blob: 1acd88351f3ba2cf393d12bb33e4dffcc0c5790e [file] [log] [blame]
// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:async';
class Node {
final List<Node> childs = <Node>[];
int parentsCount = 0;
// [nodeId] must be unique among nodes in one computational graph.
final String nodeId;
/// Manual Node constructor. Adds prefix 'n-' to [nodeId].
Node(String nodeId) : this._internal('n-$nodeId');
/// Constructor, doesn't modify [nodeId]. It's expected that [nodeId]
/// already contains type prefix.
Node._internal(this.nodeId) {
if (nodeId.contains("'")) {
throw ArgumentError("[nodeId] should not contain character <'>.");
if (nodeId.startsWith(r'[\w]+-')) {
throw ArgumentError('[nodeId] should start with the type prefix.');
List<int> get affectedInstances => <int>[];
String toString() => nodeId;
// ignore_for_file: prefer_initializing_formals
class ModificationNode<T> extends Node {
final int instanceId;
final Future Function(T) modification;
ModificationNode(String nodeId, this.instanceId, this.modification)
: super._internal('m-$nodeId');
List<int> get affectedInstances => [instanceId];
// TODO: consider to have both directed sync and bidirected sync.
class SynchronizationNode extends Node {
final int instanceId1, instanceId2;
SynchronizationNode(String nodeId, this.instanceId1, this.instanceId2)
: super._internal('s-$nodeId');
SynchronizationNode.generated(String nodeId, instanceId1, instanceId2)
: instanceId1 = instanceId1,
instanceId2 = instanceId2,
List<int> get affectedInstances => [instanceId1, instanceId2];