In software engineering , structural design patterns are Design pattern computer science design patterns that ease the design by identifying a simple way to realize relationships between entities. Examples of Structural Patterns include Adapter pattern adapts one interface for a class into one that a client expects Retrofit Interface Pattern ref http c2.com cgi wiki?RetrofitInterfacePattern ref ref http c2.com cgi wiki?ExternalPolymorphism ref An adapter used as a new interface for multiple classes at the same time. Adapter pipeline Use multiple adapters for debugging purposes. ref http c2.com cgi wiki?AdapterPipeline ref Aggregate pattern a version of the Composite pattern with methods for aggregation of children Bridge pattern decouple an abstraction from its implementation so that the two can vary independently Tombstone An intermediate lookup object contains the real location of an object. ref http c2.com cgi wiki?TombStone ref Composite pattern a tree structure of objects where every object has the same interface Decorator pattern add additional functionality to a class at runtime where subclassing would result in an exponential rise of new classes Extensibility pattern aka. 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 high quantity of objects share a common properties object to save space Proxy pattern a class functioning as an interface to another thing Pipes and filters a chain of processes where the output of each process is the input of the next Private class data pattern restrict accessor mutator access See also Behavioral pattern Creational pattern Concurrency pattern References reflist DEFAULTSORT Structural Pattern Category Software design patterns soft eng stub bs ema strukture hu Szerkezeti minta ru sr uk zh ... more details
For other meanings Plaid disambiguation Plaid A plaid is a pattern consisting of crossed horizontal and vertical bands in two or more colors in woven cloth. Common examples of plaid patterns include Tartan , the pattern most commonly associated with plaid. Gingham and Border tartan , featuring bands of equal widths in a simple pattern similar to Check pattern . Tattersall cloth , featuring very wide bands alternating with very narrow bands of contrasting colors. Madras cloth Scotland topics fabric Category Textile patterns ... more details
In software engineering , behavioral design patterns are design pattern computer science design pattern s that identify common communication patterns between objects and realize these patterns. By doing so, these patterns increase flexibility in carrying out this communication. Examples of this type of design pattern include Chain of responsibility pattern Command objects are handled or passed on to other objects by logic containing processing objects Command pattern Command objects encapsulate an action ... a stack. ref http c2.com cgi wiki?ExternalizeTheStack ref Interpreter pattern Implement a specialized computer language to rapidly solve a specific set of problems Iterator pattern Iterators are used ... Mediator pattern Provides a unified interface to a set of interfaces in a subsystem Memento pattern Provides the ability to restore an object to its previous state rollback Null Object pattern designed to act as a default value of an object Observer pattern aka Publish Subscribe or Event ... pattern De couple an observer from an observable. ref http c2.com cgi wiki?WeakReferencePattern ref .... ref http c2.com cgi wiki?ProtocolStack ref State pattern A clean way for an object to partially change its type at runtime Strategy pattern Algorithms can be selected on the fly Specification pattern Recombinable Business logic in a boolean fashion Template method pattern Describes the program skeleton of a program Visitor pattern A way to separate an algorithm from an object Single serving visitor pattern Optimise the implementation of a visitor that is allocated, used only once, and then deleted Hierarchical visitor pattern Provide a way to visit every node in a hierarchical data structure such as a tree. Scheduled task pattern A task is scheduled to be performed at a particular interval or clock time used in real time computing See also Structural pattern Creational pattern Concurrency pattern References references Category Software design patterns bs ema pona anja hu Viselked si ... more details
Orphan date November 2007 att June 2011 inline date December 2011 expert Computer science date June 2011 In software engineering , an amelioration pattern is an anti pattern formed when an existing software design pattern computer science design pattern was edited i.e. rearranged, added or deleted to better suit a particular problem so as to achieve some further effect or behavior. In this sense, an amelioration pattern is transformational in character. References cite journal title The use of anti patterns in human computer interaction wise or Ill advised? url http dl.acm.org citation.cfm?id 1035074 author1 Judy Van Biljon author2 Paula Kotz author3 Karen Renaud author4 Marilyn McGee author5 Ahmed Seffah journal Proceedings of the 2004 annual research conference of the South African institute of computer scientists and information technologists on IT research in developing countries SAICSIT 04 External links http c2.com cgi wiki?AmeliorationPattern Amelioration Pattern at the Portland Pattern Repository Category Software design patterns soft eng stub ... more details
