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      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_
     70