Search results
Results from the WOW.Com Content Network
There are multiple ways to implement the flyweight pattern. One example is mutability: whether the objects storing extrinsic flyweight state can change. Immutable objects are easily shared, but require creating new extrinsic objects whenever a change in state occurs. In contrast, mutable objects can share state.
Extensibility pattern: a.k.a. Framework - hide complex code behind a simple interface; Facade pattern: create a simplified interface of an existing interface to ease usage for common tasks; Flyweight pattern: a large quantity of objects share a common properties object to save space; Marker pattern: an empty interface to associate metadata with ...
The object pool design pattern is used in several places in the standard classes of the .NET Framework. One example is the .NET Framework Data Provider for SQL Server. As SQL Server database connections can be slow to create, a pool of connections is maintained. Closing a connection does not actually relinquish the link to SQL Server.
Design Patterns: Elements of Reusable Object-Oriented Software (1994) is a software engineering book describing software design patterns. The book was written by Erich Gamma , Richard Helm , Ralph Johnson , and John Vlissides , with a foreword by Grady Booch .
Flyweight pattern – an object programming design pattern, that also uses a kind of memoization; Hashlife – a memoizing technique to speed up the computation of cellular automata; Lazy evaluation – shares some concepts with memoization; Materialized view – analogous caching in database queries
Decoration is also often used in the Flyweight design pattern. Flyweight objects are divided into two components: an invariant component that is shared between all flyweight objects; and a variant, decorated component that may be partially shared or completely unshared. This partitioning of the flyweight object is intended to reduce memory ...
The Python example seems to be based on an incorrect understanding of the pattern. It's simply inserting and retrieving from a shared dictionary, but a shared dictionary by itself is not a flyweight pattern. Besides it seems to be largely original research and contains a large off-topic discussion of immutability in Python's data model.
Some examples of creational design patterns include: Abstract Factory pattern : a class requests the objects it requires from a factory object instead of creating the objects directly Factory method pattern : centralize creation of an object of a specific type choosing one of several implementations