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/* -*- 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_RemoteLazyInputStreamStorage_h
#define mozilla_RemoteLazyInputStreamStorage_h
#include "mozilla/RefPtr.h"
#include "nsClassHashtable.h"
#include "nsIObserver.h"
class nsIInputStream;
struct nsID;
namespace mozilla {
class NS_NO_VTABLE RemoteLazyInputStreamParentCallback {
public:
virtual void ActorDestroyed(const nsID& aID) = 0;
NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
protected:
virtual ~RemoteLazyInputStreamParentCallback() = default;
};
class RemoteLazyInputStreamStorage final : public nsIObserver {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIOBSERVER
// This initializes the singleton and it must be called on the main-thread.
static void Initialize();
static Result<RefPtr<RemoteLazyInputStreamStorage>, nsresult> Get();
nsISerialEventTarget* TaskQueue() { return mTaskQueue; }
void AddStream(nsIInputStream* aInputStream, const nsID& aID);
// Removes and returns the stream corresponding to the nsID. May return a
// nullptr if there's no stream stored for the nsID.
nsCOMPtr<nsIInputStream> ForgetStream(const nsID& aID);
bool HasStream(const nsID& aID);
void GetStream(const nsID& aID, uint64_t aStart, uint64_t aLength,
nsIInputStream** aInputStream);
void StoreCallback(const nsID& aID,
RemoteLazyInputStreamParentCallback* aCallback);
already_AddRefed<RemoteLazyInputStreamParentCallback> TakeCallback(
const nsID& aID);
void ActorCreated(const nsID& aID);
void ActorDestroyed(const nsID& aID);
private:
RemoteLazyInputStreamStorage() = default;
~RemoteLazyInputStreamStorage() = default;
nsCOMPtr<nsISerialEventTarget> mTaskQueue;
struct StreamData {
nsCOMPtr<nsIInputStream> mInputStream;
RefPtr<RemoteLazyInputStreamParentCallback> mCallback;
size_t mActorCount = 0;
};
nsClassHashtable<nsIDHashKey, StreamData> mStorage;
};
} // namespace mozilla
#endif // mozilla_RemoteLazyInputStreamStorage_h
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