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Event-driven programming - Wikipedia, the free encyclopedia A command driven system can be viewed as a special case of the event driven model in which the system, inactive, awaits one very complex event--the entry of a command by the user. Event-driven programs typically consist of a number of small programs called event handlers, which are to be called in response to external events, and a dispatcher, which calls the event handlers, often using an event queue to hold unprocessed events. Programming an event driven system is thus a matter of rewriting the default trigger functions of the system, to match the required behavior. www.wikipedia.org /wiki/Event-driven_programming   (561 words)

ferg-event_driven_programming.html The event loop is a process in which the agent continually watches for events. The Agent, with its event loop, is now the party that is really in control, and it uses the main module merely as a container for the "helper" event-handler routines that it calls. When you register an event handler, you are telling (a) the agent that when (b) an event of a particular type occurs, the agent should send information about that event to (c) a particular event-handler routine. www.ferg.org /projects/ferg-event_driven_programming.html   (2572 words)

Event Driven Event driven funds can sustain correlations with the major market indices as predefined "events" can become more scarce during times of range-bound markets and volatile environments can lead to large losses or equally large gains. As the name implies, hedge funds employing an event driven strategy take positions based upon their expectations about some event that has or is expected to occur. However, typically both risk and returns tend to be higher then the norm as the success of an event driven funds rests upon the manager(s) ability to read an event situation accurately or employ a model which is capable of doing such a task. www.macroanalytics.com /html/event_driven.html   (235 words)

Event-driven simulation If events aren't guaranteed to occur at regular intervals, and we don't have a good bound on the time step (it shouldn't be so small as to make the simulation run too long, nor so large as to make the number of events unmanageable), then it's more appropriate to use an event-driven simulation. We don't generate all the events in the list at the beginning (this would be analogous to knowing the entire sequence of states of the simulation at the outset). Certain events may be handled by scheduling later events, which are inserted at the appropriate place in the event list. www.cs.toronto.edu /~heap/270F02/node54.html   (281 words)

Event Driven Simulation Tutorial If only 50 of these events actually occur, it is still necessary to examine all 1000 "units of time" in the exhaustive simulation, whereas in the event driven simulation, you only examine the 50 changes of state to the system resulting from events occurring to/in that system. Event driven simulations lend themselves so well to network protocol simulations because to quantify time - so that the simulation can exhaustively look at every distinct moment of time - results in such a large amount of processing overhead that the simulation takes far too long. For example, if there is a possibility that system loading is such that there could be 1000 events in a second, then "time" must be quantified into pieces each 0.001 seconds long, and each of these 1000 units of time must be examined during the simulation to see if an event has occurred. www.winslam.com /laramee/sim   (973 words)

Moving to the Event-Driven Economy What is of note here is that all relevant systems are notified of the event and are supplied with all appropriate information, in real time, so that they can, in turn, instantly react to the event (see Figure 1). The event must be logged so that it won't be forgotten if there is a failure as it is being processed. Of equal relevance is that all systems participating in the event will be notified instantly if any change occur along the supply chain—that is, if demand changes (for example, car sales are down) or if there is a parts shortage. www.informit.com /articles/article.asp?p=19736   (1377 words)

Trafford Publishing: Stock Market Trading: The Event Driven Method Event driven trading means simply that you are waiting on a set of events that you want to happen before you purchase a stock, is the stock is blasting into and out of its pivot point from a good pattern. With this book you will be able to find main events in a stock's history right up to the current time to let you know if this is a stock to purchase and when, or to leave it alone. They are driven by the two extremes of FEAR and GREED. www.trafford.com /robots/03-1225.html   (1688 words)

Weblogs Forum - Why Are Event Driven APIs Difficult? Event Driven API's also tend to be more loosely coupled.  If you consult this table you realize that it supports two properties. In summary, Event Driven API's are more difficult to program in simply because imperative languages were not designed for them.  The use of both Generators and Grammar based approaches should make it much easier.  The main benefit of an event driven style is better scalability and a loosely coupled approach. In event-driven programs the program must respond to whatever the current state is when an event occurs. www.artima.com /forums/flat.jsp?forum=106&thread=8343   (544 words)

Event-Driven Programming in LabVIEW - Tutorial - Developer Zone - National Instruments In addition, you can use the Event structure to handle events such as exiting the application or resizing a window, which are unavailable when you use polling. In contrast to polling, the Event structure does not lose user events because the structure uses an event queue to store user events and handle the user events in the order in which they occur. When a system event occurs, the operating system is responsible for identifying and responding to the event. zone.ni.com /devzone\conceptd.nsf/webmain/E5F8474BDA20C97786256B5A0066968B?opendocument&node=dz00000_us   (708 words)

