Support optimistic Create and Write operations on the SimpleCache.

net/disk_cache/backend_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/basictypes.h"
 #include "base/file_util.h"
 #include "base/port.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
@@ skipping 2881 matching lines @@
   InitCache();
 
   const char* key = "the first key";
   disk_cache::Entry* entry = NULL;
 
   ASSERT_EQ(net::OK, CreateEntry(key, &entry));
   ASSERT_TRUE(entry != NULL);
   entry->Close();
   entry = NULL;
 
+  // To make sure the file creation completed we need to call open again so that
+  // we block until it actually created the files.
+  ASSERT_EQ(net::OK, OpenEntry(key, &entry));
+  ASSERT_TRUE(entry != NULL);
+  entry->Close();
+  entry = NULL;
+
   // Delete one of the files in the entry.
   base::FilePath to_delete_file = cache_path_.AppendASCII(
       disk_cache::simple_util::GetFilenameFromKeyAndIndex(key, 0));
   EXPECT_TRUE(file_util::PathExists(to_delete_file));
   EXPECT_TRUE(disk_cache::DeleteCacheFile(to_delete_file));
 
   // Failing to open the entry should delete the rest of these files.
   ASSERT_EQ(net::ERR_FAILED, OpenEntry(key, &entry));
 
   // Confirm the rest of the files are gone.
@@ skipping 11 matching lines @@
 
   const char* key = "the first key";
   disk_cache::Entry* entry = NULL;
 
   ASSERT_EQ(net::OK, CreateEntry(key, &entry));
   disk_cache::Entry* null = NULL;
   ASSERT_NE(null, entry);
   entry->Close();
   entry = NULL;
 
+  // To make sure the file creation completed we need to call open again so that
+  // we block until it actually created the files.
+  ASSERT_EQ(net::OK, OpenEntry(key, &entry));
+  ASSERT_NE(null, entry);
+  entry->Close();
+  entry = NULL;
+
   // Write an invalid header on stream 1.
   base::FilePath entry_file1_path = cache_path_.AppendASCII(
       disk_cache::simple_util::GetFilenameFromKeyAndIndex(key, 1));
 
   disk_cache::SimpleFileHeader header;
   header.initial_magic_number = GG_UINT64_C(0xbadf00d);
   EXPECT_EQ(
       implicit_cast<int>(sizeof(header)),
       file_util::WriteFile(entry_file1_path, reinterpret_cast<char*>(&header),
                            sizeof(header)));
@@ skipping 56 matching lines @@
                                   NULL);
   cache->SetUnitTestMode();
   net::TestCompletionCallback cb;
   int rv = cache->Init(cb.callback());
   EXPECT_NE(net::OK, cb.GetResult(rv));
   delete cache;
   DisableIntegrityCheck();
 }
 
 #endif  // !defined(OS_WIN)