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/*
* Copyright (c) 2010 SURFnet bv
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*****************************************************************************
HandleFactory.h
This is a template class for handling handles ;-)
*****************************************************************************/
#ifndef _SOFTHSM_V2_HANDLEFACTORY_H
#define _SOFTHSM_V2_HANDLEFACTORY_H
#include "config.h"
#include "log.h"
#include "MutexFactory.h"
#include <map>
#include <queue>
template <class hType, class oType> class HandleFactory
{
public:
// Constructor
HandleFactory()
{
nextFree = (hType) 1;
handleMutex = MutexFactory::i()->getMutex();
}
// Destructor
virtual ~HandleFactory()
{
MutexFactory::i()->recycleMutex(handleMutex);
}
// Get a new handle for the specified object
hType getHandle(oType object)
{
MutexLocker lock(handleMutex);
hType handle;
if (!recycledHandles.empty())
{
handle = recycledHandles.front();
recycledHandles.pop();
}
else
{
handle = nextFree++;
}
handleMap[handle] = object;
return handle;
}
// Check whether the specified handle is valid
bool isValid(hType handle)
{
MutexLocker lock(handleMutex);
return (handleMap.find(handle) != handleMap.end());
}
// Return the object for the specified handle
oType getObjectByHandle(hType handle)
{
MutexLocker lock(handleMutex);
return handleMap[handle];
}
// Discard the specified handle
void deleteHandle(hType handle)
{
MutexLocker lock(handleMutex);
handleMap.erase(handle);
recycledHandles.push(handle);
}
private:
// The handle map
std::map<hType, oType> handleMap;
// The set of recycled handles
std::queue<hType> recycledHandles;
// The next free handle
hType nextFree;
// Cross-thread synchronisation
Mutex* handleMutex;
};
#endif // !_SOFTHSM_V2_HANDLEFACTORY_H
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