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Topic: Lazy initialization pattern

Related Topics

Creational pattern

Abstract factory pattern

Factory method pattern

Prototype pattern

Behavioral pattern

Anonymous subroutine objects pattern

Bridge pattern

Scheduler pattern

Structural pattern

Concurrency pattern

Fundamental pattern

Adapter pattern

Design pattern (computer science)

Composite pattern

Proxy pattern

	Lazy initialization - Wikipedia, the free encyclopedia
		In computer programming, lazy initialization is the tactic of delaying the creation of an object, the calculation of a value, or some other expensive process until the first time it is needed.
		In a software design pattern view, lazy initialization is often used together with a factory method pattern.
		using lazy initialization to instantiate the object the first time it is requested (lazy initialization pattern)
	en.wikipedia.org /wiki/Lazy_initialization (333 words)

	Design Pattern Synopses
		The Prototype pattern is often used with the Composite pattern.
		The Prototype pattern is often used with the Decorator pattern.
		The Virtual Proxy pattern hides the fact that an object may not yet exist from its clients, by having them access the object indirectly through a proxy object that implements the same interface as the object that may not exist.
	www.mindspring.com /~mgrand/pattern_synopses.htm (4381 words)

	patterns_java (Site not responding. Last check: 2007-10-20)
		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 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 complext object but may not be needed for some uses of the complex object.
	www.selectorweb.com /patterns_all.html (12763 words)

	Pattern: Lazy Initialization (Site not responding. Last check: 2007-10-20)
		During Instance Initialization or Class Initialization, some instance variables can be costly to initialize (either in terms of memory or time) and, indeed, they may never be used.
		The main disadvantage of lazy initialization is the time penalty associated with each access of the variable caused by the #isNil test.
		Lazy initialization should only be used if (1a) the initialization of the instance variable would take a long time, or (1b) consume a significant amount of resources and (2) there is a good chance the variable will not be used.
	www.object-arts.com /OldStuff/Patterns/LazyInitialization.htm (309 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		Key advantages of lazy evaluation are, notably, that lazy evaluation allows programmers to produce infinite sequences without pushing the evaluator into an endless loop, and other neat things.
		The opposite of lazy evaluation is eager evaluation, also known as strict evaluation which is the normal (and often only) evaluation method in most programming languages.
		As well as the formal concept of lazy evaluation in functional languages, lazy evaluation is a design pattern often seen in general computer programming.
	www.informationgenius.com /encyclopedia/l/la/lazy_evaluation.html (205 words)

	CincomSmalltalkWiki: Quick definition of Lazy Initialization
		Lazy Initialization might be considered a pattern but it works at a lower level than most patterns.
		Using lazy initialization requires the use of accessor methods.
		To do a lazy initialization, the accessor method for the variable checks to see if the variable is nil, and if so initializes it to some other, more meaningful value.
	www.cincomsmalltalk.com /CincomSmalltalkWiki/Quick+definition+of+Lazy+Initialization (585 words)

	Design Pattern Computer Science (Site not responding. Last check: 2007-10-20)
		Interest in sharing patterns in the software community has led to a number of books, symposiums, and the formation of Ward Cunningham's original wiki.
		The goal of pattern literature is to make the experience of past designers accessible to beginners and others in the field.
		It is also said that Design Patterns encourage navigational database-like structures instead of the allegedly cleaner relational approach where such structures are viewpoints instead of hard-wired into programming code.
	www.wikiverse.org /design-pattern-computer-science (749 words)

	Reaping More from Lazy Initialization Using Dynamic Reconfiguration (Site not responding. Last check: 2007-10-20)
		Lazy initialization is a technique that can be used to improve the performance of software components.
		However, the downside to lazy initialization is that in long-running systems, the cost of checking whether the variable has been initialized in every operation could become very high.
		By dynamically changing a part of a component's implementation, we are able to leverage the fast startup guaranteed by lazy initialization, and the long term benefits of not having to (unnecessarily) checking on whether a particular data object has been initialized or not.
	people.cs.vt.edu /~edwards/RESOLVE2002/proceedings/Sridhar.html (2241 words)

