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gecko-dev/xpcom/glue/nsBaseHashtable.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is C++ hashtable templates.
*
* The Initial Developer of the Original Code is
* Benjamin Smedberg.
* Portions created by the Initial Developer are Copyright (C) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsBaseHashtable_h__
#define nsBaseHashtable_h__
#include "nsTHashtable.h"
#include "prlock.h"
#include "nsDebug.h"
template<class KeyClass,class DataType,class UserDataType>
class nsBaseHashtable; // forward declaration
/**
* the private nsTHashtable::EntryType class used by nsBaseHashtable
* @see nsTHashtable for the specification of this class
* @see nsBaseHashtable for template parameters
*/
template<class KeyClass,class DataType>
class nsBaseHashtableET : public KeyClass
{
public:
DataType mData;
friend class nsTHashtable< nsBaseHashtableET<KeyClass,DataType> >;
private:
typedef typename KeyClass::KeyType KeyType;
typedef typename KeyClass::KeyTypePointer KeyTypePointer;
nsBaseHashtableET(KeyTypePointer aKey);
nsBaseHashtableET(nsBaseHashtableET<KeyClass,DataType>& toCopy);
~nsBaseHashtableET();
};
/**
* templated hashtable for simple data types
* This class manages simple data types that do not need construction or
* destruction.
*
* @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
* for a complete specification.
* @param DataType the datatype stored in the hashtable,
* for example, PRUint32 or nsCOMPtr. If UserDataType is not the same,
* DataType must implicitly cast to UserDataType
* @param UserDataType the user sees, for example PRUint32 or nsISupports*
*/
template<class KeyClass,class DataType,class UserDataType>
class nsBaseHashtable :
protected nsTHashtable< nsBaseHashtableET<KeyClass,DataType> >
{
public:
typedef typename KeyClass::KeyType KeyType;
typedef nsBaseHashtableET<KeyClass,DataType> EntryType;
// default constructor+destructor are fine
/**
* Initialize the object.
* @param initSize the initial number of buckets in the hashtable,
* default 16
* locking on all class methods
* @return true if the object was initialized properly.
*/
bool Init(PRUint32 initSize = PL_DHASH_MIN_SIZE)
{ return nsTHashtable<EntryType>::Init(initSize); }
/**
* Check whether the table has been initialized.
* This function is especially useful for static hashtables.
* @return true if the table has been initialized.
*/
bool IsInitialized() const { return !!this->mTable.entrySize; }
/**
* Return the number of entries in the table.
* @return number of entries
*/
PRUint32 Count() const
{ return nsTHashtable<EntryType>::Count(); }
/**
* retrieve the value for a key.
* @param aKey the key to retreive
* @param pData data associated with this key will be placed at this
* pointer. If you only need to check if the key exists, pData
* may be null.
* @return true if the key exists. If key does not exist, pData is not
* modified.
*/
bool Get(KeyType aKey, UserDataType* pData NS_OUTPARAM) const
{
EntryType* ent = this->GetEntry(aKey);
if (!ent)
return false;
if (pData)
*pData = ent->mData;
return true;
}
/**
* For pointer types, get the value, returning NULL if the entry is not
* present in the table.
*
* @param aKey the key to retrieve
* @return The found value, or NULL if no entry was found with the given key.
* @note If NULL values are stored in the table, it is not possible to
* distinguish between a NULL value and a missing entry.
*/
UserDataType Get(KeyType aKey) const
{
EntryType* ent = this->GetEntry(aKey);
if (!ent)
return NULL;
return ent->mData;
}
/**
* put a new value for the associated key
* @param aKey the key to put
* @param aData the new data
* @return always true, unless memory allocation failed
*/
bool Put(KeyType aKey, UserDataType aData)
{
EntryType* ent = this->PutEntry(aKey);
if (!ent)
return false;
ent->mData = aData;
return true;
}
/**
* remove the data for the associated key
* @param aKey the key to remove from the hashtable
*/
void Remove(KeyType aKey) { this->RemoveEntry(aKey); }
/**
* function type provided by the application for enumeration.
