[BlobAsync] Asynchronous Blob Construction Final Patch

storage/browser/blob/blob_storage_registry.h

 // 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.
 
 #ifndef STORAGE_BROWSER_BLOB_BLOB_STORAGE_REGISTRY_H_
 #define STORAGE_BROWSER_BLOB_BLOB_STORAGE_REGISTRY_H_
 
 #include <stddef.h>
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
 #include "storage/browser/blob/internal_blob_data.h"
 #include "storage/browser/storage_browser_export.h"
+#include "storage/common/blob_storage/blob_storage_constants.h"
 
 class GURL;
 
 namespace storage {
 
 // This class stores the blob data in the various states of construction, as
 // well as URL mappings to blob uuids.
 // Implementation notes:
 // * There is no implicit refcounting in this class, except for setting the
 //   refcount to 1 on registration.
 // * When removing a uuid registration, we do not check for URL mappings to that
 //   uuid. The user must keep track of these.
 class STORAGE_EXPORT BlobStorageRegistry {
  public:
   enum class BlobState {
-    // First the renderer reserves the uuid.
-    RESERVED = 1,
-    // Second, we are asynchronously transporting data to the browser.
-    ASYNC_TRANSPORTATION,
-    // Third, we construct the blob when we have all of the data.
-    CONSTRUCTION,
-    // Finally, the blob is built.
-    ACTIVE
+    // The blob is pending transportation from the renderer.
+    PENDING,
+    // The blob is complete and can be read from.
+    COMPLETE,
+    // The blob is broken and no longer holds data. This happens when there was
+    // a problem constructing the blob, or we've run out of memory.
+    BROKEN
   };
 
   struct STORAGE_EXPORT Entry {
     size_t refcount;
     BlobState state;
-    std::vector<base::Callback<void(bool)>> construction_complete_callbacks;
+    std::vector<base::Callback<void(bool)>> build_completion_callbacks;
 
-    // Flags
-    bool exceeded_memory;
+    // Only applicable if the state == BROKEN.
+    IPCBlobCreationCancelCode broken_reason =
+        IPCBlobCreationCancelCode::UNKNOWN;
 
     // data and data_builder are mutually exclusive.
     scoped_ptr<InternalBlobData> data;
     scoped_ptr<InternalBlobData::Builder> data_builder;
 
+    std::string content_type;
+    std::string content_disposition;
+
     Entry() = delete;
     Entry(int refcount, BlobState state);
     ~Entry();
 
     // Performs a test-and-set on the state of the given blob. If the state
     // isn't as expected, we return false. Otherwise we set the new state and
     // return true.
     bool TestAndSetState(BlobState expected, BlobState set);
   };
 
   BlobStorageRegistry();
   ~BlobStorageRegistry();
 
   // Creates the blob entry with a refcount of 1 and a state of RESERVED. If
   // the blob is already in use, we return null.
   Entry* CreateEntry(const std::string& uuid);
 
   // Removes the blob entry with the given uuid. This does not unmap any
   // URLs that are pointing to this uuid. Returns if the entry existed.
   bool DeleteEntry(const std::string& uuid);
 
+  bool HasEntry(const std::string& uuid) const;
+
   // Gets the blob entry for the given uuid. Returns nullptr if the entry
   // does not exist.
   Entry* GetEntry(const std::string& uuid);
+  const Entry* GetEntry(const std::string& uuid) const;
 
   // Creates a url mapping from blob uuid to the given url. Returns false if
   // the uuid isn't mapped to an entry or if there already is a map for the URL.
   bool CreateUrlMapping(const GURL& url, const std::string& uuid);
 
   // Removes the given URL mapping. Optionally populates a uuid string of the
   // removed entry uuid. Returns false if the url isn't mapped.
   bool DeleteURLMapping(const GURL& url, std::string* uuid);
 
   // Returns if the url is mapped to a blob uuid.
   bool IsURLMapped(const GURL& blob_url) const;
 
   // Returns the entry from the given url, and optionally populates the uuid for
   // that entry. Returns a nullptr if the mapping or entry doesn't exist.
   Entry* GetEntryFromURL(const GURL& url, std::string* uuid);
 
   size_t blob_count() const { return blob_map_.size(); }
   size_t url_count() const { return url_to_uuid_.size(); }
 
  private:
+  friend class ViewBlobInternalsJob;
   using BlobMap = base::ScopedPtrHashMap<std::string, scoped_ptr<Entry>>;
   using URLMap = std::map<GURL, std::string>;
 
   BlobMap blob_map_;
   URLMap url_to_uuid_;
 
   DISALLOW_COPY_AND_ASSIGN(BlobStorageRegistry);
 };
 
 }  // namespace storage
 #endif  // STORAGE_BROWSER_BLOB_BLOB_STORAGE_REGISTRY_H_