ESB INTERVIEW QUESTIONS AND ANSWERS PDF

There are lot of opportunities from many reputed companies in the world. According to research MuleSoft has a market share of about 5. Overview What is ESB? An enterprise service bus ESB is software architecture for middleware that provides fundamental services for more complex architectures. In a general sense, an ESB can be thought of as a mechanism that manages access to applications and services especially legacy versions to present a single, simple, and consistent interface to end-users via Web- or forms-based client-side front ends. Mule is a lightweight event-driven enterprise service bus ESB and an integration platform.

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There are lot of opportunities from many reputed companies in the world. According to research MuleSoft has a market share of about 5. Overview What is ESB? An enterprise service bus ESB is software architecture for middleware that provides fundamental services for more complex architectures.

In a general sense, an ESB can be thought of as a mechanism that manages access to applications and services especially legacy versions to present a single, simple, and consistent interface to end-users via Web- or forms-based client-side front ends.

Mule is a lightweight event-driven enterprise service bus ESB and an integration platform. It is a lightweight and modular solution that could scale from an application-level messaging framework to an enterprise-wide highly distributable object broker. Transport: applications can accept input from a variety of means, from the file system to the network. Data format: speaking the right protocol is only part of the solution, as applications can use almost any form of representation for the data they exchange.

Invocation styles: synchronous, asynchronous, or batch call semantics entail very different integration strategies. Lifecycles: applications of different origins that serve varied purposes tend to have disparate development, maintenance, and operational lifecycles.

Why Mule Was Designed? These modules would provide support for a wide range of transports or add extra features, such as distributed transactions, security, or management. Mule was also designed as a programmatic framework offering programmers the means to graft additional behavior such as specific message processing or custom data transformation.

Prescriptive deployment model, whereas Mule supports a wide variety of deployment strategies. Mainly focused on higher-level concerns, whereas Mule deals extensively with all the details of integration.

Comprehensive documentation, a subject on which MuleSource has made huge progress recently. The first logical layer is the model layer. A Mule model represents the runtime environment that hosts services. It defines the behavior of Mule when processing requests handled by services. The model provides services with supporting features, such as exception strategies. It also provides services with default values that simplify their configuration.

A Mule service is composed of all the Mule entities involved in processing particular requests in predefined manners. A service is defined by a specific configuration.

This configuration determines the different elements, from the different layers of responsibility, that will be mobilized to process the requests that it will be open to receive.

Depending on the type of input channel it uses, a service may or may not be publicly accessible outside of the ESB. The transport layer is in charge of receiving or sending messages.

This is why it is involved with both inbound and outbound communications. A transport manifests itself in the configuration by the following elements: connectors, endpoints and transformers. A transport also defines one message adapter. A message adapter is responsible for extracting all the information available in a particular request data, meta information, attachments, and so on and storing them in transport-agnostic fashion in a Mule message.

What Is Connector In Mule? A connector is in charge of controlling the usage of a particular protocol. It is configured with parameters that are specific to this protocol and holds any state that can be shared with the underlying entities in charge of the actual communications. For example: a JMS connector is configured with a Connection, which is shared by the different entities in charge of the actual communication.

What Is Endpoint In Mule? Hence it controls what underlying entities will be used with the connector they depend on.

The target destination itself is defined as a URI. What Is Transformer In Mule? A transformer takes care of translating the content of a message from one form to another. It is possible to chain transformers to cumulate their effects. Transformers can kick in at different stages while a message transits through a service. What Is Router In Mule? Routers play a crucial role in controlling the trajectory a message will follow when it transits in Mule. They are the gatekeepers of the endpoints of a service, taking care of keeping messages on the right succession of tracks so they can reach their intended destinations.

Certain routers act like the big classification yards: they can split, sort, or regroup messages based on certain conditions. What Is Filter In Mule? Filters are a powerful complement to the routers. Filters provide the brains routers need to make smart decisions about what to do with messages in transit.

Some filters go as far as deeply analyzing the content of a message for a particular value on which their outcome will be based. What Is Component In Mule?

Each service is organized with a component at its core and inbound and outbound routers around it. Components are used to implement a specific behavior in a service. This behavior can be as simple as logging messages or can go as far as invoking other services.

Components can also have no behavior at all; in that case they are pass-through and make the service act as a bridge between its inbound and outbound routers. Optionally, multiple named attachments, to support the notion of multipart messages. Mule uses configuration builders that can translate a human-authored configuration file into the complex graph of objects that constitutes a running node of this ESB.

The main builders are of two kinds: a Spring-driven builder, which works with XML files, and a script builder, which can accept scripting language files.

A bridge component is used to pass the messages from the inbound router to the outbound one. A bridge is a neutral component: it does not perform any action or modify messages that it processes. There are different following approaches that can be used when modularizing a configuration. Independent configurations — a Mule instance can load several independent configuration files side by side.

Inherited configurations — main idea is to express a formal parent-child dependency between two configurations. By strongly expressing this dependency, you will have the guarantee at boot time that no configuration file has been omitted. The following illustrates how instance. If Mule figures out that one of our endpoints needs a particular connector, it will automatically instantiate one for us, using all the default values for its different configuration parameters.

This is a perfectly viable approach if we are satisfied with the behavior of the connector when it uses its default configuration. This hidden configuration is automatically used for each instance of the connector. It defines technical parameters such as what classes to use for the message receivers, requesters, and dispatchers; or the default transformers to use in inbound, outbound, and response routers. Knowing these default values is essential to grasping the behavior of a transport.

You will use inbound and outbound endpoints to communicate between components and services inside Mule as well as with the outside world. Outbound endpoints are used to send data. An outbound endpoint is used to do things such as send SOAP messages, write to file streams, and send email messages. An endpoint destination that is shared by several routers, it is worth creating a global endpoint.

A global endpoint is not typified for inbound or outbound routing, making it usable in many different places in a configuration file. It must be named so it can actually be used in a service, which will reference the global endpoint by its name. A global endpoint can also help clarify the usage of a particular destination. This allows us to configure a generic endpoint using the Mule 1. The value of this streaming property can be either true or false.

If it is set to true then we are actually working on stream of file data otherwise we are working with file itself. When we want file inbound endpoints to poll their source directories for new content.

This is accomplished by setting the pollingFrequency to some milliseconds value. The default value of autoDelete is true. Therefore, a file inbound endpoint will, by default, remove the file from the source directory once it is read by the inbound endpoint.

If you do not want to delete file automatically then you can set autoDelete property to false. The fileAge property specifies how long the endpoint should wait before reading the file again. For instance, a fileAge of indicates Mule should wait a minute before processing the file again. Use the below element in file inbound to filter certain types of files. These messages never leave the JVM the Mule instance is running in. The multicasting router can send messages to multiple endpoints over different transports.

The multicasting router allows you to easily move the same messages across these different endpoints. What Is Mule Transformer? It is an event, more specifically an instance of org.

This object carries not only the actual content of the message but also the context of the event. What Is Mule Context? The Mule context is composed of references to different objects, including security credentials, if any, the session in which the request is processed. The content of a message, also known as payload. It is wrapped in an instance of org. MuleMessage, which provides different means of accessing the payload under different forms.

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In this post we will look at ESB Interview questions. Examples are provided with explanations. Q: What is an ESB? It can be defined as a tool designed to help implement an application using SOA principles.

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