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
|
/*
* Copyright (C) 2010 Julien Chaffraix <jchaffraix@webkit.org>
* All right reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "XMLHttpRequestProgressEventThrottle.h"
#include "EventTarget.h"
#include "XMLHttpRequestProgressEvent.h"
namespace WebCore {
const double XMLHttpRequestProgressEventThrottle::minimumProgressEventDispatchingIntervalInSeconds = .05; // 50 ms per specification.
XMLHttpRequestProgressEventThrottle::XMLHttpRequestProgressEventThrottle(EventTarget* target)
: m_target(target)
, m_loaded(0)
, m_total(0)
, m_suspended(false)
{
ASSERT(target);
}
XMLHttpRequestProgressEventThrottle::~XMLHttpRequestProgressEventThrottle()
{
}
void XMLHttpRequestProgressEventThrottle::dispatchProgressEvent(bool lengthComputable, unsigned loaded, unsigned total)
{
ASSERT(!suspended());
if (!isActive()) {
// The timer is not active so the least frequent event for now is every byte.
// Just go ahead and dispatch the event.
// We should not have any pending loaded & total information from a previous run.
ASSERT(!m_loaded);
ASSERT(!m_total);
dispatchEvent(XMLHttpRequestProgressEvent::create(eventNames().progressEvent, lengthComputable, loaded, total));
startRepeating(minimumProgressEventDispatchingIntervalInSeconds);
return;
}
// The timer is already active so minimumProgressEventDispatchingIntervalInSeconds is the least frequent event.
m_lengthComputable = lengthComputable;
m_loaded = loaded;
m_total = total;
}
void XMLHttpRequestProgressEventThrottle::dispatchEvent(PassRefPtr<Event> event, ProgressEventAction progressEventAction)
{
ASSERT(!suspended());
// We should not have any pending events from a previous resume.
ASSERT(!m_pausedEvent);
if (progressEventAction == FlushProgressEvent)
flushProgressEvent();
m_target->dispatchEvent(event);
}
void XMLHttpRequestProgressEventThrottle::flushProgressEvent()
{
if (!hasEventToDispatch())
return;
PassRefPtr<Event> event = XMLHttpRequestProgressEvent::create(eventNames().progressEvent, m_lengthComputable, m_loaded, m_total);
m_loaded = 0;
m_total = 0;
// We stop the timer as this is called when no more events are supposed to occur.
stop();
m_target->dispatchEvent(event);
}
void XMLHttpRequestProgressEventThrottle::dispatchPausedEvent()
{
ASSERT(!suspended());
if (!m_pausedEvent)
return;
m_target->dispatchEvent(m_pausedEvent);
m_pausedEvent = 0;
}
void XMLHttpRequestProgressEventThrottle::fired()
{
ASSERT(isActive());
ASSERT(!suspended());
ASSERT(!m_pausedEvent);
if (!hasEventToDispatch()) {
// No progress event was queued since the previous dispatch, we can safely stop the timer.
stop();
return;
}
m_target->dispatchEvent(XMLHttpRequestProgressEvent::create(eventNames().progressEvent, m_lengthComputable, m_loaded, m_total));
m_total = 0;
m_loaded = 0;
}
bool XMLHttpRequestProgressEventThrottle::hasEventToDispatch() const
{
return (m_total || m_loaded) && isActive();
}
void XMLHttpRequestProgressEventThrottle::suspend()
{
ASSERT(!m_pausedEvent);
m_suspended = true;
// If we have a progress event waiting to be dispatched,
// just queue it.
if (hasEventToDispatch()) {
m_pausedEvent = XMLHttpRequestProgressEvent::create(eventNames().progressEvent, m_lengthComputable, m_loaded, m_total);
m_total = 0;
m_loaded = 0;
}
stop();
}
void XMLHttpRequestProgressEventThrottle::resume()
{
ASSERT(!m_loaded);
ASSERT(!m_total);
m_suspended = false;
dispatchPausedEvent();
}
} // namespace WebCore
|
