| 1 | | | import 'dart:async'; |
| 2 | | | |
| 3 | | | import 'package:logger/web.dart'; |
| 4 | | | import 'package:meta/meta.dart'; |
| 5 | | | |
| 6 | | | import '_impl/xplat/_channel.dart' |
| 7 | | | if (dart.library.io) '_impl/native/_channel.dart' |
| 8 | | | if (dart.library.html) '_impl/web/_channel.dart' |
| 9 | | | if (dart.library.js) '_impl/web/_channel.dart' |
| 10 | | | if (dart.library.js_interop) '_impl/web/_channel.dart' as impl; |
| 11 | | | import 'exceptions/exception_manager.dart'; |
| 12 | | | import 'exceptions/task_terminated_exception.dart'; |
| 13 | | | import 'tokens/_squadron_cancelation_token.dart'; |
| 14 | | | import 'typedefs.dart'; |
| 15 | | | import 'worker/worker_message.dart'; |
| 16 | | | import 'worker/worker_request.dart'; |
| 17 | | | import 'worker/worker_response.dart'; |
| 18 | | | |
| 19 | | | /// A [Channel] supports communication from a client to a platform worker. It |
| 20 | | | /// is used to send a [WorkerRequest] to a platform worker. |
| 21 | | | abstract interface class Channel { |
| 22 | | | /// The [ExceptionManager] attached to this channel. |
| 23 | | | ExceptionManager get exceptionManager; |
| 24 | | | |
| 25 | | | /// The [Logger] attached to this channel. |
| 26 | | | Logger? get logger; |
| 27 | | | |
| 28 | | | /// [Channel] serialization. Returns an opaque object that can be transfered |
| 29 | | | /// from the client to the worker. |
| 30 | | | PlatformChannel serialize(); |
| 31 | | | |
| 32 | | | /// [Channel] sharing. Returns a [Channel] object that can be provided to |
| 33 | | | /// enable another worker to call the channel's worker. |
| 34 | | | Channel share(); |
| 35 | | | |
| 36 | | | /// Returns a [Future] that will complete when the channel is closed. This is |
| 37 | | | /// the same [Future] as the one returned by [close]. |
| 38 | | | Future<void> get closed; |
| 39 | | | |
| 40 | | | /// Sends a termination [WorkerRequest] to the worker. The [Channel] should |
| 41 | | | /// release any resource related to the worker and should not be used after |
| 42 | | | /// this method has been called. |
| 43 | | | Future<void> close(); |
| 44 | | | |
| 45 | | | /// Sends a close stream [WorkerRequest] to the worker. |
| 46 | | | void cancelStream(StreamId streamId); |
| 47 | | | |
| 48 | | | /// Sends a cancel token [WorkerRequest] to the worker. |
| 49 | | | void cancelToken(SquadronCancelationToken? token); |
| 50 | | | |
| 51 | | | /// Creates a [WorkerRequest] and sends it to the worker. This method expects |
| 52 | | | /// a single value from the worker. |
| 53 | | | Future<dynamic> sendRequest(int command, List args, |
| 54 | | | {SquadronCancelationToken? token, |
| 55 | | | bool inspectRequest = false, |
| 56 | | | bool inspectResponse = false}); |
| 57 | | | |
| 58 | | | /// Creates a [WorkerRequest] and sends it to the worker. This method expects |
| 59 | | | /// a stream of values from the worker. The worker must send a |
| 60 | | | /// [WorkerResponse.closeStream] message to close the [Stream]. |
| 61 | | | Stream<dynamic> sendStreamingRequest(int command, List args, |
| 62 | | | {SquadronCancelationToken? token, |
| 63 | | | bool inspectRequest = false, |
| 64 | | | bool inspectResponse = false}); |
| 65 | | | |
| 66 | | | /// Starts a worker using the [entryPoint] and sends a start [WorkerRequest] |
| 67 | | | /// with [startArguments]. The future must not complete before the worker is |
| 68 | | | /// ready to serve requests. |
| 69 | | 11 | static Future<Channel> open( |
| 70 | | | ExceptionManager exceptionManager, |
| 71 | | | Logger? logger, |
| 72 | | | EntryPoint entryPoint, |
| 73 | | | List startArguments, |
| 74 | | | PlatformThreadHook? hook, |
| 75 | | | ) => |
| 76 | | 11 | impl.openChannel( |
| 77 | | | entryPoint, exceptionManager, logger, startArguments, hook); |
| 78 | | | |
| 79 | | | /// Deserializes a [Channel] from an opaque [channelInfo]. |
| 80 | | 3 | static Channel? deserialize( |
| 81 | | | PlatformChannel? channelInfo, [ |
| 82 | | | Logger? logger, |
| 83 | | | ExceptionManager? exceptionManager, |
| 84 | | | ]) => |
| 85 | | 3 | impl.deserialize(channelInfo, logger, exceptionManager); |
| 86 | | | } |
| 87 | | | |
| 88 | | | @internal |
| 89 | | | extension ChannelImpl on Channel { |
| 90 | | 4 | void terminate(TaskTerminatedException ex) => impl.terminateChannel(this, ex); |
| 91 | | | |
| 92 | | 12 | int getActiveConnections() => impl.getActiveConnections(this); |
| 93 | | | } |