Write out CacheStorageCache size to index file.

content/browser/cache_storage/cache_storage_index.cc

Index: content/browser/cache_storage/cache_storage_index.cc
diff --git a/content/browser/cache_storage/cache_storage_index.cc b/content/browser/cache_storage/cache_storage_index.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a5ddcb33692b53b986a8859949b64c4e3ce19730
--- /dev/null
+++ b/content/browser/cache_storage/cache_storage_index.cc
@@ -0,0 +1,114 @@
+// Copyright 2016 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 "content/browser/cache_storage/cache_storage_index.h"
+
+#include <utility>
+
+namespace content {
+
+CacheStorageIndex::CacheStorageIndex()
+    : doomed_cache_metadata_("", CacheStorage::kSizeUnknown) {
+  ClearDoomedCache();
+}
+
+CacheStorageIndex::~CacheStorageIndex() = default;
+
+CacheStorageIndex& CacheStorageIndex::operator=(CacheStorageIndex&& rhs) {
+  DCHECK(!has_doomed_cache_);
+  ordered_cache_metadata_ = std::move(rhs.ordered_cache_metadata_);
+  cache_metadata_map_ = std::move(rhs.cache_metadata_map_);
+  storage_size_ = rhs.storage_size_;
+  rhs.storage_size_ = CacheStorage::kSizeUnknown;
+  return *this;
+}
+
+void CacheStorageIndex::Insert(const CacheMetadata& cache_metadata) {
+  DCHECK(!has_doomed_cache_);
+  DCHECK(cache_metadata_map_.find(cache_metadata.name) ==
+         cache_metadata_map_.end());
+  ordered_cache_metadata_.push_back(cache_metadata);
+  cache_metadata_map_[cache_metadata.name] = --ordered_cache_metadata_.end();
+  storage_size_ = CacheStorage::kSizeUnknown;
+}
+
+void CacheStorageIndex::Delete(const std::string& cache_name) {
+  DCHECK(!has_doomed_cache_);
+  auto it = cache_metadata_map_.find(cache_name);
+  DCHECK(it != cache_metadata_map_.end());
+  ordered_cache_metadata_.erase(it->second);
+  cache_metadata_map_.erase(it);
+  storage_size_ = CacheStorage::kSizeUnknown;
+}
+
+bool CacheStorageIndex::SetCacheSize(const std::string& cache_name,
+                                     int64_t size) {
+  if (has_doomed_cache_)
+    DCHECK_NE(cache_name, doomed_cache_metadata_.name);
+  auto it = cache_metadata_map_.find(cache_name);
+  DCHECK(it != cache_metadata_map_.end());
+  if (it->second->size == size)
+    return false;
+  it->second->size = size;
+  storage_size_ = CacheStorage::kSizeUnknown;
+  return true;
+}
+
+int64_t CacheStorageIndex::GetCacheSize(const std::string& cache_name) const {
+  const auto& it = cache_metadata_map_.find(cache_name);
+  if (it == cache_metadata_map_.end())
+    return CacheStorage::kSizeUnknown;
+  return it->second->size;
+}
+
+int64_t CacheStorageIndex::GetStorageSize() {
+  if (storage_size_ == CacheStorage::kSizeUnknown)
+    UpdateStorageSize();
+  return storage_size_;
+}
+
+void CacheStorageIndex::UpdateStorageSize() {
+  int64_t storage_size = 0;
+  storage_size_ = CacheStorage::kSizeUnknown;
+  for (const CacheMetadata& info : ordered_cache_metadata_) {
+    if (info.size == CacheStorage::kSizeUnknown)
+      return;
+    storage_size += info.size;
+  }
+  storage_size_ = storage_size;
+}
+
+void CacheStorageIndex::DoomCache(const std::string& cache_name) {
+  DCHECK(!has_doomed_cache_);
+  auto map_it = cache_metadata_map_.find(cache_name);
+  DCHECK(map_it != cache_metadata_map_.end());
+  doomed_cache_metadata_ = std::move(*(map_it->second));
+  after_doomed_cache_metadata_ = ordered_cache_metadata_.erase(map_it->second);
+  cache_metadata_map_.erase(map_it);
+  storage_size_ = CacheStorage::kSizeUnknown;
+  has_doomed_cache_ = true;
+}
+
+void CacheStorageIndex::FinalizeDoomedCache() {
+  DCHECK(has_doomed_cache_);
+  ClearDoomedCache();
+}
+
+void CacheStorageIndex::RestoreDoomedCache() {
+  DCHECK(has_doomed_cache_);
+  const auto cache_name = doomed_cache_metadata_.name;
+  cache_metadata_map_[cache_name] = ordered_cache_metadata_.insert(
+      after_doomed_cache_metadata_, std::move(doomed_cache_metadata_));
+  after_doomed_cache_metadata_ = ordered_cache_metadata_.end();
+  storage_size_ = CacheStorage::kSizeUnknown;
+  ClearDoomedCache();
+}
+
+void CacheStorageIndex::ClearDoomedCache() {
+  doomed_cache_metadata_.name.clear();
+  after_doomed_cache_metadata_ = ordered_cache_metadata_.end();
+  has_doomed_cache_ = false;
+}
+
+}  // namespace content