terminology

I am learning Spring and the term "Spring Container" frequently shows up in the text. However, I know "container" is not used only in Spring (EJB container etc) so what does it mean when used in the context of programming? The container is something that contains something else. In spring : Spring container contains beans (Java objects that are subject to dependency-injection ) Servlet containers contain servlets, filters, listeners, etc. and manages their state and lifecycle. There are also similar portlet containers EJB containers contain EJBs (stateless, stateful, message-driven) and, as

I'm reading a document that talks about a method having a receiver. What's a receiver? In Ruby (and other languages that take inspiration from SmallTalk) objects are thought of as sending and receiving 'messages'. In Ruby, Object, the base class of everything, has a send method: Object.send For example: class Klass def hello "Hello!" end end k = Klass.new k.send :hello #=> "Hello" k.hello #=> "Hello" In both of these cases k is the receiver of the 'hello' message. In the original Smalltalk terminology, methods on "objects" were instead refered to as messages to objects (i.e. you didn't call a

What is the difference between a port number and a protocol number? You can think of a port as a phone extension, with the computer's IP address being like its phone number. You can call the number (IP address) to talk to the computer, then dial the extension (port) to talk to a specific application. An application needs to be listening on a port in order to communicate. A protocol is just the language that the two applications on either end of a conversation agree to speak in. If your application is sending streams of bytes to my application, my application needs to know how to interpret

What is the definition of a "glitch" in the context of Functional Reactive Programming? I know that in some FRP frameworks "glitches" can occur while in others not. For example RX is not glitch free while ReactFX is glitch free [ 1 ]. Could someone give a very simple example demonstrating how and when glitches can occur when using RX and show on the same example how and why the corresponding ReactFX solution is glitch free. Thanks for reading. Definition My (own) favorite definition: A glitch is a temporary inconsistency in the observable state. Definition from Scala.Rx : In the context of FRP

When people mention that Spring is a lightweight containter compared to other frameworks, do they mean? That it occupies less memory in the system or it does not have the operations like start stop that we have for EJB containers and it doesn't use a special container? What makes Spring a lightweight container? Whether it is "lightweight" or "heavyweight", it is all about comparison. We consider Spring to be lightweight when we are comparing to normal J2EE container. It is lightweight in the sense of extra memory footprint for the facilities provided (e.g. Transaction Control, Life Cycle,