Cache Backend Proxy to intercept all cache events from the IO thread.

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/string_util.h"
 #include "base/stringprintf.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread_restrictions.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/base/test_completion_callback.h"
 #include "net/disk_cache/backend_impl.h"
 #include "net/disk_cache/cache_util.h"
 #include "net/disk_cache/disk_cache_test_base.h"
 #include "net/disk_cache/disk_cache_test_util.h"
 #include "net/disk_cache/entry_impl.h"
 #include "net/disk_cache/histogram_macros.h"
 #include "net/disk_cache/mapped_file.h"
 #include "net/disk_cache/mem_backend_impl.h"
+#include "net/disk_cache/tracing_cache_backend.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_handle.h"
 #endif
 
 using base::Time;
 
 // Tests that can run with different types of caches.
 class DiskCacheBackendTest : public DiskCacheTestWithCache {
@@ skipping 31 matching lines @@
   void BackendInvalidEntry11(bool eviction);
   void BackendTrimInvalidEntry12();
   void BackendDoomAll();
   void BackendDoomAll2();
   void BackendInvalidRankings();
   void BackendInvalidRankings2();
   void BackendDisable();
   void BackendDisable2();
   void BackendDisable3();
   void BackendDisable4();
+  void TracingBackendBasics();
 };
 
 void DiskCacheBackendTest::BackendBasics() {
   InitCache();
   disk_cache::Entry *entry1 = NULL, *entry2 = NULL;
   EXPECT_NE(net::OK, OpenEntry("the first key", &entry1));
   ASSERT_EQ(net::OK, CreateEntry("the first key", &entry1));
   ASSERT_TRUE(NULL != entry1);
   entry1->Close();
   entry1 = NULL;
@@ skipping 2572 matching lines @@
   // Ping the oldest entry.
   cache_->OnExternalCacheHit("key0");
 
   TrimForTest(false);
 
   // Make sure the older key remains.
   EXPECT_EQ(1, cache_->GetEntryCount());
   ASSERT_EQ(net::OK, OpenEntry("key0", &entry));
   entry->Close();
 }
+
+void DiskCacheBackendTest::TracingBackendBasics() {
+  InitCache();
+  cache_ = new disk_cache::TracingCacheBackend(cache_);
+  cache_impl_ = NULL;
+  EXPECT_EQ(net::DISK_CACHE, cache_->GetCacheType());
+  if (!simple_cache_mode_) {
+    EXPECT_EQ(0, cache_->GetEntryCount());
+  }
+
+  net::TestCompletionCallback cb;
+  disk_cache::Entry* entry = NULL;
+  EXPECT_NE(net::OK, OpenEntry("key", &entry));
+  EXPECT_TRUE(NULL == entry);
+
+  ASSERT_EQ(net::OK, CreateEntry("key", &entry));
+  EXPECT_TRUE(NULL != entry);
+
+  disk_cache::Entry* same_entry = NULL;
+  ASSERT_EQ(net::OK, OpenEntry("key", &same_entry));
+  EXPECT_TRUE(NULL != same_entry);
+
+  if (!simple_cache_mode_) {
+    EXPECT_EQ(1, cache_->GetEntryCount());
+  }
+  entry->Close();
+  entry = NULL;
+  same_entry->Close();
+  same_entry = NULL;
+}
+
+TEST_F(DiskCacheBackendTest, TracingBackendBasicsWithBackendImpl) {
+  TracingBackendBasics();
+}
+
+// File renaming is flaky on Windows, disable all Simple Backend Tests there.
+#ifdef OS_WIN
+#define TEST_SIMPLECACHE_F(c, t) TEST_F(c, DISABLED_##t)
+#else
+#define TEST_SIMPLECACHE_F(c, t) TEST_F(c, t)
+#endif
+
+TEST_SIMPLECACHE_F(DiskCacheBackendTest,
+                   TracingBackendBasicsWithSimpleBackend) {
+  SetSimpleCacheMode();
+  TracingBackendBasics();
+  // TODO(pasko): implement integrity checking on the Simple Backend.
+  DisableIntegrityCheck();
+}