Mule esb

MULE
REQUIRED S/W
MULE BUILDING BLOCKS
SET UP IDE/SW
DEMO EXAMPLES
AGENDA

› What is Mule ESB?
Enterprise Service Bus (ESB)
Easily perform integration of existing systems, Regardless of
technology.
Service creation and hosting — expose and host reusable services.
Service mediation- service mediator aids communication between
system-level service consumers and service providers
Message routing - route, filter, aggregate, and re-sequence messages
based on content and rules.
 Data transformation — exchange data across varying formats and
transport protocols
MULE ESB RECAP

› Components: are flexible tools which perform business logic
implemented in Java and other scripting languages for e.g java
component, javascript, groovy, echo, logger.
› Filters: only allow certain messages to continue to be processed in a
flow for e.g .
› Routers: control message flow to route, resequence, or split and
aggregate messages in a flow for e.g All flow, Choice flow.
› Scopes wrap other messages processors so as to enable them to
perform together as a group. for e.g Async, Message Enricher, foreach.
› Transformers convert message payload type and data format to
facilitate communication between systems converters. Object to
String,Body to Parameter Map.
Message Processors

› To make decisions about routing, filtering, and other common tasks.
The logic of these decisions often relies on evaluating expressions.
› Mule Expression Language (MEL) is the primary language used for
formulating such expressions throughout Mule ESB.
SIGNIFICANCE MEL

› The message header, which contains metadata about the message
› The message payload, which contains your business-specific data.
MULE MESSAGE

#[message.header.get()] This expression calls the "get" method
and performs it on the object,
#[message.payload[4]] the expression returns the value of the
5th item in the list.
#[message.payload['type'].equals('XM
L')]
Check if param type is equals to XML
#[message.id] This expression accesses a particular
attribute associated with the specified
context object.
#[message.payload] Returns payload.
#[2 + 2 == 4] This expression uses an operator to
perform a comparison. It evaluates to
true.
MULE EXPRESSION
LANGUAGE

› EndPoints
› Ajax: this allows mule events to be asynchronously
received to and from web.
› File: Allows mule application to read and write into local file
system.
› Http: Allow mule events to be connected with http protocol.
› Jms: Allow mule events to read and send message to
queue with JMS API.
Components

› Commonly Used Component
› Use a Logger component to log activities in the flow as they occur.
› Use an Expression component to evaluate a particular expression upon a
message in a flow.
› Use an Echo component to return the payload of a message as a call
response.
› Use a Flow Ref component to access another flow from within a flow.
Component cont.

› Mule message filters are message processors that follow the enterprise
integration pattern called Message Filter.
Message Filters

› A filter that discards incoming HTTP requests
› ………
<flow name="filteredFlow2">
<http:inbound-endpoint host="localhost" port="8000" path="orders"/>
<expression-filter
expression="message.inboundProperties['Authorization'] != null"/>
<component class="org.my.OrderProcessingComponent" />
</flow>…..
Message filters cont.

› A choice router is a message processor that decides where
to send a message based on their contents.
› A choice exception strategy is a way of deciding which way
to route a message that must deviate from the normal
processing path. Choice exception strategies use MEL
expressions.
Choice routers

› <flow name="downloadsSorterFlow">
› <file:inbound-endpoint path="/home/me/downloads" />
› <choice>
› <when expression="#[message.inboundProperties['filename'].endsWith('.jpg']">
› <file:outbound-endpoint path="/home/me/photos" />
› </when>
› <when expression="#[message.inboundProperties['filename'].endsWith('.doc')]">
› <file:outbound-endpoint path="#[/home/me/docs" />
› </when>
› <otherwise>
› <file:outbound-endpoint path="/home/me/misc"/>
› </otherwise>
› </choice>
› </flow>
XML CONFIGURATION

› Mule invokes a Messaging Exception Strategy whenever an exception
is thrown within a flow.
Exception STRATEGY

› An expression transformer is a message processor that executes
expressions on the current message. The results of the expressions
replace the payload.
› This transformer transforms the message by appending “Received !” to
the message payload.
› <expression-transformer expression="#[message.payload +
'Received!']"/>
Expression
transformers

› A logger is a message processor that logs message via Mules logging
sub-system.
› The message to be logged is configured as an attribute of the logger.
This message attribute supports tokens (placeholders). The tokens can
contain MEL expressions.
<logger
message="File Received (size =
#[message.inboundProperties['fileSize']/1024] kb)"
level="INFO"
/>
Loggers

› Extract the downloaded MuleStudio binary into a folder
› Go to bin folder Run MuleStudio.exe
› To create new project file->mule project
SETUP IDE

• CONTENT BASED ROUTING
• JMS EXAMPLE
• STRATEGIC EXCEPTION
DEMO

• Import a project into a mule studio choice example.
• Right click on the project –start as mule project
• Watch the logs whether project is deployed successfully.
• Execute following url to get XML response
• http://localhost:1001/?name=Muley&amount=20000&term=48&ssn=12
34&type=XML
• Execute following url to get different response
• http://localhost:1001/?name=Muley&amount=20000&term=48&ssn=12
34&type=othervalue
How to run

› Start Apache mq
› Import jmsexample into mule studio, deploy the project.
› Open http://localhost:8161/admin/queues.jsp . click on send tab,
Message gui will appear, select queue as queue1 and set body content
either 1001 or 1002 or 1003 for valid content or other value to set error
messages .
› Watch console logs, payload for each flow will appear.
› Success message will enqueue in customerqueue
› Error message will enqueue in errorqueue
Steps to run

› Start Apache mq
› Import catchexception strategy into mule studio, deploy the
project by running project as mule application.
› Open http://localhost:8161/admin/queues.jsp . click on
send tab, Message gui will appear, select queue as queue1
and set body content either ERROR OR TEST OR
othervalue
› Watch console logs, payload for each flow will appear.
Steps to run

› MEL
http://www.mulesoft.org/documentation/display/current/Introduction+to+
Expressions+in+Mule
› Cheat Sheat
ttp://www.mulesoft.org/documentation/display/current/MEL+Cheat+Sheet
› Transformers
http://www.mulesoft.org/documentation/display/current/Transformers
ESB References

Mule esb

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