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| |
| <document> |
| <properties> |
| <title>Apache Synapse - Sample 300</title> |
| </properties> |
| <body> |
| <section name="Sample 300: Introduction to Synapse Tasks"> |
| <div class="xmlConf"><definitions xmlns="http://ws.apache.org/ns/synapse"> |
| |
| <task class="org.apache.synapse.startup.tasks.MessageInjector" name="CheckPrice"> |
| <property name="to" value="http://localhost:9000/services/SimpleStockQuoteService"/> |
| <property name="soapAction" value="urn:getQuote"/> |
| <property name="message"> |
| <m0:getQuote xmlns:m0="http://services.samples"> |
| <m0:request> |
| <m0:symbol>IBM</m0:symbol> |
| </m0:request> |
| </m0:getQuote> |
| </property> |
| <trigger interval="5"/> |
| </task> |
| |
| <sequence name="main"> |
| <in> |
| <send/> |
| </in> |
| <out> |
| <log level="custom"> |
| <property xmlns:ax21="http://services.samples/xsd" |
| xmlns:ns="http://services.samples" name="Stock_Quote_on" |
| expression="//ns:return/ax21:lastTradeTimestamp/child::text()"/> |
| <property xmlns:ax21="http://services.samples/xsd" |
| xmlns:ns="http://services.samples" name="For_the_organization" |
| expression="//ns:return/ax21:name/child::text()"/> |
| <property xmlns:ax21="http://services.samples/xsd" |
| xmlns:ns="http://services.samples" name="Last_Value" |
| expression="//ns:return/ax21:last/child::text()"/> |
| </log> |
| </out> |
| </sequence> |
| |
| </definitions></div> |
| <subsection name="Objective"> |
| <p> |
| Demonstrate how to schedule tasks in the Synapse runtime for periodic execution |
| </p> |
| </subsection> |
| <subsection name="Pre-requisites"> |
| <p> |
| <ul> |
| <li> |
| Deploy the SimpleStockQuoteService in the sample Axis2 server and start Axis2 |
| </li> |
| <li> |
| Start Synapse using the configuration numbered 300 (repository/conf/sample/synapse_sample_300.xml) |
| <div class="command"> |
| Unix/Linux: sh synapse.sh -sample 300<br/> |
| Windows: synapse.bat -sample 300 |
| </div> |
| </li> |
| </ul> |
| </p> |
| </subsection> |
| <subsection name="Executing the Client"> |
| <p> |
| The above configuration adds a scheduled task to the Synapse runtime. The task |
| is configured to run every 5 seconds (note the 'interval' attribute on the 'trigger' |
| element). |
| </p> |
| <p> |
| One can write his/her own tasks implementing the org.apache.synapse.task.Task |
| interface and programming the 'execute' method to run the necessary logic. For |
| this particular sample we have used the MessageInjector class which just injects |
| a message into Synapse environment. In the configuration we have set the message |
| payload to be the stock quote request payload. |
| </p> |
| <p> |
| In this sample, injected messages will be sent to the sample Axis2 server which |
| will send back a response to Synapse. So every 5 seconds you will notice that Axis2 |
| is generating a quote and Synapse is receiving the stock quote response. |
| </p> |
| </subsection> |
| </section> |
| <p><a href="../samples.html">Back to Catalog</a></p> |
| </body> |
| </document> |