	Double Checked Locking Is Broken
		If you NEED lazy initialization and you CANNOT stomach the overhead of always acquiring the mutex (this is the least likely case), then leverage the class loader's behavior to guard the construction of the singleton.
		Subsequently, if any thread(s) accesses the initialized object, since its "initialized" variable is false, the synchronized method "initialize" would be called, which would set up all the data in the object and set initialized to true.
		Double-checked locking is typically an initialization pattern, used to guard a one-shot monotonic state transition (from the "not initialized" state to the "initialized" state), and often the thing being guarded is not business data.
	www.c2.com /cgi/wiki?DoubleCheckedLockingIsBroken (1494 words)

	Lazy Initialization (Site not responding. Last check: 2007-10-20)
		This pattern is applicable to all objects where the creation of some instance variables cost either in terms of time or memory and they may never be used.
		This pattern is used as basis of a large numer of aother patterns, such as Singleton.
		The point is that is the one who is using the class the one who should decide which approach is better to the scenario, and it's not easy to design a OO model that lets you decide in runtime if you want eager loading or lazy loading.
	weblogs.asp.net /pgreborio/posts/9773.aspx (602 words)

	Design Patterns: Singleton
		The classes and/or objects participating in the Singleton pattern are:
		code demonstrates the Singleton pattern which assures only a single instance (the singleton) of the class can be created.
		Only a single instance (the singleton) of the class can be created because servers may dynamically come on- or off-line and every request must go throught the one object that has knowledge about the state of the (web) farm.
	www.dofactory.com /Patterns/PatternSingleton.aspx (183 words)

	dBforums - Long question: lazy initialization pattern?
		The order of static time initialization of constants is undefined.
		specify the semantics: a lazy constant is a constant that initializes itself at the
		If you want lazy initialization then do not make them consts.
	dbforums.com /t481221.html (3478 words)

	Dan's blog
		I was motivated initially by the fact that my audio drivers skip regularly.
		Initially, the attending physician from the ED told us that it would take 48 hours for her cultures to develop and that we should keep her there at least that long.
		The rings we had were cast, but they're from a mold of a filigree pattern, and it's hard to get the little details right in a casting.
	www.risacher.org /blog (10051 words)

	DrawPrimitive
		In the source code presented with this article I'll assume that all DirectX initialization is done in a single routine which accepts a boolean variable called bHardware.
		Here's my initialization code for creating the primary and offscreen surfaces, which are stored in the m_pPrimary and m_pBackBuffer member variables respectively (the code presented here uses the Flip function rather than my own method of Bltting):
		Also notice that I'm lazy and don't bother casting my values to D3DVAL (which is type float), doing so makes the code longer and a bit more difficult to read anyway.
	www.geocities.com /SiliconValley/2151/drawprim.html (6528 words)

	Re: Solving Lazy Initialization and double checked locking problem
		The problem DCL was designed to solve was to provide a solution to preventing access to a lazily initialised singleton when it is in an inconsistant state, in a environment with at least two threads, that is less time costly than synchronizing the whole method.
		As close to minimal complexity threadsafe singleton patterns exist, there doesn't seem to be much point in creating new ones, but it's your time to spend.
		DCL is a pattern to solve an engineering problem which manifested strongly in the early JVMs, and weakly in later ones.
	www.usenet.com /newsgroups/comp.lang.java.programmer/msg13794.html (685 words)

	Creational pattern (Site not responding. Last check: 2007-10-20)
		In software engineering, creational design patterns are design patterns that deal with object creation mechanisms, trying to create objects in a manner suitable to the situation.
		Creational design patterns solve this problem by somehow controlling this object creation.
		The article about Creational pattern contains information related to Creational pattern.
	www.arikah.net /encyclopedia/Creational_pattern (91 words)

	Citations: Smalltalk Best Practice Patterns - Beck (ResearchIndex)
		In comparison with usability evaluation or participant observation, an approach based on corpus analysis requires a sample of several hundreds of programs, but does not require detailed analysis of the process by which those programs were written.
		....to present their experiences with design patterns in [BC 96] This is a widely cited article on the costs and benefits of pattern integration by some of the major proponents of the approach.
		Even in a fairly rough form, the SBPP was used successfully in two projects: the first with a team of five developers at Hewitt Associates, the second with 25 30 developers at Orient Overseas....
	citeseer.ist.psu.edu /context/205181/0 (1849 words)

