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root = true
[**]
indent_style = tab
tab_width = 4
charset = utf-8
end_of_line = lf

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Copyright (c) 2014-2023, Alex A. Naanou
Copyright (c) 2014, Alex A. Naanou
All rights reserved.
Redistribution and use in source and binary forms, with or without

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guaranteeEvents
===============
This module exports a single function that when passed an event(s) and an
[EventEmitter](http://nodejs.org/api/events.html#events_class_events_eventemitter)
compatible object will register a couple of handlers that
will provide the following functionality:
* Cache event data for each event of the given type that gets emitted.
* Call new handlers of the specified event with each of the prior event
data sets in order of event occurrence.
* Add a `.clearGuaranteedQueue(<event>)` method to the emitter to facilitate
event cache cleaning.
This is useful for modules like [glob](https://github.com/isaacs/node-glob)
that use the [EventEmitter](http://nodejs.org/api/events.html#events_class_events_eventemitter)
model to pass data to the user (see examples below).
This is similar to how state change handlers work in
[jQuery.Deferred](http://api.jquery.com/category/deferred-object/) or in
[Promise](https://promisesaplus.com/) objects.
Install
-------
```
$ npm install guarantee-events
```
Basic Examples
-------------
A synthetic example illustrating the basic functionality:
```javascript
var emitter = new (require('events').EventEmitter)
var guaranteeEvents = require('guarantee-events')
guaranteeEvents('event', emitter)
// emit some events...
emitter.emit('event', 'some data')
emitter.emit('event', 'some', 'more', 'data')
// Here the handler will be called for each event it missed...
emitter.on('event', function(){ console.log([].slice.apply(argumnts).join(' ')) })
emitter.emit('event', 'some data')
```
A real-life use-case using the excellent [glob](https://github.com/isaacs/node-glob)
utility:
```javascript
var glob = require('glob')
var guaranteeEvents = require('guarantee-events')
// build a glob object with cached 'match' and 'end' events...
var results = guaranteeEvents('match end', glob('**/*js'))
// Do stuff for some time...
// This will not miss a single result, regardless of how long it
// took to do stuff...
results.on('match', function(path){ console.log('found: '+path) })
```
Cache cleaning and use for long running emitters
------------------------------------------------
One of the dangers in using this in long running event emitters is _cache
buildup_ -- the data for each event emitted will get stored and this
might get quite large, this, if not managed, is a potential memory leak.
To deal with this issue a `.clearGuaranteedQueue(<event>)` method is
added to the emitter, this will clear the cache for a specific event.
This and has a shorthand form `.clearGuaranteedQueue('*')` that will
clear the cache for all wrapped events.
So for the above example:
```javascript
// This this will drop all the prior match data, so newly registred handlers
// will not see them...
// NOTE: this will not affect the underlaying glob object in any way.
results.clearGuaranteedQueue('match')
```

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*
**********************************************************************/
// Clear event cache...
//
// This is added as a method to the emitter passed to guaranteeEvents(..)...
//
// NOTE: his has the same event names semantics as guaranteeEvents(..)
// NOTE: for more info see docs for guaranteeEvents(..)
function clearGuaranteedQueue(names){
names = names == '*' ? Object.keys(this._guaranteed_queue)
: typeof(names) == typeof('str') ? names.split(/\s+/g)
: names
var that = this
names.forEach(function(name){
if(name in that._guaranteed_queue){
that._guaranteed_queue[name] = []
}
})
return this
}
// Guarantee that every event handler gets every event...
//
// guaranteeEvents('event', emitter)
@ -34,28 +12,45 @@ function clearGuaranteedQueue(names){
// -> emitter
//
//
// This will add a .clearGuaranteedQueue(..) method to the emitter that
// This will add a .clearGuarantedQueue(..) method to the emitter that
// will clear the event queue for a specific event.
//
// Clear event(s) queue(s)...
// emitter.clearGuaranteedQueue('event')
// emitter.clearGuaranteedQueue('eventA eventB ...')
// emitter.clearGuaranteedQueue(['eventA', 'eventB', ...])
// emitter.clearGuarantedQueue('event')
// emitter.clearGuarantedQueue('eventA eventB ...')
// emitter.clearGuarantedQueue(['eventA', 'eventB', ...])
// -> emitter
//
// Clear all queues...
// emitter.clearGuaranteedQueue('*')
// emitter.clearGuarantedQueue('*')
// -> emitter
//
//
// NOTE: the seen stack might get quite big, this is not recommended for
// long running emitters...
function guaranteeEvents(names, emitter){
//
var guaranteeEvents =
module.exports =
function(names, emitter){
names = typeof(names) == typeof('str') ? names.split(/\s+/g) : names
// add ability to clear the queue...
if(emitter.clearGuaranteedQueue == null){
emitter.clearGuaranteedQueue = clearGuaranteedQueue
if(emitter.clearGuarantedQueue == null){
emitter.clearGuarantedQueue = function(names){
names = names == '*' ? Object.keys(this._guaranteed_queue)
: typeof(names) == typeof('str') ? names.split(/\s+/g)
: names
var that = this
names.forEach(function(name){
if(name in that._guaranteed_queue){
that._guaranteed_queue[name] = []
}
})
return this
}
emitter._guaranteed_queue = {}
}
@ -86,10 +81,6 @@ function guaranteeEvents(names, emitter){
}
// this is the only thing we are exporting...
module.exports = guaranteeEvents
/**********************************************************************
* vim:set ts=4 sw=4 : */

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{
"name": "guarantee-events",
"version": "1.0.6",
"name": "guaranteeEvents",
"version": "1.0.0",
"description": "Guarantee that every event handler gets every event...",
"main": "index.js",
"scripts": {
@ -18,7 +18,7 @@
"event"
],
"author": "Alex A. Naanou <alex.nanou@gmail.com> (https://github.com/flynx)",
"license": "BSD-3-Clause",
"license": "New BSD",
"bugs": {
"url": "https://github.com/flynx/guaranteeEvents/issues"
},