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node-red/nodes/core/89-rate.js

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/**
* Copyright 2013 IBM Corp.
*
* Licensed 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.
**/
// Simple node to introduce a pause into a flow
// Require main module
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var RED = require("../../red/red");
// main node definition
function RateLimitNode(n) {
RED.nodes.createNode(this,n);
this.buffer = [];
this.timeout = 1000/n.rate;
this.name = n.name
var node= this
this.intervalID = setInterval(function() {
if (node.buffer.length > 0) {
node.send(node.buffer.shift());
}
},this.timeout);
this.on("input", function(msg) {
this.buffer.push(msg);
});
}
// register node
RED.nodes.registerType("rateLimit",RateLimitNode);
RateLimitNode.prototype.close = function() {
clearInterval(this.intervalID);
this.buffer = [];
}