86 lines
2.2 KiB
JavaScript
86 lines
2.2 KiB
JavaScript
'use strict';
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var events = require('events');
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var util = require('util');
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/**
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* The bus represents a connection to node, decoupled from the transport layer, that can
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* listen and subscribe to any events that are exposed by available services. Services
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* can expose events that can be subscribed to by implementing a `getPublishEvents` method.
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* @param {Object} params
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* @param {Node} params.node - A reference to the node
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*/
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function Bus(params) {
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events.EventEmitter.call(this);
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this.node = params.node;
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this.remoteAddress = params.remoteAddress;
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}
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util.inherits(Bus, events.EventEmitter);
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/**
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* This function will find the service that exposes the event by name and
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* call the associated subscribe method with the arguments excluding the
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* first argument of this function.
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* @param {String} name - The name of the event
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*/
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Bus.prototype.subscribe = function(name) {
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var events = [];
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for(var i in this.node.services) {
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var service = this.node.services[i];
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events = events.concat(service.getPublishEvents());
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}
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for (var j = 0; j < events.length; j++) {
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var event = events[j];
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var params = Array.prototype.slice.call(arguments).slice(1);
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params.unshift(this);
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if (name === event.name) {
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event.subscribe.apply(event.scope, params);
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}
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}
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};
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/**
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* The inverse of the subscribe method.
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* @param {String} name - The name of the event
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*/
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Bus.prototype.unsubscribe = function(name) {
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var events = [];
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for(var i in this.node.services) {
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var service = this.node.services[i];
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events = events.concat(service.getPublishEvents());
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}
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for (var j = 0; j < events.length; j++) {
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var event = events[j];
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var params = Array.prototype.slice.call(arguments).slice(1);
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params.unshift(this);
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if (name === event.name) {
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event.unsubscribe.apply(event.scope, params);
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}
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}
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};
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/**
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* This function will unsubscribe all events.
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*/
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Bus.prototype.close = function() {
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var events = [];
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for(var i in this.node.services) {
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var service = this.node.services[i];
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events = events.concat(service.getPublishEvents());
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}
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// Unsubscribe from all events
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for (var j = 0; j < events.length; j++) {
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var event = events[j];
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event.unsubscribe.call(event.scope, this);
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}
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};
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module.exports = Bus;
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