## Apache Synapse

## Sample 852: Introduction to Synapse Splitter-Agrregator eip function template

<definitions xmlns="http://ws.apache.org/ns/synapse"> <import xmlns="http://ws.apache.org/ns/synapse" name="EipLibrary" package="synapse.lang.eip" /> <sequence name="main"> <call-template target="synapse.lang.eip.splitter_aggregator"> <with-param name="attach_path_enabled" value="true"/> <with-param name="endpoint_uri" value="http://localhost:9000/services/SimpleStockQuoteService"/> <with-param xmlns:m0="http://services.samples" name="iterate_exp" value="{{//m0:getQuote/m0:request}}"/> <with-param xmlns:m0="http://services.samples" name="attach_path" value="{{//m0:getQuote}}"/> <with-param name="sequence_ref" value="enr"/> <with-param xmlns:m0="http://services.samples" name="aggregator_exp" value="{{//m0:return}}"/> <with-param name="oncomplete_seq_enabled" value="true"/> </call-template> </sequence> <sequence xmlns="http://ws.apache.org/ns/synapse" name="enr"> <log level="custom"> <property name="text" value="seqhit"/> </log> <enrich> <source xmlns:m0="http://services.samples" clone="true" xpath="//m0:return[not(preceding-sibling::m0:return/m0:last &lt;= m0:last) and not(following-sibling::m0:return/m0:last &lt; m0:last)]"/> <target type="body"/> </enrich> <send/> </sequence> </definitions>

### Objective

This sample is an introduction to Synapse Splitter-Aggregator combined function template.

### Pre-requisites

- Deploy the SimpleStockQuoteService in the sample Axis2 server and start Axis2
- Start Synapse using the configuration numbered 852 (repository/conf/sample/synapse_sample_852.xml)
  Unix/Linux: sh synapse.sh -sample 852
  Windows: synapse.bat -sample 852

### Executing the Client

In this sample, the message sent to Synapse will be splitted according to the given Xpath expression and does a synchronized call for the given endpoint and aggregates replies. Then mediates to the defined target sequence which filter the response which contains the best quote and send back to the client. Here it only uses Splitter-Aggregator template.

Invoke the client as follows.

ant stockquote -Dtrpurl=http://localhost:8280/ -Ditr=4

The above command will send a request containing four fragments in it.

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