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Remove unused json_batchallocator.h

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This commit is contained in:
Mike Ellery
2018-10-26 12:18:36 -07:00
committed by Nik Bougalis
parent 146ea5d44e
commit 202d91c9f0
1 changed files with 0 additions and 143 deletions
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143
src/ripple/json/impl/json_batchallocator.h
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@@ -1,143 +0,0 @@
//------------------------------------------------------------------------------
/*
This file is part of rippled: https://github.com/ripple/rippled
Copyright (c) 2012, 2013 Ripple Labs Inc.
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
#ifndef RIPPLE_JSON_JSON_BATCHALLOCATOR_H_INCLUDED
#define RIPPLE_JSON_JSON_BATCHALLOCATOR_H_INCLUDED
namespace Json
{
/* Fast memory allocator.
*
* This memory allocator allocates memory for a batch of object (specified by
* the page size, the number of object in each page).
*
* It does not allow the destruction of a single object. All the allocated objects
* can be destroyed at once. The memory can be either released or reused for future
* allocation.
*
* The in-place new operator must be used to construct the object using the pointer
* returned by allocate.
*/
template < typename AllocatedType
, const unsigned int objectPerAllocation >
class BatchAllocator
{
public:
using Type = AllocatedType;
BatchAllocator ( unsigned int objectsPerPage = 255 )
: 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_;
}
~BatchAllocator ()
{
for ( BatchInfo* batch = batches_; batch; )
{
BatchInfo* nextBatch = batch->next_;
free ( batch );
batch = nextBatch;
}
}
/// allocate space for an array of objectPerAllocation object.
/// @warning it is the responsability of the caller to call objects constructors.
AllocatedType* allocate ()
{
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;
}
/// Release the object.
/// @warning it is the responsability of the caller to actually destruct the object.
void release ( AllocatedType* object )
{
assert ( object != 0 );
* (AllocatedType**)object = freeHead_;
freeHead_ = object;
}
private:
struct BatchInfo
{
explicit BatchInfo() = default;
BatchInfo* next_;
AllocatedType* used_;
AllocatedType* end_;
AllocatedType buffer_[objectPerAllocation];
};
// disabled copy constructor and assignement operator.
BatchAllocator ( const BatchAllocator& );
void operator = ( const BatchAllocator&);
static BatchInfo* allocateBatch ( unsigned int objectsPerPage )
{
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;
}
BatchInfo* batches_;
BatchInfo* currentBatch_;
/// Head of a single linked list within the allocated space of freeed object
AllocatedType* freeHead_;
unsigned int objectsPerPage_;
};
} // namespace Json
#endif // JSONCPP_BATCHALLOCATOR_H_INCLUDED