Parameter passing is used by a function, it allows a value to be passed through a program, it can be used for many things, including an alarm or finding a certain character at a certain position, though on an alarm, the event doesn’t take place until a certain time has come, this is due to events. For example when a user performs a mouse click, press a key on keyboard or interact with the system with any other input method. Service oriented is a key features in event-driven programming that used to write programs that are made for services and it takes does not slow down the computer as service oriented only consume little of the computer processing power and usually services run in the background of OS. An event is an action that can be reacted to. Messages are removed from this queue in the order in which they are received – that is, the first task added to the list will be the first task taken off and processed. Key Features of Event Driven Programs November 20, 2014 viktoriyafraser Leave a comment Within this blog post I will be explaining the Key Features of Event Driven Programs, discussing how an operating system can be viewed as an even driven application and evaluating the suitability of event driven programs for non-graphical applications. Create a free website or blog at WordPress.com. It will include everything from examples of an Event driven program, Simple architecture of how an event driven program operates. The event can be anything however it's normally human input e.g. m.Age(); The primary part of an event driven programming is a "scheduler". An event is an action that can be reacted to. The easiest example to understand is the USB device recognition service on a modern PC. Like "JOptionPane". Event-loop is a functionality to handle all the events in a computational code. For this, we can use a timer that raises an event (e.g. An example of this is MAC OS X mavericks, it checks for updates at a specific time every day, if an update is found it informs you to do the update now or to postpone it to a later time or date. An example of a programming library is import,.javax.swing. Event handler is a  function or method that takes place when a certain event happens, they are executed in response to a certain event that takes place, for example this could be on a button, when a button is clicked the code is ran, if the button is clicked again after that it will run again, this is an event handler. Another key feature of event driven programming is time driven, programs which are time driven such as antivirus scans or an operating systems updates are very important features for maintenance and the running of your pc in general. sName=’Zakk’; Event-driven programming is the dominant paradigm used in graphical user interfaces and other applications (e.g., JavaScript web applications) that are centered on performing certain actions in response to user input. System.out.println(“The letter at position 0 is: ” cPosition); Local variables: int main(){ int year; Definition and Context. Principles of Event Driven Programming: Event-driven programming is a programming approach in which events decide the flow of program execution. int newyear = year + 1; sSurname=”Cuthbert”; If something is requested, the action is carried out, if a user wanted to minimize an application that they are using, they would click on the – icon in the top right of the page and the application will minimize into the task bar, this is service orientated. B: Time driven programming is known as a programming paradigm, where the control flow of the computer program is driven by a clock. Basically an event handler is a part of the event driven program fashioned to tell the event driven program in how to take action in reaction to a specific event. Procedures are a set of tasks, that can be carried out in an order, they can be used to carry out certain actions. It requires fewer coded decisions than console applications. There are many different programming libraries, they contain pre-compiled routines, this can be source code, data files, script, templates, fonts or code form. Pre-defined functions: A typical pre-defined function would usually be an instruction that is identified by a name (an example would be “charAt()” which is a pre defined function that searches for a characters position in a string). char cPosition; The time driven feature in event driven programming runs a specific code on a timely basis like once an hour, once a week or once a month meaning it is pre set to do a task on a time trigger. These events are usually from … Pre-defined functions: Many events are determined by user actions instead of advance coding of all possible scenarios. When a program is modular, it doesn’t need every different part to actually function, and things can be deleted without getting loads of errors, this is because everything works independently. cPosition=sSurname.charAt(0); ( Log Out /  Key Features of Event Driven Programs. } Event driven programming is all service orientated, when a user interacts with an event driven program then the program provides the user with a service. The languages used for event driven programming and how they compile together with other features to create a professional, well designed, bug free, Event driven program with a … The parameter in this piece of code is .charAt(0); as the parameter goes between the brackets. In this blog post I will be covering the key features of event driven programming, this includes service orientated, time driven, event handlers, trigger functions, events, pre-defined functions, local