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 DISALLOW_COPY_AND_ASSIGN(BlobStorageHost); 67 }; 68 69 } // namespace webkit_blob 70 71 #endif // WEBKIT_BROWSER_BLOB_BLOB_STORAGE_HOST_H_ 72