In this age of business expansion and advancement in technology, many big organizations are always looking for methods to increase their business. One main factor governing the expansion of any business is communication. If managers and other office staff are not able to communicate among different clients, then there will be no plausible way for their business to increase its revenue. ActiveMQ is a boon in terms of open source communication software that only allows rapid and effective communication between the client and the broker, but also provides multitudes of efficient features that will always attract more clients.
In order to take their companies to higher notches, companies are adopting ActiveMQ as their source for communication. If you are looking for a job as a programmer or coder then ActiveMQ is one language that will come handy. Recruiters ask a combination of tricky and easy ActiveMQ interview questions that can sometimes leave your mind – boggling. Read below some of the most frequent and important ActiveMQ interview questions to not only get an idea about the programming language and get you your dream job!
ActiveMQ is an open source message broker that is basically written using Java programming language. It is mainly written using the Java Message Service (JMS). The benefit of such an open source – messaging broker is that it provides some executive features to enterprises, which implies that a particular communication can be promoted from one client to another.
|S.No||Synchronous messages||Asynchronous messages|
|1||Synchronous messages are the type of messages during which a client has to wait for the server to send a response to a particular message that is generated.||On the other hand, asynchronous messages are the types of messages where the client receives a quick response from the server.|
|2||These type of messages are generally generated from the server end.||These type of messages are generally generated when a trigger message is automatically sent to the server.|
|3||Examples of synchronous messages include telephone calls, radio communications, etc.||Examples of asynchronous messages include emails, blogs, SMS, etc.|
The following code can help a user change a default username or password:
# Defines users that can access the web (console, demo, etc.) # username: password [,rolename ...] admin: admin, admin user: user, user
# Defines users that can access the web (console, demo, etc.) # username: password [,rolename ...] NewUserName: NewPassword, admin user: user, user
ActiveMQ is a messaging service that has extensive features to support both the broker and the client. While on the other hand, Mule is an ESB that has the capabilities to provide executive features to only the broker by exchanging messages among different software components.
The architecture of Mule is such that it is designed to deliver achievable programming setup for integration of applications between the database and an operating system. However, mule does not support any kind of system for native messaging, thus it is generally used alongside with ActiveMQ. In order to incorporate Mule with ActiveMQ, the user is required to introduce different and unique frameworks to define various boundaries for connectivity.
The core objectives required by a JMS – enabled application include the following:
Fuse Message Broker is an affirmed dispersion of Apache ActiveMQ given by FuseSource. FuseSource does the majority of its improvement and settles bugs as a component of the Apache ActiveMQ community, so there are no practical contrasts between the two. FuseSource may accomplish more successive discharges than Apache may, so it is conceivable to get bug fixes from a Fuse Message Broker discharge sooner than from an official Apache ActiveMQ discharge.
AMQP is an acronym for Advanced Message Queue Protocol. It is a description as to how clients can send messages and how brokers can interpret and exchange the information. It follows a wire-level protocol between brokers and clients for effective and efficient communication. It is not entirely a messaging system alike ActiveMQ, however, it is only a messaging protocol.
JMS is an acronym for Java Message Service. It is an application program interface (API) primarily produced by Sun Microsystems. These applications support a variety of formal communications also known as messaging, especially between different computers within a network. The main function provided by JMS is that it acts as a common interface for standard messaging protocols and in addition, acts as a special messaging facility in order to support various Java programs.
The customer using the application such as the JavaBeans firstly parts and segments the web in order to be able to send or receive JMS message synchronously. In addition to that, the customer using the application can also likewise get message non – concurrently. With the assistance of message-driven beans, JMS supplier can alternatively execute the preparation of messages. The message-driven beans are a kind of big business bean that empowers the offbeat utilization of various kinds of messages. The task of sending and accepting message is completed and is in conveyed, which then permits JMS tasks and database to get inside a solitary exchange.
The MOM (Message Oriented Middleware) is a service that fills in as a transition between two conveying segments. MOM is kept in between the customer and server so that it gives the office of passing message by utilizing the procedure lining. Until the customer does not demand to peruse the message, the messages will be kept away in line. By utilizing this procedure, the product segment can work freely of time.
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