async-dependency-graph
Version:
A dependency graph that can traverse asynchronous nodes.
274 lines • 20.1 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Node = exports.Graph = void 0;
var mutex_1 = require("./mutex");
/**
* Base dependency graph class.
*/
var Graph = /** @class */ (function () {
function Graph() {
this.nodes = {};
this.outgoingEdges = {};
this.incomingEdges = {};
}
/**
* Add a node to the graph.
* @param node Node object.
*/
Graph.prototype.addNode = function (node) {
if (this.hasNode(node.name))
throw new Error("A node with the name of \"" + node.name + "\" already exists in the graph!");
this.nodes[node.name] = node;
this.outgoingEdges[node.name] = [];
this.incomingEdges[node.name] = [];
};
/**
* Remove a node by name from the graph.
* @param name Node name.
*/
Graph.prototype.removeNode = function (name) {
if (!this.hasNode(name))
throw new Error("A node with the name of \"" + name + "\" does not exist in the graph!");
delete this.nodes[name];
delete this.outgoingEdges[name];
delete this.incomingEdges[name];
for (var dependent in this.incomingEdges) {
if (this.incomingEdges[dependent].includes(name))
this.incomingEdges[dependent].splice(dependent.indexOf(name), 1);
}
for (var dependency in this.outgoingEdges) {
if (this.outgoingEdges[dependency].includes(name))
this.outgoingEdges[dependency].splice(dependency.indexOf(name), 1);
}
};
/**
* Checks to see if the graph contains a Node by name.
* @param name Node name.
*/
Graph.prototype.hasNode = function (name) {
return this.nodes.hasOwnProperty(name);
};
Object.defineProperty(Graph.prototype, "size", {
/**
* Returns the number of nodes in a graph.
*/
get: function () {
return Object.keys(this.nodes).length;
},
enumerable: false,
configurable: true
});
/**
* Returns the Node instance given a node name.
* @param name Node name.
*/
Graph.prototype.getNode = function (name) {
if (this.hasNode(name))
return this.nodes[name];
throw new Error("Node \"" + name + "\" not found!");
};
/**
* Adds a node dependence. "from" is dependent on "to"
* @param from Node name.
* @param to Node name.
*/
Graph.prototype.addDependency = function (from, to) {
if (!this.hasNode(from))
throw new Error("Node does not exist: " + from);
if (!this.hasNode(to))
throw new Error("Node does not exist: " + to);
if (from === to)
throw new Error("Cannot add self dependency: " + to);
if (!this.outgoingEdges[from].includes(to)) {
this.outgoingEdges[from].push(to);
}
if (!this.incomingEdges[to].includes(from)) {
this.incomingEdges[to].push(from);
}
};
/**
* Removes a node dependence. "from" is no longer dependent on "to".
* @param from Node name.
* @param to Node name.
* @todo Test this function.
*/
Graph.prototype.removeDependency = function (from, to) {
console.warn('removeDependency() has not been tested.');
if (!this.hasNode(from))
throw new Error("Node does not exist: " + from);
if (!this.hasNode(to))
throw new Error("Node does not exist: " + to);
if (from === to)
throw new Error("Cannot remove self dependency: " + to);
if (!this.outgoingEdges[from].includes(to)) {
this.outgoingEdges[from].splice(this.outgoingEdges[from].indexOf(to), 1);
}
if (!this.incomingEdges[to].includes(from)) {
this.incomingEdges[to].splice(this.incomingEdges[to].indexOf(to), 1);
}
};
/**
* Get dependency node names for a Node by name. (Required nodes for this node to execute).
* @param name Node name.
*/
Graph.prototype.dependenciesOf = function (name) {
return this.outgoingEdges[name];
};
/**
* Get dependents node names for a Node by name. (Nodes that require this node to complete).
* @param name Node name.
*/
Graph.prototype.dependentsOf = function (name) {
return this.incomingEdges[name];
};
/**
* Breadth first search.
*/
Graph.prototype.traverse = function () {
var _this = this;
// Clear all complete node mutexes.