Orphan date February 2009 Unreferenced date December 2007 Fundamental patterns are one of the types of design pattern computer science design pattern s. They are termed fundamental as they form the basic building blocks of the other patterns. Most of the other patterns and most modern applications draw on these patterns in one way or another. Examples of this class of patterns include Delegation pattern an object outwardly expresses certain behaviour but in reality delegates responsibility Functional design strives for each modular part of a computer program has only one responsibility and performs that with minimum side effects Interface pattern method for structuring programs so that they re simpler to understand Proxy pattern an object functions as an interface to another, typically more complex, object Facade pattern provides a simplified interface to a larger body of code, such as a class library. Composite pattern defines Composite object e.g. a shape designed as a composition of one or more similar objects other kinds of shapes geometries , all exhibiting similar functionality. The Composite object then exposes properties and methods for child objects manipulation as if it were a simple object. See also Design pattern computer science Category Software design patterns comp sci stub bs Osnovna ema ... more details
Orphan date February 2009 Unreferenced date November 2008 In tableware the Ozier pattern is a molded basket weave pattern produced in Germany in the 1730 s on Meissen porcelain tableware. It was probably one of the numerous inventions of the celebrated modeler Johann Joachim Kaendler . Category Decorative arts Category Porcelain ceramics stub ... more details
File Plastic pattern blocks.JPG thumb Plastic pattern blocks File Wooden pattern blocks dodecagon.JPG thumb A dodecagon made from wooden pattern blocks Pattern blocks are a type of mathematical manipulatives , developed in the sixties by the Elementary Science Studies ref http www.picciotto.org math ed angles index.html Picciotto Math Education ref . They allow children to see how shapes can be decomposed into other shapes and introduces them to Tessellation tilings . The standard pattern blocks are divided into two different sets. In the first set, the shapes can all be built out of the green equilateral triangle. This set contains Equilateral triangle Green Regular rhombus Blue Trapezoid Red Hexagon Yellow The second set contains shapes that can t be built of the green triangle, but can still be used in tiling patterns Square geometry Square Orange Small rhombus Beige Pattern blocks are not only just for mathematics, they can also be used to build pictures including animals, flowers, boats and ships, rockets and planes, cars, trains, and many others. A lot of graphic designers use pattern blocks for artistic purposes. References references External links http www.patternblocktemplates.com Pattern Block Templates Printable Worksheets for Pattern Blocks http mathtoybox.com patblocks3 patblocks3.html Flash Pattern Blocks online http www.etacuisenaire.com ETA Cuisenaire Educational manipulatives & supplemental materials for grades PreK 12. http www.coe.ufl.edu esh Projects ess.htm Background on the Elementary Science Study http www.assessmentservices edu.com patternblocks.aspx Educational and supplemental materials for K 12 Category Mathematics education Category Mathematical manipulatives ... more details
The Hikkake pattern or Hikkake , is a technical analysis pattern used for determining market turning points and continuations. It is a simple pattern that can be observed in market price data, using traditional bar chart s, point and figure chart s, or Japan ese candlestick chart s. The pattern does not belong to the collection of traditional candlestick chart patterns. Though some have referred to the hikkake pattern as an inside day false breakout or a fakey pattern ref cite web url http www.learntotradethemarket.com ... by Nial Fuller accessdate 2012 03 09 ref , these are deviations from the original name given to the pattern by Daniel L. Chesler, CMT and are not popularly used to describe the pattern. For example, the name hikkake pattern has been chosen over inside day false breakout or fakey pattern by the majority ... Commodity Trader by Peter L. Brandt. Conceptual basis The pattern consists of a measurable period ... the likely future direction of price. The pattern, once formed, yields its own set of trading parameters ... stops , and the expected profit target. The pattern is not meant as a stand alone system for market ... analysis fundamental market analysis methods. Description The pattern is recognized in two variants, one bearish and one bullish. In both variants, the first bar of the pattern is an inside ... low and lower high for the bullish variant. Before the pattern produces a trading signal it must be confirmed this happens when the price passes below the low of the first bar of the pattern ... The hikkake pattern was first discovered and introduced to the financial community through a series ..., Tokyo University of Foreign Studies. Institutional uses The hikkake pattern has been adopted for use ... False Moves with the Hikkake Pattern http www.chesler.us resources articles TechAnalyst Nov04.pdf Quantifying Market Deception with The Hikkake Pattern http thepatternsite.com HikkakeBull.html Noted ... of the Hikkake pattern technical analysis Category Candlestick patterns Stockexchange stub ... more details