variables, global variables, parameter passing, modularity, procedures, programming libraries, event driven programming paradigm for simplicity of programming and ease of development … EDP shares some features with OOP that include the use of variables, procedures, classes and objects. ( Log Out /  2 examples of languages using Event driven programming The first language and the one we have really focused on is Java this is great for doing graphically user interfaces as you will see in the example. Service orientated: Time driven: Programming Paradigms Essay A programing paradigm is a logical... Summary : ' Handout Programing Paradigm ' A Style Of Programing Essay. While traditional programming is linear and based on the flow of execution, with operations running for a fixed span or until reaching pre-written decision points, event-driven programming progresses as triggered by certain events (e.g., clicking on the mouse, pressing some keys on the keyboard, selecting an option from a drop-down menu). Programming libraries: age = age + 18; Key Features of Event Driven Programs. Service orientated: Service oriented is a programming paradigm that is used to write programs that are made for services. Service oriented. Time driven: Event handlers: Trigger functions: Events(Mouse, keyboard and user interface): Pre-defined functions: Local variables: Parameter passing: For the events within a program to happen, they need to be triggered, this is when the user interacts with an object, which may be a button getting clicked by a mouse, events can be triggered in may different ways, it can be with your mouse, due to movement, left clicking, right clicking or scrolling, the keyboard can also be used to set off events, this can be from pressing certain keys, holding down certain keys or from something being typed into the keyboard. Examples of events include mouse clicks, key presses, data input from sensors, messages being sent from other programs and so on. Consider the code below: Copyright © 2021 | WordPress Theme by MH Themes, Unit 2 – Fundamentals of Computer Systems, Unit 7 – IT System Security and Encryption, There is no point in scanning the USB devices constantly. Events(Mouse, keyboard and user interface): String sSurname; The event handler is the block of code that is intended to run in response to an event. Event driven programming is considered one of the most used paradigms for graphical interfaces, and they would be centered for the application of user inputs. Say you want a message to appear when a button is clicked: the button being clicked is the event, and the event handler is the code that makes the message appear. This approach to software coding possesses numerous advantages for all stakeholders. The events happen due to code being assigned to something, for example code might be assigned to a button, so when that button is clicked the code is executed. Service Oriented Processing refers to background services running on a system, that are awoken by events. Using import,.javax.swing. Second, it removes the possibility of invalid value entry. The event loop is an operating-system supplied piece of code that loops round, checking the message queue, and processing messages when they arrive. *;" would import a library that you use but not define. main m = new Main(); Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. When the users requirements are met e.g an alarm going off at a certain time. int age = 0; Global variables: While console-based apps act, event-driven apps react. Programming libraries are specific pre-defined libraries in programming that can be imported into your code to add new features. String sName; For example when a device is plugged into a USB port the computer will attempt to locate the driver for the device that has been plugged in this would then allow the device to be used. Unit 14 ass1- event driven programming . A pre-defined function is a function that is built into the programming language, for example system.out.println is used injava, this is a pre-defined function, You can also use Java or C# for event driven programming. a mouse click. The 10 Features of Event Driven Programming There are 10 major features of event driven programming. An alarm clock needs to check whether the time is a certain value, but it only needs to check relatively infrequently, for example once a second. The most common actions are mouse clicks and key… } Firstly I am going to start with the event handler feature of event driven programming. Examples of Languages that use event driven programming: Programming libraries usually are a collection of routines. *; allowed me to gain access to a specific library, this allowed me to use the functions that were built into that library. When a USB device is attached or removed, an event is raised and dispatched to the software service, which enables interaction to determine, amongst other things, what action to take with the new device. A console-based app asks a question and allows the user to type the answer. Event-driven programs can be written in any programming language, and almost all object-oriented and visual languages support event-driven programming, including Visual Basic, Visual C++ and Java. The event loop is a queue data structure, and it contains a list of events that have been raised, along with any relevant data (for example the x and y coordinates of a mouse click). Procedures: public void Age() { The Object oriented programming makes it easier to the programmers to design and organize software programs. 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