Json::BatchAllocator< AllocatedType, objectPerAllocation > Class Template Reference

#include <json_batchallocator.h>

Classes
struct	BatchInfo

Public Types
typedef AllocatedType	Type

Public Member Functions
AllocatedType *	allocate ()
	BatchAllocator (unsigned int objectsPerPage=255)
	BatchAllocator (const BatchAllocator &)=delete
void	operator= (const BatchAllocator &)=delete
void	release (AllocatedType *object)
	~BatchAllocator ()

Static Private Member Functions
static BatchInfo *	allocateBatch (unsigned int objectsPerPage)

Private Attributes
BatchInfo *	batches_
BatchInfo *	currentBatch_
AllocatedType *	freeHead_
	Head of a single linked list within the allocated space of freeed object. More...
unsigned int	objectsPerPage_

Detailed Description

template<typename AllocatedType, const unsigned int objectPerAllocation>
class Json::BatchAllocator< AllocatedType, objectPerAllocation >

Definition at line 24 of file json_batchallocator.h.

Member Typedef Documentation

template<typename AllocatedType , const unsigned int objectPerAllocation>

typedef AllocatedType Json::BatchAllocator< AllocatedType, objectPerAllocation >::Type

Definition at line 26 of file json_batchallocator.h.

Constructor & Destructor Documentation

template<typename AllocatedType , const unsigned int objectPerAllocation>

Json::BatchAllocator< AllocatedType, objectPerAllocation >::BatchAllocator ( unsigned int  objectsPerPage = 255 )

inline

Definition at line 28 of file json_batchallocator.h.

References Json::BatchAllocator< AllocatedType, objectPerAllocation >::allocateBatch(), Json::BatchAllocator< AllocatedType, objectPerAllocation >::batches_, and Json::BatchAllocator< AllocatedType, objectPerAllocation >::currentBatch_.

Referenced by Json::BatchAllocator< AllocatedType, objectPerAllocation >::release().

                                                      : freeHead_(0), objectsPerPage_(objectsPerPage) {
      //      printf( "Size: %d => %s\n", sizeof(AllocatedType), typeid(AllocatedType).name() );
      assert(sizeof(AllocatedType) * objectPerAllocation >=
             sizeof(AllocatedType *));  // We must be able to store a slist in the object free space.
      assert(objectsPerPage >= 16);
      batches_ = allocateBatch(0);  // allocated a dummy page
      currentBatch_ = batches_;
    }

template<typename AllocatedType , const unsigned int objectPerAllocation>

Json::BatchAllocator< AllocatedType, objectPerAllocation >::~BatchAllocator ( )

inline

Definition at line 37 of file json_batchallocator.h.

References photonOfflineClient_cfi::batch, and Json::BatchAllocator< AllocatedType, objectPerAllocation >::batches_.

                      {
      for (BatchInfo *batch = batches_; batch;) {
        BatchInfo *nextBatch = batch->next_;
        free(batch);
        batch = nextBatch;
      }
    }

template<typename AllocatedType , const unsigned int objectPerAllocation>

Json::BatchAllocator< AllocatedType, objectPerAllocation >::BatchAllocator ( const BatchAllocator< AllocatedType, objectPerAllocation > &  )

delete

Member Function Documentation

template<typename AllocatedType , const unsigned int objectPerAllocation>

AllocatedType* Json::BatchAllocator< AllocatedType, objectPerAllocation >::allocate ( )

inline

allocate space for an array of objectPerAllocation object.

Warning

it is the responsability of the caller to call objects constructors.

Definition at line 47 of file json_batchallocator.h.

References Json::BatchAllocator< AllocatedType, objectPerAllocation >::allocateBatch(), Json::BatchAllocator< AllocatedType, objectPerAllocation >::batches_, Json::BatchAllocator< AllocatedType, objectPerAllocation >::currentBatch_, Json::BatchAllocator< AllocatedType, objectPerAllocation >::BatchInfo::end_, Json::BatchAllocator< AllocatedType, objectPerAllocation >::freeHead_, Json::BatchAllocator< AllocatedType, objectPerAllocation >::BatchInfo::next_, resolutioncreator_cfi::object, Json::BatchAllocator< AllocatedType, objectPerAllocation >::objectsPerPage_, and Json::BatchAllocator< AllocatedType, objectPerAllocation >::BatchInfo::used_.