In software architecture , a messaging pattern is a network oriented architectural pattern which describes how two different parts of a message passing system connect and communicate with each other. In telecommunications , a message exchange pattern MEP describes the pattern of Message passing messages required by a communications protocol to establish or use a communication channel . There are two major message exchange patterns a request response pattern, and a one way pattern. For example, the Hypertext Transfer Protocol HTTP is a request response pattern protocol, and the User Datagram Protocol UDP has a one way pattern. ref cite book last Erl first Thomas title Service Oriented Architecture Concepts, Technology, and Design year 2005 publisher Pearson Education location Indiana isbn 0 13 185858 0 pages 171 ref SOAP The term Message Exchange Pattern has a specific meaning within the SOAP ... only a status response. Robust In Only This pattern is for reliable one way message exchanges ... trigger a fault message. Robust Out Only similar to the out only pattern, except it can trigger ... pattern to be used, and are particularly optimized for that kind of patterns. The basic MQ patterns ... pattern. clarify date November 2010 Publish subscribe Publish subscribe connects a set of publishers to a set of subscribers. This is a data distribution pattern. clarify date November 2010 Push pull connects nodes in a fan out fan in pattern that can have multiple steps, and loops. This is a parallel task distribution and collection pattern. clarify date November 2010 Exclusive pair connects two sockets in an exclusive pair. This is a low level pattern for specific, advanced use cases. Each pattern ... Oriented Architecture http www.eaipatterns.com toc.html Enterprise Integration Patterns Pattern Catalog DEFAULTSORT Messaging Pattern Category Distributed computing architecture Category Network ... pt Messaging pattern ... more details
In music a privileged pattern is a Motif music motive , Figure music figure , or chord music chord which is repeated and Transposition music transposed so that the transpositions form a recognizable pattern . The pattern of transposition may be either by a repeated interval music interval , an interval cycle , or a Steps and skips stepwise line of major second whole tones and semitone s. The pattern is said to be privileged because it requires no context and is a precompositional technique. Wilson 1992, p.39 40 See also Sequence music Source Wilson, Paul 1992 . The Music of B la Bart k . ISBN 0 300 05111 5. Category Music theory music theory stub ... more details
Image proxy pattern diagram.svg thumb 400px Proxy in Unified Modeling Language UML Image Proxy pattern in LePUS3.gif thumb 400px Proxy in Lepus3 LePUS3 http lepus.org.uk ref legend legend.xml legend In computer programming , the proxy pattern is a software design pattern . A proxy, in its most general form, is a class functioning as an interface to something else. The proxy could interface to anything a network connection, a large object in memory, a file, or some other resource that is expensive or impossible to duplicate. A well known example of the proxy pattern is a reference counting smart pointer pointer object. In situations where multiple copies of a complex object must exist, the proxy pattern can be adapted to incorporate the flyweight pattern in order to reduce the application s memory footprint. Typically, one instance of the complex object and multiple proxy objects are created, all of which contain a reference to the single original complex object. Any operations performed ... pattern, not to show how it interacts with subtleties of every language under the sun. Feel free to add ... language Java example illustrates the virtual proxy pattern. Clarify date March 2012 The code ... Reflist 2 See also Composite pattern Decorator pattern Lazy initialization External links http wiki.java.net bin view Javapedia ProxyPattern Proxy pattern in Java http www.lepus.org.uk ref companion Proxy.xml Proxy pattern in UML and in LePUS3 a formal modelling language http www.javaworld.com javaworld jw 02 2002 jw 0222 designpatterns.html Take control with the Proxy design pattern by David ... Project , Provides componentized implementation of the Proxy Pattern in Java http www.netobjectives.com ... vs. Facade Pattern Comparison http sourcemaking.com design patterns proxy Proxy Design Pattern http c2.com cgi wiki?ProxyPattern Proxy pattern description from the Portland Pattern Repository Design ... conception ko it Proxy pattern lt Proxy objektas ja Proxy pl Pe nomocnik wzorzec projektowy ... more details
