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Topic: Dynamic dispatch

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	Take a BrainSip (Site not responding. Last check: 2007-10-13)
		In computer science, dynamic dispatch is the process of mapping a message to a specific sequence of code (method) at runtime.
		Dynamic dispatch is only used for code invocation and not for other binding processes (such as for global variables) and the name is normally only used to describe a language feature where a runtime decision is required to determine which code to invoke.
		The choices of the Dynamic dispatch mechanism offered by a language to a large extent alter the programming paradigms that are available or are most natural to use within a given language.
	dynamic-dispatch.mestskadoprava.sk (699 words)

	[No title]
		Dispatching Techniques Object-oriented languages require the ability to DISPATCH at run time, i.e., to find the code that implements an operation for a given object, when that may not be known at compile time.
		Oversimplified C++ Function Dispatching The (over-)simplified idea of C++ function dispatching (which nobody actually uses to implement C++) is that a method of an object is actually a field of the object, which is just a function pointer to the code for the method.
		Since dynamic typing is also available, the compiler must emit type-checking code in cases where the value being assigned to a variable (or passed to a procedure or method) cannot be statically determined to be of the right type.
	www.cs.utexas.edu /ftp/pub/garbage/schnotes/dispatch.txt (6331 words)

	[No title]
		Dispatch occurs when procedure to be invoked depends not only on the procedureÕs name but also on the type of at least one of the arguments to the procedure.
		Dynamic dispatch is then required if the amount of local information is insufficient to determine the specific type of entities.
		Dynamic Dispatch Dynamic dispatch occurs if the local information is insufficient to statically determine the detailed types of all the entities that are nominally arguments to a procedure.
	members.aol.com /wclodius/97-119.txt (3372 words)

	FMPro.org - Dynamic Dispatch, Ocean West Consulting Inc.
		Dynamic Dispatch is a cross platform FileMaker® solution for service oriented business who need to schedule and dispatch technicians.
		Dynamic Dispatch replaces the conventional white boards, or grease pencils.
		The developers of Dynamic Dispatch welcome the opportunity to work with a service oriented business to serve as a beta test site to aid in the development of this powerful solution.
	www.fmpro.org /news/153052684386/dynamic-dispatch.html (352 words)

	Tigerpaw Software - Dispatching
		Simply put, the Dispatch Board is used to schedule tasks for technicians, make scheduling adjustments on the fly, and quickly assess the workload of one or more technicians on your team.
		In your organization, several factors may be used to determine which technician gets dispatched to which location – severity of the request, status and location of the customer, technician availability and capability, and time of day all may play a part.
		Tigerpaw’s Dispatch Board is the ideal tool for viewing, organizing, and optimizing your scheduling process; it helps you turn service dispatching into a well-oiled – and profitable – machine.
	www.tigerpawsoftware.com /products/dispatch.asp (443 words)

	Dynamic Dispatch (Site not responding. Last check: 2007-10-13)
		Predicate dispatch [ErnstKaplanChambers-ECOOP-98] provides a generalization of other method dispatch techniques through the utilization of arbitrary predicates to control method applicability and logical implication between predicates to determine method overriding.
		An efficient predicate dispatch implementation technique [ChambersChen-OOPSLA-99] involves reducing general predicate dispatch into multidispatch using a canonicalization process, mapping multidispatch onto a sequence of single dispatches through the construction of a decision DAG, and finally implementing single dispatch in terms of a binary search.
		Dylan provides a rich set of built-in types and a powerful multimethod dispatch mechanism that present several challenges to the predicate dispatch mechanism and its implementation.
	www.ai.mit.edu /projects/dynlangs/Talks/multimethod-dispatch.htm (200 words)

	Principles of Programming Languages: Lecture 9
		In the programming languages literature, the term dynamic binding is often used as a synonym for dynamic binding but this terminology is misleading and should be avoided.
		Dynamic binding is also used to refer to the binding mechanism using to support dynamic scope, the semantically obscene alternative to the lexical scoping rules used in programming languages like Scheme, ML, Haskell, Java, and even Algol-like languages such as Pascal to determine the meaning of free variables in procedures.
		In class-based object-oriented languages, fields cannot be dynamically added to objects during program execution; the class definition completely determines the form of an object of that class.
	www.cs.rice.edu /~javaplt/311/Notes/01/9.html (1206 words)

