefs {
+namespace {
+
+class ServiceTestClient : public service_manager::test::ServiceTestClient,
+                          public service_manager::mojom::ServiceFactory,
+                          public service_manager::InterfaceFactory<
+                              service_manager::mojom::ServiceFactory> {
+ public:
+  ServiceTestClient(service_manager::test::ServiceTest* test,
+                    scoped_refptr<base::SequencedWorkerPool> worker_pool)
+      : service_manager::test::ServiceTestClient(test),
+        worker_pool_(std::move(worker_pool)) {}
+
+ protected:
+  bool OnConnect(const service_manager::ServiceInfo& remote_info,
+                 service_manager::InterfaceRegistry* registry) override {
+    registry->AddInterface<service_manager::mojom::ServiceFactory>(this);
+    return true;
+  }
+
+  void CreateService(service_manager::mojom::ServiceRequest request,
+                     const std::string& name) override {
+    if (name == prefs::mojom::kPrefStoreServiceName) {
+      pref_service_context_.reset(new service_manager::ServiceContext(
+          base::MakeUnique<prefs::PrefStoreManagerImpl>(
+              prefs::PrefStoreManagerImpl::PrefStoreTypes(), worker_pool_),
+          std::move(request)));
+    }
+  }
+
+  void Create(const service_manager::Identity& remote_identity,
+              service_manager::mojom::ServiceFactoryRequest request) override {
+    service_factory_bindings_.AddBinding(this, std::move(request));
+  }
+
+ private:
+  scoped_refptr<base::SequencedWorkerPool> worker_pool_;
+  mojo::BindingSet<service_manager::mojom::ServiceFactory>
+      service_factory_bindings_;
+  std::unique_ptr<service_manager::ServiceContext> pref_service_context_;
+};
+
+constexpr int kInitialValue = 1;
+constexpr int kUpdatedValue = 2;
+constexpr char kKey[] = "some_key";
+
+class PrefServiceFactoryTest : public base::MessageLoop::DestructionObserver,
+                               public service_manager::test::ServiceTest {
+ public:
+  PrefServiceFactoryTest() : ServiceTest("prefs_unittests", false) {}
+
+ protected:
+  void SetUp() override {
+    ServiceTest::SetUp();
+    ASSERT_TRUE(profile_dir_.CreateUniqueTempDir());
+
+    // Init the pref service (in production Chrome startup would do this.)
+    mojom::PrefServiceControlPtr control;
+    connector()->BindInterface(mojom::kPrefStoreServiceName, &control);
+    auto config = mojom::PersistentPrefStoreConfiguration::New();
+    config->set_simple_configuration(
+        mojom::SimplePersistentPrefStoreConfiguration::New(
+            profile_dir_.GetPath().AppendASCII("Preferences")));
+    control->Init(std::move(config));
+  }
+
+  // service_manager::test::ServiceTest:
+  std::unique_ptr<service_manager::Service> CreateService() override {
+    return base::MakeUnique<ServiceTestClient>(this,
+                                               worker_pool_owner_->pool());
+  }
+
+  std::unique_ptr<base::MessageLoop> CreateMessageLoop() override {
+    auto loop = ServiceTest::CreateMessageLoop();
+    worker_pool_owner_ = base::MakeUnique<base::SequencedWorkerPoolOwner>(
+        2, "PrefServiceFactoryTest");
+    loop->AddDestructionObserver(this);
+    return loop;
+  }
+
+  // base::MessageLoop::DestructionObserver
+  void WillDestroyCurrentMessageLoop() override { worker_pool_owner_.reset(); }
+
+  // Create a fully initialized PrefService synchronously.
+  std::unique_ptr<PrefService> Create() {
+    std::unique_ptr<PrefService> pref_service;
+    base::RunLoop run_loop;
+    auto pref_registry = make_scoped_refptr(new PrefRegistrySimple());
+    pref_registry->RegisterIntegerPref(kKey, kInitialValue);
+    ConnectToPrefService(connector(), pref_registry,
+                         base::Bind(&PrefServiceFactoryTest::OnCreate,
+                                    run_loop.QuitClosure(), &pref_service));
+    run_loop.Run();
+    return pref_service;
+  }
+
+  // Wait until first update of the pref |key| in |pref_service| synchronously.
+  void WaitForPrefChange(PrefService* pref_service, const std::string& key) {
+    PrefChangeRegistrar registrar;
+    registrar.Init(pref_service);
+    base::RunLoop run_loop;
+    registrar.Add(key, base::Bind(&OnPrefChanged, run_loop.QuitClosure(), key));
+    run_loop.Run();
+  }
+
+ private:
+  // Called when the PrefService has been initialized.
+  static void OnInit(const base::Closure& quit_closure, bool success) {
+    quit_closure.Run();
+  }
+
+  // Called when the PrefService has been created.
+  static void OnCreate(const base::Closure& quit_closure,
+                       std::unique_ptr<PrefService>* out,
+                       std::unique_ptr<PrefService> pref_service) {
+    DCHECK(pref_service);
+    *out = std::move(pref_service);
+    (*out)->AddPrefInitObserver(
+        base::Bind(PrefServiceFactoryTest::OnInit, quit_closure));
+  }
+
+  static void OnPrefChanged(const base::Closure& quit_closure,
+                            const std::string& expected_path,
+                            const std::string& path) {
+    if (path == expected_path)
+      quit_closure.Run();
+  }
+
+  base::ScopedTempDir profile_dir_;
+  std::unique_ptr<base::SequencedWorkerPoolOwner> worker_pool_owner_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrefServiceFactoryTest);
+};
+
+// Check that a single client can set and read back values.
+TEST_F(PrefServiceFactoryTest, Basic) {
+  auto pref_service = Create();
+
+  // TODO(tibell): Once we have a default store check the value prior to
+  // setting.
+  pref_service->SetInteger(kKey, kUpdatedValue);
+  EXPECT_EQ(kUpdatedValue, pref_service->GetInteger(kKey));
+}
+
+// Check that updates in one client eventually propagates to the other.
+TEST_F(PrefServiceFactoryTest, MultipleClients) {
+  auto pref_service = Create();
+  auto pref_service2 = Create();
+
+  // TODO(tibell): Once we have a default store check the value prior to
+  // setting.
+  pref_service->SetInteger(kKey, kUpdatedValue);
+  WaitForPrefChange(pref_service2.get(), kKey);
+  EXPECT_EQ(kUpdatedValue, pref_service2->GetInteger(kKey));
+}
+
+}  // namespace
+}  // namespace prefs