factory pattern , Factory method pattern , Builder pattern , Prototype pattern , and Singleton pattern . Definition The creational patterns aim to separate a system from how its objects are created ... and List Example Some examples of creational design patterns include Abstract factory pattern centralize decision of what Factory method pattern factory to instantiate Factory method pattern ... pattern separate the construction of a complex object from its representation so that the same construction process can create different representations Lazy initialization pattern tactic of delaying ... time it is needed Object pool pattern avoid expensive acquisition and release of resources by recycling objects that are no longer in use Prototype pattern used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects Singleton pattern restrict instantiation of a class to one object References reflist See also Behavioral pattern Structural pattern Concurrency pattern DEFAULTSORT Creational Pattern Category Software design patterns Compu ... more details
A pattern language , a term coined by architect Christopher Alexander , is a structured method of describing ... problems. Like all languages, a pattern language has vocabulary , syntax , and grammar . The odd part is that the language is applied to some complex activity other than communication. In pattern ... description, the grammar and syntax cross index often with a literal alphabetic index of pattern ..., and work toward the unknown parts. At the same time, if the pattern language has worked well ... the design. What is a pattern? When a designer is designing something whether it is a house or a computer ... is a single design pattern . Each pattern has a name, a descriptive entry, and some cross references, much like a dictionary entry. A documented pattern should explain why that solution is good in the pattern s contexts. Many patterns form a language Just as words must have Grammar grammatical ... patterns must be related to each other in position and utility order to form a pattern language .... In the language, therefore, each pattern has to indicate its relationships to other patterns and to the language ... a pattern language is in fact to get a reliable, complete list of the problems to be solved. Of course ... advocated on site improvisation by concerned, empowered users ref A Pattern Language, ibid ref ... to empower users of architecture was, in fact, what led Alexander to undertake a pattern language ... of future systems. The idea expressed in a pattern should be general enough to be applied in very .... The range of situations in which the problems and solutions addressed in a pattern apply is called its context. An important part in each pattern is to describe this context. Examples can further illustrate how the pattern applies to very different situation. For instance, Alexander s pattern A PLACE ..., the problems and solutions described in a pattern can vary in their level of abstraction and generality .... However, even a very abstract pattern will usually contain examples that are, by nature ... more details
Pattern bargaining is a process in labour relations, where a trade union gains a new and superior entitlement from one employer and then uses that agreement as a precedent to demand the same entitlement or a superior one from other employers. In the United States, pattern bargaining was pioneered by unions such as the United Auto Workers and the Teamsters . The first step of the bargaining process is the identification of a target employer that is most likely to agree to a favorable employment contract. For the selected company, this provides an opportunity to influence the contract for the industry, while the downside is the risk of a labor disruption if negotiations stall or fail. Once this contract has been successfully negotiated and ratified by the unionized workers, the union declares it a pattern agreement and presents it to the other employers as a take it or leave it offer. In Australia , pattern bargaining was specifically outlawed under the now repealed WorkChoices legislation. The law was repealed by the Labor party after their victory in the Australian federal election, 2007 2007 election , but Labor s Fair Work Act, which came into force on 1 July 2010, still outlaws pattern bargaining. References Marshall, Robert, and Antonio Merlo. 1996. Pattern bargaining. http research.mpls.frb.fed.us research sr sr220.pdf Federal Reserve Bank of Minneapolis Research Department Staff Report 220 . Category Trade unions references ... more details
In sewing and fashion design , a pattern is an original clothing garment from which other garments of a similar ... called paper patterns . Patternmaking , pattern making or pattern cutting is the art of designing patterns. A custom fitted basic pattern from which patterns for many different styles can be created is called a sloper or block . Pattern making A custom dressmaker frequently employs one of three pattern creation methods. The flat pattern method begins with the creation of a sloper or block , a basic pattern for a fitted, wiktionary jewel neck jewel neck bodice and narrow skirt , made to the wearer ... employed in menswear and involves drafting a pattern directly onto pattern paper using a variety of straightedges and curves. Since menswear rarely involves draping , pattern making is the primary preparation .... If this draft will be frequently used, a sloper is created to speed up the production time. A pattern maker would use various tools such as a notcher, drill and awl to mark the pattern in places. The pattern ... the flat