* @param aKey the key being enumerated
* @param aData data being enumerated
* @parm userArg passed unchanged from Enumerate
* @return either
* @link PLDHashOperator::PL_DHASH_NEXT PL_DHASH_NEXT @endlink or
* @link PLDHashOperator::PL_DHASH_STOP PL_DHASH_STOP @endlink
*/
typedef PLDHashOperator
(* EnumReadFunction)(KeyType aKey,
UserDataType aData,
void* userArg);
/**
* enumerate entries in the hashtable, without allowing changes
* @param enumFunc enumeration callback
* @param userArg passed unchanged to the EnumReadFunction
*/
PRUint32 EnumerateRead(EnumReadFunction enumFunc, void* userArg) const
{
NS_ASSERTION(this->mTable.entrySize,
"nsBaseHashtable was not initialized properly.");
s_EnumReadArgs enumData = { enumFunc, userArg };
return PL_DHashTableEnumerate(const_cast<PLDHashTable*>(&this->mTable),
s_EnumReadStub,
&enumData);
}
/**
* function type provided by the application for enumeration.
* @param aKey the key being enumerated
* @param aData Reference to data being enumerated, may be altered. e.g. for
* nsInterfaceHashtable this is an nsCOMPtr reference...
* @parm userArg passed unchanged from Enumerate
* @return bitflag combination of
* @link PLDHashOperator::PL_DHASH_REMOVE @endlink,
* @link PLDHashOperator::PL_DHASH_NEXT PL_DHASH_NEXT @endlink, or
* @link PLDHashOperator::PL_DHASH_STOP PL_DHASH_STOP @endlink
*/
typedef PLDHashOperator
(* EnumFunction)(KeyType aKey,
DataType& aData,
void* userArg);
/**
* enumerate entries in the hashtable, allowing changes. This
* functions write-locks the hashtable.
* @param enumFunc enumeration callback
* @param userArg passed unchanged to the EnumFunction
*/
PRUint32 Enumerate(EnumFunction enumFunc, void* userArg)
{
NS_ASSERTION(this->mTable.entrySize,
"nsBaseHashtable was not initialized properly.");
s_EnumArgs enumData = { enumFunc, userArg };
return PL_DHashTableEnumerate(&this->mTable,
s_EnumStub,
&enumData);
}
/**
* reset the hashtable, removing all entries
*/
void Clear() { nsTHashtable<EntryType>::Clear(); }
/**
* client must provide a SizeOfEntryExcludingThisFun function for
* SizeOfExcludingThis.
* @param aKey the key being enumerated
* @param aData Reference to data being enumerated.
* @param mallocSizeOf the function used to measure heap-allocated blocks
* @param userArg passed unchanged from SizeOf{In,Ex}cludingThis
* @return summed size of the things pointed to by the entries
*/
typedef size_t
(* SizeOfEntryExcludingThisFun)(KeyType aKey,
const DataType &aData,
nsMallocSizeOfFun mallocSizeOf,
void* userArg);
/**
* Measure the size of the table's entry storage, and if
* |sizeOfEntryExcludingThis| is non-NULL, measure the size of things pointed
* to by entries.
*
* @param sizeOfEntryExcludingThis the
* <code>SizeOfEntryExcludingThisFun</code> function to call
* @param mallocSizeOf the function used to measure heap-allocated blocks
* @param userArg a pointer to pass to the
* <code>SizeOfEntryExcludingThisFun</code> function
* @return the summed size of all the entries
*/
size_t SizeOfExcludingThis(SizeOfEntryExcludingThisFun sizeOfEntryExcludingThis,
nsMallocSizeOfFun mallocSizeOf, void *userArg = NULL)
{
if (IsInitialized()) {
s_SizeOfArgs args = { sizeOfEntryExcludingThis, userArg };
return PL_DHashTableSizeOfExcludingThis(&this->mTable,
s_SizeOfStub,
mallocSizeOf,
&args);
}
return 0;
}
protected:
/**
* used internally during EnumerateRead. Allocated on the stack.
