69 lines
1.7 KiB
Dart
69 lines
1.7 KiB
Dart
import 'dart:async';
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import 'dart:isolate';
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import 'dart:ui';
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import 'package:flutter/services.dart';
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/// Ein PortController mit verschiedenen FUnktionen zur KOmmunikations zwischen
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/// main und anderen Isolates
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class PortController {
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/// Gibt eine Instanz dieser Klasse zurück
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factory PortController() => _instance;
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PortController._internal() {
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if (ServicesBinding.rootIsolateToken != null) {
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_registerRootIsolateTokenSender();
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}
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}
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static final PortController _instance = PortController._internal();
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/// Fügt einen Port mit [name] zum NameServer hinzu
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void addPort(final SendPort sendPort, final String name) {
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IsolateNameServer.registerPortWithName(sendPort, name);
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}
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/// Gibt einen Port mit [name] vom NameServer zurück, falls gefunden
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SendPort? getPort(final String name) =>
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IsolateNameServer.lookupPortByName(name);
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/// Gibt das [RootIsolateToken] der main-Isolate zurück
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Future<RootIsolateToken?> getRootIsolateToken() async {
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final ReceivePort receivePort = ReceivePort();
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final SendPort? rootPort = IsolateNameServer.lookupPortByName(
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'root-isolate-token',
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);
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if (rootPort == null) {
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receivePort.close();
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return null;
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}
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rootPort.send(receivePort.sendPort);
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try {
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final dynamic message = await receivePort.first;
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if (message is RootIsolateToken) {
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return message;
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}
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return null;
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} finally {
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receivePort.close();
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}
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}
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void _registerRootIsolateTokenSender() {
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final ReceivePort receivePort = ReceivePort()
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..listen((final value) {
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if (value is SendPort) {
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value.send(ServicesBinding.rootIsolateToken);
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}
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});
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addPort(receivePort.sendPort, 'root-isolate-token');
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}
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}
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