webkit/browser/blob/blob_storage_host.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef WEBKIT_BROWSER_BLOB_BLOB_STORAGE_HOST_H_
   6 #define WEBKIT_BROWSER_BLOB_BLOB_STORAGE_HOST_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <string>
  11
  12 #include "base/compiler_specific.h"
  13 #include "base/memory/weak_ptr.h"
  14 #include "webkit/browser/webkit_storage_browser_export.h"
  15 #include "webkit/common/blob/blob_data.h"
  16
  17 class GURL;
  18
  19 namespace webkit_blob {
  20
  21 class BlobDataHandle;
  22 class BlobStorageHost;
  23 class BlobStorageContext;
  24
  25 // This class handles the logistics of blob storage for a single child process.
  26 // There is one instance per child process. When the child process
  27 // terminates all blob references attibutable to that process go away upon
  28 // destruction of the instance. The class is single threaded and should
  29 // only be used on the IO thread.
  30 class WEBKIT_STORAGE_BROWSER_EXPORT BlobStorageHost {
  31  public:
  32   explicit BlobStorageHost(BlobStorageContext* context);
  33   ~BlobStorageHost();
  34
  35   // Methods to support the IPC message protocol.
  36   // A false return indicates a problem with the inputs
  37   // like a non-existent or pre-existent uuid or url.
  38   bool StartBuildingBlob(const std::string& uuid) WARN_UNUSED_RESULT;
  39   bool AppendBlobDataItem(const std::string& uuid,
  40                           const BlobData::Item& data_item) WARN_UNUSED_RESULT;
  41   bool CancelBuildingBlob(const std::string& uuid) WARN_UNUSED_RESULT;
  42   bool FinishBuildingBlob(const std::string& uuid,
  43                           const std::string& type) WARN_UNUSED_RESULT;
  44   bool IncrementBlobRefCount(const std::string& uuid) WARN_UNUSED_RESULT;
  45   bool DecrementBlobRefCount(const std::string& uuid) WARN_UNUSED_RESULT;
  46   bool RegisterPublicBlobURL(const GURL& blob_url,
  47                              const std::string& uuid) WARN_UNUSED_RESULT;
  48   bool RevokePublicBlobURL(const GURL& blob_url) WARN_UNUSED_RESULT;
  49
  50  private:
  51   typedef std::map<std::string, int> BlobReferenceMap;
  52
  53   bool IsInUseInHost(const std::string& uuid);
  54   bool IsBeingBuiltInHost(const std::string& uuid);
  55   bool IsUrlRegisteredInHost(const GURL& blob_url);
  56
  57   // Collection of blob ids and a count of how many usages
  58   // of that id are attributable to this consumer.
  59   BlobReferenceMap blobs_inuse_map_;
  60
  61   // The set of public blob urls coined by this consumer.
  62   std::set<GURL> public_blob_urls_;
  63
  64   base::WeakPtr<BlobStorageContext> context_;
  65 };
  66
  67 }  // namespace webkit_blob
  68
  69 #endif  // WEBKIT_BROWSER_BLOB_BLOB_STORAGE_HOST_H_