## Xalan-C++ API Documentation

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# XalanObjectCache.hpp

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    00001 /*
    00002  * The Apache Software License, Version 1.1
    00003  *
    00004  *
    00005  * Copyright (c) 1999-2002 The Apache Software Foundation.  All rights
    00006  * reserved.
    00007  *
    00008  * Redistribution and use in source and binary forms, with or without
    00009  * modification, are permitted provided that the following conditions
    00010  * are met:
    00011  *
    00012  * 1. Redistributions of source code must retain the above copyright
    00013  *    notice, this list of conditions and the following disclaimer.
    00014  *
    00015  * 2. Redistributions in binary form must reproduce the above copyright
    00016  *    notice, this list of conditions and the following disclaimer in
    00017  *    the documentation and/or other materials provided with the
    00018  *    distribution.
    00019  *
    00020  * 3. The end-user documentation included with the redistribution,
    00021  *    if any, must include the following acknowledgment:
    00022  *       "This product includes software developed by the
    00023  *        Apache Software Foundation (http://www.apache.org/)."
    00024  *    Alternately, this acknowledgment may appear in the software itself,
    00025  *    if and wherever such third-party acknowledgments normally appear.
    00026  *
    00027  * 4. The names "Xalan" and "Apache Software Foundation" must
    00028  *    not be used to endorse or promote products derived from this
    00029  *    software without prior written permission. For written
    00030  *    permission, please contact apache@apache.org.
    00031  *
    00032  * 5. Products derived from this software may not be called "Apache",
    00033  *    nor may "Apache" appear in their name, without prior written
    00034  *    permission of the Apache Software Foundation.
    00035  *
    00036  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    00037  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    00038  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    00039  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
    00040  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    00041  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    00042  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    00043  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    00044  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    00045  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    00046  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    00047  * SUCH DAMAGE.
    00048  * ====================================================================
    00049  *
    00050  * This software consists of voluntary contributions made by many
    00051  * individuals on behalf of the Apache Software Foundation and was
    00052  * originally based on software copyright (c) 1999, International
    00053  * Business Machines, Inc., http://www.ibm.com.  For more
    00054  * information on the Apache Software Foundation, please see
    00055  * <http://www.apache.org/>.
    00056  */
    00057 #if !defined(XALAN_OBJECTCACHE_HEADER_GUARD)
    00058 #define XALAN_OBJECTCACHE_HEADER_GUARD
    00059
    00060
    00061
    00062 #include <algorithm>
    00063 #include <vector>
    00064
    00065
    00066
    00067 #include <xalanc/Include/STLHelper.hpp>
    00068 #include <xalanc/Include/XalanAutoPtr.hpp>
    00069
    00070
    00071
    00072 XALAN_CPP_NAMESPACE_BEGIN
    00073
    00074
    00075
    00076 template<class ObjectType>
    00077 class DefaultCacheCreateFunctor
    00078 {
    00079 public:
    00080
    00081     ObjectType*
    00082 	operator()() const
    00083     {
    00084         return new ObjectType;
    00085     }
    00086 };
    00087
    00088
    00089
    00090 template<class ObjectType>
    00091 class DefaultCacheResetFunctor
    00092 {
    00093 public:
    00094
    00095     void
    00096 	operator()(ObjectType*) const
    00097     {
    00098     }
    00099 };
    00100
    00101
    00102
    00103 template<class ObjectType>
    00104 class ClearCacheResetFunctor
    00105 {
    00106 public:
    00107
    00108     void
    00109 	operator()(ObjectType* theInstance) const
    00110     {
    00111         theInstance->clear();
    00112     }
    00113 };
    00114
    00115
    00116
    00117 #if defined(XALAN_OBJECT_CACHE_KEEP_BUSY_LIST)
    00118
    00119 template<
    00120 class ObjectType,
    00121 #if defined(XALAN_NO_DEFAULT_TEMPLATE_ARGUMENTS)
    00122 class CreateFunctorType,
    00123 class DeleteFunctorType,
    00124 class ResetFunctorType>
    00125 #else
    00126 class CreateFunctorType = DefaultCacheCreateFunctor<ObjectType>,
    00127 class DeleteFunctorType = DeleteFunctor<ObjectType>,
    00128 class ResetFunctorType = DefaultCacheResetFunctor<ObjectType> >
    00129 #endif
    00130 class XalanObjectCache
    00131 {
    00132 public:
    00133
    00134 #if defined(XALAN_NO_STD_NAMESPACE)
    00135     typedef vector<ObjectType*>         VectorType;
    00136 #else
    00137     typedef std::vector<ObjectType*>    VectorType;
    00138 #endif
    00139
    00140     typedef ObjectType  CacheObjectType;
    00141
    00142     explicit
    00143     XalanObjectCache(unsigned int   initialListSize = 0) :
    00144         m_availableList(),
    00145         m_busyList()
    00146     {
    00147         m_availableList.reserve(initialListSize);
    00148
    00149         m_busyList.reserve(initialListSize);
    00150     }
    00151
    00152     ~XalanObjectCache()
    00153     {
    00154         reset();
    00155
    00156 #if !defined(XALAN_NO_STD_NAMESPACE)
    00157         using std::for_each;
    00158 #endif
    00159
    00160         for_each(
    00161                 m_availableList.begin(),
    00162                 m_availableList.end(),
    00163                 m_deleteFunctor);
    00164     }
    00165
    00166     ObjectType*
    00167     get()
    00168     {
    00169         // We'll always return the back of the free list, since
    00170         // that's the cheapest thing.
