Sirikata::Transfer::LRUPolicy Class Reference

Simple LRU policy--does not do any ordering by size. More...

#include <LRUPolicy.hpp>

Inheritance diagram for Sirikata::Transfer::LRUPolicy:

Collaboration diagram for Sirikata::Transfer::LRUPolicy:

List of all members.

Classes
struct	LRUData
Public Member Functions
	LRUPolicy (cache_usize_type allocatedSpace, float maxSizePct=0.5)
virtual void	use (const Fingerprint &id, Data *data, cache_usize_type size)
	Marks the entry as used.
virtual void	useAndUpdate (const Fingerprint &id, Data *data, cache_usize_type oldsize, cache_usize_type newsize)
	Marks the entry as used, and update the space usage.
virtual void	destroy (const Fingerprint &id, Data *data, cache_usize_type size)
	Deletes the opaque data (and anything other corresponding info)
virtual Data *	create (const Fingerprint &id, cache_usize_type size)
	Allocates opaque data (and anything other corresponding info) At this point, the allocation must not fail.
virtual bool	nextItem (cache_usize_type requiredSpace, Fingerprint &myprint)
Private Types
typedef Fingerprint	LRUElement
typedef std::list< LRUElement >	LRUList
Private Attributes
LRUList	mLeastUsed

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Detailed Description

Simple LRU policy--does not do any ordering by size.

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Member Typedef Documentation

typedef Fingerprint Sirikata::Transfer::LRUPolicy::LRUElement [private]

typedef std::list<LRUElement> Sirikata::Transfer::LRUPolicy::LRUList [private]

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Constructor & Destructor Documentation

Sirikata::Transfer::LRUPolicy::LRUPolicy	(	cache_usize_type	allocatedSpace,
		float	maxSizePct = 0.5
	)		[inline]

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Member Function Documentation

virtual Data* Sirikata::Transfer::LRUPolicy::create	(	const Fingerprint &	id,
		cache_usize_type	size
	)		[inline, virtual]

Allocates opaque data (and anything other corresponding info) At this point, the allocation must not fail.

It is up to the CacheLayer to respect the decision from allocateSpace().

Parameters:

id	The FileId corresponding to the data.
size	The amount of space allocated (should be the same as was earlier passed to allocateSpace).

Returns:

The corresponding opaque data.

Implements Sirikata::Transfer::CachePolicy.

References mLeastUsed, and Sirikata::Transfer::CachePolicy::updateSpace().

virtual void Sirikata::Transfer::LRUPolicy::destroy	(	const Fingerprint &	id,
		Data *	data,
		cache_usize_type	size
	)		[inline, virtual]

Deletes the opaque data (and anything other corresponding info)

Parameters:

id	The FileId corresponding to the data.
data	The opaque data corresponding to this policy.
size	The size of the file data.

Implements Sirikata::Transfer::CachePolicy.

References Sirikata::Logging::detailed, Sirikata::Transfer::CachePolicy::mFreeSpace, Sirikata::Transfer::LRUPolicy::LRUData::mIter, mLeastUsed, SILOG, and Sirikata::Transfer::CachePolicy::updateSpace().

virtual bool Sirikata::Transfer::LRUPolicy::nextItem	(	cache_usize_type	requiredSpace,
		Fingerprint &	myprint
	)		[inline, virtual]

Implements Sirikata::Transfer::CachePolicy.

References Sirikata::Transfer::CachePolicy::mFreeSpace, and mLeastUsed.

virtual void Sirikata::Transfer::LRUPolicy::use	(	const Fingerprint &	id,
		Data *	data,
		cache_usize_type	size
	)		[inline, virtual]

Marks the entry as used.

Parameters:

id	The FileId corresponding to the data.
data	The opaque data corresponding to this policy.
size	The size of the file data.

Implements Sirikata::Transfer::CachePolicy.

References Sirikata::Transfer::LRUPolicy::LRUData::mIter, and mLeastUsed.

Referenced by useAndUpdate().

virtual void Sirikata::Transfer::LRUPolicy::useAndUpdate	(	const Fingerprint &	id,
		Data *	data,
		cache_usize_type	oldsize,
		cache_usize_type	newsize
	)		[inline, virtual]

Marks the entry as used, and update the space usage.

Parameters:

id	The FileId corresponding to the data.
data	The opaque data corresponding to this policy.
oldsize	The previous size of the data.
newsize	The new size of the data.

Implements Sirikata::Transfer::CachePolicy.

References Sirikata::Transfer::CachePolicy::updateSpace(), and use().

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Member Data Documentation

LRUList Sirikata::Transfer::LRUPolicy::mLeastUsed [private]

Referenced by create(), destroy(), nextItem(), and use().

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The documentation for this class was generated from the following file:

• libcore/include/sirikata/core/transfer/LRUPolicy.hpp