* @param func the enumerator passed to EnumerateRead
* @param userArg the userArg passed to EnumerateRead
*/
struct s_EnumReadArgs
{
EnumReadFunction func;
void* userArg;
};
static PLDHashOperator s_EnumReadStub(PLDHashTable *table,
PLDHashEntryHdr *hdr,
PRUint32 number,
void *arg);
struct s_EnumArgs
{
EnumFunction func;
void* userArg;
};
static PLDHashOperator s_EnumStub(PLDHashTable *table,
PLDHashEntryHdr *hdr,
PRUint32 number,
void *arg);
struct s_SizeOfArgs
{
SizeOfEntryExcludingThisFun func;
void* userArg;
};
static size_t s_SizeOfStub(PLDHashEntryHdr *entry,
nsMallocSizeOfFun mallocSizeOf,
void *arg);
};
/**
* This class is a thread-safe version of nsBaseHashtable.
*/
template<class KeyClass,class DataType,class UserDataType>
class nsBaseHashtableMT :
protected nsBaseHashtable<KeyClass,DataType,UserDataType>
{
public:
typedef typename
nsBaseHashtable<KeyClass,DataType,UserDataType>::EntryType EntryType;
typedef typename
nsBaseHashtable<KeyClass,DataType,UserDataType>::KeyType KeyType;
typedef typename
nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumFunction EnumFunction;
typedef typename
nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumReadFunction EnumReadFunction;
nsBaseHashtableMT() : mLock(nsnull) { }
~nsBaseHashtableMT();
bool Init(PRUint32 initSize = PL_DHASH_MIN_SIZE);
bool IsInitialized() const { return mLock != nsnull; }
PRUint32 Count() const;
bool Get(KeyType aKey, UserDataType* pData) const;
bool Put(KeyType aKey, UserDataType aData);
void Remove(KeyType aKey);
PRUint32 EnumerateRead(EnumReadFunction enumFunc, void* userArg) const;
PRUint32 Enumerate(EnumFunction enumFunc, void* userArg);
void Clear();
protected:
PRLock* mLock;
};
//
// nsBaseHashtableET definitions
//
template<class KeyClass,class DataType>
nsBaseHashtableET<KeyClass,DataType>::nsBaseHashtableET(KeyTypePointer aKey) :
KeyClass(aKey)
{ }
template<class KeyClass,class DataType>
nsBaseHashtableET<KeyClass,DataType>::nsBaseHashtableET
(nsBaseHashtableET<KeyClass,DataType>& toCopy) :
KeyClass(toCopy),
mData(toCopy.mData)
{ }
template<class KeyClass,class DataType>
nsBaseHashtableET<KeyClass,DataType>::~nsBaseHashtableET()
{ }
//
// nsBaseHashtable definitions
//
template<class KeyClass,class DataType,class UserDataType>
PLDHashOperator
nsBaseHashtable<KeyClass,DataType,UserDataType>::s_EnumReadStub
(PLDHashTable *table, PLDHashEntryHdr *hdr, PRUint32 number, void* arg)
{
EntryType* ent = static_cast<EntryType*>(hdr);
s_EnumReadArgs* eargs = (s_EnumReadArgs*) arg;
PLDHashOperator res = (eargs->func)(ent->GetKey(), ent->mData, eargs->userArg);
NS_ASSERTION( !(res & PL_DHASH_REMOVE ),
"PL_DHASH_REMOVE return during const enumeration; ignoring.");
if (res & PL_DHASH_STOP)
return PL_DHASH_STOP;
return PL_DHASH_NEXT;
}
template<class KeyClass,class DataType,class UserDataType>
PLDHashOperator
nsBaseHashtable<KeyClass,DataType,UserDataType>::s_EnumStub
(PLDHashTable *table, PLDHashEntryHdr *hdr, PRUint32 number, void* arg)
{
EntryType* ent = static_cast<EntryType*>(hdr);
s_EnumArgs* eargs = (s_EnumArgs*) arg;
return (eargs->func)(ent->GetKey(), ent->mData, eargs->userArg);
