New blobstoragecontext for use in the main browser process, not plugged in yet.

webkit/blob/blob_storage_host.h

+// 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_BLOB_BLOB_STORAGE_HOST_H_
+#define WEBKIT_BLOB_BLOB_STORAGE_HOST_H_
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
+#include "webkit/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_BLOB_BLOB_STORAGE_HOST_H_