If you are only concerned with http requests, an alternative would be to
implement a servlet Filter[1].
Here is a very basic outline of what it could look like:
public class PerformanceFilter implements javax.servlet.Filter {
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) {
final long start = System.currentTimeMillis();
try {
chain.doFilter(request, response);
} finally {
final long elapsed = System.currentTimeMillis() - start;
if (elapsed > threshold) {
logger.error((HttpServletRequest)request.getRequestURI() + " from " +
request.getRemoteAddr() + " took " + elapsed + "ms");
}
}
}
}
[1] - http://docs.oracle.com/javaee/5/api/javax/servlet/Filter.html
Brett Okken | CAMM Platform Services | Lead Architect | 816.201.6112 |
www.cerner.com | [email protected]
-----Original Message-----
From: Dave Cherkassky [mailto:[email protected]]
Sent: Tuesday, April 30, 2013 9:08 AM
To: [email protected]
Subject: Accessing an HttpServletRequest from inside an AXIS2 module
I am implementing AXIS2 services in my web application. Our client's
production boxes are a bit flaky, so I want a heads up when performance
degraded. Specifically:
- request comes into my AXIS2 service
- measure the time that the request takes
- if the time is greater than X, log an error
So I wrote an AXIS2 module like this:
public class PerformanceHandler extends AbstractHandler implements Handler
{
protected Logger logger = null;
public PerformanceHandler() {
logger = LoggerFactory.getLogger( this.getClass() );
}
public InvocationResponse invoke( MessageContext msgContext ) throws
AxisFault {
HttpServletRequest r = ( HttpServletRequest
)msgContext.getProperty( HTTPConstants.MC_HTTP_SERVLETREQUEST );
if( msgContext.getFLOW() == MessageContext.IN_FLOW ||
msgContext.getFLOW() == MessageContext.IN_FAULT_FLOW ) {
// incoming request
Date timeIn = new Date( System.currentTimeMillis() );
r.setAttribute( this.getClass().getName() + ".timeIn",
timeIn );
if( logger.isDebugEnabled() ) {
logger.debug( "Request " + r.toString() + "
started processing at "
+ timeIn );
}
} else {
// outgoing response
Date timeIn = ( Date )r.getAttribute(
this.getClass().getName() + ".timeIn" );
Date timeOut = new Date( System.currentTimeMillis() );
if( logger.isDebugEnabled() ) {
logger.debug( "Request " + r.toString() + "
finished processing at " + timeOut );
}
long delta = timeOut.getTime() - timeIn.getTime();
if( delta > 300 ) { // todo: parameterize the delta
threshold
logger.error( "Request " + r.toString() + "
took " + delta + "ms to process." );
}
}
return InvocationResponse.CONTINUE;
}
}
After that, I edited the module.xml, axis2.xml appropriately, created the *.mar
file and ran the app.
However, it seems that
HttpServletRequest r = ( HttpServletRequest
)msgContext.getProperty( HTTPConstants.MC_HTTP_SERVLETREQUEST )
is null. That was unexpected.
So my questions are:
- How can I access the servlet request in an AXIS2 module?
- If this is not allowed, what's the alternative for me to track the
time between request starting processing and ending processing?
- I should be using some other existing AXIS2 functionality that can
give me the same kind of result?
Many thanks in advance,
--
Dave Cherkassky
DJiNN Software Inc
VP of Software Development
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