Events And JavaScript: Part 1 - Event Handling - The Web Developer's Journal The event occurs when either of the form elements is given the focus, and the situation is reinforced by the question being repeated in the status bar. For example, a leaf hitting the bus is an event, but is not a significant event if we wish to model the cost effectiveness of the bus route. One of the properties of the event object is the srcElement property, which contains the element that initiated the event. www.webdevelopersjournal.com /articles/jsevents1/jsevents1.html   (1629 words)

Event-Driven Applications Rather, as events occur, objects will issue messages to other objects to perform their responsibilities and the desired operations will be accomplished. In the examples, ABC processed events one at a time, but it was built to allow for the execution of simultaneous tasks (or seemingly so). For this play, it is assumed that there is an event queue which will hold events as they are generated by the mouse and keyboard. www.public.iastate.edu /~abc/class/event.html   (1468 words)

Event Driven Programming Systems The destination for an event may be determined by a state variable such a mouse location or by an event handler having registered itself as a recipient for the particular event. Event handlers correspond to objects, and the processing routines to methods or members functions. Event handlers can be specified using a combination of text and graphics. www.sju.edu /~jhodgson/gui/event.html   (137 words)

11.3 Application - Event-Driven Simulation Events can be represented as subclasses of a base class, which we will call event. This queue is stored in order, based on the time the event should occur, so the smallest element will always be the next event to be modeled. The first is used to insert a new event into the queue, while the second runs the simulation. www.ccd.bnl.gov /bcf/cluster/pgi/pgC++_lib/stdlibug/app_4189.htm   (967 words)

Event-driven programming - Wikipedia, the free encyclopedia Event-driven programs typically consist of a number of small programs called event handlers, which are to be called in response to external events, and a dispatcher, which calls the event handlers, often using an event queue to hold unprocessed events. A command line interface can be viewed as a special case of the event driven model in which the system, which is inactive, awaits one very complex event--the entry of a command by the user. Programming an event driven system is thus a matter of rewriting the default trigger functions of the system, to match the required behavior. en.wikipedia.org /wiki/Event-driven_programming   (556 words)

Event driven programming language - Wikipedia, the free encyclopedia An event driven programming language is a programming language in which events (mouse clicks, key presses) cause portions of the code to execute. The third step in developing an event-driven program is to write the "main loop": a function that checks for events, and then calls the matching event handler. The first step in developing an event-driven program is to write a series of subroutines, or methods, called event-handler routines. en.wikipedia.org /wiki/Event_driven_programming_language   (365 words)

Lesson 7: Event-driven Programming In other words, Web pages are "event-driven," reacting to events that you initiate such as mouse clicks or keyboard entries. The simplest event handler is a button, which specifies an action to take place when the mouse is clicked on that button. The way in which events are handled within a page is specified using JavaScript. www.dickinson.edu /~braught/courses/cs131s04/Spring2004/Lessons/07-Events.html   (1785 words)

Understanding Event-Driven Processing An event is an asynchronous notification from another workflow or from an external source, such as another application. An event key is a value that must match an element in the incoming XML document before BEA WebLogic Process Integrator starts the workflow or triggers an Event node. The event that starts a workflow or triggers an Event node is the receipt of an XML message. e-docs.bea.com /wlintegration/v2_0/processintegrator/studio/apa.htm   (837 words)

Event-Driven Architecture: The Next Big Thing by KnowNow - A Vendor White Paper - InfoWorld Product Finder Event-driven design is a fundamental requirement of pervasive computing and agility. Events are based on notification, a decoupled type of communication that is more scalable and flexible than loosely coupled or tightly coupled interactions. Events have been underutilized in high-level business application design, in part because many developers are unfamiliar with them. productfinder.infoworld.com /infoworld/search/viewabstract/75388/index.jsp   (432 words)

Event-Driven Design Support Events from network and disk sources can be uniformly handled using kqueue [13], a recently introduced FreeBSD kernel abstraction for scalable event handling. To integrate disk events with memory-to-memory NIC event handling, a generalization of the network-specific completion group abstraction is needed. The latter mechanism is more efficient as it avoids overhead associated with multithreading but can only be used for applications using raw device access, such as relational databases. www.eecs.harvard.edu /~magoutis/bsdcon02/html/node9.html   (305 words)

rwfPHP Framework The main goals of rwfPHP is to speed development through the use of a simple event driven model, reuse of code through web controls, and separation of presentation and logic layers through the use of templates. The simple event driven model is to help speed the learning curve of window’s application developers. The rwfPHP framework is a set of Object Oriented classes that allows development of Object Oriented Event driven web applications. rwfphp.multispan.com   (430 words)

