| <?xml version="1.0" encoding="ISO-8859-1" ?> |
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| |
| <document> |
| <properties> |
| <title>Apache Synapse - Sample 360</title> |
| </properties> |
| <body> |
| <section name="Sample 360: Introduction to DBLookup Mediator"> |
| <div class="xmlConf"><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> |
| <driver>org.apache.derby.jdbc.ClientDriver</driver> |
| <url>jdbc:derby://localhost:1527/synapsedb;create=false</url> |
| <user>synapse</user> |
| <password>synapse</password> |
| </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> |
| <send/> |
| </out> |
| |
| </sequence> |
| |
| </definitions></div> |
| <subsection name="Objective"> |
| <p> |
| Demonstrating how to perform database lookups during mediation using the dblookup |
| mediator |
| </p> |
| </subsection> |
| <subsection name="Pre-requisites"> |
| <p> |
| <ul> |
| <li> |
| Setup a Derby database 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 360 (repository/conf/sample/synapse_sample_360.xml) |
| <div class="command"> |
| Unix/Linux: sh synapse.sh -sample 360<br/> |
| Windows: synapse.bat -sample 360 |
| </div> |
| </li> |
| </ul> |
| </p> |
| </subsection> |
| <subsection name="Executing the Client"> |
| <p> |
| This sample demonstrates simple database read operations through Synapse. When a |
| message arrives at dblookup mediator, it opens a connection to the database and |
| executes the given SQL query. The SQL query uses '?' character for attributes that |
| will be filled at runtime. The parameters define how to calculate the value of |
| those attributes at runtime. In this sample a dblookup mediator has been used to |
| extract 'id' of the company from the company database using the symbol which is |
| extracted from the SOAP envelope by evaluating an XPath. Then 'id' bases switching |
| will be done by a switch mediator. |
| </p> |
| <p> |
| To try this out, first request a stock quote for the symbol 'IBM' as follows. |
| </p> |
| <div class="command">ant stockquote -Daddurl=http://localhost:9000/services/SimpleStockQuoteService -Dtrpurl=http://localhost:8280/ -Dsymbol=IBM</div> |
| <p> |
| Synapse console will display the following message. |
| </p> |
| <div class="consoleOutput">INFO LogMediator text = ** Looking up from the Database ** |
| INFO LogMediator text = Company ID – c1</div> |
| <p> |
| Now request a quote for the symbol 'SUN'. |
| </p> |
| <div class="command">ant stockquote -Daddurl=http://localhost:9000/services/SimpleStockQuoteService -Dtrpurl=http://localhost:8280/ -Dsymbol=SUN</div> |
| <p> |
| Synapse will display the following output. |
| </p> |
| <div class="consoleOutput">INFO LogMediator text = ** Looking up from the Database ** |
| INFO LogMediator text = Company ID – c2</div> |
| <p> |
| Finally send a stock quote request for the symbol 'MSFT'. |
| </p> |
| <div class="command">ant stockquote -Daddurl=http://localhost:9000/services/SimpleStockQuoteService -Dtrpurl=http://localhost:8280/ -Dsymbol=MSFT</div> |
| <p> |
| In this case Synapse will display the following output. |
| </p> |
| <div class="consoleOutput">INFO LogMediator text = ** Looking up from the Database ** |
| INFO LogMediator text = Company ID – c2</div> |
| <p> |
| If you send any requests with different symbols, dblookup mediator will return |
| an empty result set, since those symbols are not stored in the Derby database. |
| So as a result Synapse will not be able to determine the company ID, which will |
| result in the following log entry (from the default case in the switch mediator). |
| </p> |
| <div class="consoleOutput">INFO LogMediator text = ** Unrecognized Company ID **</div> |
| </subsection> |
| </section> |
| <p><a href="../samples.html">Back to Catalog</a></p> |
| </body> |
| </document> |