	: Transcript: CLR Method Dispatch Internals - From Static to Dynamic
		So dynamic method is a new class in the 2.0 framework and it basically gives you the ability to dynamically generate code on the fly.
		Dynamic method with a.method invoke is basically just a little bit – actually that’s probably not right, it’s more like that.
		Okay, so what I’ve got here is a simple dynamic method factory and I’m going to set this up very quickly by saying I want a dynamic method from the dynamic method factory and I want it for this particular method and I’ve described that method using the method info that I’ve found before.
	msdn.microsoft.com /msdntv/transcripts/20051103CLRJPTranscript.aspx (5120 words)

	Dynamic dispatch - Wikipedia, the free encyclopedia
		Although the overhead involved in this dispatch mechanism is low it may still be significant for some application areas that the language was designed to target.
		Type overloading does not produce dynamic dispatch in C++ as the language considers the types of the message parameters part of the formal message name.
		It is possible to alter the Smalltalk message dispatcher to allow instance behaviour, but this is not normally done as it would make the message dispatch even less efficient.
	en.wikipedia.org /wiki/Dynamic_dispatch (801 words)

	[No title]
		This problem does not exist to such an extent in "impure" OO languages such as C++, where dynamic dispatch is not as heavily used.
		To see this, note that a dispatch to f() on type X invokes the method f() defined in class X and not any parent class.
		As an aside, compilation techniques that are part static/part dynamic are a promising way of resolving many problems that are combinatorially too expensive for pure static techniques.
	www.cs.berkeley.edu /~aiken/cs264/lectures/method_spec (827 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		Dynamic Dispatch means that the binding of the method is determined at run time depending on the type of the object pointed to by pa.
		That is, the default in Java is that methods are bound dynamically according to the type of the object referenced at run time, but if the method is declared final, the binding is static.
		Although dynamic dispatch means that the method called will be determined by the run time, the compiler must still generate code that when executed at run time will determine the correct method implementation based on the run time type of the object.
	condor.depaul.edu /~glancast/447class/docs/lexMay25.html (2740 words)

	Dynamic Dispatch and Reuse
		In single-dispatch languages like C++ and Java, dynamic dispatch can be implemented by associating, with each object, a table of pointers to the code for each of the object's methods.
		Note that it is possible for the programmer to implement dynamic dispatch in non-object-oriented languages that allow pointers to functions, such as C. However, this requires that the programmer undertake the tedious and potentially error-prone task of initializing using the tables of function pointers.
		However, we do not believe that every new use that requires dynamic dispatch should be considered a redesign: If this were the case, the author of a class would have the responsibility of enumerating all cases in which dynamic dispatch is needed for objects of that type.
	www.usenix.org /publications/library/proceedings/coots01/full_papers/wonnacott/wonnacott_html/node2.html (1207 words)

	ongoing · Dynamic Java
		It’s pretty clear that dynamic languages are a hot area, maybe the hottest, in the world of software development.
		Lesson: Dynamic Dispatch · The semantics when you do a Java-to-Java method dispatch are a lot more subtle and complex than you might think, but they’re all handled by the compiler and the JVM apparatus and it’s super-efficient.
		Dispatching from Groovy to Jython to Java and back is a lot more complicated, and the Groovy and Jython guys have had to write tons of code to figure out which method to call and get all the arguments in order and make the dispatch happen.
	www.tbray.org /ongoing/When/200x/2004/12/08/DynamicJava (1214 words)

	DRI Wiki - GLdispatch (Site not responding. Last check: 2007-10-13)
		Once the location of the function pointer in the dispatch table is known, Mesa generates a dynamic dispatch stub for the function.
		The name of the function, the assigned offset, and the dispatch stub pointer are all stored in a table used internally by Mesa.
		The name of the dispatch table pointer is changed in the TLS case to prevent conflicts between a TLS libGL and a non-TLS DRI driver.
	dri.freedesktop.org /wiki/GLdispatch (1049 words)

	COOTS 2001 Paper
		Object oriented languages generally include some form of dynamic dispatch; that is, in the absence of precise compile-time type information, they perform a run-time selection of the appropriate function body (or method) from a set of candidates.
		We show that this conflict is a consequence of the restriction of dynamic dispatch to the receiver object.
		On this evidence, we argue that dispatch technique should be decoupled from membership in a class and access to its representation.
	www.usenix.org /publications/library/proceedings/coots01/full_papers/wonnacott/wonnacott_html/index.html (169 words)

