netwerk/base/src/nsDNSPrefetch.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* ***** BEGIN LICENSE BLOCK *****
   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   4  *
   5  * The contents of this file are subject to the Mozilla Public License Version
   6  * 1.1 (the "License"); you may not use this file except in compliance with
   7  * the License. You may obtain a copy of the License at
   8  * http://www.mozilla.org/MPL/
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  10  * Software distributed under the License is distributed on an "AS IS" basis,
  11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  12  * for the specific language governing rights and limitations under the
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  15  * The Original Code is Mozilla.
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  17  * The Initial Developer of the Original Code is
  18  * Mozilla Corporation.
  19  * Portions created by the Initial Developer are Copyright (C) 2008
  20  * the Initial Developer. All Rights Reserved.
  21  *
  22  * Contributor(s):
  23  *   Patrick McManus <mcmanus@ducksong.com>
  24  *
  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either of the GNU General Public License Version 2 or later (the "GPL"),
  27  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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  35  * the terms of any one of the MPL, the GPL or the LGPL.
  36  *
  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "nsDNSPrefetch.h"
  40 #include "nsCOMPtr.h"
  41 #include "nsString.h"
  42
  43 #include "nsNetUtil.h"
  44
  45 #include "nsIDNSListener.h"
  46 #include "nsIDNSRecord.h"
  47 #include "nsIDNSService.h"
  48 #include "nsICancelable.h"
  49
  50 static NS_DEFINE_CID(kDNSServiceCID, NS_DNSSERVICE_CID);
  51 static nsIDNSService *sDNSService = nsnull;
  52
  53 nsresult
  54 nsDNSPrefetch::Initialize(nsIDNSService *aDNSService)
  55 {
  56     NS_IF_RELEASE(sDNSService);
  57     sDNSService =  aDNSService;
  58     NS_IF_ADDREF(sDNSService);
  59     return NS_OK;
  60 }
  61
  62 nsresult
  63 nsDNSPrefetch::Shutdown()
  64 {
  65     NS_IF_RELEASE(sDNSService);
  66     return NS_OK;
  67 }
  68
  69 nsDNSPrefetch::nsDNSPrefetch(nsIURI *aURI)
  70 {
  71     aURI->GetAsciiHost(mHostname);
  72 }
  73
  74 nsresult
  75 nsDNSPrefetch::Prefetch(PRUint16 flags)
  76 {
  77     if (mHostname.IsEmpty())
  78         return NS_ERROR_NOT_AVAILABLE;
  79
  80     if (!sDNSService)
  81         return NS_ERROR_NOT_AVAILABLE;
  82
  83     nsCOMPtr<nsICancelable> tmpOutstanding;
  84
  85     return sDNSService->AsyncResolve(mHostname, flags, this, nsnull,
  86                                      getter_AddRefs(tmpOutstanding));
  87 }
  88
  89 nsresult
  90 nsDNSPrefetch::PrefetchLow()
  91 {
  92     return Prefetch(nsIDNSService::RESOLVE_PRIORITY_LOW);
  93 }
  94
  95 nsresult
  96 nsDNSPrefetch::PrefetchMedium()
  97 {
  98     return Prefetch(nsIDNSService::RESOLVE_PRIORITY_MEDIUM);
  99 }
 100
 101 nsresult
 102 nsDNSPrefetch::PrefetchHigh()
 103 {
 104     return Prefetch(0);
 105 }
 106
 107
 108 NS_IMPL_THREADSAFE_ISUPPORTS1(nsDNSPrefetch, nsIDNSListener)
 109
 110 NS_IMETHODIMP
 111 nsDNSPrefetch::OnLookupComplete(nsICancelable *request,
 112                                 nsIDNSRecord  *rec,
 113                                 nsresult       status)
 114 {
 115     return NS_OK;
 116 }