	Optimization (computer science) - Open Encyclopedia (Site not responding. Last check: 2007-10-20)
		The choice of algorithm affects efficiency more than any other item of the design.
		More complex algorithms and data structures perform well with many items, while simple algorithms are more suitable for small amounts of data — the setup and initialization time of the more complex algorithm can outweigh the benefit of the better algorithm.
		The more memory the program uses, the faster it will generally run.
	open-encyclopedia.com /Software_optimization (1365 words)

	Re: Solving Lazy Initialization and double checked locking problem
		Not only that, I also believe that this pattern can be used to solve other problems as well.
		DCL compromised > deterministic thread safety with probabalistic thread safety (there are > no recorded examples of it failing, but it is theoretically possible) in > order to gain a speed advantage by not using synchronization, as > synchronization was costly at the time.
		Without profiling your pattern in a realistic > sscenario, there is nothing to judge its merit, and the simplist > solution wins.
	www.usenet.com /newsgroups/comp.lang.java.programmer/msg13759.html (792 words)

	Use Lazy Initialization to Conserve Resources (Site not responding. Last check: 2007-10-20)
		Consider waiting to create the property until it's actually needed—especially if you are creating large numbers of these objects.
		Or you could use lazy initialization to delay the creation until the SalesPerson object is actually needed:
		If you know ahead of time that the property will always be used, then lazy initialization is inappropriate because it simply adds complexity to your code.
	www.devx.com /tips/Tip/18007?trk%3DDXRSS_JAVA (258 words)

	Lazy initialization (Site not responding. Last check: 2007-10-20)
		Each time the desiredthing is summoned, the flag is tested.
		In a software design pattern view, lazyinitialization is often used together with a factory methodpattern.
		The Fruitclass itself doesn't do anything here, this is just an example to show the architecture.
	www.therfcc.org /lazy-initialization-319321.html (256 words)

	.NET 247 : what Pattern for that situation? on microsoft.public.dotnet.languages.csharp (Site not responding. Last check: 2007-10-20)
		Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion.
		simple, i hope someone have created some kinda pattern to resolve it.
		Anyway, i will try to find some kind of pattern to resolve the situation.
	www.dotnet247.com /247reference/msgs/45/229771.aspx (484 words)

	Oa-Om
		A collection of Fortran solvers for the initial value problem for ordinary differential equation (ODE) systems.
		It currently includes six solvers, suitable for both stiff and nonstiff systems, and includes solvers for systems given in linearly implicit form as well as solvers for systems given in explicit form.
		The project was initiated by the designers of S, R and XLispStat, and is directed to anyone wanting to extend the computing capabilities in one of those existing languages, those interested in statistical software based on Java and the Web, and those interested in the design of new statistical languages.
	stommel.tamu.edu /~baum/linuxlist/linuxlist/node35.html (6776 words)

	JavaChina: FAQ on XML by Roseanne Zhang
		More interesting thing is JDOM tree is not all built into memory, it is built on demand (lazy initialization design pattern).
		In GoF design pattern terminology, it is called Observer/Observable design pattern, or Publisher/Subscriber design pattern.
		Dan Drillich copied from XML in a nutshellThe SAX API is unique among XML APIs because it's an event-based push model rather than a tree-based pull model.
	bobcat.webappcabaret.net /javachina/faq/xml_01.htm (3683 words)

	Lazy stream initialization and custom IDisposable implementation (Site not responding. Last check: 2007-10-20)
		Posted on Thursday, May 19, 2005 1:58 PM
		Here's how I've been implementing lazy stream initialization and the IDisposable interface in custom stream based file parsers I've been writing recently.
		It's extended from Microsoft's implementation of the Dispose pattern here: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpgenref/html/cpconfinalizedispose.asp
	geekswithblogs.net /shriop/archive/2005/05/19/40050.aspx (84 words)

	Microsoft Visual Basic .NET Programmer's Cookbook ISBN: 0-7356-1931-X (Site not responding. Last check: 2007-10-20)
		1.19 Find All Occurrences of a Pattern in a String 30
		1.20 Replace All Occurrences of a Pattern in a String 32
		4.12 Perform Selective Serialization with the Memento Pattern 135
	www.stolin-software.com /04booklist/0-7356-1931-X.html (1447 words)

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