pattern method. This is because it is nearly impossible to account for the way a fabric will drape ... mock up pattern by pinning fabric directly on a dress form , then transferring the muslin outline and markings onto a paper pattern or using the muslin as the pattern itself. Pattern grading Pattern grading is an essential part of pattern making. It decides how patterns increase or decrease sizes. According to countries, pattern grading includes USA s, EUR s, UK s, and CHN s. Generally, pattern grading adjusts for people of different ages and genders. The fabric type also influences the pattern grading standards. ref http www.cutcnccam.com article show 2011914112666.shtml Pattern Grading ref ... of pattern grading is incomplete without considering marker making. ref http www.cutcnccam.com ... thumb 200px right Home sewing pattern Home sewing patterns are generally printed on tissue paper and sold ... sewing pattern in 1863 based on grading systems used by Victorian Era Victorian tailors , originally ... more details
orphan date June 2009 Pattern gardening is a method of designing gardens influenced by the concepts of patterns and pattern language originated by Christopher Alexander . It reflects the archetypal patterns of garden making, based on proportions and how the senses react. Patterns give coherence to garden design and communicate creativity and aesthetics. Specific elements are instinctively looked for in a garden. Working with these elements is the basis for all good garden design. Each such element, or pattern, is archetypal, and therefore any pattern can be easily adapted to any garden situation. The fourteen pattern elements are Scale, which relates the garden to the environment Garden rooms, which divide and connect the garden Pathways, which define what we see in the garden Bridges, which differentiate garden spaces and create compelling focal points Gates, which are the portal to the garden Shelters, which anchor the garden in space Borders, which separate and make distinct garden sections Patios, which tie the house to the landscape Sheds, which add texture Focal points, which create destinations in the garden Water, which fully engages the senses Ornamentation, which creates mood Containers, which allow artistic flexibility and, Materials, which add bulk, solidity, and softness to the garden. References Easton, Valerie. A Pattern Garden The Essential Elements of Garden Making. Timber Press Portland, 2007. ISBN 978 0 88192 780 1 Category Design Category Types of garden Category Landscape architecture ... more details
Orphan date February 2009 Unreferenced date October 2007 Mangler is a software design pattern computer science design pattern . A Mangler is a pattern that performs multiple operations over a series of data, similar to the MapReduce function inside of BigTable and Amazon s Dynamo . Typically, a mangler is fed a series of Maps from which it performs its internal operations and passes its internal state data to an external Filter. A typical usage of the Mangler Pattern is during internal search operations. When parsing a query from an end user, the system will try and strip out a series of un needed tokens, reassembling the original query into a more usable, functional query. An important distinction between the Mangler and other patterns is the Modify in place optimization, pioneered by the pattern s creator. This pattern was created by John Watson Programmer Dr. John Watson , during his tenure at TransUnion s Research and Development Lab. Java source lang java This is a trivial implementation of Mangler in Java. public interface TokenMangler List String mangleTokens List String tokens public class LowerCasingTokenMangler implements TokenMangler List String mangleTokens List String tokens List String results new ArrayList String for String token tokens results.add token.toLowerCase return results source Category Software design patterns ... more details
A weighting pattern for a linear dynamical system describes the relationship between an input math u math and output math y math . Given the time variant system described by math dot x t A t x t B t u t math math y t C t x t math then the output can be written as math y t y t 0 int t 0 t T t, sigma u sigma d sigma math where math T cdot, cdot math is the weighting pattern for the system. For such a system the weighting pattern is math T t, sigma C t phi t, sigma B sigma math such that math phi math is the state transition matrix . The weighting pattern will determine a system, but note that if there exists a Realization systems realization for this weighting pattern then there exists many that do so. ref cite book first Roger W. last Brockett title Finite Dimensional Linear Systems publisher John Wiley & Sons year 1970 isbn 9780471105855 ref Linear time invariant system In a LTI system then the weighting pattern is Continuous math T t, sigma C e A t sigma B math where math e A t sigma math is the matrix exponential . Discrete math T k,l C A k l 1 B math . References Reflist Category Control theory ... more details
