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/*
* Copyright (C) 2010 Julien Chaffraix <jchaffraix@webkit.org> All right reserved.
* Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
*
* 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 "core/xmlhttprequest/XMLHttpRequestProgressEventThrottle.h"
#include "core/EventTypeNames.h"
#include "core/xmlhttprequest/XMLHttpRequest.h"
#include "core/xmlhttprequest/XMLHttpRequestProgressEvent.h"
#include "wtf/Assertions.h"
#include "wtf/text/AtomicString.h"
namespace blink {
class XMLHttpRequestProgressEventThrottle::DeferredEvent {
public:
DeferredEvent() { clear(); }
void set(bool lengthComputable, unsigned long long loaded, unsigned long long total)
{
m_isDeferred = true;
m_lengthComputable = lengthComputable;
m_loaded = loaded;
m_total = total;
}
void clear()
{
m_isDeferred = false;
m_lengthComputable = false;
m_loaded = 0;
m_total = 0;
}
bool isDeferred() const { return m_isDeferred; }
bool lengthComputable() const { return m_lengthComputable; }
unsigned long long loaded() const { return m_loaded; }
unsigned long long total() const { return m_total; }
private:
unsigned long long m_loaded;
unsigned long long m_total;
bool m_isDeferred;
bool m_lengthComputable;
};
const double XMLHttpRequestProgressEventThrottle::minimumProgressEventDispatchingIntervalInSeconds = .05; // 50 ms per specification.
XMLHttpRequestProgressEventThrottle::XMLHttpRequestProgressEventThrottle(XMLHttpRequest* target)
: m_target(target)
, m_deferred(adoptPtr(new DeferredEvent))
{
ASSERT(target);
}
XMLHttpRequestProgressEventThrottle::~XMLHttpRequestProgressEventThrottle()
{
}
void XMLHttpRequestProgressEventThrottle::dispatchProgressEvent(const AtomicString& type, bool lengthComputable, unsigned long long loaded, unsigned long long total)
{
// Given that ResourceDispatcher doesn't deliver an event when suspended,
// we don't have to worry about event dispatching while suspended.
if (type != EventTypeNames::progress) {
m_target->dispatchEvent(XMLHttpRequestProgressEvent::create(type, lengthComputable, loaded, total));
return;
}
if (isActive()) {
m_deferred->set(lengthComputable, loaded, total);
} else {
m_target->dispatchEvent(XMLHttpRequestProgressEvent::create(type, lengthComputable, loaded, total));
startOneShot(minimumProgressEventDispatchingIntervalInSeconds, FROM_HERE);
}
}
void XMLHttpRequestProgressEventThrottle::dispatchReadyStateChangeEvent(PassRefPtrWillBeRawPtr<Event> event, DeferredEventAction action)
{
XMLHttpRequest::State state = m_target->readyState();
// Given that ResourceDispatcher doesn't deliver an event when suspended,
// we don't have to worry about event dispatching while suspended.
if (action == Flush) {
dispatchDeferredEvent();
// |m_target| is protected by the caller.
stop();
} else if (action == Clear) {
m_deferred->clear();
stop();
}
if (state == m_target->readyState()) {
// We don't dispatch the event when an event handler associated with
// the previously dispatched event changes the readyState (e.g. when
// the event handler calls xhr.abort()). In such cases a
// readystatechange should have been already dispatched if necessary.
m_target->dispatchEvent(event);
}
}
void XMLHttpRequestProgressEventThrottle::dispatchDeferredEvent()
{
if (m_deferred->isDeferred()) {
m_target->dispatchEvent(XMLHttpRequestProgressEvent::create(EventTypeNames::progress, m_deferred->lengthComputable(), m_deferred->loaded(), m_deferred->total()));
m_deferred->clear();
}
}
void XMLHttpRequestProgressEventThrottle::fired()
{
if (!m_deferred->isDeferred()) {
// No "progress" event was queued since the previous dispatch, we can
// safely stop the timer.
return;
}
dispatchDeferredEvent();
// Watch if another "progress" ProgressEvent arrives in the next 50ms.
startOneShot(minimumProgressEventDispatchingIntervalInSeconds, FROM_HERE);
}
void XMLHttpRequestProgressEventThrottle::suspend()
{
stop();
}
void XMLHttpRequestProgressEventThrottle::resume()
{
if (!m_deferred->isDeferred())
return;
// Do not dispatch events inline here, since ExecutionContext is iterating
// over the list of active DOM objects to resume them, and any activated JS
// event-handler could insert new active DOM objects to the list.
startOneShot(0, FROM_HERE);
}
DEFINE_TRACE(XMLHttpRequestProgressEventThrottle)
{
visitor->trace(m_target);
}
} // namespace blink
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