Fix a race condition in preference metric reporting.

base/prefs/json_pref_store_unittest.cc

 // Copyright (c) 2012 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 "base/prefs/json_pref_store.h"
 
 #include "base/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
+#include "base/prefs/pref_filter.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread.h"
 #include "base/values.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 31 matching lines @@
   base::FilePath data_dir_;
   // A message loop that we can use as the file thread message loop.
   MessageLoop message_loop_;
 };
 
 // Test fallback behavior for a nonexistent file.
 TEST_F(JsonPrefStoreTest, NonExistentFile) {
   base::FilePath bogus_input_file = data_dir_.AppendASCII("read.txt");
   ASSERT_FALSE(PathExists(bogus_input_file));
   scoped_refptr<JsonPrefStore> pref_store = new JsonPrefStore(
-      bogus_input_file, message_loop_.message_loop_proxy().get());
+      bogus_input_file,
+      message_loop_.message_loop_proxy().get(),
+      scoped_ptr<PrefFilter>());
   EXPECT_EQ(PersistentPrefStore::PREF_READ_ERROR_NO_FILE,
             pref_store->ReadPrefs());
   EXPECT_FALSE(pref_store->ReadOnly());
 }
 
 // Test fallback behavior for an invalid file.
 TEST_F(JsonPrefStoreTest, InvalidFile) {
   base::FilePath invalid_file_original = data_dir_.AppendASCII("invalid.json");
   base::FilePath invalid_file = temp_dir_.path().AppendASCII("invalid.json");
   ASSERT_TRUE(base::CopyFile(invalid_file_original, invalid_file));
   scoped_refptr<JsonPrefStore> pref_store =
-      new JsonPrefStore(invalid_file, message_loop_.message_loop_proxy().get());
+      new JsonPrefStore(invalid_file,
+                        message_loop_.message_loop_proxy().get(),
+                        scoped_ptr<PrefFilter>());
   EXPECT_EQ(PersistentPrefStore::PREF_READ_ERROR_JSON_PARSE,
             pref_store->ReadPrefs());
   EXPECT_FALSE(pref_store->ReadOnly());
 
   // The file should have been moved aside.
   EXPECT_FALSE(PathExists(invalid_file));
   base::FilePath moved_aside = temp_dir_.path().AppendASCII("invalid.bad");
   EXPECT_TRUE(PathExists(moved_aside));
   EXPECT_TRUE(TextContentsEqual(invalid_file_original, moved_aside));
 }
@@ skipping 64 matching lines @@
   ASSERT_TRUE(base::DeleteFile(output_file, false));
 }
 
 TEST_F(JsonPrefStoreTest, Basic) {
   ASSERT_TRUE(base::CopyFile(data_dir_.AppendASCII("read.json"),
                                   temp_dir_.path().AppendASCII("write.json")));
 
   // Test that the persistent value can be loaded.
   base::FilePath input_file = temp_dir_.path().AppendASCII("write.json");
   ASSERT_TRUE(PathExists(input_file));
-  scoped_refptr<JsonPrefStore> pref_store =
-      new JsonPrefStore(input_file, message_loop_.message_loop_proxy().get());
+  scoped_refptr<JsonPrefStore> pref_store = new JsonPrefStore(
+      input_file,
+      message_loop_.message_loop_proxy().get(),
+      scoped_ptr<PrefFilter>());
   ASSERT_EQ(PersistentPrefStore::PREF_READ_ERROR_NONE, pref_store->ReadPrefs());
   ASSERT_FALSE(pref_store->ReadOnly());
 
   // The JSON file looks like this:
   // {
   //   "homepage": "http://www.cnn.com",
   //   "some_directory": "/usr/local/",
   //   "tabs": {
   //     "new_windows_in_tabs": true,
   //     "max_tabs": 20
   //   }
   // }
 
   RunBasicJsonPrefStoreTest(
       pref_store.get(), input_file, data_dir_.AppendASCII("write.golden.json"));
 }
 
 TEST_F(JsonPrefStoreTest, BasicAsync) {
   ASSERT_TRUE(base::CopyFile(data_dir_.AppendASCII("read.json"),
                                   temp_dir_.path().AppendASCII("write.json")));
 