Weasel date January 2011 Refimprove date September 2010 Image Blueandwhite2.jpg thumb The Willow pattern File Willow Pattern.jpg thumb Illustration of the Willow pattern 1917 . Image Williamson s Tunnels Plates.jpg thumb Many plates featuring the Willow pattern were found in Williamson s tunnels The Willow pattern , more commonly known as Blue Willow , is a distinctive and elaborate pattern used on ceramic kitchen housewares. The pattern was designed by Thomas Minton around 1790 and has been in use ... porcelain, with a design date of 1780. Willow refers to the pattern, a specific treatment, either applied ... and dates of production vary. Legend behind the pattern In order to promote sales of Minton s Willow pattern, various stories were invented based on the elements of the design. The most famous story ... http www.nyu.edu projects mediamosaic madeinchina pdf Portanova.pdf Porcelain, The Willow Pattern, and Chinoiserie ... the birds do not appear on the earliest willow pattern plates . ref http www.thepotteries.org patterns ... pointing to various designs on the plate. Cultural impact of the story The story of the willow pattern was turned into a comic opera in 1901 called The Willow Pattern . It was also told in a 1914 silent film called Story of the Willow Pattern . Robert van Gulik also used some of the idea in his Chinese detective novel The Willow Pattern book The Willow Pattern . In 1992, Barry Purves made a short ... http www.thepotteries.org patterns willow.html Site shows a beautiful photograph of the pattern ... of the willow pattern http www.thepotteries.org patterns willow patt.html Another site with information about the legend of the willow pattern http www.spode.co.uk history history willow.html The Spode Museum Trust s Willow Pattern webpage http www.spode.co.uk History willow legend.html Legend of the Willow Pattern Plate by Mary L. Stollard http www.bluewillow.co.nz Short animated film telling ... at Dorchester ARTS IMDb title id 0257202 title Story of the Willow Pattern DEFAULTSORT Willow Pattern ... more details
noref date January 2011 examplefarm date January 2011 In computer programming , the adapter pattern often referred to as the wrapper pattern or simply a wrapper is a design pattern computer science design pattern that translates one Interface computer science interface for a Class computer science class ... Object Adapter pattern In this type of adapter pattern, the adapter contains an instance of the class ... object . Image ObjectAdapter.png center thumb 300px The object adapter pattern expressed in Unified ... Object pattern in LePUS3.png center thumb 500px The object adapter pattern expressed in Lepus3 LePUS3 . Class Adapter pattern This type of adapter uses multiple subtype polymorphism polymorphic interfaces ... center thumb 300px The class adapter pattern expressed in UML. Image Adapter Class pattern in LePUS3.png center thumb 500px The class adapter pattern expressed in Lepus3 LePUS3 The adapter pattern is useful ... pattern is listed in the links below. A further form of runtime Adapter pattern There is a further form of runtime Adapter pattern as follows It is desired for classA to supply classB with some ... at runtime by means of the Factory pattern . A solution using adapters proceeds as follows i define ... examples from your favorite programming language here this page exists to explain the design pattern ... pattern When implementing the adapter pattern, for clarity use the class name AdapteeClassName ... function Delegation programming Delegation , strongly relevant to the object adapter pattern. Dependency inversion principle , which can be thought of as applying the Adapter pattern, when the high ... a formal modelling language http www.c2.com cgi wiki?AdapterPattern Description in Portland Pattern ... Design Pattern in CodeProject http perfectjpattern.sourceforge.net dp adapter.html PerfectJPattern Open Source Project , Provides componentized implementation of the Adapter Pattern in Java http ginstrom.com scribbles 2009 03 27 the adapter pattern in python The Adapter Pattern in Python detailed tutorial ... more details
Proactor is a design pattern computer science software design pattern for Event handling in which long running activities are running in an asynchronous part. A Completion Handler is called after the asynchronous part has terminated. The proactor pattern can be considered to be an asynchronous variant of the Synchronization computer science synchronous reactor pattern ref Pattern Oriented Software Architecture, Volume 2, Schmidt et al., Jon Wiley & Sons, Ltd, 2000 ref . Interaction File Proactor.VSD SequenceDiagram.png thumb Unified Modeling Language UML Sequence diagram of Proactor 400px Operation specific actors The Proactive Initiator starts the asynchronous operation via the Asynchronous Operation Processor and defines the Completion Handler Completion Handler is a call at the end of the operation from the Asynchronous Operation Processor Asynchronous Operation Standardized actors The Asynchronous Operation Processor controls the whole asynchronous operation The Completion Dispatcher handles the call , depending on the execution environment. Implementations http www.boost.org doc libs release doc html boost asio overview core async.html Proactor and Boost.Asio C http www.cs.wustl.edu schmidt ACE.html The ADAPTIVE Communication Environment C See also Reactor pattern a pattern that also asynchronously queues events, but demultiplexes and dispatches them synchronously References reflist External links http www.cs.wustl.edu schmidt PDF proactor.pdf Proactor An Object Behavioral Pattern for Demultiplexing and Dispatching Handlers for Asynchronous Events , Irfan Pyarali, Tim Harrison, Douglas C. Schmidt , Thomas D. Jordan, 1997 pdf 143 kB Category Software design patterns Concurrent computing Software engineering stubs software eng stub de Proactor ... more details
