How to get an Object from Reast Easy Preprocessor to PostProcessor?

Question

I have a scenario where I need to implement a mechanism to show in log the time taken for my rest api to execute. I am planning to have a PreProcessorInterceptor containing something like

long startTime = system.currenttimemillis()

And in PostProcessInterceptor I will get the endTime and planning to subtract the startTime from endTime. How can I get the starttime in my PostProcessInterceptor ?

Answer 1

Using a ContainerRequestFilter and a ContainerResponseFilter you could add an property to the request:

@Provider
@PreMatching
public class TimerRequestFilter implements ContainerRequestFilter {

    @Override
    public void filter(ContainerRequestContext requestContext) throws IOException {
        requestContext.setProperty("startTime", System.currentTimeMillis());        
    }

}

@Provider
public class TimerResponseFilter implements ContainerResponseFilter {

    private static final Logger LOG = LoggerFactory.getLogger(TimerResponseFilter.class);

    @Override
    public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException {
        long startTime = (long) requestContext.getProperty("foo.bar.startTime");
        LOG.info("Execution took {}ms", System.currentTimeMillis() - startTime);
    }

}