Sirikata::Transfer::MemoryCacheLayer Class Reference

MemoryCacheLayer is usually the first layer in the cache--simple map from FileId to SparseData. More...

#include <MemoryCacheLayer.hpp>

Inheritance diagram for Sirikata::Transfer::MemoryCacheLayer:

Collaboration diagram for Sirikata::Transfer::MemoryCacheLayer:

List of all members.

Classes
struct	CacheData
Public Member Functions
	MemoryCacheLayer (CachePolicy *policy, CacheLayer *tryNext)
virtual void	purgeFromCache (const Fingerprint &fileId)
	Purges this hash from all subsequent caches.
virtual void	getData (const Fingerprint &fileId, const Range &requestedRange, const TransferCallback &callback)
	Query this cache layer.
Protected Member Functions
virtual void	populateCache (const Fingerprint &fileId, const DenseDataPtr &respondData)
	Goes up the heirararchy of cache layers filling in data.
virtual void	destroyCacheEntry (const Fingerprint &fileId, CacheEntry *cacheLayerData, cache_usize_type releaseSize)
	Called after a cache entry has been destroyed-- Does not remove the item from other caches in the chain.
Private Types
typedef CacheMap	MemoryMap
Private Attributes
MemoryMap	mData

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Detailed Description

MemoryCacheLayer is usually the first layer in the cache--simple map from FileId to SparseData.

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Member Typedef Documentation

typedef CacheMap Sirikata::Transfer::MemoryCacheLayer::MemoryMap [private]

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Constructor & Destructor Documentation

Sirikata::Transfer::MemoryCacheLayer::MemoryCacheLayer	(	CachePolicy *	policy,
		CacheLayer *	tryNext
	)		[inline]

References mData, and Sirikata::Transfer::CacheMap::setOwner().

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Member Function Documentation

virtual void Sirikata::Transfer::MemoryCacheLayer::destroyCacheEntry	(	const Fingerprint &	fileId,
		CacheEntry *	cacheLayerData,
		cache_usize_type	releaseSize
	)		[inline, protected, virtual]

Called after a cache entry has been destroyed-- Does not remove the item from other caches in the chain.

Should be called only from CacheMap.

Reimplemented from Sirikata::Transfer::CacheLayer.

virtual void Sirikata::Transfer::MemoryCacheLayer::getData	(	const Fingerprint &	fileId,
		const Range &	requestedRange,
		const TransferCallback &	callback
	)		[inline, virtual]

Query this cache layer.

If successful, call callback with the data and also call populateCache in order to populate the previous cache levels.

Parameters:

fid	A unique identifier corresponding to the file (contains a hash).
requestedRange	A Range object specifying a single range that you need.
callback	To be called with the data if successful, or NULL if failed.

Returns:

false, if the callback happened synchronously (i.e. in memory cache)

Reimplemented from Sirikata::Transfer::CacheLayer.

References Sirikata::Transfer::DenseDataList::contains(), Sirikata::Logging::detailed, Sirikata::Transfer::CacheMap::read_iterator::find(), mData, Sirikata::Transfer::MemoryCacheLayer::CacheData::mSparse, Sirikata::Transfer::CacheLayer::populateParentCaches(), Sirikata::Transfer::Range::printRangeList(), SILOG, and SILOGP.

virtual void Sirikata::Transfer::MemoryCacheLayer::populateCache	(	const Fingerprint &	fileId,
		const DenseDataPtr &	data
	)		[inline, protected, virtual]

Goes up the heirararchy of cache layers filling in data.

Parameters:

fileId	the Fingerprint to store this data in CacheMap.
data	Data to be stored in this CacheLayer.

Reimplemented from Sirikata::Transfer::CacheLayer.

References Sirikata::Transfer::DenseDataList::addValidData(), Sirikata::Transfer::CacheMap::alloc(), Sirikata::Logging::detailed, Sirikata::Transfer::DenseDataList::getSpaceUsed(), Sirikata::Transfer::CacheMap::write_iterator::insert(), mData, Sirikata::Transfer::MemoryCacheLayer::CacheData::mSparse, Sirikata::Transfer::CacheLayer::populateParentCaches(), Sirikata::Transfer::Range::printRangeList(), SILOG, SILOGP, Sirikata::Transfer::CacheMap::write_iterator::update(), and Sirikata::Transfer::CacheMap::write_iterator::use().

virtual void Sirikata::Transfer::MemoryCacheLayer::purgeFromCache

(

const Fingerprint &

fileId

)

[inline, virtual]

Purges this hash from all subsequent caches.

In general, it is not useful to do this manually, since the CachePolicy handles freeing extra data, and it is usually assumed that the cache is correct.

Validity checking should probably be added elsewhere--though it is not really feasable for incomplete downloads if we used a range.

Reimplemented from Sirikata::Transfer::CacheLayer.

References Sirikata::Transfer::CacheMap::write_iterator::erase(), Sirikata::Transfer::CacheMap::write_iterator::find(), and mData.

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Member Data Documentation

MemoryMap Sirikata::Transfer::MemoryCacheLayer::mData [private]

Referenced by getData(), MemoryCacheLayer(), populateCache(), and purgeFromCache().

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

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