Retrieve the Properties inside ESB 4.9.0 Synapse Engine for API Invoke using Class Mediator

[Article moved from ajanthane.blogspot.com]

To retrieve the list of properties available inside the Synapse Engine, follow the below:

Create a class mediator as below:

package com.custom.urlmapping;

import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.MessageContext;
import org.apache.synapse.mediators.AbstractMediator;

public class RetrieveURLMappingMediator extends AbstractMediator {

 private static final Log log = LogFactory
   .getLog(RetrieveURLMappingMediator.class);

 public boolean mediate(MessageContext context) {

  log.info("RetrieveURLMappingMediator Invoked.");

  Set propertySet = context.getPropertyKeySet();
  for (Object propertyKey : propertySet) {

   log.info("Key: " + propertyKey.toString() + "| value: "
     + context.getProperty(propertyKey.toString()));
  }

  return true;
 }
}

Create a API as below:

<api xmlns="http://ws.apache.org/ns/synapse" name="RetriveURLMapping" context="/retrieve">
   <resource methods="GET" uri-template="/view/{symbol}">
      <inSequence>
         <log level="custom">
            <property name="STATUS" value="------------------RetriveURLMapping Invoked--------------------"></property>
         </log>
         <class name="com.custom.urlmapping.RetrieveURLMappingMediator"></class>
         <log level="custom">
            <property name="STATUS" value="------------------RetriveURLMapping Invoked END--------------------"></property>
         </log>
      </inSequence>
   </resource>
</api>

Output log will be:

[2017-03-08 15:16:14,713]  INFO - LogMediator STATUS = ------------------RetriveURLMapping Invoked--------------------
[2017-03-08 15:16:14,714]  INFO - RetrieveURLMappingMediator RetrieveURLMappingMediator Invoked.
[2017-03-08 15:16:14,714]  INFO - RetrieveURLMappingMediator Key: REST_API_CONTEXT| value: /retrieve
[2017-03-08 15:16:14,714]  INFO - RetrieveURLMappingMediator Key: REST_URL_PREFIX| value: http://172.17.0.1:8280
[2017-03-08 15:16:14,714]  INFO - RetrieveURLMappingMediator Key: SYNAPSE_REST_API_VERSION| value: 
[2017-03-08 15:16:14,714]  INFO - RetrieveURLMappingMediator Key: REST_METHOD| value: GET
[2017-03-08 15:16:14,714]  INFO - RetrieveURLMappingMediator Key: REST_SUB_REQUEST_PATH| value: /view/12345
[2017-03-08 15:16:14,714]  INFO - RetrieveURLMappingMediator Key: REST_FULL_REQUEST_PATH| value: /retrieve/view/12345
[2017-03-08 15:16:14,714]  INFO - RetrieveURLMappingMediator Key: uri.var.symbol| value: 12345
[2017-03-08 15:16:14,714]  INFO - RetrieveURLMappingMediator Key: TRANSPORT_IN_NAME| value: http
[2017-03-08 15:16:14,714]  INFO - RetrieveURLMappingMediator Key: SYNAPSE_RESOURCE| value: e056039cf63ab475f60c7bcc490e27bd50789e56c10dc453
[2017-03-08 15:16:14,715]  INFO - RetrieveURLMappingMediator Key: SYNAPSE_REST_API| value: RetriveURLMapping
[2017-03-08 15:16:14,715]  INFO - LogMediator STATUS = ------------------RetriveURLMapping Invoked END--------------------