| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| /** |
| * @author Jorge Bay Gondra |
| */ |
| 'use strict'; |
| |
| const utils = require('../utils'); |
| |
| class TraversalStrategies { |
| /** |
| * Creates a new instance of TraversalStrategies. |
| * @param {TraversalStrategies} [parent] The parent strategies from where to clone the values from. |
| * @constructor |
| */ |
| constructor(parent) { |
| if (parent) { |
| // Clone the strategies |
| this.strategies = [...parent.strategies]; |
| } |
| else { |
| this.strategies = []; |
| } |
| } |
| |
| /** @param {TraversalStrategy} strategy */ |
| addStrategy(strategy) { |
| this.strategies.push(strategy); |
| } |
| |
| /** |
| * @param {Traversal} traversal |
| * @returns {Promise} |
| */ |
| applyStrategies(traversal) { |
| // Apply all strategies serially |
| return this.strategies.reduce((promise, strategy) => { |
| return promise.then(() => strategy.apply(traversal)); |
| }, Promise.resolve()); |
| } |
| } |
| |
| /** @abstract */ |
| class TraversalStrategy { |
| |
| /** |
| * @abstract |
| * @param {Traversal} traversal |
| * @returns {Promise} |
| */ |
| apply(traversal) { |
| |
| } |
| } |
| |
| class VertexProgramStrategy extends TraversalStrategy { |
| |
| constructor(graphComputer, workers, persist, result, vertices, edges, configuration) { |
| super(); |
| this.configuration = new Map(); |
| if (graphComputer !== undefined) |
| this.configuration.set("graphComputer", graphComputer); |
| if (workers !== undefined) |
| this.configuration.set("workers", workers); |
| if (persist !== undefined) |
| this.configuration.set("persist", persist); |
| if (result !== undefined) |
| this.configuration.set("result", result); |
| if (vertices !== undefined) |
| this.configuration.set("vertices", vertices); |
| if (edges !== undefined) |
| this.configuration.set("edges", edges); |
| if (configuration !== undefined) |
| configuration.forEach(function(k,v) { |
| this.configuration.set(k, v); |
| }); |
| } |
| } |
| |
| module.exports = { |
| TraversalStrategies: TraversalStrategies, |
| TraversalStrategy: TraversalStrategy, |
| VertexProgramStrategy: VertexProgramStrategy |
| }; |