	Dynamic Dispatch - Multiple Polymorphism in Java
		Dynamic Inheritance is the ability of an object to inherit classes at runtime and provides several key abilities.
		Dynamic inheritance solves the problem by not requiring a new class for any number of combinations between any number of class or interface hierarchies.
		Dynamic inheritance in DynamicDispatcher typically uses a class or several classes as dynamic superclasses, however objects may also be used achieving a very powerful object-oriented delegation model.
	www.objectfaq.com /oofaq2/DynInh.htm (887 words)

	Current Trucking Industry News: TruckingInfo.com : Your Source for Trucking Information and News
		Dynamic Dispatch will be offered as an optional feature to enhance FleetDirector's benefits by simplifying dispatcher-to-driver communications.
		Teletrac's FleetDirector system enables metropolitan and regional dispatchers to view the location of vehicles in real-time over maps on their computer screen, eliminating the need to manually radio each driver to determine his location.
		Dynamic Dispatch streamlines the driver's and dispatcher's day-to-day communications by reducing the number of key strokes necessary for both parties to communicate job information.
	www.truckinginfo.com /news/news-detail.asp?news_id=50522 (486 words)

	Dynamic Object Composition Using IDispatchEx (Site not responding. Last check: 2007-10-13)
		These object models are dynamically built from the elements in the Web pages themselves, giving the programmer full access to any edit boxes or radio buttons on the page.
		It also allows the consumer of an object to add dynamic data or behavior to the object that is context-specific or determined at runtime.
		Any dynamic dispatch entries that are from a child interface are invoked using the ITypeInfo:: Invoke method.
	www.microsoft.com /mind/1099/dynamicobject/dynamicobject.asp (2869 words)

	Multi-Dispatch in the Java Virtual Machine: Design and Implementation
		The latter case is known as dynamic dispatch (dynamic method overriding or virtual functions) and object-oriented languages leverage it to provide polymorphism -- the execution of type-specific program code.
		Another common use for double dispatch is in drag-and-drop applications, where the result of a user action depends on both the data object dragged and on the target object.
		If a dispatcher has not been instantiated, and the just-loaded class is uni-dispatch only, we defer the registration in order to reduce the overhead to uni-dispatch programs.
	www.cs.ualberta.ca /~paullu/Papers/COOTS2001-HTML/mdj.html (8431 words)

	CSAIL Research Abstract
		Dynamic dispatch selects which implementation of a method to invoke, based on the run-time class of the receiver object.
		The dynamic type is stored in a dynamic object upon creation and is permitted to change subsequently.
		Predicate fields were particularly useful in providing a uniform interface to an arbitrary (and dynamically changing) number of possible object structures, which was achieved through a combination of reflection and treating dynamic objects (created by the library) as real objects.
	publications.csail.mit.edu /abstracts/abstracts05/artzi/artzi.html (2504 words)

	GOF Design Patterns in a Dynamic OO Language (Site not responding. Last check: 2007-10-13)
		Each pattern is presented with a description of the design problem the pattern addresses, as well as sample implementation code and design considerations.
		Dynamic Dispatch: When a generic function is called, it selects the most applicable method based on matching the types of the arguments against the specializers of each method.
		This is multiple dispatch, as opposed to the single dispatch of C++, Java, Smalltalk, etc. GLOS also supports method combination (before, after, and around) methods.
	people.csail.mit.edu /gregs/ref-dyn-patterns.html (295 words)

	Dynamic Dispatcher Homepage
		A Dynamic Dispatcher is a replacement for applying the VISITOR design pattern.
		For performance critical applications (e.g., when millions of invocations have to be dispatched), this library provides on the fly byte compiled dispatcher classes.
		The default, reflection based dynamic dispatcher already has a quiet good performance and should not produce real overhead in many situations.
	dynamicdispatch.sourceforge.net (886 words)

	SmallEiffel The GNU Eiffel Compiler : " Research papers " (Site not responding. Last check: 2007-10-13)
		Moreover, when dynamic dispatch cannot be removed, inlining is still possible.
		Dynamic dispatch is implemented without any array access but uses a simple static binary branch code.
		Some more dispatch sites are removed after the type inference algorithm has been performed, if the different branches of a dispatch site lead to the same code.
	smalleiffel.loria.fr /papers/papers.html (784 words)

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