/*
* 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
};