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Topic: Event driven

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	[No title] (Site not responding. Last check: 2007-10-20)
		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.
		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.
	www.ferg.org /projects/ferg-event_driven_programming.html (2572 words)

	Event-driven programming - Wikipedia, the free encyclopedia
		Inputs can be polled in the event loop, or interrupt handlers can be registered to react to hardware events; many systems use a mixture of both techniques.
		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 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.
	en.wikipedia.org /wiki/Event-driven_programming (561 words)

	Event Driven (Site not responding. Last check: 2007-10-20)
		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.
		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.
	www.macroanalytics.com /html/event_driven.html (235 words)

	Event-driven simulation (Site not responding. Last check: 2007-10-20)
		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
		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.
		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.
	www.winslam.com /laramee/sim (973 words)

	11.3 Application - Event-Driven Simulation (Site not responding. Last check: 2007-10-20)
		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.
		Events can be represented as subclasses of a base class, which we will call event.
		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 Applications
		Rather, as events occur, objects will issue messages to other objects to perform their responsibilities and the desired operations will be accomplished.
		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.
		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).
	www.public.iastate.edu /~abc/class/event.html (1468 words)

	Event-Driven Programming in LabVIEW - Tutorial - Developer Zone - National Instruments (Site not responding. Last check: 2007-10-20)
		When a system event occurs, the operating system is responsible for identifying and responding to the event.
		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.
		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.
	zone.ni.com /devzone\conceptd.nsf/webmain/E5F8474BDA20C97786256B5A0066968B?opendocument&node=dz00000_us (708 words)

	Moving to the Event-Driven Economy (Site not responding. Last check: 2007-10-20)
		The event must be logged so that it won't be forgotten if there is a failure as it is being processed.
		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).
		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)

	Events And JavaScript: Part 1 - Event Handling - The Web Developer's Journal
		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.
		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.
	www.webdevelopersjournal.com /articles/jsevents1/jsevents1.html (1629 words)

	Quantum Leaps Resources -- Glossary
		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).
		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”.
	www.quantum-leaps.com /resources/glossary.htm (5655 words)

	rwfPHP Framework (Site not responding. Last check: 2007-10-20)
		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.
		Events are the communication that welds the controls together.
		The event does not need to know of any specific instance of another control except that it is the kind of class that it expects.
	rwfphp.multispan.com (430 words)

	Event Driven Programming Systems (Site not responding. Last check: 2007-10-20)
		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)

	RFID Journal - Separating Wheat from Chaff
		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.
		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.
		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.
	www.rfidjournal.com /article/view/1196 (855 words)

	Event-driven servers
		First, the event delivery and handling mechanisms must be efficient and scalable.
		Finally, any changes in a server's environment should be reported to the server asynchronously; a server should never have to resort to a status poll on the resources it manages for correct operation.
		Perhaps most problematic, though, is that select() cannot be used to detect aio completion events, and the aio interface does not work with sockets.
	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
		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.
		Our event channel deals with a second type of hierarchy though, which is somewhat unique to the way we invoke event recipients.
		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)

	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 Applications Deliver Agility to Enterprise IT
		It may be an irrelevant event or an event of note.
		Some events require immediate attention; others are an indication of normal business operations.
		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)

	Complex Event Processing - David Luckham: Man of Events (Site not responding. Last check: 2007-10-20)
		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.
		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.
		Although this was originally developed for simulating integrated circuits, one of Luckham's conceptual leaps was to apply it to distributed enterprise systems.
	www.complexevents.com /history/manofevents.html (851 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 way in which events are handled within a page is specified using JavaScript.
		The simplest event handler is a button, which specifies an action to take place when the mouse is clicked on that button.
	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.
		The event that starts a workflow or triggers an Event node is the receipt of an XML message.
		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.
	e-docs.bea.com /wlintegration/v2_0/processintegrator/studio/apa.htm (837 words)

	Event Driven Programs
		The events may be generated by the operating environment, as happens with virtually all GUI programs or the program itself may go looking for events as is often the case in embedded control systems such as used in cameras etc.
		First we implement the event handler function that will be called when a keypress is detected then the main program body which simply starts up the event gathering loop and calls the event handling function when a valid event is detected.
		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.
	www.freenetpages.co.uk /hp/alan.gauld/tutevent.htm (1441 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)

	Complex Events (CEP) : CEP home page (Site not responding. Last check: 2007-10-20)
		dtabase transitions, time events, external signals) trigger the evaluation of a condition and if and only if the condition evaluates to true, the action is carried out.
		However, once the service provides a selection mechanism, then the overall efficiency of the service and its routing of notifications are affected by the power of the language used to construct notifications and to express filters and patterns.
		E"ECho is distinguished by efficient and flexible support for event typing and the ability to assign event handlers to specific threads for transparent support for both inter- and intra- process communication."
	cep.weblogger.com (4656 words)

	Event-Driven Architecture: The Next Big Thing by KnowNow - A Vendor White Paper - InfoWorld Product Finder (Site not responding. Last check: 2007-10-20)
		Events are based on notification, a decoupled type of communication that is more scalable and flexible than loosely coupled or tightly coupled interactions.
		Imagine a world where every new application emits a continuous stream of messages that record every significant action, regardless of whether the use of that data is known when the application was built.
		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)

	Trafford Publishing: Stock Market Trading: The Event Driven Method
		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.
		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.
		They are driven by the two extremes of FEAR and GREED.
	www.trafford.com /robots/03-1225.html (1688 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)

	Event-Driven Design Support (Site not responding. Last check: 2007-10-20)
		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.
		To integrate disk events with memory-to-memory NIC event handling, a generalization of the network-specific completion group abstraction is needed.
		Events from network and disk sources can be uniformly handled using kqueue [13], a recently introduced FreeBSD kernel abstraction for scalable event handling.
	www.eecs.harvard.edu /~magoutis/bsdcon02/html/node9.html (305 words)

	Event-driven services in SOA
		Responding to real-time changes and events in a timely manner is becoming one of the most important requirements for an enterprise framework.
		Event consumers subscribe to an intermediary event manager, and event producers publish to this manager.
		When the event manager receives an event from a producer, the manager forwards the event to the consumer.
	www.javaworld.com /javaworld/jw-01-2005/jw-0131-soa.html (974 words)

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