Quantum Leaps Resources -- Glossary UML statecharts don’t support event conjunction, and the semantics is given in respect to a single event dispatch, to better match the type context as opposed to a general system context. However, if state “s11” does not prescribe how to handle the event, the event is not quietly discarded (as in a classical finite state machine); rather, it is automatically handled in the higher level context of state “s1”. Boolean condition of extended state variables (and perhaps event parameters) that affect the behavior of a state machine by enabling or disabling certain operations (e.g., change of state). www.quantum-leaps.com /resources/glossary.htm   (5655 words)

Event-Driven Applications Deliver Agility to Enterprise IT The key difference between conventional business processes and a new generation of improved business processes is that the new processes are event-driven. Service-oriented architecture is increasingly used for internal IT projects, but, in business-to-business scenarios, the separated logical unit of work and one-way trading-partner interactions usually favor event-driven design. Capturing the events as they occur and interpreting their meaning in real time are the key capabilities of a real-time enterprise. www4.gartner.com /pages/story.php.id.8911.s.8.jsp   (413 words)

Jon Udell: The Event-Driven Internet Event notification has been a longstanding research interest of KnowNow's founders, Rohit Khare and Adam Rifkin, so it's not surprising that pub/sub is a central feature of their system. In the case of Kenamea, the only way to receive events is to run a local instance of Kenamea's version of an event router, which is called the harness. Of more general interest is the notion of a computing fabric in which processes subscribe to events, are notified of changes, and then take appropriate actions. udell.roninhouse.com /bytecols/2001-11-26.html   (1582 words)

Serial Communication for WIN32 (Event-driven) This event is generated when the data you want to transmit have been passed to the device driver (this doesn't mean that they reached the other side of the serial cable). This event is generated when a RING occurs on your telephone line (if you have a modem and if you specified to notify modem's events). This event is generated when the modem is connected to the other modem (for example after an "ATDT" command). www.tetraedre.com /advanced/serial2.php   (1541 words)

Event-driven servers First, the event delivery and handling mechanisms must be efficient and scalable. Perhaps most problematic, though, is that select() cannot be used to detect aio completion events, and the aio interface does not work with sockets. This forces an application to use cumbersome methods to wait simultaneously for network and disk events. www.cs.wisc.edu /~cao/WISP98/html-versions/gaurav/paper/node5.html   (463 words)

Look Ma -- No Middleware! Using Event-Driven Architectures inside a JVM. - Enterprise Integration Patterns Our event channel deals with a second type of hierarchy though, which is somewhat unique to the way we invoke event recipients. We targeted the second problem by processing user events as they occur instead of waiting for all events to be collected first before starting to compute aggregated values. The next stage is a set of Message Translators that use both the context data and the event data to compute basic scores. www.eaipatterns.com /ramblings/14_edainjvm.html   (2208 words)

RFID Journal - Separating Wheat from Chaff As event volume and velocity grow, these EPN architectures will be critical to building RFID systems that can be expanded to handle massive amounts of data from thousands or even tens of thousands of readers. So the job of CEP is to take simple event-oriented data, apply sets of event processing rules to those events in real time, and, through that processing, determine which complex events companies need to act on. CEP is a method of aggregating large amounts of information in a database that uses Event Query Language (EQL) to sift through the data for meaningful information. www.rfidjournal.com /article/view/1196   (855 words)

Complex Event Processing - David Luckham: Man of Events The Power of Events is based on years of research work at Stanford and two years as CTO of a software start-up working in the field. For the first year after David Luckham's book, The Power of Events, was published in 2002, it did what most technical books do: disappeared into the academic ether. As a result, Luckham, who has been both a distinguished academic and a software entrepreneur in his long career, has suddenly found himself the centre of attention, enabling him to embark on a new career. www.complexevents.com /history/manofevents.html   (851 words)

Event Driven Programs Creating an application class is quite common in OO event driven environments because there is a lot of synergy between the concepts of events being sent to a program and messages being sent to an object. Recall that programs can be batch oriented, whereby they start, do something then stop, or event driven where they start, wait for events and only stop when told to do so - by an event. This Independence of event capture and processing is a key feature of event driven programming. www.freenetpages.co.uk /hp/alan.gauld/tutevent.htm   (1441 words)

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