                              {
      if (freeHead_)  // returns node from free list.
      {
        AllocatedType *object = freeHead_;
        freeHead_ = *(AllocatedType **)object;
        return object;
      }
      if (currentBatch_->used_ == currentBatch_->end_) {
        currentBatch_ = currentBatch_->next_;
        while (currentBatch_ && currentBatch_->used_ == currentBatch_->end_)
          currentBatch_ = currentBatch_->next_;

        if (!currentBatch_)  // no free batch found, allocate a new one
        {
          currentBatch_ = allocateBatch(objectsPerPage_);
          currentBatch_->next_ = batches_;  // insert at the head of the list
          batches_ = currentBatch_;
        }
      }
      AllocatedType *allocated = currentBatch_->used_;
      currentBatch_->used_ += objectPerAllocation;
      return allocated;
    }

template<typename AllocatedType , const unsigned int objectPerAllocation>

static BatchInfo* Json::BatchAllocator< AllocatedType, objectPerAllocation >::allocateBatch ( unsigned int  objectsPerPage )

inlinestaticprivate

Definition at line 91 of file json_batchallocator.h.

References photonOfflineClient_cfi::batch, Json::BatchAllocator< AllocatedType, objectPerAllocation >::BatchInfo::next_, and Json::BatchAllocator< AllocatedType, objectPerAllocation >::BatchInfo::used_.

Referenced by Json::BatchAllocator< AllocatedType, objectPerAllocation >::allocate(), and Json::BatchAllocator< AllocatedType, objectPerAllocation >::BatchAllocator().

                                                                 {
      const unsigned int mallocSize = sizeof(BatchInfo) - sizeof(AllocatedType) * objectPerAllocation +
                                      sizeof(AllocatedType) * objectPerAllocation * objectsPerPage;
      BatchInfo *batch = static_cast<BatchInfo *>(malloc(mallocSize));
      batch->next_ = 0;
      batch->used_ = batch->buffer_;
      batch->end_ = batch->buffer_ + objectsPerPage;
      return batch;
    }

template<typename AllocatedType , const unsigned int objectPerAllocation>

void Json::BatchAllocator< AllocatedType, objectPerAllocation >::operator= ( const BatchAllocator< AllocatedType, objectPerAllocation > &  )

delete

Referenced by Json::BatchAllocator< AllocatedType, objectPerAllocation >::release().

template<typename AllocatedType , const unsigned int objectPerAllocation>

void Json::BatchAllocator< AllocatedType, objectPerAllocation >::release ( AllocatedType *  object )

inline

Release the object.

Warning

it is the responsability of the caller to actually destruct the object.

Definition at line 73 of file json_batchallocator.h.

References Json::BatchAllocator< AllocatedType, objectPerAllocation >::BatchAllocator(), Json::BatchAllocator< AllocatedType, objectPerAllocation >::freeHead_, resolutioncreator_cfi::object, and Json::BatchAllocator< AllocatedType, objectPerAllocation >::operator=().

                                        {
      assert(object != 0);
      *(AllocatedType **)object = freeHead_;
      freeHead_ = object;
    }

Member Data Documentation

template<typename AllocatedType , const unsigned int objectPerAllocation>

BatchInfo* Json::BatchAllocator< AllocatedType, objectPerAllocation >::batches_

private

Definition at line 101 of file json_batchallocator.h.

Referenced by Json::BatchAllocator< AllocatedType, objectPerAllocation >::allocate(), Json::BatchAllocator< AllocatedType, objectPerAllocation >::BatchAllocator(), and Json::BatchAllocator< AllocatedType, objectPerAllocation >::~BatchAllocator().

template<typename AllocatedType , const unsigned int objectPerAllocation>

BatchInfo* Json::BatchAllocator< AllocatedType, objectPerAllocation >::currentBatch_

private

Definition at line 102 of file json_batchallocator.h.

Referenced by Json::BatchAllocator< AllocatedType, objectPerAllocation >::allocate(), and Json::BatchAllocator< AllocatedType, objectPerAllocation >::BatchAllocator().

template<typename AllocatedType , const unsigned int objectPerAllocation>

AllocatedType* Json::BatchAllocator< AllocatedType, objectPerAllocation >::freeHead_

private

Head of a single linked list within the allocated space of freeed object.

Definition at line 104 of file json_batchallocator.h.

Referenced by Json::BatchAllocator< AllocatedType, objectPerAllocation >::allocate(), and Json::BatchAllocator< AllocatedType, objectPerAllocation >::release().

template<typename AllocatedType , const unsigned int objectPerAllocation>

unsigned int Json::BatchAllocator< AllocatedType, objectPerAllocation >::objectsPerPage_

private

Definition at line 105 of file json_batchallocator.h.

Referenced by Json::BatchAllocator< AllocatedType, objectPerAllocation >::allocate().