## Apache Synapse

## Sample 705: Introduction to Message Forwarding Processor With Advance Parameters

<!-- Introduction to Message Forwarding Processor With max deliver attempt and drop the message after max deliver attempt--> <definitions xmlns="http://ws.apache.org/ns/synapse"> <endpoint name="StockQuoteServiceEp"> <address uri="http://localhost:9000/services/SimpleStockQuoteService"> <suspendOnFailure> <errorCodes>-1</errorCodes> <progressionFactor>1.0</progressionFactor> </suspendOnFailure> </address> </endpoint> <sequence name="fault"> <log level="full"> <property name="MESSAGE" value="Executing default 'fault' sequence"/> <property name="ERROR_CODE" expression="get-property('ERROR_CODE')"/> <property name="ERROR_MESSAGE" expression="get-property('ERROR_MESSAGE')"/> </log> <drop/> </sequence> <sequence name="main"> <in> <log level="full"/> <property name="FORCE_SC_ACCEPTED" value="true" scope="axis2"/> <property name="OUT_ONLY" value="true"/> <property name="target.endpoint" value="StockQuoteServiceEp"/> <store messageStore="MyStore"/> </in> <description>The main sequence for the message mediation</description> </sequence> <messageStore name="MyStore"/> <messageProcessor class="org.apache.synapse.message.processors.forward.ScheduledMessageForwardingProcessor" name="ScheduledProcessor" messageStore="MyStore"> <parameter name="interval">10000</parameter> <parameter name="max.deliver.attempts">3</parameter> <parameter name="max.deliver.drop">true</parameter> </messageProcessor> </definitions>

### Objective

Introduction to Synapse Scheduled Message Forwarding Processor with advance parameters (max deliver attempt and drop the message after max deliver attempt)

### Pre-requisites

- Start Synapse using the configuration numbered 705 (repository/conf/sample/synapse_sample_705.xml)
  Unix/Linux: sh synapse.sh -sample 705
  Windows: synapse.bat -sample 705

### Executing the Client

Execute the sample client a few times with the following command.

ant stockquote -Daddurl=http://localhost:9000/services/SimpleStockQuoteService -Dtrpurl=http://localhost:8280/ -Dmode=placeorder

When you start to send request to synapse from client, you will see message forwarding processor without getting deactivate it keep on processing. This is due to the message will be dropped from the message store after the maximum number of delivery attempts are made, and the message processor will remain activated. "max.deliver.drop" parameter would have no effect when no value is specified for the Maximum Delivery Attempts parameter. If this parameter is disabled, the undeliverable message will not be dropped and the message processor will be deactivated.

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