Object.keys(this.nodes).map(function (name) { return _this.getNode(name).clearMutex(); });
// Visiting a node recursively calls visit on each node's dependents.
var visit = function (node) {
// First await all dependencies
return Promise.all(_this.dependenciesOf(node.name).map(function (dependencyName) { return _this.nodes[dependencyName].awaitData(); }))
.then(function () {
node.signalDependenciesReady();
if (_this.dependentsOf(node.name).length > 0) {
// Then recursively visit all dependents
return Promise.all(_this.dependentsOf(node.name).map(function (dependentName) { return visit(_this.getNode(dependentName)); }));
}
else {
// node has no dependents so await data
return node.awaitData();
}
});
};
// Find nodes with no dependencies
var rootNodeNames = Object.keys(this.nodes).filter(function (name) { return _this.dependenciesOf(name).length === 0; });
if (rootNodeNames.length === 0 && Object.keys(this.nodes).length > 0)
return Promise.reject(new Error('The graph is circular. Cannot traverse graph due to no root node.'));
// Start recursive traversal from root nodes.
return Promise.all(rootNodeNames.map(function (name) { return visit(_this.nodes[name]); }));
};
/**
* Clears the value of a node and the values of dependent nodes
* @param name Node name.
*/
Graph.prototype.clearNodeAndDependents = function (name) {
var _this = this;
var node = this.getNode(name);
var visitAndClear = function (node) {
if (node.hasData()) {
node.clearData();
return Promise.all(_this.dependentsOf(node.name).map(function (dependentName) { return visitAndClear(_this.getNode(dependentName)); }));
}
else {
return Promise.resolve();
}
};
return visitAndClear(node);
};
/**
* Resets the graph by resetting each node in the graph.
*/
Graph.prototype.reset = function () {
for (var name in this.nodes) {
this.nodes[name].reset();
}
};
/**
* Prints graph nodes and node dependents.
*/
Graph.prototype.ls = function () {
for (var name in this.nodes) {
console.log(name);
console.log(this.dependentsOf(name));
}
};
return Graph;
}());
exports.Graph = Graph;
var Node = /** @class */ (function () {
function Node(name, promise) {
this.locked = false;
this._name = name;
this._promise = promise;
}
Object.defineProperty(Node.prototype, "name", {
get: function () {
return this._name;
},
enumerable: false,
configurable: true
});
/**
* Await data.
* @returns A `Promise<T | null>` that resolves when the node's data is ready.
*/
Node.prototype.awaitData = function () {
var _this = this;
if (!this.mutex) {
this.mutex = new mutex_1.Mutex(function () { return _this._data !== undefined; });
}
return new Promise(function (resolve, reject) {
_this.mutex.await(function (error) {
if (error)
return reject(error);
resolve(_this._data);
});
});
};
Node.prototype.signalDependenciesReady = function () {
var _this = this;
if (!this.mutex) {
this.mutex = new mutex_1.Mutex(function () { return _this._data !== undefined; });
}
if (this._data === undefined) {
// Only allow to _promise once
if (this.locked === true)
return;
this.locked = true;
var promise = this._promise();
if (promise === undefined)
throw new Error("Node \"" + this._name + "\" has undefined promise.");
promise.then(function (data) {
_this._data = data;
_this.locked = false;
_this.mutex.ready();
}).catch(function (error) {
_this._data = null;
_this.locked = false;
_this.mutex.ready(error);
});
}
else {
// Allow _data to be set externally from promise
this.mutex.ready();
}
};
Node.prototype.setData = function (data) {
this._data = data;
this.signalDependenciesReady();
};
/**
* Resets node. Clears all node data and resets its mutex.
*/
Node.prototype.reset = function () {
this.clearData();
this.clearMutex();
};
Node.prototype.clearMutex = function () {
if (this.hasData())
this.mutex = undefined;
};
Node.prototype.hasData = function () {
return this._data !== undefined;
};
Node.prototype.clearData = function () {
this._data = undefined;
};
return Node;
}());
exports.Node = Node;
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