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Topic: Flyweight pattern

Related Topics

State pattern

Facade pattern

Strategy pattern

Composite pattern

Builder pattern

Abstract factory pattern

Singleton pattern

Prototype pattern

Factory method pattern

Mediator pattern

Visitor pattern

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	Design Pattern Synopses
		The Filter pattern is a special case of the Decorator pattern, where a data source or data sink object is wrapped to add logic to the handling of a data stream.
		The Composite pattern also allows the objects in the tree to be manipulated in a consistent manner, by requiring all of the objects in the tree to have a common superclass or interface.
		The Flyweight pattern is often combined with the Composite pattern to represent the leaf nodes of a hierarchical structure with shared objects.
	www.mindspring.com /~mgrand/pattern_synopses.htm (4381 words)

	Flyweight
		The Flyweight pattern describes how to share objects to allow their use at fine granularities without prohibitive cost.
		Flyweight suggests removing the // non-shareable state from the class, and having // the client supply it when methods are called.
		Flyweight is often combined with Composite to implement shared leaf nodes.
	home.earthlink.net /~huston2/dp/flyweight.html (660 words)

	Flyweight Pattern Discussion
		Flyweight is a fairly complex pattern with several parts.
		It is sort of like the StrategyPattern, where the original object is broken into the strategy and the context, and the context has to be passed into the strategy for the strategy to work.
		A flyweight is broken into an intrinsic part and the extrinsic part.
	c2.com /cgi/wiki?FlyweightPatternDiscussion (770 words)

	Flyweight
		State, which allows an object to alter its behavior when its internal state is changed, whereas a flyweight is best implemented on it.
		The composite pattern may be combined to define the flyweight system.
		Flyweight design is effective with instantiating a large amount of small and fine-grained classes by combining with factory design pattern.
	www.javacamp.org /designPattern/flyweight.html (1008 words)

	Flyweight pattern - Wikipedia, the free encyclopedia
		In the flyweight pattern, the data has no pointers to the data type methods, because these would consume too much space.
		In some cases, flyweight inheritance is performed by "shift-in" and "shift-out" data markers as a higher-level operation cycles through an array of flyweight data.
		One classic example of a flyweight pattern are the characters stored in a word processor.
	en.wikipedia.org /wiki/Flyweight_pattern (383 words)

	More runtime flexibility and future proofing; GOF Structural Patterns with C# - by Barry Mossman (Site not responding. Last check: 2007-11-03)
		A focus of the pattern is to simplify the client by allowing it operate, with generic code, upon the whole tree, a branch from the tree, or just a single leaf.
		The Flyweight pattern is designed for situations where we would like to use objects in our system design, but are concerned about doing so because a very large quantity of these objects will be required at runtime.
		The pattern allows the most memory saving where there is either a large quantity of intrinsic data associated with each instance, or where the actual data at runtime allows a lot of sharing to occur.
	dn.codegear.com /article/32383 (8279 words)

	Design Pattern Synopses from Patterns in Java, Volume 1 Second Edition
		The Decorator pattern extends the functionality of an object in a way that is transparent to its clients, by implementing the same interface as the original class and delegating operations to the original class.
		The Guarded Suspension pattern is used in the implementation of the Double Buffering pattern to coordinate the actions of data-requesting threads with the read-ahead thread.
		The two phase termination pattern may be used in the implementation of the Double Buffering pattern to shut down the read-ahead thread in an orderly way.
	www.markgrand.com /pattern_synopses1_2ed.html (5418 words)

	Enterprise Java Community: Enhancing Web Application Performance with Caching
		The Flyweight pattern appears in the Gang of Four book, which is the seminal work on patterns in software development.
		Flyweight is a strategy in which you keep a pool of objects available and create references into the pool of objects for particular views.
		The effectiveness of the flyweight pattern as a caching mechanism depends heavily on certain characteristics of the data you are caching.
	www.theserverside.com /articles/article.tss?l=Caching (2488 words)

	XML Design Patterns - Flyweight
		From the article "Flyweight is a structural pattern used to support a large number of small objects efficiently.
		This pattern takes the original Gang of Four Flyweight pattern and places it into an XML processing context.
		The pattern discussed in the article is a processing pattern, it shows solutions to be used with code.
	www.xmlpatterns.com /Flyweight-Offsite.shtml (165 words)