orphan date September 2008 A pattern file is a computer file containing information which allows compatible antivirus software to identify viruses. References http www.trendmicro.com.au consumer security info what pattern.php Category Computer file systems computer stub ... more details
Refimprove date February 2011 lead rewrite date March 2012 about pattern matching in functional programming string matching and pattern recognition In computer science , pattern matching is the act of checking some sequence of tokens for the presence of the constituents of some pattern . In contrast to pattern recognition , the match usually has to be exact. The patterns generally have the form of either string computer science sequences or tree structure s. Uses of pattern matching include outputting the locations if any of a pattern within a token sequence, to output some component of the matched pattern, and to substitute the matching pattern with some other token sequence i.e., search and replace ... construct . Pattern matching sometimes include support for guard computing guards . Term rewriting and Graph rewriting languages rely on pattern matching for the fundamental way a program evaluates into a result. History Expand section date May 2008 The first computer programs to use pattern matching were text editors. citation needed obviously, the first programs doing pattern matching, even ... with pattern matching constructs include SNOBOL from 1962, SASL programming language SASL from ... programming language with tree based pattern matching features was Fred McBride s extension of LISP ... patterns The simplest pattern in pattern matching is an explicit value or a variable. For an example ... Here, 0 is a single value pattern. Now, whenever f is given 0 as argument the pattern matches and the function ... is a single variable pattern, which will match absolutely any argument and bind it to name n to be used .... The wildcard pattern often written as code code is also simple like a variable name, it matches ... other values. The difference then is that with variable and wildcard parts, a pattern doesn t build ... and the elements that are allowed to vary within the structure of the pattern. A tree pattern ... some unspecified with a variable or wildcard pattern. It may help to think of the abstract syntax ... more details
Refimprove date December 2010 No footnotes date December 2010 The balking pattern is a design pattern computer science software design pattern that only executes an action on an object computer science object when the object is in a particular state. For example, if an object reads ZIP file format ZIP files and a calling method invokes a get method on the object when the ZIP file is not open, the object would balk at the request. In the Java programming language Java programming language, for example, an IllegalStateException might be thrown under these circumstances. There are some specialists who date November 2010 in this field who think this is more of an anti pattern , than a design pattern. If an object cannot support its API, it should either limit the API so that the offending call is not available or so that the call can be made without limitation, it should Be created in a sane state Not make itself available until it is in a sane state Become a Facade pattern facade and answer back an object that is in a sane state Usage Objects that use this pattern are generally only in a state that is prone to balking temporarily but for an unknown amount of time. Citation needed date May 2009 If objects are to remain in a state which is prone to balking for a known, finite period of time, then the guarded suspension pattern may be preferred. Implementation Below is a general, simple example for an implementation of the balking pattern as originally seen in harvtxt Grand 2002 . As demonstrated by the definition above, notice how the synchronized line is utilized. If there are multiple calls to the job method, only one will proceed while the other calls will return with nothing. Another thing to note is the code jobCompleted code method. The reason it is synchronized is because ..., Ind . See also Read and write lock pattern Guarded suspension Guarded suspension pattern DEFAULTSORT Balking Pattern Category Software design patterns ... more details
In music , a melodic pattern is a repetitive pattern that can be used with any scale music scale . It is used primarily for use in solo music solos because, when practiced enough, it can be extremely useful when musical improvisation improvising . Image C major scale melodic pattern.png thumb center 400px Melodic pattern in C major. ref Berle, Arnie 1997 . Mel Bay Encyclopedia of Scales, Modes and Melodic Patterns , p.9. ISBN 0786617918. ref See also Isorhythm Color isorhythm Sources reflist music theory stub Musical improvisation Category Melody ... more details
Encyclopedia
top
