wso2 Rest response from custom code - rest

Question

I have the following usecase, where I have to create a rest url dynamically using the properties. For that I have created a custom Mediator which reads the properties and creates calls the backend service.
I am having an issue on how to send the response back to the user. It is an xml format. But I need to parse the xml and just send the text. For that I am using PayloadFactory. I am attaching my code here, can someone please suggest what I am doing wrong?
<api xmlns="http://ws.apache.org/ns/synapse" name="tririgaProxy" context="/services">
<resource methods="GET" url-mapping="/employee">
<inSequence>
<sequence key="tririgaConf"/>
<property name="triUser" expression="get-property('triUser')"/>
<property name="triPass" expression="get-property('triPass')"/>
<property name="triURL" expression="get-property('triURL')"/>
<property name="triWfName" expression="get-property('triPeople.database.employee.wfName')"/>
<class name="com.wso2.tririga.mediator.IncomingMediator"/>
<payloadFactory media-type="text">
<format><![CDATA[$1]</format>
<args>
<arg evaluator="xml" expression="/status/text()"/>
</args>
</payloadFactory>
</inSequence>
</resource>
Java Class:
package com.wso2.tririga.mediator;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.apache.synapse.MessageContext;
import org.apache.synapse.mediators.AbstractMediator;
import org.apache.synapse.util.PayloadHelper;
public class IncomingMediator extends AbstractMediator {
private static final Log log = LogFactory.getLog(IncomingMediator.class);
#Override
public boolean mediate(MessageContext msgContext) {
String triUser = String.valueOf(msgContext.getProperty("triUser"));
String triPass = String.valueOf(msgContext.getProperty("triPass"));
String triURL = String.valueOf(msgContext.getProperty("triURL"));
String triWfName = String.valueOf(msgContext.getProperty("triWfName"));
try {
URI uri = new URIBuilder(triURL)
.addParameter("USERNAME", triUser)
.addParameter("PASSWORD", triPass)
.addParameter("ioName", triWfName).build();
log.info("URI: "+uri.toString());
String response = execute(uri);
PayloadHelper.setTextPayload(msgContext, convertToXML(response));
} catch (URISyntaxException e) {
log.error("Error while creating URI", e);
}
return true;
}
private static String execute(URI uri) {
String responseBody = null;
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
HttpGet get = new HttpGet();
((HttpRequestBase) get).setURI(uri);
ResponseHandler<String> responseHandler = new ResponseHandler<String>() {
#Override
public String handleResponse(final HttpResponse response) throws ClientProtocolException, IOException {
int status = response.getStatusLine().getStatusCode();
if (status >= 200 && status < 300) {
HttpEntity entity = response.getEntity();
String responseStr = EntityUtils.toString(entity);
return "Successful".equalsIgnoreCase(responseStr) ? "RetCode=C;Message=Success" : "RetCode=F;Message=Failed because Itegration Exception";
} else {
throw new ClientProtocolException("Unexpected response status: " + status);
}
}
};
try {
responseBody = httpclient.execute(get, responseHandler);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} finally {
try {
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return responseBody;
}
private static String convertToXML(String response){
return"<status>"+response+"</status>";
}
}
I dont get any response back from here.

Answer 1

Since you need to transform the response message you need to do the payload transformation in the out sequence of the api.
currently what you are doing is transforming the message in the in sequence.