How to use poll scope

1. How to use Poll scope
17-05-2015

2. Abstract
• The main motto of this PPT is How to use Poll
scope in our applications.

3. Introduction
• While some connectors, such
as HTTP and FTP, utilize a polling process to
actively retrieve messages from an external
resource, most message processors in Mule
are triggered when called by a previous
element in a flow. If you want to arrange for a
message processor to actively call a resource
at regular intervals, use a Poll scope.

4. Example

5. .mflow
• <?xml version="1.0" encoding="UTF-8"?>
• <mule 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">
• <flow name="PollFlow1" doc:name="PollFlow1">
• <poll frequency="10000" doc:name="Poll">
• <logger level="INFO" doc:name="Logger" message="Hi"/>
• </poll>
• <logger message="Friend" level="INFO" doc:name="Logger"/>
• </flow>
• </mule>

6. • Output:
• + Started app 'Poll' +
• ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
• INFO 2016-05-17 17:38:24,996 [[Poll].connector.polling.mule.default.receiver.01]
org.mule.api.processor.LoggerMessageProcessor: Hi
• INFO 2016-05-17 17:38:25,019 [[Poll].PollFlow1.stage1.02]
org.mule.api.processor.LoggerMessageProcessor: Friend
• INFO 2016-05-17 17:38:34,486 [[Poll].connector.polling.mule.default.receiver.01]
org.mule.api.processor.LoggerMessageProcessor: Hi
• INFO 2016-05-17 17:38:34,488 [[Poll].PollFlow1.stage1.02]
org.mule.api.processor.LoggerMessageProcessor: Friend
• INFO 2016-05-17 17:38:44,486 [[Poll].connector.polling.mule.default.receiver.01]
org.mule.api.processor.LoggerMessageProcessor: Hi
• INFO 2016-05-17 17:38:44,490 [[Poll].PollFlow1.stage1.02]
org.mule.api.processor.LoggerMessageProcessor: Friend
• INFO 2016-05-17 17:38:54,486 [[Poll].connector.polling.mule.default.receiver.01]
org.mule.api.processor.LoggerMessageProcessor: Hi
• INFO 2016-05-17 17:38:54,488 [[Poll].PollFlow1.stage1.02]
org.mule.api.processor.LoggerMessageProcessor: Friend
• INFO 2016-05-17 17:39:04,487 [[Poll].connector.polling.mule.default.receiver.01]
org.mule.api.processor.LoggerMessageProcessor: Hi
• INFO 2016-05-17 17:39:04,491 [[Poll].PollFlow1.stage1.02]
org.mule.api.processor.LoggerMessageProcessor: Friend

7. • Flow of execution:
1. It automatically triggers for every 10sec and
displays content of 2 loggers in console

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