72 lines
1.2 KiB
JavaScript
72 lines
1.2 KiB
JavaScript
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/**
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* Module dependencies.
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*/
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var debug = require('debug')('axon:queue');
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/**
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* Queue plugin.
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*
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* Provides an `.enqueue()` method to the `sock`. Messages
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* passed to `enqueue` will be buffered until the next
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* `connect` event is emitted.
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*
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* Emits:
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*
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* - `drop` (msg) when a message is dropped
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* - `flush` (msgs) when the queue is flushed
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*
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* @param {Object} options
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* @api private
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*/
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module.exports = function(options){
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options = options || {};
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return function(sock){
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/**
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* Message buffer.
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*/
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sock.queue = [];
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/**
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* Flush `buf` on `connect`.
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*/
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sock.on('connect', function(){
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var prev = sock.queue;
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var len = prev.length;
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sock.queue = [];
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debug('flush %d messages', len);
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for (var i = 0; i < len; ++i) {
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this.send.apply(this, prev[i]);
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}
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sock.emit('flush', prev);
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});
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/**
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* Pushes `msg` into `buf`.
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*/
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sock.enqueue = function(msg){
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var hwm = sock.settings.hwm;
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if (sock.queue.length >= hwm) return drop(msg);
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sock.queue.push(msg);
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};
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/**
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* Drop the given `msg`.
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*/
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function drop(msg) {
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debug('drop');
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sock.emit('drop', msg);
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}
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};
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};
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