1 files changed, 99 insertions, 0 deletions
diff --git a/dom/storage/SessionStorageCache.h b/dom/storage/SessionStorageCache.h
new file mode 100644
index 0000000000..6e5a57d3da
--- /dev/null
+++ b/dom/storage/SessionStorageCache.h
@@ -0,0 +1,99 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_SessionStorageCache_h
+#define mozilla_dom_SessionStorageCache_h
+
+#include "mozilla/UniquePtr.h"
+#include "mozilla/dom/LSWriteOptimizerImpl.h"
+#include "nsTHashMap.h"
+
+namespace mozilla::dom {
+
+class SSSetItemInfo;
+class SSWriteInfo;
+class SessionStorageCacheChild;
+
+/**
+ * Coalescing manipulation queue used by `SessionStorageCache`.  Used by
+ * `SessionStorageCache` to buffer and coalesce manipulations before they
+ * are sent to the parent process.
+ */
+class SSWriteOptimizer final : public LSWriteOptimizer<nsAString, nsString> {
+ public:
+  void Enumerate(nsTArray<SSWriteInfo>& aWriteInfos);
+};
+
+class SessionStorageCache final {
+ public:
+  NS_INLINE_DECL_REFCOUNTING(SessionStorageCache)
+
+  SessionStorageCache();
+
+  int64_t GetOriginQuotaUsage();
+
+  uint32_t Length();
+
+  void Key(uint32_t aIndex, nsAString& aResult);
+
+  void GetItem(const nsAString& aKey, nsAString& aResult);
+
+  void GetKeys(nsTArray<nsString>& aKeys);
+
+  nsresult SetItem(const nsAString& aKey, const nsAString& aValue,
+                   nsString& aOldValue, bool aRecordWriteInfo = true);
+
+  nsresult RemoveItem(const nsAString& aKey, nsString& aOldValue,
+                      bool aRecordWriteInfo = true);
+
+  void Clear(bool aByUserInteraction = true, bool aRecordWriteInfo = true);
+
+  void ResetWriteInfos();
+
+  already_AddRefed<SessionStorageCache> Clone() const;
+
+  nsTArray<SSSetItemInfo> SerializeData();
+
+  nsTArray<SSWriteInfo> SerializeWriteInfos();
+
+  void DeserializeData(const nsTArray<SSSetItemInfo>& aData);
+
+  void DeserializeWriteInfos(const nsTArray<SSWriteInfo>& aInfos);
+
+  void SetActor(SessionStorageCacheChild* aActor);
+
+  SessionStorageCacheChild* Actor() const { return mActor; }
+
+  void ClearActor();
+
+  void SetLoadedOrCloned() { mLoadedOrCloned = true; }
+
+  bool WasLoadedOrCloned() const { return mLoadedOrCloned; }
+
+ private:
+  ~SessionStorageCache();
+
+  struct DataSet {
+    DataSet() : mOriginQuotaUsage(0) {}
+
+    bool ProcessUsageDelta(int64_t aDelta);
+
+    nsTHashMap<nsStringHashKey, nsString> mKeys;
+
+    SSWriteOptimizer mWriteOptimizer;
+
+    int64_t mOriginQuotaUsage;
+  };
+
+  DataSet mDataSet;
+
+  SessionStorageCacheChild* mActor;
+  bool mLoadedOrCloned;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_SessionStorageCache_h