Source code

Revision control

Copy as Markdown

Other Tools

/* -*- 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 */
#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 {
virtual void ActorDestroyed(const nsID& aID) = 0;
virtual ~RemoteLazyInputStreamParentCallback() = default;
class RemoteLazyInputStreamStorage final : public 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);
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