forked from sequelize/sequelize
-
Notifications
You must be signed in to change notification settings - Fork 0
/
query-chainer.js
142 lines (118 loc) · 3.77 KB
/
query-chainer.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
var Utils = require("./utils")
module.exports = (function() {
var QueryChainer = function(emitters) {
var self = this
this.finishedEmits = 0
this.emitters = []
this.serials = []
this.fails = []
this.serialResults = []
this.emitterResults = []
this.finished = false
this.wasRunning = false
this.eventEmitter = null
emitters = emitters || []
emitters.forEach(function(emitter) {
if(Array.isArray(emitter)) {
self.add.apply(self, emitter)
} else {
self.add(emitter)
}
})
}
QueryChainer.prototype.add = function(emitterOrKlass, method, params, options) {
if(!!method) {
this.serials.push({ klass: emitterOrKlass, method: method, params: params, options: options })
} else {
observeEmitter.call(this, emitterOrKlass)
this.emitters.push(emitterOrKlass)
}
return this
}
QueryChainer.prototype.run = function() {
var self = this
this.eventEmitter = new Utils.CustomEventEmitter(function() {
self.wasRunning = true
finish.call(self, 'emitterResults')
})
return this.eventEmitter.run()
}
QueryChainer.prototype.runSerially = function(options) {
var self = this
, serialCopy = Utils._.clone(this.serials)
options = Utils._.extend({
skipOnError: false
}, options)
var exec = function() {
var serial = self.serials.pop()
if(serial) {
serial.options = serial.options || {}
serial.options.before && serial.options.before(serial.klass)
var onSuccess = function() {
serial.options.after && serial.options.after(serial.klass)
self.finishedEmits++
exec()
}
var onError = function(err) {
serial.options.after && serial.options.after(serial.klass)
self.finishedEmits++
self.fails.push(err)
exec()
}
if(options.skipOnError && (self.fails.length > 0)) {
onError('Skipped due to earlier error!')
} else {
var emitter = serial.klass[serial.method].apply(serial.klass, serial.params)
emitter.success(function(result) {
self.serialResults[serialCopy.indexOf(serial)] = result
if(serial.options.success) {
serial.options.success(serial.klass, onSuccess)
} else {
onSuccess()
}
}).error(onError)
}
} else {
self.wasRunning = true
finish.call(self, 'serialResults')
}
}
this.serials.reverse()
this.eventEmitter = new Utils.CustomEventEmitter(exec)
return this.eventEmitter.run()
}
// private
var observeEmitter = function(emitter) {
var self = this
emitter
.success(function(result) {
self.emitterResults[self.emitters.indexOf(emitter)] = result
self.finishedEmits++
finish.call(self, 'emitterResults')
})
.error(function(err) {
self.finishedEmits++
self.fails.push(err)
finish.call(self, 'emitterResults')
})
.on('sql', function(sql) {
if(self.eventEmitter) {
self.eventEmitter.emit('sql', sql)
}
})
}
var finish = function(resultsName) {
this.finished = true
if(this.emitters.length > 0) {
this.finished = (this.finishedEmits == this.emitters.length)
} else if(this.serials.length > 0) {
this.finished = (this.finishedEmits == this.serials.length)
}
if(this.finished && this.wasRunning) {
var status = (this.fails.length == 0 ? 'success' : 'error')
, result = (this.fails.length == 0 ? this[resultsName] : this.fails)
this.eventEmitter.emit.apply(this.eventEmitter, [status, result].concat(result))
}
}
return QueryChainer
})()