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| | Thomas Chau's Web Site > Course Works |
 | | The consequence of using the Proxy pattern is (1) provides location transparency for distributed systems through the use of remote proxies, (2) provides optimization through the use of virtual proxies, (3) additional housekeeping tasks can be done when an object is accessed. | | | The Proxy pattern is applicable whenever you need a more sophisticated reference to an object than just a pointer. | | | This is to ensure that the difference between the proxy object and the RealSubject object is transparent to the clients. |
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http://sern.ucalgary.ca/~chauth/courses/seng60904/proxy.htm
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| | Explore the Dynamic Proxy API |
| | The proxy interface is the interface that is implemented by the proxy class. | | | Looking at the UML for the Proxy design pattern in Figure 1, you see that for the proxy to be useful and transparent, it usually needs to either implement an interface or inherit from a known superclass (with the exception of a facade, perhaps). | | | The proxy is a fundamental design pattern that is used quite often in programming. |
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http://www.javaworld.com/javaworld/jw-11-2000/jw-1110-proxy.html
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| | GoF Design Pattern:: Behavioural::Proxy |
| | Proxy object generally shares a common interface or superclass with the service- providing object, allowing a proxy object to substitutes the actual service-providing object. | | | A proxy object is an object that receives method calls on behalf of another object. | | | The Subject defines the common interface for RealSubject and Proxy so that a Proxy can be used anywhere a RealSubject is expected. |
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http://pages.cpsc.ucalgary.ca/~chi/SENG/609_04/ProxySummary.html
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| | SENG 609.04 |
| | Proxy pattern provides a solution to avoid creating all these expensive objects like large raster images at once when the document is opened. | | | The Proxy pattern can be applied when ever there is a need for a more versatile or sophisticated reference to an object. | | | Let's consider a document editor that can embed graphical objects in a document but when we try to open up a document do we want all the images to be loaded on the background or do we wait until that image is needed. |
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http://www.ucalgary.ca/~samulee/seng60904/proxy.html
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| | Design Pattern Questions |
| | A proxy pattern is used when we need to represent a complex object by a simpler one. | | | Thus a Proxy would simplify Subject code, by moving it to the RealSubject code, at the expense of implementing the Proxy code. | | | We could then use a behavioral pattern such as strategy to couple together a family of policies to be used depending on the classes. |
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http://www.cs.unc.edu/~aikat/courses/204/patterns
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| | SENG 609.04 - Proxy Pattern |
| | The proxy pattern can be useful in graphics where not all image objects are viewed and creating every object at startup can be expensive. | | | The proxy pattern could be useful also for maintaining a secure access to the object. | | | The Proxy pattern allows control over this by defining an interface to create the object on demand. |
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http://pages.cpsc.ucalgary.ca/~jadalow/seng60904/proxy.html
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| | JAVA DESIGN PATTERNS, Structural Patterns - Proxy Pattern |
| | The proxy pattern is used when you need to represent a complex with a simpler one. | | | Let’s try and understand this pattern with the help of a non-software example as we have tried to do throughout this article. | | | This simple object is called the “Proxy” for the complex object |
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http://www.allapplabs.com/java_design_patterns/proxy_pattern.htm
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| | design-nation.blog/en: An example of the proxy pattern |
| | And, depending of the kind of proxy, it can be also a good idea to make the proxy class implement also the same interface, so, if needed, it can be replaced. | | | That's why I consider this to be a proxy, more than an example of the state pattern. | | | The proxy class stores a reference to an object, that will be the real subject of the action. |
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http://www.design-nation.net/en/archives/000360.php
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| | Implementing the Proxy Design Pattern In .Net |
| | The Proxy design pattern shows a way to do just in time loading of objects that would consume too much memory to keep around, or takes a lot of time to load. | | | A good example of this pattern is in Microsoft Office. | | | We have added error handling in this function to allow for a finally block to null the object. |
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http://blogs.vbcity.com/jspano/articles/196.aspx
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| | Proxy |
| | A virtual proxy is a placeholder for "expensive to create" objects. | | | Both describe how to provide a level of indirection to another object, and the implementations keep a reference to the object to which they forward requests. | | | Checking that the real object is locked before it is accessed to ensure that no other object can change it. |
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http://home.earthlink.net/~huston2/dp/proxy.html
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| | proxy concept from the Object Oriented Software Engineering knowledge base |
| | The «Proxy» has the same interface as the «HeavyWeight», so programmers can declare variables without caring whether a «Proxy» or its «HeavyWeight» version will be put in the variable. | | | A related problem is this: If you load one object from a database or server, how can you avoid loading all the other objects that are linked to it. | | | has definition A pattern found in which a lightweight object stands in place of a heavyweight object that has the same interface. |
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http://www.site.uottawa.ca:4321/oose/proxy.html
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| | Take control with the Proxy design pattern |
| | In software, the Proxy design pattern proves useful in numerous contexts. | | | Note: In the first two installments of this column -- "Amaze Your Developer Friends with Design Patterns" (October 2001) and "Decorate Your Java Code" -- I discussed the Decorator pattern, which closely relates to the Proxy pattern, so you may wish to look at these articles before proceeding. | | | The Proxy design pattern substitutes a proxy for an object, making your apps more efficient |
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http://www.javaworld.com/javaworld/jw-02-2002/jw-0222-designpatterns.html
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| | Proxy Pattern |