   // Test that the persistent value can be loaded.
   base::FilePath input_file = temp_dir_.path().AppendASCII("write.json");
   ASSERT_TRUE(PathExists(input_file));
-  scoped_refptr<JsonPrefStore> pref_store =
-      new JsonPrefStore(input_file, message_loop_.message_loop_proxy().get());
+  scoped_refptr<JsonPrefStore> pref_store = new JsonPrefStore(
+      input_file,
+      message_loop_.message_loop_proxy().get(),
+      scoped_ptr<PrefFilter>());
 
   {
     MockPrefStoreObserver mock_observer;
     pref_store->AddObserver(&mock_observer);
 
     MockReadErrorDelegate* mock_error_delegate = new MockReadErrorDelegate;
     pref_store->ReadPrefsAsync(mock_error_delegate);
 
     EXPECT_CALL(mock_observer, OnInitializationCompleted(true)).Times(1);
     EXPECT_CALL(*mock_error_delegate,
@@ skipping 14 matching lines @@
   //   }
   // }
 
   RunBasicJsonPrefStoreTest(
       pref_store.get(), input_file, data_dir_.AppendASCII("write.golden.json"));
 }
 
 TEST_F(JsonPrefStoreTest, PreserveEmptyValues) {
   FilePath pref_file = temp_dir_.path().AppendASCII("empty_values.json");
 
-  scoped_refptr<JsonPrefStore> pref_store =
-      new JsonPrefStore(pref_file, message_loop_.message_loop_proxy());
+  scoped_refptr<JsonPrefStore> pref_store = new JsonPrefStore(
+      pref_file,
+      message_loop_.message_loop_proxy(),
+      scoped_ptr<PrefFilter>());
 
   // Set some keys with empty values.
   pref_store->SetValue("list", new base::ListValue);
   pref_store->SetValue("dict", new base::DictionaryValue);
 
   // Write to file.
   pref_store->CommitPendingWrite();
   MessageLoop::current()->RunUntilIdle();
 
   // Reload.
-  pref_store = new JsonPrefStore(pref_file, message_loop_.message_loop_proxy());
+  pref_store = new JsonPrefStore(
+      pref_file,
+      message_loop_.message_loop_proxy(),
+      scoped_ptr<PrefFilter>());
   ASSERT_EQ(PersistentPrefStore::PREF_READ_ERROR_NONE, pref_store->ReadPrefs());
   ASSERT_FALSE(pref_store->ReadOnly());
 
   // Check values.
   const Value* result = NULL;
   EXPECT_TRUE(pref_store->GetValue("list", &result));
   EXPECT_TRUE(ListValue().Equals(result));
   EXPECT_TRUE(pref_store->GetValue("dict", &result));
   EXPECT_TRUE(DictionaryValue().Equals(result));
 }
 
 // Tests asynchronous reading of the file when there is no file.
 TEST_F(JsonPrefStoreTest, AsyncNonExistingFile) {
   base::FilePath bogus_input_file = data_dir_.AppendASCII("read.txt");
   ASSERT_FALSE(PathExists(bogus_input_file));
   scoped_refptr<JsonPrefStore> pref_store = new JsonPrefStore(
-      bogus_input_file, message_loop_.message_loop_proxy().get());
+      bogus_input_file,
+      message_loop_.message_loop_proxy().get(),
+      scoped_ptr<PrefFilter>());
   MockPrefStoreObserver mock_observer;
   pref_store->AddObserver(&mock_observer);
 
   MockReadErrorDelegate *mock_error_delegate = new MockReadErrorDelegate;
   pref_store->ReadPrefsAsync(mock_error_delegate);
 
   EXPECT_CALL(mock_observer, OnInitializationCompleted(true)).Times(1);
   EXPECT_CALL(*mock_error_delegate,
               OnError(PersistentPrefStore::PREF_READ_ERROR_NO_FILE)).Times(1);
   RunLoop().RunUntilIdle();
   pref_store->RemoveObserver(&mock_observer);
 
   EXPECT_FALSE(pref_store->ReadOnly());
 }
 
 }  // namespace base