78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_RemoteLazyInputStreamStorage_h
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#define mozilla_RemoteLazyInputStreamStorage_h
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#include "mozilla/RefPtr.h"
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#include "nsClassHashtable.h"
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#include "nsIObserver.h"
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class nsIInputStream;
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struct nsID;
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namespace mozilla {
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class NS_NO_VTABLE RemoteLazyInputStreamParentCallback {
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public:
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virtual void ActorDestroyed(const nsID& aID) = 0;
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NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
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protected:
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virtual ~RemoteLazyInputStreamParentCallback() = default;
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};
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class RemoteLazyInputStreamStorage final : public nsIObserver {
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIOBSERVER
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// This initializes the singleton and it must be called on the main-thread.
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static void Initialize();
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static Result<RefPtr<RemoteLazyInputStreamStorage>, nsresult> Get();
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nsISerialEventTarget* TaskQueue() { return mTaskQueue; }
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void AddStream(nsIInputStream* aInputStream, const nsID& aID);
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// Removes and returns the stream corresponding to the nsID. May return a
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// nullptr if there's no stream stored for the nsID.
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nsCOMPtr<nsIInputStream> ForgetStream(const nsID& aID);
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bool HasStream(const nsID& aID);
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void GetStream(const nsID& aID, uint64_t aStart, uint64_t aLength,
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nsIInputStream** aInputStream);
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void StoreCallback(const nsID& aID,
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RemoteLazyInputStreamParentCallback* aCallback);
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already_AddRefed<RemoteLazyInputStreamParentCallback> TakeCallback(
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const nsID& aID);
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void ActorCreated(const nsID& aID);
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void ActorDestroyed(const nsID& aID);
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private:
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RemoteLazyInputStreamStorage() = default;
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~RemoteLazyInputStreamStorage() = default;
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nsCOMPtr<nsISerialEventTarget> mTaskQueue;
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struct StreamData {
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nsCOMPtr<nsIInputStream> mInputStream;
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RefPtr<RemoteLazyInputStreamParentCallback> mCallback;
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size_t mActorCount = 0;
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};
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nsClassHashtable<nsIDHashKey, StreamData> mStorage;
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};
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} // namespace mozilla
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#endif // mozilla_RemoteLazyInputStreamStorage_h
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