gecko-dev/dom/messagechannel/PMessagePort.ipdl

/* 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/. */

include protocol PBackground;
include protocol PBlob;

using struct nsID from "nsID.h";

namespace mozilla {
namespace dom {

struct MessagePortIdentifier
{
  nsID uuid;
  nsID destinationUuid;
  uint32_t sequenceId;
  bool neutered;
};

struct MessagePortMessage
{
  MessagePortIdentifier[] transferredPorts;
  uint8_t[] data;
  PBlob[] blobs;
};

// This protocol is used for the MessageChannel/MessagePort API
protocol PMessagePort
{
  manager PBackground;

  /* Many of these methods are used just for the shutdown sequence. The
     correct sequence for the child actor is:
     1. SendStopSendingData();
     2. RecvStopSendingDataConfirmed();
     3. SendClose();
     4. Recv__delete__(); */

  /* When the port is transferred the sequence is:
     1. SendStopSendingData();
     2. RecvStopSendingDataConfirmed();
     3. SendDisentangle();
     4. Recv__delete__(); */

parent:
  async PostMessages(MessagePortMessage[] messages);
  async Disentangle(MessagePortMessage[] messages);
  async StopSendingData();
  async Close();

child:
  async Entangled(MessagePortMessage[] messages);
  async ReceiveData(MessagePortMessage[] messages);
  async StopSendingDataConfirmed();

  async __delete__();
};

} // namespace dom
} // namespace mozilla