[BlobAsync] Disk support for blob storage

storage/browser/blob/internal_blob_data.cc

 // Copyright 2015 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 "storage/browser/blob/internal_blob_data.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/containers/hash_tables.h"
 #include "base/metrics/histogram.h"
 #include "storage/browser/blob/blob_data_item.h"
+#include "storage/browser/blob/shareable_blob_data_item.h"
 #include "storage/common/data_element.h"
 
 namespace storage {
+namespace {
+bool IsBytes(DataElement::Type type) {
+  return type == DataElement::TYPE_BYTES ||
+         type == DataElement::TYPE_BYTES_DESCRIPTION;
+}
+}  // namespace
 
-InternalBlobData::Builder::Builder() : data_(new InternalBlobData()) {
-}
-InternalBlobData::Builder::~Builder() {
-}
+InternalBlobData::InternalBlobData() {}
 
-void InternalBlobData::Builder::AppendSharedBlobItem(
+InternalBlobData::~InternalBlobData() {}
+
+void InternalBlobData::AppendSharedBlobItem(
+    const std::string& my_uuid,
     scoped_refptr<ShareableBlobDataItem> item) {
-  DCHECK(item);
-  DCHECK(data_);
-  data_->items_.push_back(item);
-}
-
-void InternalBlobData::Builder::RemoveBlobFromShareableItems(
-    const std::string& blob_uuid) {
-  DCHECK(data_);
-  data_->RemoveBlobFromShareableItems(blob_uuid);
-}
-
-size_t InternalBlobData::Builder::GetNonsharedMemoryUsage() const {
-  DCHECK(data_);
-  return data_->GetUnsharedMemoryUsage();
-}
-
-std::unique_ptr<InternalBlobData> InternalBlobData::Builder::Build() {
-  DCHECK(data_);
-  return std::move(data_);
-}
-
-InternalBlobData::InternalBlobData() {
-}
-
-InternalBlobData::~InternalBlobData() {
+  if (!items_.empty()) {
+    offsets_.push_back(size_);
+  }
+  size_ += item->item()->length();
+  item->referencing_blobs_.insert(my_uuid);
+  items_.push_back(std::move(item));
 }
 
 const std::vector<scoped_refptr<ShareableBlobDataItem>>&
 InternalBlobData::items() const {
   return items_;
 }
 
 void InternalBlobData::RemoveBlobFromShareableItems(
     const std::string& blob_uuid) {
   for (auto& data_item : items_) {
-    data_item->referencing_blobs().erase(blob_uuid);
+    data_item->referencing_blobs_.erase(blob_uuid);
   }
 }
 
 size_t InternalBlobData::GetUnsharedMemoryUsage() const {
   size_t memory = 0;
   base::hash_set<void*> seen_items;
   for (const auto& data_item : items_) {
-    if (data_item->item()->type() != DataElement::TYPE_BYTES ||
+    if (!IsBytes(data_item->item()->type()) ||
         data_item->referencing_blobs().size() > 1 ||
         seen_items.find(data_item.get()) != seen_items.end()) {
       continue;
     }
+    LOG(ERROR) << "no one else has item " << data_item->item_id();
     memory += data_item->item()->length();
     seen_items.insert(data_item.get());
   }
   return memory;
 }
 
-void InternalBlobData::GetMemoryUsage(size_t* total_memory,
-                                      size_t* unshared_memory) {
-  *total_memory = 0;
-  *unshared_memory = 0;
-  base::hash_set<void*> seen_items;
-  for (const auto& data_item : items_) {
-    if (data_item->item()->type() == DataElement::TYPE_BYTES) {
-      *total_memory += data_item->item()->length();
-      if (data_item->referencing_blobs().size() == 1 &&
-          seen_items.find(data_item.get()) == seen_items.end()) {
-        *unshared_memory += data_item->item()->length();
-        seen_items.insert(data_item.get());
-      }
-    }
-  }
-}
-
 }  // namespace storage