Mule ESB is a lightweight Java-based enterprise service bus (ESB) and integration platform that allows developers to connect applications together quickly and easily. It acts as a transit system for carrying data between applications within an enterprise or across the Internet. Mule ESB includes powerful capabilities such as supporting over 30 protocols, simplified POJO-based programming, multiple access points, and extensive out of the box data transformations. Key components of Mule include flows, message processors like transformers and routers, and messages which contain a header and payload.

1. Mule ESB

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Why we use Enterprise Service Bus?
ESB as Single Point of Access
ESB asTransaction 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 ServiceWrapper), 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 IBMWeb 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 andVariables
 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