1 files changed, 106 insertions, 0 deletions
diff --git a/dom/file/ipc/RemoteLazyInputStreamChild.h b/dom/file/ipc/RemoteLazyInputStreamChild.h
new file mode 100644
index 0000000000..7e86a90ac8
--- /dev/null
+++ b/dom/file/ipc/RemoteLazyInputStreamChild.h
@@ -0,0 +1,106 @@
+/* -*- 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_RemoteLazyInputStreamChild_h
+#define mozilla_RemoteLazyInputStreamChild_h
+
+#include "mozilla/PRemoteLazyInputStreamChild.h"
+#include "mozilla/RemoteLazyInputStream.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/UniquePtr.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+
+class RemoteLazyInputStream;
+
+namespace dom {
+class ThreadSafeWorkerRef;
+}
+
+class RemoteLazyInputStreamChild final : public PRemoteLazyInputStreamChild {
+ public:
+  enum ActorState {
+    // The actor is connected via IPDL to the parent.
+    eActive,
+
+    // The actor is disconnected.
+    eInactive,
+
+    // The actor is waiting to be disconnected. Once it has been disconnected,
+    // it will be reactivated on the DOM-File thread.
+    eActiveMigrating,
+
+    // The actor has been disconnected and it's waiting to be connected on the
+    // DOM-File thread.
+    eInactiveMigrating,
+  };
+
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(RemoteLazyInputStreamChild, final)
+
+  RemoteLazyInputStreamChild(const nsID& aID, uint64_t aSize);
+
+  void ActorDestroy(IProtocol::ActorDestroyReason aReason) override;
+
+  ActorState State();
+
+  already_AddRefed<RemoteLazyInputStream> CreateStream();
+
+  void ForgetStream(RemoteLazyInputStream* aStream);
+
+  const nsID& ID() const { return mID; }
+
+  uint64_t Size() const { return mSize; }
+
+  void StreamNeeded(RemoteLazyInputStream* aStream,
+                    nsIEventTarget* aEventTarget);
+
+  mozilla::ipc::IPCResult RecvStreamReady(const Maybe<IPCStream>& aStream);
+
+  void LengthNeeded(RemoteLazyInputStream* aStream,
+                    nsIEventTarget* aEventTarget);
+
+  mozilla::ipc::IPCResult RecvLengthReady(const int64_t& aLength);
+
+  void Shutdown();
+
+  void Migrated();
+
+ private:
+  ~RemoteLazyInputStreamChild();
+
+  // Raw pointers because these streams keep this actor alive. When the last
+  // stream is unregister, the actor will be deleted. This list is protected by
+  // mutex.
+  nsTArray<RemoteLazyInputStream*> mStreams;
+
+  // This mutex protects mStreams because that can be touched in any thread.
+  Mutex mMutex;
+
+  const nsID mID;
+  const uint64_t mSize;
+
+  ActorState mState;
+
+  // This struct and the array are used for creating streams when needed.
+  struct PendingOperation {
+    RefPtr<RemoteLazyInputStream> mStream;
+    nsCOMPtr<nsIEventTarget> mEventTarget;
+    enum {
+      eStreamNeeded,
+      eLengthNeeded,
+    } mOp;
+  };
+  nsTArray<PendingOperation> mPendingOperations;
+
+  nsCOMPtr<nsISerialEventTarget> mOwningEventTarget;
+
+  RefPtr<dom::ThreadSafeWorkerRef> mWorkerRef;
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_RemoteLazyInputStreamChild_h