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