	A Survey of Common Design Patterns
		The Flyweight pattern is useful for situations where you have a small number of different objects that might be needed a very large number of times—with slightly different data that can be externalized outside those objects.
		This pattern is useful for applications in which you may need to display icons to represent folders or some other object and don't want to add the overhead of creating new icons for each individual folder.
		In the next class diagram, the Flyweight class is abstract and defines an interface for all Flyweights to implement behavior to act on extrinsic data.
	www.developer.com /design/print.php/10925_1502691_3 (1147 words)

	Kristen Walcott- Lab 6
		To use this design pattern, the objects must be immutable since the objects are all shared.
		Flyweights should be used when there is a sufficiently large amount of sharing because there is extra complexity in having to maintain the related table.
		In the case of this lab, I'm not sure that the use of the flyweight pattern is really jusitified.
	cs.allegheny.edu /wiki/cs290F2004/84 (629 words)

	COMP 204: Software Design and Implementation
		The flyweight pattern should only be used when objects have lots of intrinsic data, and have extrinsic data that can be efficiently computed and transferred.
		The Facade pattern is advantageous in that it shields the clients from having to directly call any of the subsystem components, thereby layering the system and its dependencies and reducing the number of objects that clients deal with.
		A decorator pattern used in modifying an object is used to enrich the behavior of the component while chain of responsibility does not necessarily modify the object since each member of the chain may not respond to each request sent through the chain.
	www.duke.edu /~jad1/comp204 (2414 words)

	Space Invaders through Flyweight
		The design pattern employed is the flyweight pattern.
		FlyweightShipFactory is the Factory class with responsibility for ensuring optimum memory storage for flyweight objects.
		A cut-down form of the Observer pattern is also in evidence; both SpaceInvadersPanelListener and InvasionFleetListener are interfaces which may be implemented in order to receive notificatino of changes in SpaceInvadersPanel and InvasionFleet objects, respectively.
	www.redbrick.dcu.ie /~trevj/spaceinvaders.shtml (602 words)

	Design Pattern catalog
		Composite Pattern: Creates an object (a composition of objects), each of which may be a simple or a composite object.
		Proxy Pattern: creates a simple object that takes the place of a more complex object which may be invoked later, such as when the program runs in a networked environment.
		Chain of Responsibility pattern: allows decoupling between objects by passing a request from one object to the next in a chain until the request is recognized.
	www.cs.pitt.edu /~chang/231/seminars/S05pga/Page7.htm (476 words)

	Pattern Discussions
		The Singleton pattern is often paired with the Abstract Factory pattern.
		For non-creational pattern, Façade may be used with Singleton pattern in case one single instance of interface to a set of interfaces in the subsystem is needed.
		Then the caretaker and the originator are coupled and breaks the data encapsulation boundaries in the memento pattern.
	www.cs.unc.edu /~jeong/204/Patterns/index.html (3084 words)

	Design Patterns Notes
		The Flyweight design pattern is intended to save cost in this case by reducing the number of tone generators required and reducing the physical space required for equipment.
		Flyweight is often combined with the Composite pattern to implement a directed-acyclic graph with shared leaf nodes.
		Flyweight should be used in cases where many objects share simliar data except for a few items, which can be passed through parameters.
	www.ucalgary.ca /~maheinri/443/index.html (1193 words)

	Flyweight
		Flyweight objects are used when the programmer needs to deal with a large number of objects which share a significant amount of data.
		The key to understanding this comparison is remembering that in both cases there are two bodies of information: the intrinsic and the extrinsic states in the flyweights, and in the cells, respectively, the "private" macromolecule information and the other cytoplasmic information which is shared via the membrane channels.
		Of course even in a text using several fonts, with each letter in each font represented by a flyweight object, you wouldn't expect more than a few hundred of these objects, but the number of cells grouped together by cell membrane channels can be truly enormous.
	www.finucane.de /flyweigh.htm (1524 words)

	Laboratory Three, Group Four: Christopher Howell and Christopher McNamara
		The flyweight design pattern allows for the objects to be shared which enables the objects to be immutable.
		The strengths of the flyweight design pattern is that it can be used for small and or large items and it also allows for saving space.
		The strength of the singleton design pattern is that it just needs one single object which is used for everything and this saves a lot of space.
	cs.allegheny.edu /wiki/cs290F2002/103 (374 words)

	Ajaxian » Rediscovering Flyweight for Javascript
		Flyweight often rears its head when you have some kind of object pooling (e.g.
		The pattern works well with Ajax apps, where the DOM already holds a lot of context, since we’re displaying that for the user.
		Unlike Java-style Flyweights, we don’t have to declare abstract methods though; JS being dynamic, we can rely on Duck Typing, so it’s possible that our ManualComment and our TrackbackComment will each have their own markAsSpam() method, but Comment (if it exists at all), will have no such thing.
	ajaxian.com /archives/rediscovering-flyweight-for-javascript (665 words)

