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115 lines
4.3 KiB
C++
115 lines
4.3 KiB
C++
//* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Url Classifier code
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*
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* The Initial Developer of the Original Code is
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* the Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Gian-Carlo Pascutto <gpascutto@mozilla.com>
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* Mehdi Mulani <mars.martian+bugmail@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsUrlClassifierPrefixSet_h_
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#define nsUrlClassifierPrefixSet_h_
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#include "nsISupportsUtils.h"
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#include "nsID.h"
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#include "nsIFile.h"
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#include "nsIUrlClassifierPrefixSet.h"
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#include "nsIMemoryReporter.h"
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#include "nsToolkitCompsCID.h"
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#include "mozilla/Mutex.h"
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#include "mozilla/CondVar.h"
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#include "mozilla/FileUtils.h"
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class nsPrefixSetReporter;
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class nsUrlClassifierPrefixSet : public nsIUrlClassifierPrefixSet
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{
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public:
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nsUrlClassifierPrefixSet();
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virtual ~nsUrlClassifierPrefixSet();
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// Can send an empty Array to clean the tree
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NS_IMETHOD SetPrefixes(const PRUint32* aArray, PRUint32 aLength);
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// Given prefixes must be in sorted order and bigger than
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// anything currently in the Prefix Set
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NS_IMETHOD AddPrefixes(const PRUint32* aArray, PRUint32 aLength);
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// Does the PrefixSet contain this prefix? not thread-safe
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NS_IMETHOD Contains(PRUint32 aPrefix, bool* aFound);
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// Do a lookup in the PrefixSet
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// if aReady is set, we will block until there are any entries
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// if not set, we will return in aReady whether we were ready or not
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NS_IMETHOD Probe(PRUint32 aPrefix, PRUint32 aKey, bool* aReady, bool* aFound);
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NS_IMETHOD IsEmpty(bool * aEmpty);
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NS_IMETHOD LoadFromFile(nsIFile* aFile);
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NS_IMETHOD StoreToFile(nsIFile* aFile);
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// Return a key that is used to randomize the collisions in the prefixes
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NS_IMETHOD GetKey(PRUint32* aKey);
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NS_DECL_ISUPPORTS
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// Return the estimated size of the set on disk and in memory,
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// in bytes
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size_t SizeOfIncludingThis(nsMallocSizeOfFun mallocSizeOf);
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protected:
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static const PRUint32 DELTAS_LIMIT = 100;
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static const PRUint32 MAX_INDEX_DIFF = (1 << 16);
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static const PRUint32 PREFIXSET_VERSION_MAGIC = 1;
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mozilla::Mutex mPrefixSetLock;
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mozilla::CondVar mSetIsReady;
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nsRefPtr<nsPrefixSetReporter> mReporter;
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PRUint32 BinSearch(PRUint32 start, PRUint32 end, PRUint32 target);
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nsresult LoadFromFd(mozilla::AutoFDClose & fileFd);
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nsresult StoreToFd(mozilla::AutoFDClose & fileFd);
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nsresult InitKey();
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// boolean indicating whether |setPrefixes| has been
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// called with a non-empty array.
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bool mHasPrefixes;
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// key used to randomize hash collisions
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PRUint32 mRandomKey;
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// the prefix for each index.
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nsTArray<PRUint32> mIndexPrefixes;
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// the value corresponds to the beginning of the run
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// (an index in |_deltas|) for the index
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nsTArray<PRUint32> mIndexStarts;
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// array containing deltas from indices.
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nsTArray<PRUint16> mDeltas;
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};
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#endif
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