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// Copyright (c) 2013 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 WEBKIT_BROWSER_BLOB_BLOB_STORAGE_HOST_H_
#define WEBKIT_BROWSER_BLOB_BLOB_STORAGE_HOST_H_
#include <map>
#include <set>
#include <string>
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "webkit/common/blob/blob_data.h"
#include "webkit/storage/webkit_storage_export.h"
class GURL;
namespace webkit_blob {
class BlobDataHandle;
class BlobStorageHost;
class BlobStorageContext;
// This class handles the logistics of blob storage for a single child process.
// There is one instance per child process. When the child process
// terminates all blob references attibutable to that process go away upon
// destruction of the instance. The class is single threaded and should
// only be used on the IO thread.
class WEBKIT_STORAGE_EXPORT BlobStorageHost {
public:
explicit BlobStorageHost(BlobStorageContext* context);
~BlobStorageHost();
// Methods to support the IPC message protocol.
// A false return indicates a problem with the inputs
// like a non-existent or pre-existent uuid or url.
bool StartBuildingBlob(const std::string& uuid) WARN_UNUSED_RESULT;
bool AppendBlobDataItem(const std::string& uuid,
const BlobData::Item& data_item) WARN_UNUSED_RESULT;
bool CancelBuildingBlob(const std::string& uuid) WARN_UNUSED_RESULT;
bool FinishBuildingBlob(const std::string& uuid,
const std::string& type) WARN_UNUSED_RESULT;
bool IncrementBlobRefCount(const std::string& uuid) WARN_UNUSED_RESULT;
bool DecrementBlobRefCount(const std::string& uuid) WARN_UNUSED_RESULT;
bool RegisterPublicBlobURL(const GURL& blob_url,
const std::string& uuid) WARN_UNUSED_RESULT;
bool RevokePublicBlobURL(const GURL& blob_url) WARN_UNUSED_RESULT;
private:
typedef std::map<std::string, int> BlobReferenceMap;
bool IsInUseInHost(const std::string& uuid);
bool IsBeingBuiltInHost(const std::string& uuid);
bool IsUrlRegisteredInHost(const GURL& blob_url);
// Collection of blob ids and a count of how many usages
// of that id are attributable to this consumer.
BlobReferenceMap blobs_inuse_map_;
// The set of public blob urls coined by this consumer.
std::set<GURL> public_blob_urls_;
base::WeakPtr<BlobStorageContext> context_;
};
} // namespace webkit_blob
#endif // WEBKIT_BROWSER_BLOB_BLOB_STORAGE_HOST_H_
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