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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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125
dom/html/nsHTMLDNSPrefetch.h Normal file
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsHTMLDNSPrefetch_h___
#define nsHTMLDNSPrefetch_h___
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsIDNSListener.h"
#include "nsIWebProgressListener.h"
#include "nsWeakReference.h"
#include "nsIObserver.h"
class nsIDocument;
class nsITimer;
namespace mozilla {
namespace dom {
class Link;
} // namespace dom
} // namespace mozilla
namespace mozilla {
namespace net {
class NeckoParent;
} // namespace net
} // namespace mozilla
class nsHTMLDNSPrefetch
{
public:
// The required aDocument parameter is the context requesting the prefetch - under
// certain circumstances (e.g. headers, or security context) associated with
// the context the prefetch will not be performed.
static bool IsAllowed(nsIDocument *aDocument);
static nsresult Initialize();
static nsresult Shutdown();
// Call one of the Prefetch* methods to start the lookup.
//
// The URI versions will defer DNS lookup until pageload is
// complete, while the string versions submit the lookup to
// the DNS system immediately. The URI version is somewhat lighter
// weight, but its request is also more likely to be dropped due to a
// full queue and it may only be used from the main thread.
static nsresult PrefetchHigh(mozilla::dom::Link *aElement);
static nsresult PrefetchMedium(mozilla::dom::Link *aElement);
static nsresult PrefetchLow(mozilla::dom::Link *aElement);
static nsresult PrefetchHigh(const nsAString &host);
static nsresult PrefetchMedium(const nsAString &host);
static nsresult PrefetchLow(const nsAString &host);
static nsresult CancelPrefetchLow(const nsAString &host, nsresult aReason);
static nsresult CancelPrefetchLow(mozilla::dom::Link *aElement,
nsresult aReason);
private:
static nsresult Prefetch(const nsAString &host, uint16_t flags);
static nsresult Prefetch(mozilla::dom::Link *aElement, uint16_t flags);
static nsresult CancelPrefetch(const nsAString &hostname,
uint16_t flags,
nsresult aReason);
static nsresult CancelPrefetch(mozilla::dom::Link *aElement,
uint16_t flags,
nsresult aReason);
public:
class nsListener final : public nsIDNSListener
{
// This class exists to give a safe callback no-op DNSListener
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIDNSLISTENER
nsListener() {}
private:
~nsListener() {}
};
class nsDeferrals final: public nsIWebProgressListener
, public nsSupportsWeakReference
, public nsIObserver
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIWEBPROGRESSLISTENER
NS_DECL_NSIOBSERVER
nsDeferrals();
void Activate();
nsresult Add(uint16_t flags, mozilla::dom::Link *aElement);
private:
~nsDeferrals();
void Flush();
void SubmitQueue();
uint16_t mHead;
uint16_t mTail;
uint32_t mActiveLoaderCount;
nsCOMPtr<nsITimer> mTimer;
bool mTimerArmed;
static void Tick(nsITimer *aTimer, void *aClosure);
static const int sMaxDeferred = 512; // keep power of 2 for masking
static const int sMaxDeferredMask = (sMaxDeferred - 1);
struct deferred_entry
{
uint16_t mFlags;
nsWeakPtr mElement;
} mEntries[sMaxDeferred];
};
friend class mozilla::net::NeckoParent;
};
#endif