2a09d1a4
 liuqimichale
添加宜春 天水 宣化
|
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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
'use strict'
var util = require('util')
var EventEmitter = require('events').EventEmitter
var debug = {
server: require('debug')('spdy:window:server'),
client: require('debug')('spdy:window:client')
}
function Side (window, name, options) {
EventEmitter.call(this)
this.name = name
this.window = window
this.current = options.size
this.max = options.size
this.limit = options.max
this.lowWaterMark = options.lowWaterMark === undefined
? this.max / 2
: options.lowWaterMark
this._refilling = false
this._refillQueue = []
}
util.inherits(Side, EventEmitter)
Side.prototype.setMax = function setMax (max) {
this.window.debug('id=%d side=%s setMax=%d',
this.window.id,
this.name,
max)
this.max = max
this.lowWaterMark = this.max / 2
}
Side.prototype.updateMax = function updateMax (max) {
var delta = max - this.max
this.window.debug('id=%d side=%s updateMax=%d delta=%d',
this.window.id,
this.name,
max,
delta)
this.max = max
this.lowWaterMark = max / 2
this.update(delta)
}
Side.prototype.setLowWaterMark = function setLowWaterMark (lwm) {
this.lowWaterMark = lwm
}
Side.prototype.update = function update (size, callback) {
// Not enough space for the update, wait for refill
if (size <= 0 && callback && this.isEmpty()) {
this.window.debug('id=%d side=%s wait for refill=%d [%d/%d]',
this.window.id,
this.name,
-size,
this.current,
this.max)
this._refillQueue.push({
size: size,
callback: callback
})
return
}
this.current += size
if (this.current > this.limit) {
this.emit('overflow')
return
}
this.window.debug('id=%d side=%s update by=%d [%d/%d]',
this.window.id,
this.name,
size,
this.current,
this.max)
// Time to send WINDOW_UPDATE
if (size < 0 && this.isDraining()) {
this.window.debug('id=%d side=%s drained', this.window.id, this.name)
this.emit('drain')
}
// Time to write
if (size > 0 && this.current > 0 && this.current <= size) {
this.window.debug('id=%d side=%s full', this.window.id, this.name)
this.emit('full')
}
this._processRefillQueue()
if (callback) { process.nextTick(callback) }
}
Side.prototype.getCurrent = function getCurrent () {
return this.current
}
Side.prototype.getMax = function getMax () {
return this.max
}
Side.prototype.getDelta = function getDelta () {
return this.max - this.current
}
Side.prototype.isDraining = function isDraining () {
return this.current <= this.lowWaterMark
}
Side.prototype.isEmpty = function isEmpty () {
return this.current <= 0
}
// Private
Side.prototype._processRefillQueue = function _processRefillQueue () {
// Prevent recursion
if (this._refilling) {
return
}
this._refilling = true
while (this._refillQueue.length > 0) {
var item = this._refillQueue[0]
if (this.isEmpty()) {
break
}
this.window.debug('id=%d side=%s refilled for size=%d',
this.window.id,
this.name,
-item.size)
this._refillQueue.shift()
this.update(item.size, item.callback)
}
this._refilling = false
}
function Window (options) {
this.id = options.id
this.isServer = options.isServer
this.debug = this.isServer ? debug.server : debug.client
this.recv = new Side(this, 'recv', options.recv)
this.send = new Side(this, 'send', options.send)
}
module.exports = Window
Window.prototype.clone = function clone (id) {
return new Window({
id: id,
isServer: this.isServer,
recv: {
size: this.recv.max,
max: this.recv.limit,
lowWaterMark: this.recv.lowWaterMark
},
send: {
size: this.send.max,
max: this.send.limit,
lowWaterMark: this.send.lowWaterMark
}
})
}
|