    00171         if (m_availableList.empty() == true)
    00172         {
    00173             ObjectType* const   theNewObject = m_createFunctor();
    00174
    00175             m_busyList.push_back(theNewObject);
    00176
    00177             return theNewObject;
    00178         }
    00179         else
    00180         {
    00181             ObjectType* const   theObject = m_availableList.back();
    00182
    00183             m_busyList.push_back(theObject);
    00184
    00185             m_availableList.pop_back();
    00186
    00187             return theObject;
    00188         }
    00189     }
    00190
    00191     bool
    00192     release(ObjectType*     theInstance)
    00193     {
    00194 #if !defined(XALAN_NO_STD_NAMESPACE)
    00195         using std::find;
    00196 #endif
    00197
    00198         typedef typename VectorType::iterator   IteratorType;
    00199
    00200         const IteratorType  i =
    00201             find(
    00202                 m_busyList.begin(),
    00203                 m_busyList.end(),
    00204                 theInstance);
    00205
    00206         if (i == m_busyList.end())
    00207         {
    00208             return false;
    00209         }
    00210         else
    00211         {
    00212             m_resetFunctor(theInstance);
    00213
    00214             m_availableList.push_back(theInstance);
    00215
    00216             m_busyList.erase(i);
    00217
    00218             return true;
    00219         }
    00220     }
    00221
    00222     void
    00223     reset()
    00224     {
    00225         while (m_busyList.empty() == false)
    00226         {
    00227             ObjectType* const   theInstance = m_busyList.back();
    00228
    00229             m_resetFunctor(theInstance);
    00230
    00231             m_availableList.push_back(theInstance);
    00232
    00233             m_busyList.pop_back();
    00234         }
    00235     }
    00236
    00237     // Functors for various operations...
    00238     CreateFunctorType   m_createFunctor;
    00239
    00240     DeleteFunctorType   m_deleteFunctor;
    00241
    00242     ResetFunctorType    m_resetFunctor;
    00243
    00244 private:
    00245
    00246     // There are not defined...
    00247     XalanObjectCache(const XalanObjectCache<ObjectType, CreateFunctorType, DeleteFunctorType, ResetFunctorType>&    theRHS);
    00248
    00249     XalanObjectCache<ObjectType, CreateFunctorType, DeleteFunctorType, ResetFunctorType>&
    00250     operator=(const XalanObjectCache<ObjectType, CreateFunctorType, DeleteFunctorType, ResetFunctorType>&   theRHS);
    00251
    00252
    00253     // Data members...
    00254     VectorType          m_availableList;
    00255
    00256     VectorType          m_busyList;
    00257 };
    00258
    00259
    00260
    00261 #else
    00262
    00263
    00264
    00265 template<
    00266 class ObjectType,
    00267 #if defined(XALAN_NO_DEFAULT_TEMPLATE_ARGUMENTS)
    00268 class CreateFunctorType,
    00269 class DeleteFunctorType,
    00270 class ResetFunctorType>
    00271 #else
    00272 class CreateFunctorType = DefaultCacheCreateFunctor<ObjectType>,
    00273 class DeleteFunctorType = DeleteFunctor<ObjectType>,
    00274 class ResetFunctorType = DefaultCacheResetFunctor<ObjectType> >
    00275 #endif
    00276 class XalanObjectCache
    00277 {
    00278 public:
    00279
    00280 #if defined(XALAN_NO_STD_NAMESPACE)
    00281     typedef vector<ObjectType*>         VectorType;
    00282 #else
    00283     typedef std::vector<ObjectType*>    VectorType;
    00284 #endif
    00285
    00286     typedef ObjectType  CacheObjectType;
    00287
    00288     explicit
    00289     XalanObjectCache(unsigned int   initialListSize = 0) :
    00290         m_availableList()
    00291     {
    00292         m_availableList.reserve(initialListSize);
    00293     }
    00294
    00295     ~XalanObjectCache()
    00296     {
    00297         reset();
    00298
    00299 #if !defined(XALAN_NO_STD_NAMESPACE)
    00300         using std::for_each;
    00301 #endif
    00302
    00303         for_each(
    00304                 m_availableList.begin(),
    00305                 m_availableList.end(),
    00306                 m_deleteFunctor);
    00307     }
    00308
    00309     ObjectType*
    00310     get()
    00311     {
    00312         // We'll always return the back of the free list, since
    00313         // that's the cheapest thing.
