25th March, 2021
Welcome to Mule ESB Tutorials. The objective of these tutorials is to provide a depth understand of Mule ESB.
Mule, the runtime engine of Anypoint Platform, is a lightweight Java-based enterprise service bus (ESB) and integration platform that allows developers to connect applications together quickly and easily, enabling them to exchange data. It enables easy integration of existing systems, regardless of the different technologies that the applications use, including JMS, Web Services, JDBC, HTTP, and more. The ESB can be deployed anywhere, can integrate and orchestrate events in real-time or in batch, and has universal connectivity.
The key advantage of an ESB is that it allows different applications to communicate with each other by acting as a transit system for carrying data between applications within your enterprise or across the Internet. Mule has powerful capabilities that include:
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Many Mule elements can be specified at the global level, that is, as direct children of the outermost mule element. These global elements always have names, which allows them to be referenced where they’re used. Note that a Mule configuration uses a single, flat namespace for global elements. No two global elements can share the same name, even if they are entirely different sorts of things, say an endpoint and a filter.
Following is an example of a simple Mule configuration file:
<mule xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:vm="http://www.mulesoft.org/schema/mule/vm" xsi:schemaLocation=" http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/3.0/mule.xsd http://www.mulesoft.org/schema/mule/vm http://www.mulesoft.org/schema/mule/vm/3.0/mule-vm.xsd"> <vm:connector name="vmConnector" queueTimeout="5000"/> <vm:endpoint name="CustomerRequests" path="customer.requests"/> <vm:endpoint name="CustomerResponses" path="customer.responses"/> <custom-transformer name="ThisToThat" class="com.acme.transformer.ThisToThat"/> <flow name="myBasicFlow"> <inbound-endpoint ref="CustomerRequests"/> <component class="com.acme.service.BasicService"/> <outbound-endpoint ref="CustomerResponses" transformer-refs="ThisToThat"/> </flow> </mule>
Security Manager - Authenticates requests based on one or more security providers
Agents - Agents are typically used for cross-cutting concerns such as logging or management
Notifications - allow you to be notified upon certain lifecycle events
Transaction Management - Mule transactions are configured on inbound endpoints, where an endpoint can be configured to start a new transaction or join an existing one.
Properties - Property placeholders, message properties, and system properties.
Mule components can be any type you want. You can easily integrate anything from a "plain old Java object" (POJO) to a component from another framework.
Mule and the ESB model enable significant component reuse. Unlike other frameworks, Mule allows you to use your existing components without any changes. Components do not require any Mule-specific code to run in Mule, and there is no programmatic API required. The business logic is kept completely separate from the messaging logic.
Messages can be in any format from SOAP to binary image files. Mule does not force any design constraints on the architect, such as XML messaging or WSDL service contracts.
You can deploy Mule in a variety of topologies, not just ESB. Because it is lightweight and embeddable, Mule can dramatically decrease time to market and increases productivity for projects to provide secure, scalable applications that are adaptive to change and can scale up or down as needed.
Mule's staged event-driven architecture (SEDA) makes it highly scalable. A major airline processes over 10,000 business transactions per second with Mule while H&R Block uses 13,000 Mule servers to support their highly distributed environment.
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