| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #if !defined(ARENAALLOCATOR_INCLUDE_GUARD_1357924680) |
| #define ARENAALLOCATOR_INCLUDE_GUARD_1357924680 |
| |
| |
| |
| #include <algorithm> |
| |
| |
| |
| #include <xalanc/Include/STLHelper.hpp> |
| #include <xalanc/Include/XalanList.hpp> |
| |
| |
| |
| #include "ArenaBlock.hpp" |
| |
| |
| |
| namespace XALAN_CPP_NAMESPACE { |
| |
| |
| |
| template<class ObjectType, |
| #if defined(XALAN_NO_DEFAULT_TEMPLATE_ARGUMENTS) |
| class ArenaBlockType> |
| #else |
| class ArenaBlockType = ArenaBlock<ObjectType> > |
| #endif |
| class ArenaAllocator |
| { |
| public: |
| |
| typedef ArenaAllocator<ObjectType, ArenaBlockType> ThisType; |
| |
| typedef XalanList<ArenaBlockType*> ArenaBlockListType; |
| |
| typedef typename ArenaBlockType::size_type size_type; |
| |
| /* |
| * Construct an instance that will allocate blocks of the specified size. |
| * |
| * @param theBlockSize The block size. |
| */ |
| ArenaAllocator( |
| MemoryManager& theManager, |
| size_type theBlockSize) : |
| m_blockSize(theBlockSize), |
| m_blocks(theManager) |
| { |
| } |
| |
| virtual |
| ~ArenaAllocator() |
| { |
| reset(); |
| } |
| |
| MemoryManager& |
| getMemoryManager() |
| { |
| return m_blocks.getMemoryManager(); |
| } |
| |
| const MemoryManager& |
| getMemoryManager() const |
| { |
| return m_blocks.getMemoryManager(); |
| } |
| |
| /* |
| * Get size of an ArenaBlock, that is, the number |
| * of objects in each block. |
| * |
| * @return The size of the block |
| */ |
| size_type |
| getBlockSize() const |
| { |
| return m_blockSize; |
| } |
| |
| /* |
| * Set size of an ArenaBlock, that is, the number |
| * of objects in each block. Only affects blocks |
| * allocated after the call. |
| * |
| * @param theSize The size of the block |
| */ |
| void |
| setBlockSize(size_type theSize) |
| { |
| m_blockSize = theSize; |
| } |
| |
| /* |
| * Get the number of ArenaBlocks currently allocated. |
| * |
| * @return The number of blocks. |
| */ |
| size_type |
| getBlockCount() const |
| { |
| return (size_type)m_blocks.size(); |
| } |
| |
| /* |
| * Allocate a block of the appropriate size for an |
| * object. Call commitAllocation() when after |
| * the object is successfully constructed. |
| * |
| * @return A pointer to a block of memory |
| */ |
| virtual ObjectType* |
| allocateBlock() |
| { |
| if (m_blocks.empty() == true || |
| m_blocks.back()->blockAvailable() == false) |
| { |
| m_blocks.push_back( |
| ArenaBlockType::create( |
| getMemoryManager(), |
| m_blockSize)); |
| } |
| assert( |
| m_blocks.empty() == false && |
| m_blocks.back() != 0 && |
| m_blocks.back()->blockAvailable() == true); |
| |
| return m_blocks.back()->allocateBlock(); |
| } |
| |
| /* |
| * Commits the allocation of the previous |
| * allocateBlock() call. |
| * |
| * @param theObject A pointer to a block of memory |
| */ |
| virtual void |
| commitAllocation(ObjectType* theObject) |
| { |
| assert( |
| m_blocks.empty() == false && |
| m_blocks.back()->ownsBlock(theObject) == true); |
| |
| m_blocks.back()->commitAllocation(theObject); |
| |
| assert(m_blocks.back()->ownsObject(theObject) == true); |
| } |
| |
| virtual bool |
| ownsObject(const ObjectType* theObject) const |
| { |
| bool fResult = false; |
| |
| typedef typename ArenaBlockListType::const_reverse_iterator const_reverse_iterator; |
| |
| // Search back for a block that may have allocated the object... |
| const const_reverse_iterator theEnd = this->m_blocks.rend(); |
| |
| const_reverse_iterator i = this->m_blocks.rbegin(); |
| |
| while(i != theEnd) |
| { |
| assert(*i != 0); |
| |
| if ((*i)->ownsObject(theObject) == true) |
| { |
| fResult = true; |
| |
| break; |
| } |
| else |
| { |
| ++i; |
| } |
| } |
| |
| return fResult; |
| } |
| |
| virtual void |
| reset() |
| { |
| std::for_each( |
| m_blocks.begin(), |
| m_blocks.end(), |
| DeleteFunctor<ArenaBlockType>(m_blocks.getMemoryManager())); |
| |
| m_blocks.clear(); |
| } |
| |
| protected: |
| |
| // data members... |
| size_type m_blockSize; |
| |
| ArenaBlockListType m_blocks; |
| |
| private: |
| |
| // Not defined... |
| ArenaAllocator(const ArenaAllocator<ObjectType, ArenaBlockType>&); |
| |
| ArenaAllocator<ObjectType, ArenaBlockType>& |
| operator=(const ArenaAllocator<ObjectType, ArenaBlockType>&); |
| |
| bool |
| operator==(const ArenaAllocator<ObjectType, ArenaBlockType>&) const; |
| }; |
| |
| |
| |
| } |
| |
| |
| |
| #endif // !defined(ARENAALLOCATOR_INCLUDE_GUARD_1357924680) |