	Make your apps fly - Java World
		Soon enough, you'll learn how to implement flyweights and share them; in the meantime, it's sufficient to understand that flyweights are shared objects and that using them can result in substantial performance gains.
		Flyweights are typically instantiated by a flyweight factory that creates a limited number of flyweights and doles them out, one at a time, to clients.
		In that case, the flyweight factory could create one line object for each line color, such as one object for white lines and another for blue lines.
	www.javaworld.com /javaworld/jw-07-2003/jw-0725-designpatterns.html (631 words)

	Enterprise Software Pattern Synopses
		The Heartbeat pattern may be used with the Two Phase Commit pattern to ensure that the Coordinator object is able to detect catastrophic failures of component transactions in a bounded amount of time.
		The Virtual Proxy pattern, described in Volume 1, may be used by an implementation of the Persistence Layer pattern to defer the fetching of objects that are part of a more complex object but may not be needed for some uses of the complex object.
		The Change Manager pattern is often used with the persistence pattern in order to determine, based on the state of an object whether it needs to be written to the persistent store or not.
	www.mindspring.com /~mgrand/pattern_synopses3.htm (4614 words)

	Flyweight Design Pattern in C# and VB.NET
		It is common for UnsharedConcreteFlyweight objects to have ConcreteFlyweight objects as children at some level in the flyweight object structure (as the Row and Column classes have).
		code demonstrates the Flyweight pattern in which a relatively small number of objects is shared many times by different clients.
		code demonstrates the Flyweight pattern in which a relatively small number of Character objects is shared many times by a document that has potentially many characters.
	www.dofactory.com /Patterns/PatternFlyweight.aspx (238 words)

	CS4015 Review Guide
		Given an application problem to be solved by the pattern, mapping the corresponding entities to the participants of the pattern.
		Given an application problem to be solved using the flyweight pattern, identify what is extrinsic and intrinsic states of flyweights.
		Implement the flyweight pattern for a particular application problem, which may be combined with other patterns.
	www.cs.unb.ca /profs/wdu/cs4015w02/CS4015ReviewGuide.htm (909 words)

	XML Design Patterns - Flyweight
		This pattern can greatly enhance the maintainability of a document, if the same data is repeated several times, and that data changes, every occurrence of that data must be found and updated.
		Readability of the document can suffer if the Flyweight pattern is used, readers are forced to reference a different section of the document when looking at the contents.
		XHTML uses a a common attributes parameter entity that is a Flyweight.
	www.xmlpatterns.com /FlyweightMain.shtml (551 words)

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		A string is an example of a Flyweight Pattern without extrinsic state.
		At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls.
	www.unf.edu /~rzucker/cop3540dir/patterns/Flyweight.doc (149 words)

	annoying aspect of observer/multicast pattern... - GameDev.Net Discussion Forums
		i itentionly thought of the observer pattern to hook them up with graphis, sound and the like.
		since this would create an extreme memory overhead (just think of all the references to observes the small suspects had to carry!) i also considered the mulitcast pattern, what basically means a message-based design.
		but actually i could use the flyweight pattern on the observer list (instead of using it on the game objects themselves).
	www.gamedev.net /community/forums/topic.asp?topic_id=320668 (558 words)

	A C++ Flyweight Pattern for IT Management > Protecting Valuable Resources (Site not responding. Last check: 2007-11-03)
		However, the flyweight design pattern provides an elegant means of sharing objects, with a small price in terms of storage and retrieval.
		In this article, I’ll discuss a knotty little problem in networking where there is a need for a great many objects: IP numbering of device interfaces.
		The flyweight pattern can help in such situations.
	www.informit.com /articles/article.asp?p=468380 (530 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		In the flyweight pattern, there are lots of objects which are shared by all callers.
		The key is that the objects are immutable, so that each caller's instance can be the same instance that all other caller's are using.
		In Perl, we normally provide flyweights through Memoize, which you may need to download from CPAN depending on the age of your Perl.
	www.sunflower.com /~philcrow/patterns/Flyweight.html (122 words)

	Flyweight - Wikipedia, the free encyclopedia
		For the software design pattern, see Flyweight pattern.
		For the mixed martial arts division, see Flyweight (MMA).
		Some notable flyweights include Pone Kingpetch, Walter McGowan, Pascual Pérez, Pancho Villa, Dave McAuley and more recently Jorge Arce, Vic Darchinyan.
	en.wikipedia.org /wiki/Flyweight (92 words)

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