panda3d.core.AdaptiveLruPage

from panda3d.core import AdaptiveLruPage
class AdaptiveLruPage

Bases: AdaptiveLruPageDynamicList, AdaptiveLruPageStaticList

One atomic piece that may be managed by a AdaptiveLru chain. To use this class, inherit from it and override evictLru().

This class multiply inherits from two classes which in turn both inherit from LinkedListNode. This is just a sneaky C++ trick to allow this class to inherit from LinkedListNode twice, so that pages can be stored on two different linked lists simultaneously. The AdaptiveLru class depends on this; it maintains its pages in two different lists, one grouped by priority, and one in order by next partial update needs.

Inheritance diagram

Inheritance diagram of AdaptiveLruPage

__init__(copy: AdaptiveLruPage) → None
__init__(lru_size: size_t) → None
assign(copy: AdaptiveLruPage) → AdaptiveLruPage
Return type

AdaptiveLruPage

getLru() → AdaptiveLru

Returns the LRU that manages this page, or NULL if it is not currently managed by any LRU.

Return type

AdaptiveLru

enqueueLru(lru: AdaptiveLru) → None

Adds the page to the LRU for the first time, or marks it recently-accessed if it has already been added.

If lru is NULL, it means to remove this page from its LRU.

dequeueLru() → None

Removes the page from its AdaptiveLru.

markUsedLru() → None

To be called when the page is used; this will move it to the tail of the AdaptiveLru queue it is already on.

This method is const because it’s not technically modifying the contents of the page itself.

markUsedLru(lru: AdaptiveLru) → None

To be called when the page is used; this will move it to the tail of the specified AdaptiveLru queue.

getLruSize() → size_t

Returns the size of this page as reported to the LRU, presumably in bytes.

Return type

size_t

setLruSize(lru_size: size_t) → None

Specifies the size of this page, presumably in bytes, although any unit is possible.

evictLru() → None

Evicts the page from the LRU. Called internally when the LRU determines that it is full. May also be called externally when necessary to explicitly evict the page.

It is legal for this method to either evict the page as requested, do nothing (in which case the eviction will be requested again at the next epoch), or requeue itself on the tail of the queue (in which case the eviction will be requested again much later).

output(out: ostream) → None
write(out: ostream, indent_level: int) → None
getNumFrames() → int

Returns the number of frames since the page was first added to its LRU. Returns 0 if it does not have an LRU.

getNumInactiveFrames() → int

Returns the number of frames since the page was last accessed on its LRU. Returns 0 if it does not have an LRU.