    00314         if (m_availableList.empty() == true)
    00315         {
    00316             return m_createFunctor();
    00317         }
    00318         else
    00319         {
    00320             ObjectType* const   theObject = m_availableList.back();
    00321
    00322             m_availableList.pop_back();
    00323
    00324             return theObject;
    00325         }
    00326     }
    00327
    00328     bool
    00329     release(ObjectType*     theInstance)
    00330     {
    00331         m_resetFunctor(theInstance);
    00332
    00333         m_availableList.push_back(theInstance);
    00334
    00335         return true;
    00336     }
    00337
    00338     void
    00339     reset()
    00340     {
    00341     }
    00342
    00343     // Functors for various operations...
    00344     CreateFunctorType   m_createFunctor;
    00345
    00346     DeleteFunctorType   m_deleteFunctor;
    00347
    00348     ResetFunctorType    m_resetFunctor;
    00349
    00350 private:
    00351
    00352     // These are not defined...
    00353     XalanObjectCache(const XalanObjectCache<ObjectType, CreateFunctorType, DeleteFunctorType, ResetFunctorType>&    theRHS);
    00354
    00355     XalanObjectCache<ObjectType, CreateFunctorType, DeleteFunctorType, ResetFunctorType>&
    00356     operator=(const XalanObjectCache<ObjectType, CreateFunctorType, DeleteFunctorType, ResetFunctorType>&   theRHS);
    00357
    00358
    00359     // Data members...
    00360     VectorType          m_availableList;
    00361 };
    00362
    00363
    00364
    00365 #endif
    00366
    00367
    00368
    00369 template<class XalanObjectCacheType>
    00370 class GuardCachedObject
    00371 {
    00372 public:
    00373
    00374     typedef typename XalanObjectCacheType::CacheObjectType  CacheObjectType;
    00375
    00376     GuardCachedObject(XalanObjectCacheType& theCache) :
    00377         m_cache(theCache),
    00378         m_cachedObject(theCache.get())
    00379     {
    00380     }
    00381
    00382     ~GuardCachedObject()
    00383     {
    00384         if (m_cachedObject != 0)
    00385         {
    00386             m_cache.release(m_cachedObject);
    00387         }
    00388     }
    00389
    00390     CacheObjectType*
    00391     get() const
    00392     {
    00393         return m_cachedObject;
    00394     }
    00395
    00396     CacheObjectType*
    00397     release()
    00398     {
    00399         CacheObjectType* const  temp = m_cachedObject;
    00400
    00401         m_cachedObject = 0;
    00402
    00403         return temp;
    00404     }
    00405
    00406 private:
    00407
    00408     // Not implemented...
    00409     GuardCachedObject(const GuardCachedObject<XalanObjectCacheType>&);
    00410
    00411
    00412     // Data members...
    00413     XalanObjectCacheType&   m_cache;
    00414
    00415     CacheObjectType*        m_cachedObject;
    00416 };
    00417
    00418
    00419
    00420 template<class ObjectType>
    00421 class XalanObjectCacheDefault : public XalanObjectCache<ObjectType, DefaultCacheCreateFunctor<ObjectType>, DeleteFunctor<ObjectType>, DefaultCacheResetFunctor<ObjectType> >
    00422 {
    00423 public:
    00424
    00425     typedef XalanObjectCache<ObjectType, DefaultCacheCreateFunctor<ObjectType>, DeleteFunctor<ObjectType>, DefaultCacheResetFunctor<ObjectType> >       BaseClassType;
    00426
    00427     explicit
    00428     XalanObjectCacheDefault(unsigned int    initialListSize = 0) :
    00429         BaseClassType(initialListSize)
    00430     {
    00431     }
    00432 };
    00433
    00434
    00435
    00436 XALAN_CPP_NAMESPACE_END
    00437
    00438
    00439
    00440 #endif

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