| <?xml version="1.0" encoding="ISO-8859-1" ?> |
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| |
| <document> |
| <properties> |
| <title>Apache Synapse - Sample 363</title> |
| </properties> |
| <body> |
| <section name="Sample 363: Reusable Database Connection Pools"> |
| <div class="xmlConf"><![CDATA[<definitions xmlns="http://ws.apache.org/ns/synapse"> |
| |
| <sequence name="myFaultHandler"> |
| <makefault response="true"> |
| <code xmlns:tns="http://www.w3.org/2003/05/soap-envelope" value="tns:Receiver"/> |
| <reason expression="get-property('ERROR_MESSAGE')"/> |
| </makefault> |
| <send/> |
| <drop/> |
| </sequence> |
| |
| <sequence name="main" onError="myFaultHandler"> |
| <in> |
| <log level="custom"> |
| <property name="text" value="** Looking up from the Database **"/> |
| </log> |
| <dblookup> |
| <connection> |
| <pool> |
| <dsName>lookupdb</dsName> |
| </pool> |
| </connection> |
| <statement> |
| <sql>select * from company where name =?</sql> |
| <parameter xmlns:m0="http://services.samples" |
| expression="//m0:getQuote/m0:request/m0:symbol" type="VARCHAR"/> |
| <result name="company_id" column="id"/> |
| </statement> |
| </dblookup> |
| |
| <switch source="get-property('company_id')"> |
| <case regex="c1"> |
| <log level="custom"> |
| <property name="text" |
| expression="fn:concat('Company ID - ',get-property('company_id'))"/> |
| </log> |
| <send> |
| <endpoint> |
| <address uri="http://localhost:9000/services/SimpleStockQuoteService"/> |
| </endpoint> |
| </send> |
| </case> |
| <case regex="c2"> |
| <log level="custom"> |
| <property name="text" |
| expression="fn:concat('Company ID - ',get-property('company_id'))"/> |
| </log> |
| <send> |
| <endpoint> |
| <address uri="http://localhost:9000/services/SimpleStockQuoteService"/> |
| </endpoint> |
| </send> |
| </case> |
| <case regex="c3"> |
| <log level="custom"> |
| <property name="text" |
| expression="fn:concat('Company ID - ',get-property('company_id'))"/> |
| </log> |
| <send> |
| <endpoint> |
| <address uri="http://localhost:9000/services/SimpleStockQuoteService"/> |
| </endpoint> |
| </send> |
| </case> |
| <default> |
| <log level="custom"> |
| <property name="text" value="** Unrecognized Company ID **"/> |
| </log> |
| <makefault response="true"> |
| <code xmlns:tns="http://www.w3.org/2003/05/soap-envelope" |
| value="tns:Receiver"/> |
| <reason value="** Unrecognized Company ID **"/> |
| </makefault> |
| <send/> |
| <drop/> |
| </default> |
| </switch> |
| <drop/> |
| </in> |
| |
| <out> |
| <log level="custom"> |
| <property name="text" value="** Reporting to the Database **"/> |
| </log> |
| <dbreport> |
| <connection> |
| <pool> |
| <dsName>reportdb</dsName> |
| </pool> |
| </connection> |
| <statement> |
| <sql>update company set price=? where name =?</sql> |
| <parameter xmlns:m0="http://services.samples" |
| expression="//m0:return/m0:last/child::text()" type="DOUBLE"/> |
| <parameter xmlns:m0="http://services.samples" |
| expression="//m0:return/m0:symbol/child::text()" type="VARCHAR"/> |
| </statement> |
| </dbreport> |
| <log level="custom"> |
| <property name="text" value="** Looking up from the Database **"/> |
| </log> |
| <dblookup> |
| <connection> |
| <pool> |
| <dsName>reportdb</dsName> |
| </pool> |
| </connection> |
| <statement> |
| <sql>select * from company where name =?</sql> |
| <parameter xmlns:m0="http://services.samples" |
| expression="//m0:return/m0:symbol/child::text()" type="VARCHAR"/> |
| <result name="stock_price" column="price"/> |
| </statement> |
| </dblookup> |
| <log level="custom"> |
| <property name="text" |
| expression="fn:concat('Stock price - ',get-property('stock_price'))"/> |
| </log> |
| <send/> |
| |
| </out> |
| |
| </sequence> |
| |
| </definitions>]]></div> |
| <subsection name="Objective"> |
| <p> |
| Demonstrate how to setup reusable connection pools for the dblookup and dbreport |
| mediators |
| </p> |
| </subsection> |
| <subsection name="Pre-requisites"> |
| <p> |
| <ul> |
| <li> |
| Setup a Derby database and the Synapse data sources as described in the |
| <a href="setup/db.html">database setup guide</a> |
| </li> |
| <li> |
| Deploy the SimpleStockQuoteService in the sample Axis2 server and start Axis2 |
| </li> |
| <li> |
| Start Synapse using the configuration numbered 363 (repository/conf/sample/synapse_sample_363.xml) |
| <div class="command"> |
| Unix/Linux: sh synapse.sh -sample 363<br/> |
| Windows: synapse.bat -sample 363 |
| </div> |
| </li> |
| </ul> |
| </p> |
| </subsection> |
| <subsection name="Executing the Client"> |
| <p> |
| This sample employs two instances of the dblookup mediator and a single instance |
| of the dbreport mediator. The two dblookup mediators are sharing the same database |
| connection pool named 'lookupdb'. The dbreport mediator makes use of a different |
| connection pool named 'dbreport'. Synapse uses Apache DBCP to create and manage |
| the corresponding data sources and connection pools. |
| </p> |
| <p> |
| Run this sample by invoking the client as follows. |
| </p> |
| <div class="command">ant stockquote -Daddurl=http://localhost:9000/services/SimpleStockQuoteService -Dtrpurl=http://localhost:8280/ -Dsymbol=IBM</div> |
| <p> |
| Synapse will log the following output as it reads from and writes to the database. |
| </p> |
| <div class="consoleOutput">INFO LogMediator text = ** Looking up from the Database ** ... |
| INFO LogMediator text = Company ID - c1 ... |
| INFO LogMediator text = ** Reporting to the Database ** ... |
| INFO LogMediator text = ** Looking up from the Database ** ... |
| INFO LogMediator text = Stock price - 183.3635460215262</div> |
| </subsection> |
| </section> |
| <p><a href="../samples.html">Back to Catalog</a></p> |
| </body> |
| </document> |
