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 16namespace content { 17class BlobHandle; 18class RenderProcessHost; 19} 20 21namespace extensions { 22 23class 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. 27class 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