}
template<class KeyClass,class DataType,class UserDataType>
size_t
nsBaseHashtable<KeyClass,DataType,UserDataType>::s_SizeOfStub
(PLDHashEntryHdr *hdr, nsMallocSizeOfFun mallocSizeOf, void *arg)
{
EntryType* ent = static_cast<EntryType*>(hdr);
s_SizeOfArgs* eargs = static_cast<s_SizeOfArgs*>(arg);
return (eargs->func)(ent->GetKey(), ent->mData, mallocSizeOf, eargs->userArg);
}
//
// nsBaseHashtableMT definitions
//
template<class KeyClass,class DataType,class UserDataType>
nsBaseHashtableMT<KeyClass,DataType,UserDataType>::~nsBaseHashtableMT()
{
if (this->mLock)
PR_DestroyLock(this->mLock);
}
template<class KeyClass,class DataType,class UserDataType>
bool
nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Init(PRUint32 initSize)
{
if (!nsTHashtable<EntryType>::IsInitialized() && !nsTHashtable<EntryType>::Init(initSize))
return false;
this->mLock = PR_NewLock();
NS_ASSERTION(this->mLock, "Error creating lock during nsBaseHashtableL::Init()");
return (this->mLock != nsnull);
}
template<class KeyClass,class DataType,class UserDataType>
PRUint32
nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Count() const
{
PR_Lock(this->mLock);
PRUint32 count = nsTHashtable<EntryType>::Count();
PR_Unlock(this->mLock);
return count;
}
template<class KeyClass,class DataType,class UserDataType>
bool
nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Get(KeyType aKey,
UserDataType* pData) const
{
PR_Lock(this->mLock);
bool res =
nsBaseHashtable<KeyClass,DataType,UserDataType>::Get(aKey, pData);
PR_Unlock(this->mLock);
return res;
}
template<class KeyClass,class DataType,class UserDataType>
bool
nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Put(KeyType aKey,
UserDataType aData)
{
PR_Lock(this->mLock);
bool res =
nsBaseHashtable<KeyClass,DataType,UserDataType>::Put(aKey, aData);
PR_Unlock(this->mLock);
return res;
}
template<class KeyClass,class DataType,class UserDataType>
void
nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Remove(KeyType aKey)
{
PR_Lock(this->mLock);
nsBaseHashtable<KeyClass,DataType,UserDataType>::Remove(aKey);
PR_Unlock(this->mLock);
}
template<class KeyClass,class DataType,class UserDataType>
PRUint32
nsBaseHashtableMT<KeyClass,DataType,UserDataType>::EnumerateRead
(EnumReadFunction fEnumCall, void* userArg) const
{
PR_Lock(this->mLock);
PRUint32 count =
nsBaseHashtable<KeyClass,DataType,UserDataType>::EnumerateRead(fEnumCall, userArg);
PR_Unlock(this->mLock);
return count;
}
template<class KeyClass,class DataType,class UserDataType>
PRUint32
nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Enumerate
(EnumFunction fEnumCall, void* userArg)
{
PR_Lock(this->mLock);
PRUint32 count =
nsBaseHashtable<KeyClass,DataType,UserDataType>::Enumerate(fEnumCall, userArg);
PR_Unlock(this->mLock);
return count;
}
template<class KeyClass,class DataType,class UserDataType>
void
nsBaseHashtableMT<KeyClass,DataType,UserDataType>::Clear()
{
PR_Lock(this->mLock);
nsBaseHashtable<KeyClass,DataType,UserDataType>::Clear();
PR_Unlock(this->mLock);
}
#endif // nsBaseHashtable_h__
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