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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_BROWSER_BLOB_HOLDER_H_
#define EXTENSIONS_BROWSER_BLOB_HOLDER_H_
#include <map>
#include <string>
#include <vector>
#include "base/macros.h"
#include "base/memory/linked_ptr.h"
#include "base/memory/scoped_ptr.h"
#include "base/supports_user_data.h"
namespace content {
class BlobHandle;
class RenderProcessHost;
}
namespace extensions {
class ExtensionMessageFilter;
// Used for holding onto Blobs created into the browser process until a
// renderer takes over ownership. This class operates on the UI thread.
class BlobHolder : public base::SupportsUserData::Data {
public:
// Will create the BlobHolder if it doesn't already exist.
static BlobHolder* FromRenderProcessHost(
content::RenderProcessHost* render_process_host);
~BlobHolder() override;
// Causes BlobHolder to take ownership of |blob|.
void HoldBlobReference(scoped_ptr<content::BlobHandle> blob);
private:
typedef std::multimap<std::string, linked_ptr<content::BlobHandle> >
BlobHandleMultimap;
explicit BlobHolder(content::RenderProcessHost* render_process_host);
// BlobHolder will drop a blob handle for each element in blob_uuids.
// If caller wishes to drop multiple references to the same blob,
// |blob_uuids| may contain duplicate UUIDs.
void DropBlobs(const std::vector<std::string>& blob_uuids);
friend class ExtensionMessageFilter;
bool ContainsBlobHandle(content::BlobHandle* handle) const;
// A reference to the owner of this class.
content::RenderProcessHost* render_process_host_;
BlobHandleMultimap held_blobs_;
DISALLOW_COPY_AND_ASSIGN(BlobHolder);
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_BLOB_HOLDER_H_
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