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| |
| <document> |
| <properties> |
| <title>Apache Synapse - Sample 154</title> |
| </properties> |
| <body> |
| <section name="Sample 154: Load Balancing with Proxy Services"> |
| <div class="xmlConf"><definitions xmlns="http://ws.apache.org/ns/synapse"> |
| |
| <proxy name="LBProxy" transports="http" startOnLoad="true"> |
| <target faultSequence="errorHandler"> |
| <inSequence> |
| <send> |
| <endpoint> |
| <session type="simpleClientSession"/> |
| <loadbalance algorithm="org.apache.synapse.endpoints.algorithms.RoundRobin"> |
| <endpoint> |
| <address uri="http://localhost:9001/services/LBService1"> |
| <enableAddressing/> |
| <suspendDurationOnFailure>20</suspendDurationOnFailure> |
| </address> |
| </endpoint> |
| <endpoint> |
| <address uri="http://localhost:9002/services/LBService1"> |
| <enableAddressing/> |
| <suspendDurationOnFailure>20</suspendDurationOnFailure> |
| </address> |
| </endpoint> |
| <endpoint> |
| <address uri="http://localhost:9003/services/LBService1"> |
| <enableAddressing/> |
| <suspendDurationOnFailure>20</suspendDurationOnFailure> |
| </address> |
| </endpoint> |
| </loadbalance> |
| </endpoint> |
| </send> |
| <drop/> |
| </inSequence> |
| <outSequence> |
| <send/> |
| </outSequence> |
| </target> |
| <publishWSDL uri="file:repository/conf/sample/resources/proxy/sample_proxy_2.wsdl"/> |
| </proxy> |
| |
| <sequence name="errorHandler"> |
| <makefault response="true"> |
| <code xmlns:tns="http://www.w3.org/2003/05/soap-envelope" value="tns:Receiver"/> |
| <reason value="COULDN'T SEND THE MESSAGE TO THE SERVER."/> |
| </makefault> |
| <send/> |
| </sequence> |
| |
| </definitions></div> |
| <subsection name="Objective"> |
| <p> |
| Demonstrate how to use a proxy service as a load balancer |
| </p> |
| </subsection> |
| <subsection name="Pre-requisites"> |
| <p> |
| <ul> |
| <li> |
| Deploy the LoadbalanceFailoverService in the sample Axis2 server (go to |
| samples/axis2Server/src/LoadbalanceFailoverService and run 'ant') |
| </li> |
| <li> |
| Start 3 instances of the Axis2 server on different ports as follows |
| <div class="command">./axis2server.sh -http 9001 -https 9005 -name MyServer1<br/> |
| ./axis2server.sh -http 9002 -https 9006 -name MyServer2<br/> |
| ./axis2server.sh -http 9003 -https 9007 -name MyServer3</div> |
| </li> |
| <li> |
| Start Synapse using the configuration numbered 154 (repository/conf/sample/synapse_sample_154.xml) |
| <div class="command"> |
| Unix/Linux: sh synapse.sh -sample 154<br/> |
| Windows: synapse.bat -sample 154 |
| </div> |
| </li> |
| </ul> |
| </p> |
| </subsection> |
| <subsection name="Executing the Client"> |
| <p> |
| This sample is similar to <a href="sample54.html">sample 54</a>. The only |
| notable difference is the use of a proxy service. |
| </p> |
| <p> |
| Execute the client as follows. |
| </p> |
| <div class="command">ant loadbalancefailover -Dmode=session -Dtrpurl=http://localhost:8280/services/LBProxy</div> |
| <p> |
| You will get an output similar to the following. |
| </p> |
| <div class="consoleOutput">[java] Request: 1 Session number: 1 Response from server: MyServer3 |
| [java] Request: 2 Session number: 2 Response from server: MyServer2 |
| [java] Request: 3 Session number: 0 Response from server: MyServer1 |
| [java] Request: 4 Session number: 2 Response from server: MyServer2 |
| [java] Request: 5 Session number: 1 Response from server: MyServer3 |
| [java] Request: 6 Session number: 2 Response from server: MyServer2 |
| [java] Request: 7 Session number: 2 Response from server: MyServer2 |
| [java] Request: 8 Session number: 1 Response from server: MyServer3 |
| [java] Request: 9 Session number: 0 Response from server: MyServer1 |
| [java] Request: 10 Session number: 0 Response from server: MyServer1 |
| ... </div> |
| <p> |
| You can see that session ID 0 is always directed to the server named MyServer1. |
| That means session ID 0 is bound to MyServer1. Similarly session 1 and 2 are bound |
| to MyServer3 and MyServer2 respectively. |
| </p> |
| </subsection> |
| </section> |
| <p><a href="../samples.html">Back to Catalog</a></p> |
| </body> |
| </document> |
