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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "base/files/important_file_writer.h"
      6 
      7 #include "base/compiler_specific.h"
      8 #include "base/file_util.h"
      9 #include "base/files/file_path.h"
     10 #include "base/files/scoped_temp_dir.h"
     11 #include "base/logging.h"
     12 #include "base/message_loop/message_loop.h"
     13 #include "base/run_loop.h"
     14 #include "base/threading/thread.h"
     15 #include "base/time/time.h"
     16 #include "testing/gtest/include/gtest/gtest.h"
     17 
     18 namespace base {
     19 
     20 namespace {
     21 
     22 std::string GetFileContent(const FilePath& path) {
     23   std::string content;
     24   if (!file_util::ReadFileToString(path, &content)) {
     25     NOTREACHED();
     26   }
     27   return content;
     28 }
     29 
     30 class DataSerializer : public ImportantFileWriter::DataSerializer {
     31  public:
     32   explicit DataSerializer(const std::string& data) : data_(data) {
     33   }
     34 
     35   virtual bool SerializeData(std::string* output) OVERRIDE {
     36     output->assign(data_);
     37     return true;
     38   }
     39 
     40  private:
     41   const std::string data_;
     42 };
     43 
     44 }  // namespace
     45 
     46 class ImportantFileWriterTest : public testing::Test {
     47  public:
     48   ImportantFileWriterTest() { }
     49   virtual void SetUp() {
     50     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     51     file_ = temp_dir_.path().AppendASCII("test-file");
     52   }
     53 
     54  protected:
     55   FilePath file_;
     56   MessageLoop loop_;
     57 
     58  private:
     59   ScopedTempDir temp_dir_;
     60 };
     61 
     62 TEST_F(ImportantFileWriterTest, Basic) {
     63   ImportantFileWriter writer(file_, MessageLoopProxy::current().get());
     64   EXPECT_FALSE(PathExists(writer.path()));
     65   writer.WriteNow("foo");
     66   RunLoop().RunUntilIdle();
     67 
     68   ASSERT_TRUE(PathExists(writer.path()));
     69   EXPECT_EQ("foo", GetFileContent(writer.path()));
     70 }
     71 
     72 TEST_F(ImportantFileWriterTest, ScheduleWrite) {
     73   ImportantFileWriter writer(file_, MessageLoopProxy::current().get());
     74   writer.set_commit_interval(TimeDelta::FromMilliseconds(25));
     75   EXPECT_FALSE(writer.HasPendingWrite());
     76   DataSerializer serializer("foo");
     77   writer.ScheduleWrite(&serializer);
     78   EXPECT_TRUE(writer.HasPendingWrite());
     79   MessageLoop::current()->PostDelayedTask(
     80       FROM_HERE,
     81       MessageLoop::QuitWhenIdleClosure(),
     82       TimeDelta::FromMilliseconds(100));
     83   MessageLoop::current()->Run();
     84   EXPECT_FALSE(writer.HasPendingWrite());
     85   ASSERT_TRUE(PathExists(writer.path()));
     86   EXPECT_EQ("foo", GetFileContent(writer.path()));
     87 }
     88 
     89 TEST_F(ImportantFileWriterTest, DoScheduledWrite) {
     90   ImportantFileWriter writer(file_, MessageLoopProxy::current().get());
     91   EXPECT_FALSE(writer.HasPendingWrite());
     92   DataSerializer serializer("foo");
     93   writer.ScheduleWrite(&serializer);
     94   EXPECT_TRUE(writer.HasPendingWrite());
     95   writer.DoScheduledWrite();
     96   MessageLoop::current()->PostDelayedTask(
     97       FROM_HERE,
     98       MessageLoop::QuitWhenIdleClosure(),
     99       TimeDelta::FromMilliseconds(100));
    100   MessageLoop::current()->Run();
    101   EXPECT_FALSE(writer.HasPendingWrite());
    102   ASSERT_TRUE(PathExists(writer.path()));
    103   EXPECT_EQ("foo", GetFileContent(writer.path()));
    104 }
    105 
    106 TEST_F(ImportantFileWriterTest, BatchingWrites) {
    107   ImportantFileWriter writer(file_, MessageLoopProxy::current().get());
    108   writer.set_commit_interval(TimeDelta::FromMilliseconds(25));
    109   DataSerializer foo("foo"), bar("bar"), baz("baz");
    110   writer.ScheduleWrite(&foo);
    111   writer.ScheduleWrite(&bar);
    112   writer.ScheduleWrite(&baz);
    113   MessageLoop::current()->PostDelayedTask(
    114       FROM_HERE,
    115       MessageLoop::QuitWhenIdleClosure(),
    116       TimeDelta::FromMilliseconds(100));
    117   MessageLoop::current()->Run();
    118   ASSERT_TRUE(PathExists(writer.path()));
    119   EXPECT_EQ("baz", GetFileContent(writer.path()));
    120 }
    121 
    122 }  // namespace base
    123