How to get value of 'CARBON_HOME' in java code - wso2

Question

I was trying to implement an Axis2 service that receives user requests and publishes them as events to a CEP using carbon databridge thrift (via 'org.wso2.carbon.databridge.agent.thrift.DataPublisher')
I followed the code sample provided in wso2cep-3.1.0/samples/producers/activity-monitor
please see the following code snippet
public class GatewayServiceSkeleton{
private static Logger logger = Logger.getLogger(GatewayServiceSkeleton.class);
public RequestResponse request(Request request)throws AgentException,
MalformedStreamDefinitionException,StreamDefinitionException,
DifferentStreamDefinitionAlreadyDefinedException,
MalformedURLException,AuthenticationException,DataBridgeException,
NoStreamDefinitionExistException,TransportException, SocketException,
org.wso2.carbon.databridge.commons.exception.AuthenticationException
{
final String GATEWAY_SERVICE_STREAM = "gateway.cep";
final String VERSION = "1.0.0";
final String PROTOCOL = "tcp://";
final String CEPHOST = "cep.gubnoi.com";
final String CEPPORT = "7611";
final String CEPUSERNAME = "admin";
final String CEPPASSWORD = "admin";
Object[] metadata = { request.getDeviceID(), request.getViewID()};
Object[] correlationdata = { request.getSessionID()};
Object[] payloaddata = {request.getBucket()};
KeyStoreUtil.setTrustStoreParams();
KeyStoreUtil.setKeyStoreParams();
DataPublisher dataPublisher = new DataPublisher(PROTOCOL + CEPHOST + ":" + CEPPORT, CEPUSERNAME, CEPPASSWORD);
//create event
Event event = new Event (GATEWAY_SERVICE_STREAM + ":" + VERSION, System.currentTimeMillis(), metadata, correlationdata, payloaddata);
//Publish event for a valid stream
dataPublisher.publish(event);
//stop
dataPublisher.stop();
RequestResponse response = new RequestResponse();
response.setSessionID(request.getSessionID());
response.setDeviceID(request.getDeviceID());
response.setViewID(request.getViewID());
response.setBucket(request.getBucket());
return response;
}
there is also a utility class that set the key store parameters as following
public class KeyStoreUtil {
static File filePath = new File("../../../repository/resources/security");
public static void setTrustStoreParams() {
String trustStore = filePath.getAbsolutePath();
System.setProperty("javax.net.ssl.trustStore", trustStore + "/client-truststore.jks");
System.setProperty("javax.net.ssl.trustStorePassword", "wso2carbon");
}
public static void setKeyStoreParams() {
String keyStore = filePath.getAbsolutePath();
System.setProperty("Security.KeyStore.Location", keyStore + "/wso2carbon.jks");
System.setProperty("Security.KeyStore.Password", "wso2carbon");
}
}
I uploaded the service into a wso2as-5.2.1, and called the service using SOAPUI
the request returned an error message "cannot borrow client for TCP"
I debug, and found out the problem might lies with the class 'KeyStoreUtil',
where the 'filePath' somehow retuned a 'null',
static File filePath = new File("../../../repository/resources/security");
and caused the failure on this line
DataPublisher dataPublisher = new DataPublisher(PROTOCOL + CEPHOST + ":" + CEPPORT, CEPUSERNAME, CEPPASSWORD);
I guess it could be a better idea if I use the value of "CARBON_HOME" to figure out the location of Key Store
so my question is :
How may I be able to get the value of 'CARBON_HOME' in the Java code?
that said. If you think a bit more:
the service will be called numerous time; whileas the 'setTrustStoreParams' and the 'setKeyStoreParams' will only be needed to executed once at the server/service initiate.
So, are there any even better ways to remove 'setTrustStoreParams' and 'setKeyStoreParams' out of the service code, or implement as configurable items?
Please advise
thanks

Answer 1

so my question is :
How may I be able to get the value of 'CARBON_HOME' in the Java code?
You should use the property carbon.home like following which will retrieve the WSO2 product's home directory.
System.getProperty("carbon.home");