This document summarizes key elements in Mule ESB, including connectors, components, transformers, scopes, filters, flow controls, and exception handling strategies. It provides examples of how connectors receive and send messages and how transformers can alter message contents. Scopes are described as encapsulating message processors, and filters are said to evaluate messages to determine flow. Flow controls act as splitters and resequencers, while exception strategies capture failures.

1. - S R I K A N T H N
Mule ESB Tutorial Part 2
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2. Mule ESB Elements
 Below are the Mule Elements which is defined in Anypoint Studio.
 1. Connectors
 2. Scopes
 3. Components
 4. Transformers
 5. Filters
 6. Flow Controls
 7. Error Handling
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3. Mule - Connectors
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 Mule Connectors receive or send message between Mule and one or more external
sources such as File, databases or Webservices.
 Mule Connectors will be placed at first component in flow (or) middle as message
processor that performs an operation in flow.
 Connectors in Mule are either endpoint-based or Operation-based.
 Endpoit-based connectors : VM, File, JMS, Jetty..etc
 Operation-based connectors : Salesforce, Twitter, Facebook, Http, Web Service,
Database ..etc.
 Example :
HTTP connector Configuration:
<http:listener config-ref="HTTP_Listener_Configuration" path="/" doc:name="HTTP"/>

4. Mule - Components
 Mule Components are message processors which execute business logic on messages, but
which are mule specific code and we can drop a component.
 We can customize the components if required any additional validation on mule message.
 Mule components :
Scripting : Groovy, JavaScript, Python, Ruby.
WebService Components : REST and CXF
Others : Java, HTTP Static Resource Handler, Flow Reference., Logger..etc.
Example :
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5. Mule – Transformers
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 Mule Transformer altering the contents of the message properties, variables or
payload.
 Example : message source is receives date in XML format but downstream processor
expects a java object in which case we have XML-to-Object transformer to convert it
for you.
 We have enough pre-build transformers provided by MuleSoft, few are provided
below.
1. Java Object : JSON to Objuect and XML to Object.
2. Content : Append String, Prase Template and Expression.
3. SAP : SAP Object to XML and XML to SAP Object
4. Properties : Variable, Session Variable
---etc..
Additional MuleSoft is provided “DataMapper” which is most powerful Transformer whicj
will help developer life so easy

6. Mule – Transformers
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 Mule DataMapper : will take the input payload and mapped or changed with required
elements in out payload.

7. Mule –Scopes
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 Mule Scopes work to encapsulate other message processor so that they function as
single unit.
 Mule is having enough scope to process and fit our requirement, those are below.
Async - execute asynchronously and rest of the process execute in parallel.
Cache - Caches date produced by part of the flow.
ForEach – Spilts any type of collections apart into individual messages for processing,
and then aggregate them again in end of the flow.
Message Enricher – Append the information to a message.
Much more – Transactional, Until Successful, Poll, Composite Source…etc.

8. Mule –Filter
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 Mule Filters evaluates a message to determine whether it can proceed though a flow.
Example : you can use filter of you flow to reject any requests from a particular sources.
1. We can declare custom filter to validate specific requirement of client.
2. We can declare global filter to validate for all flows.
Mule Filters are :

9. Mule – Flow Controls or Routers
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 Mule Flow Controls act as splitters, resequencers and splitting messages into
individual items for processing.
 We do have many Flow controls provided by Mulesoft, moreover we can customazie.
 Mule flow controls are :

10. Mule – Exception Strategies
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 Mule Exception strategy will capture the exception when mule flow got failed to
process mule message.
 Mule Exception Strategies fall into two categories : System Exceptions and Message
Exceptions
 System Exceptions :
* During application start-up
* When a connection to external system fails.
 System Exceptions are not configuration in Mule, which will log the exception.
 Message Exception : Mule invokes a Messaging Exception Strategy whenever an
exception is thrown within a flow. Whenever a message is involved, exceptions are
handled by messaging exception strategies

11. Mule – Exception Strategies
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 Mule provided message strategies are :
 Message Exception Strategy

12. Chapter 2 End
 Any Questions?
(please post srikanthnallapa23@gmail.com)
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