The memento pattern is a software design pattern that exposes the private internal state of an object.
One example of how this can be used is to restore an object to its previous state (undo via rollback), another is versioning, another is custom serialization.
The memento pattern is implemented with three objects: the originator, a caretaker and a memento. The originator is some object that has an internal state. The caretaker is going to do something to the originator, but wants to be able to undo the change. The caretaker first asks the originator for a memento object. Then it does whatever operation (or sequence of operations) it was going to do. To roll back to the state before the operations, it returns the memento object to the originator. The memento object itself is an opaque object (one which the caretaker cannot, or should not, change). When using this pattern, care should be taken if the originator may change other objects or resources—the memento pattern operates on a single object.
Classic examples of the memento pattern include a pseudorandom number generator (each consumer of the PRNG serves as a caretaker who can initialize the PRNG (the originator) with the same seed (the memento) to produce an identical sequence of pseudorandom numbers) and the state in a finite state machine.
The mementopattern is a software design pattern that exposes the private internal state of an object. One example of how this can be used is to restore...
through different patterns. The most common patterns are command pattern and mementopattern. The command pattern is a software design pattern which encapsulates...
underlying representation Mediator pattern Provides a unified interface to a set of interfaces in a subsystem Mementopattern Provides the ability to restore...
In software engineering, a design pattern describes a relatively small, well-defined aspect (i.e. functionality) of a computer program in terms of how...
their methods. Memento provides the ability to restore an object to its previous state (undo). Observer is a publish/subscribe pattern, which allows a...
December 18, 2017. Radiant sources (Memento from December 20, 2009 in the Internet Archive) Radioactivity (archived) (Memento from December 8, 2009 in the Internet...
The Promised Land Christy Ann Conlin novelist, short stories Heave, The Memento, Watermark Jan Conn 1952 poet, insect geneticist South of the Tudo Bem...
additional lace segment is also at Mount Vernon. Lace adorning a man's Masonic "Memento mori" apron is also an Ipswich lace. The Museum of Old Newbury at The Cushing...
tank". The title refers to the Utopian Arcadia of poetry and art, and the memento mori Latin phrase Et in Arcadia ego which recurs in Hamilton Finlay's work...
on 7 July 2023 as the third single from their fifteenth studio album, Memento Mori. It is the fourth track that Dave Gahan and Martin Gore collaborated...
context. Memento is a name for prior versions of web pages coined by the Memento Project. The UK Web Archive Memento interface allows Mementos to be found...
of the British Royal Family by King Edward VII. The order is a personal memento rather than a state decoration. The ribbon of Edward VII's Royal Family...
Craniometry Crystal skull Head and neck anatomy Human skull symbolism Memento mori Plagiocephaly, the abnormal flattening of one side of the skull Skull...
lace made from human hair, point tresse, was once popular as a personal memento. Elements of bobbin lace may include toile or toilé (clothwork), réseau...
in other ways where the narrative does not follow the direct causality pattern of the events featured, such as parallel distinctive plot lines, dream...
Death holding up a mirror to a woman. The prevailing theme of this is memento mori or "remember that life is brief". Picasso also combined the elements...
INZO, Forget the Money by Nick Bateman, The Parable by The Contortionist, Memento Mori by Architects, and Sunrise by Our Last Night. The 2017 video game...
Sifrit" January 27, 2008 (2008-01-27) Discover how a selection of hidden mementos exposed a happily married businesswoman as the cold-blooded killer of a...
contains a cipher of this type which deciphers to "Remember death" (cf. "memento mori"). George Washington's army had documentation about the system, with...
for her next True Crime, but leaves Todd with a set of lockpicks as a memento. 7 7 "Long Lost Lawrence" Daniella Eisman Scott Prendergast & Stefanie...
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