Mule ESB is a lightweight Java-based integration platform that allows different applications to communicate with each other by acting as a transit system for carrying data between applications. It supports over 30 protocols and technologies and includes powerful capabilities like acting as a single point of access, transaction manager, and security manager. Mule ESB uses flows to process messages where each message passes through a sequence of message processors like transformers, filters, routers, and components. Key elements of Mule messages include properties, variables, payload, and attachments.

1. Mule Enterprise Service Bus

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Why we use Enterprise Service Bus?
ESB as Single Point of Access
ESB as Transaction Manager
ESB as Security Manager

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Why we use Mule Enterprise Service Bus?
Support for more than 30 protocols and technologies
Simplified POJO-based programming model leveraging existing developer skill-sets
for fast deployment
Support for multiple access points such as JMS, JDBC, and SOAP
No reliance on vendor-specific proprietary protocols
Ease of use – services can be configured easily in one configuration file.
Extensive data transformations out of the box
Small footprint: memory and disk, no application server required
Integration platform model: highly modular, easily extensible codebase - implement
proven patterns and build streamlined solutions to unique challenges
The open source advantage: large community of real-world integration experts and
developers using Mule and contributing to codebase

5. Mule ESB Flow
Mule ESB 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. Mule ESB enables easy
integration of existing systems, regardless of the different technologies that the
applications use, including JMS, Web Services, JDBC, HTTP, and more.
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 ESB
includes powerful capabilities that include:

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Software Requirement for Mule Application
Operating System- Windows XP SP2, Windows 2000, Windows 2003 Server (32-
bit if using the Java Service Wrapper), Linux, Solaris, AIX, HP-UX, and Mac
OSX.
Application Servers- Tomcat, JBoss,WebSphere, WebLogic, and Jetty.
Messaging- Any JMS vendor; users have reported integration via Active MQ,
Open MQ, TIBCO EMS, TIBCO Rendezvous, Oracle AQ, and IBM Web Sphere
MQ
Java- JDK 1.5 and 1.6

7. Mule use to transport to receive and send message from and to all kind of
source including Java Messaging service (JMS), HTTP, FTP,
TCP/IP,SMTP,POP3 and file. Another important concept of mule is the service
definitions which consist some specific layers that can be solve the integration
of multiple protocol and application’s communication problems.
Application
Channel
Message Receiver
Connector
Transformers
Inbound Routers
Component
Outbound Routers
Message Dispatcher
Mule Component Overview

8.  Flow is a Message Source followed by a chain
of message processors
 Each processors is invoked in a sequence
 Processor operate a message

9. What is Message Processor
Message processors are responsible for processing the
received message.
These message processors are categorized by function:
Components: perform business logic & are typically
application specific
Transformers: transform the message
Filters: accept/reject messages
Routers: control the message flow
Endpoints: send/receive messages over a transport

10. What is Sub Flow
 Sub flow is a private flow which is not
visible outside the current flow
 A sub flow will not have a Message Source.

11. Mule Message
The Data received from an endpoint is packaged
into an object that implements Mule Message
interface
A Message contains:
A series of properties that vary
depending on the transport
Variables – Session and Flow
The data as the payload of the Mule Message.
If required, a series of attachments
that can accompany the message.

12. Mule Message Structure
 The Mule message is the data that passes through an application via one or
more flows. It consists of two main parts:
 The message header, which contains metadata about the message
 The message payload, which contains your business-specific data.

13. Mule Message Properties and Variables
 Message header consists of properties which
provide useful information about the message
 variables represent data about a message
 Properties have two main
scopes: inbound and outbound.Inbound Property

14.  Inbound Message properties are immutable
 Automatically generated by the message source and
cannot be set or manipulated by the user.
 They contain metadata specific to the message
source that prevents scrambling of data formats or
other processing mishaps later in the message's
lifecycle.
 A message retains its inbound properties only for
the duration of the flow; when a message passes out
of a flow, its inbound properties do not follow it
Inbound Message properties

15.  They contain metadata similar to that of an inbound
property, but an outbound property is applied after
the message enters the flow
 Outbound properties can be set automatically by
Mule or a user can set them by manually inserting
one or more transformer elements in the flow.
 If the message is passed to a new flow via a flow-
ref rather than a connector, the outbound properties
remain outbound properties rather than being
converted to inbound properties
Outbound Message Properties