Distributed caching utility. More...

#include <dist_cache.h>

Collaboration diagram for madness::detail::DistCache< keyT >:

Classes
class	Cache
	Cache interface class. More...
class	CacheData
	Cache value container. More...

Static Public Member Functions
template<typename valueT>
static madness::Future< valueT >	get_cache_value (const keyT &key)
	Get the cache value accosted with `key`.
template<typename valueT>
static void	get_cache_value (const keyT &key, madness::Future< valueT > &value)
	Get the cache value accosted with `key`.
template<typename valueT>
static void	set_cache_value (const keyT &key, const valueT &value)
	Set the cache value accosted with `key`.

Private Types
typedef madness::ConcurrentHashMap< keyT, Cache * >	cache_container
	The container that holds cache values.
typedef cache_container::datumT	datum_type
	Cache container datum type.

Static Private Attributes
static cache_container	caches_
	Cache container.

Detailed Description

template<typename keyT>
class madness::detail::DistCache< keyT >

Distributed caching utility.

This object implements a local, key-value caching mechanism that can be used by remote tasks or active messages to move data between processes without synchronization. Because cache values are retrieved via a Future, you can get or set the cache in any order. The first call get_cache_value or set_cache_value or will insert the cache element, and the second call to these functions will remove it. Therefore, set_cache_value and get_cache_value can only be called once each per cache value.

Template Parameters

keyT	The key type of the cache

Member Typedef Documentation

◆ cache_container

template<typename keyT>

typedef madness::ConcurrentHashMap<keyT, Cache*> madness::detail::DistCache< keyT >::cache_container

private

The container that holds cache values.

◆ datum_type

template<typename keyT>

typedef cache_container::datumT madness::detail::DistCache< keyT >::datum_type

private

Cache container datum type.

Member Function Documentation

◆ get_cache_value() [1/2]

template<typename keyT>

template<typename valueT>

madness::Future< valueT > madness::detail::DistCache< keyT >::get_cache_value ( const keyT & key )

inlinestatic

Get the cache value accosted with key.

This will get the value associated with key to value. If the cache element does not exist, it is inserted into the cache. Otherwise, it is removed from the cache.

Template Parameters

valueT The object type that will be used to set the cache

Parameters

[in] key The key associated with value

Returns: A Future that holds/will hold the cache value, which will be set by a call to set_cache_value.

References madness::cache, caches_, madness::Future< void >::value, and madness::Hash_private::HashAccessor< hashT, lockmode >::release().

◆ get_cache_value() [2/2]

template<typename keyT>

template<typename valueT>

void madness::detail::DistCache< keyT >::get_cache_value	(	const keyT &	key,
		madness::Future< valueT > &	value )

inlinestatic

Get the cache value accosted with key.

This will get the value associated with key to value. The value is given in the form of a Future, which is set by a call to set_cache_value. If the cache element does not exist, it is inserted into the cache. Otherwise, it is removed from the cache.

Template Parameters

valueT The object type that will be used to set the cache

Parameters

[in]	key	The key associated with `value`
[out]	value	The data that will be cached

References madness::cache, caches_, madness::Future< void >::value, and madness::Hash_private::HashAccessor< hashT, lockmode >::release().

Referenced by madness::WorldGopInterface::bcast_internal(), and madness::WorldGopInterface::bcast_internal().

◆ set_cache_value()

template<typename keyT>

template<typename valueT>

void madness::detail::DistCache< keyT >::set_cache_value	(	const keyT &	key,
		const valueT &	value )

inlinestatic

Set the cache value accosted with key.

This will set the value associated with key to value. If the cache element does not exist, it is inserted into the cache. Otherwise, it is removed from the cache.

Template Parameters

valueT The object type that will be used to set the cache (may be a madness::Future type).

Parameters