How to use For Each Component

1. For Each Component
15-12-2015

2. Abstract
• The main motto of this PPT is how to use For
Each component in our applications.

3. Introduction
• The Foreach scope splits a collection into
elements and processes them iteratively
through the processors embedded in the
scope, then returns the original message to
the flow.

4. Example

5. • .mflow<?xml version="1.0" encoding="UTF-8"?>
• <mule xmlns:jdbc-ee="http://www.mulesoft.org/schema/mule/ee/jdbc" xmlns:http="http://www.mulesoft.org/schema/mule/http"
xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans" version="EE-3.4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-
instance" xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-current.xsd
• http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
• http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
• http://www.mulesoft.org/schema/mule/ee/jdbc http://www.mulesoft.org/schema/mule/ee/jdbc/current/mule-jdbc-ee.xsd">
• <jdbc-ee:mssql-data-source name="MS_SQL_Data_Source" user=“****" password=“****"
url="jdbc:sqlserver://localhost;databaseName=test1" transactionIsolation="UNSPECIFIED" doc:name="MS SQL Data Source"/>
• <jdbc-ee:connector name="Database" dataSource-ref="MS_SQL_Data_Source" validateConnections="true" queryTimeout="-1"
pollingFrequency="0" doc:name="Database"/>
• <flow name="Database_ComponentFlow1" doc:name="Database_ComponentFlow1">
• <http:inbound-endpoint exchange-pattern="request-response" host="localhost" port="8087" path="database" doc:name="HTTP"/>
• <logger message="--main flow--" level="INFO" doc:name="Logger"/>
• <jdbc-ee:outbound-endpoint exchange-pattern="request-response" queryKey="select" queryTimeout="-1" connector-
ref="Database" doc:name="Database">
• <jdbc-ee:query key="select" value="select * from mytable"/>
• </jdbc-ee:outbound-endpoint>
• <foreach collection="#[payload]" doc:name="For Each">
• <logger message="--In foreach loop" level="INFO" doc:name="Logger"/>
• <logger message="--Result--#[payload]" level="INFO" doc:name="Logger"/>
• </foreach>
• </flow>
• </mule>

6. • Output:INFO 2015-10-03 17:50:45,299 [main] org.mule.DefaultMuleContext:
• **********************************************************************
• * Application: Database Component *
• * OS encoding: Cp1252, Mule encoding: UTF-8 *
• * *
• * Agents Running: *
• * Clustering Agent *
• * JMX Agent *
• **********************************************************************
• INFO 2015-10-03 17:50:45,300 [main] org.mule.module.launcher.MuleDeploymentService:
• ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
• + Started app 'Database Component' +
• ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
• INFO 2015-10-03 17:50:52,770 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-main flow--
• INFO 2015-10-03 17:50:52,778 [[Database Component].connector.http.mule.default.receiver.02] org.mule.lifecycle.AbstractLifecycleManager:
Initialising: 'Database.dispatcher.424429501'. Object is: EEJdbcMessageDispatcher
• INFO 2015-10-03 17:50:52,779 [[Database Component].connector.http.mule.default.receiver.02] org.mule.lifecycle.AbstractLifecycleManager:
Starting: 'Database.dispatcher.424429501'. Object is: EEJdbcMessageDispatcher
• INFO 2015-10-03 17:50:53,042 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-In foreach loop
• INFO 2015-10-03 17:50:53,046 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-Result--{subj=Hindi, marks=55, name=Ramesh, id=1}
• INFO 2015-10-03 17:50:53,047 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-In foreach loop
• INFO 2015-10-03 17:50:53,049 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-Result--{subj=English, marks=65, name=Mahesh, id=2}
• INFO 2015-10-03 17:50:53,050 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-In foreach loop
• INFO 2015-10-03 17:50:53,052 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-Result--{subj=science, marks=75, name=Pavan, id=3}
• INFO 2015-10-03 17:50:53,053 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-In foreach loop
• INFO 2015-10-03 17:50:53,056 [[Database Component].connector.http.mule.default.receiver.02] org.mule.api.processor.LoggerMessageProcessor: -
-Result--{subj=social, marks=45, name=Siva, id=4}

7. • Flow of execution:
1. URL to trigger the service from browser
http://localhost:8087/foreach
2. Database component connects to the specific
database, executes the select query and prints
the result (one by one) using for each
component

8. References
• https://docs.mulesoft.com/mule-user-
guide/v/3.7/foreach