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      1 // Copyright 2014 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 CONTENT_BROWSER_FILEAPI_STORAGE_HOST_H_
      6 #define CONTENT_BROWSER_FILEAPI_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 "content/common/content_export.h"
     15 #include "storage/common/blob/blob_data.h"
     16 
     17 class GURL;
     18 
     19 namespace storage {
     20 class BlobDataHandle;
     21 class BlobStorageHost;
     22 class BlobStorageContext;
     23 }
     24 
     25 using storage::BlobStorageContext;
     26 using storage::BlobData;
     27 
     28 namespace content {
     29 
     30 // This class handles the logistics of blob storage for a single child process.
     31 // There is one instance per child process. When the child process
     32 // terminates all blob references attibutable to that process go away upon
     33 // destruction of the instance. The class is single threaded and should
     34 // only be used on the IO thread.
     35 class CONTENT_EXPORT BlobStorageHost {
     36  public:
     37   explicit BlobStorageHost(BlobStorageContext* context);
     38   ~BlobStorageHost();
     39 
     40   // Methods to support the IPC message protocol.
     41   // A false return indicates a problem with the inputs
     42   // like a non-existent or pre-existent uuid or url.
     43   bool StartBuildingBlob(const std::string& uuid) WARN_UNUSED_RESULT;
     44   bool AppendBlobDataItem(const std::string& uuid,
     45                           const BlobData::Item& data_item) WARN_UNUSED_RESULT;
     46   bool CancelBuildingBlob(const std::string& uuid) WARN_UNUSED_RESULT;
     47   bool FinishBuildingBlob(const std::string& uuid,
     48                           const std::string& type) WARN_UNUSED_RESULT;
     49   bool IncrementBlobRefCount(const std::string& uuid) WARN_UNUSED_RESULT;
     50   bool DecrementBlobRefCount(const std::string& uuid) WARN_UNUSED_RESULT;
     51   bool RegisterPublicBlobURL(const GURL& blob_url,
     52                              const std::string& uuid) WARN_UNUSED_RESULT;
     53   bool RevokePublicBlobURL(const GURL& blob_url) WARN_UNUSED_RESULT;
     54 
     55  private:
     56   typedef std::map<std::string, int> BlobReferenceMap;
     57 
     58   bool IsInUseInHost(const std::string& uuid);
     59   bool IsBeingBuiltInHost(const std::string& uuid);
     60   bool IsUrlRegisteredInHost(const GURL& blob_url);
     61 
     62   // Collection of blob ids and a count of how many usages
     63   // of that id are attributable to this consumer.
     64   BlobReferenceMap blobs_inuse_map_;
     65 
     66   // The set of public blob urls coined by this consumer.
     67   std::set<GURL> public_blob_urls_;
     68 
     69   base::WeakPtr<BlobStorageContext> context_;
     70 
     71   DISALLOW_COPY_AND_ASSIGN(BlobStorageHost);
     72 };
     73 
     74 }  // namespace content
     75 
     76 #endif  // CONTENT_BROWSER_FILEAPI_STORAGE_HOST_H_
     77