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 EXTENSIONS_BROWSER_BLOB_HOLDER_H_ 6 #define EXTENSIONS_BROWSER_BLOB_HOLDER_H_ 7 8 #include <map> 9 #include <string> 10 #include <vector> 11 12 #include "base/memory/linked_ptr.h" 13 #include "base/memory/scoped_ptr.h" 14 #include "base/supports_user_data.h" 15 16 namespace content { 17 class BlobHandle; 18 class RenderProcessHost; 19 } 20 21 namespace extensions { 22 23 class ExtensionMessageFilter; 24 25 // Used for holding onto Blobs created into the browser process until a 26 // renderer takes over ownership. This class operates on the UI thread. 27 class BlobHolder : public base::SupportsUserData::Data { 28 public: 29 // Will create the BlobHolder if it doesn't already exist. 30 static BlobHolder* FromRenderProcessHost( 31 content::RenderProcessHost* render_process_host); 32 33 virtual ~BlobHolder(); 34 35 // Causes BlobHolder to take ownership of |blob|. 36 void HoldBlobReference(scoped_ptr<content::BlobHandle> blob); 37 38 private: 39 typedef std::multimap<std::string, linked_ptr<content::BlobHandle> > 40 BlobHandleMultimap; 41 42 explicit BlobHolder(content::RenderProcessHost* render_process_host); 43 44 // BlobHolder will drop a blob handle for each element in blob_uuids. 45 // If caller wishes to drop multiple references to the same blob, 46 // |blob_uuids| may contain duplicate UUIDs. 47 void DropBlobs(const std::vector<std::string>& blob_uuids); 48 friend class ExtensionMessageFilter; 49 50 bool ContainsBlobHandle(content::BlobHandle* handle) const; 51 52 // A reference to the owner of this class. 53 content::RenderProcessHost* render_process_host_; 54 55 BlobHandleMultimap held_blobs_; 56 57 DISALLOW_COPY_AND_ASSIGN(BlobHolder); 58 }; 59 60 } // namespace extensions 61 62 #endif // EXTENSIONS_BROWSER_BLOB_HOLDER_H_ 63