| | A code example for a proxy is in this zip file. | | | The Proxy pattern can serve as an intermediary or substiture to make the interface for this class available, while providing a degree of control while enhancing or replacing certain functionality. | | | The client uses the interface to the proxy as if it were the interface to the target class, therefore the proxy should implement the same interface as the target class. |
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http://users.wpi.edu/~ppiselli/ProxyPattern.html
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| | TWiki . Javapedia . ProxyPattern |
| | The Proxy translates the client’s queries in remote calls, gets the results of the query from remote object and forwards them to the client. | | | It can answer itself on some client’s queries, such a getWidth() or getHeight(), without loading the image into the memory and it loads the image only if the image is really painted. | | | Virtual proxies create large expensive objects on demand. |
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http://wiki.java.net/bin/view/Javapedia/ProxyPattern
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| | [No title] |
| | If a large number of extrinsic states must be computed, the space savings occur at the expense of computation time. | | | State and strategy should often be implemented as Flyweights. ª ¦ ó ¨ The Flyweight Pattern: Costs ª ¨ó Flyweight introduces run-time costs associated with transferring, finding, and/or computing extrinsic states. | | | The game itself (Client) keeps track of extrinsic data of all soldiers, while the soldiers of the same type reference to the same object (ConcreteFlyweight) for any intrinsic data. ¡ ’ ’ ª. g ó ¨ Related Patterns ª ¨¦ Often combined with the Composite pattern to implement a directed a-cyclic graph with shared leaf nodes. |
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http://www.ucalgary.ca/~maheinri/443/TheFlyweightandProxyDesignPatterns.ppt
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| | [No title] |
| | This Proxy is used to access expensive objects, such as objects high in storage, access time, or another limit resource, created on demand. | | | But before doing so, the Proxy performs additional actions depending on the kind of Proxy. ¡Ì 3 2 “ 2 3 ‘ ªP < / i ] ó ¨ Proxy Pattern: Consequences ¨Z A Proxy pattern introduces a level of indirection when accessing an object. | | | A Virtual Proxy can perform optimizations like creating an object on demand. |
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http://www.darkpact.com/school/461/dp_proxy.ppt
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| | [No title] |
| | When implementing this pattern, it is highly recommended that the WS-I profile work be examined for implementation details in order to ensure maximum possibility for interoperability and conformance to standards. | | | This document is an instance of a pattern and is referenced via the Pattern Catalogue. | | | Easy to implement software packages, in most major programming languages must be present to support implementation of the service proxies on all platforms within the vertical ecosystem. |
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http://www.oasis-open.org/archives/ebsoa/200502/doc00006.doc
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| | Proxy Pattern |
| | The Proxy pattern was implemented in this project, simply because the client application needs to get information from an object which runs on a remote machine. | | | This is much more elegant that using Sockets to communicate between remote objects, as a protocol would have to be devised to parse the input and output. | | | Java's Remote Method Invocation(RMI) enables you to call methods on a proxy object, which forwards the calls to the real object on a remote machine. |
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http://www.redbrick.dcu.ie/~hego/technicalmanual/node18.html
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| | CMSC491D Design Patterns In Java |
| | Brad Appleton : Patterns and Software: Essential Concepts and Terminology | | | Stuart Maclean: An Alternative Structure For The Abstract Factory Software Design Pattern | | | Jim Waldo, et al : A Note On Distributed Computing |
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http://www.research.umbc.edu/~tarr/dp/fall00/cs491.html
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| | Proxy pattern |
| | representing a complex object by a simpler one called the "proxy" | | | proxy usually has same methods as real object | | | proxy takes method calls and passes them on to the 'real' object |
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http://www.cs.arizona.edu/classes/cs335/summer02/patterns/Proxy.html
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| | Java Pro Magazine - Automate SOAP Calls in Java with the Proxy Pattern |
| | When you're programming an application in which remote computers need to exchange objects over the Web—for example, an n-tier application in which the client sends requests to the server over HTTP—you have a choice of approaches. | | | and the proxy pattern to develop scalable applications | | | For a deployed solution, the database should be in a production-worthy relational database management system (RDBMS) like ORACLE or SQL Server.) In addition to automating the generation and parsing of XML, this application provides extra benefits, like caching of client requests and local debugging of SOAP services. |
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http://www.fawcette.com/javapro/2002_01/magazine/features/hbequet
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| | Proxy Pattern 1 of 3 |
| | Simple idiom - pointer is proxy for object | | | Motivation: Defer creation of expensive object using cheap proxy in its place | | | Purpose: Provide surrogate for object to control access |
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http://www.cse.ucsc.edu/~pohl/Winter01/Design2/tsld042.htm
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| | Provider Model vs. Proxy Pattern |
| | Obviusly the asp.net implementation includes some special code to deal with configuration files, but other than that - is the “Provider Model” just a new name on the proxy pattern...? | | | The proxy pattern implies that the object delegates all or some of its methods to another object (that is probably remote.) This assumes that the plugin (to steal from the above post :) provides a full implementation without delegating. | | | Rob introduced us recently to the provider model being implemented in V2; the similaraties of this description really reminded of the proxy design pattern. |
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http://weblogs.asp.net/kwarren/archive/2003/12/29/46523.aspx
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| | [No title] |
| | The Firewall pattern is also a special case of the Single-Point-of-Access. | | | I ó ¨ The Proxy-Based Firewall Pattern ª ¨á Related Pattern: The basic Address Filtering Firewall Pattern defines the packet filtering firewall model. | | | The Role-Based Access Control pattern, a specialization of the authorization pattern, is applicable if the networks and their access rules are respectively defined in terms of roles and rights. |
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http://www.cse.fau.edu/~security/public/FirewallPatterns.ppt
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