Alternatively, if you want to do this within Jersey and have access to all
the request metadata available to a Jersey ContainerRequestFilter, you can
inject Jersey's CloseableService and register a callback that will be
invoked after the body completes. The callback will be invoked whether or
not the request succeeds.
Here's a mockup:
import org.glassfish.jersey.server.CloseableService;
import javax.inject.Inject;
import javax.inject.Singleton;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerRequestFilter;
import javax.ws.rs.core.Context;
import java.io.Closeable;
@Singleton
public class TrackingFilter implements ContainerRequestFilter {
private final CloseableService closer;
@Inject
public TrackingFilter(@Context CloseableService closer) {
this.closer = closer;
}
@Override
public void filter(ContainerRequestContext requestContext) {
closer.add(startTracking(requestContext));
}
private Closeable startTracking(ContainerRequestContext requestContext) {
String requestPath = requestContext.getUriInfo().getPath();
long start = System.nanoTime();
return () -> {
long stop = System.nanoTime();
System.out.println("elapsed=" + (stop - start) + " nanos,
request path=" + requestPath);
};
}
}
On Fri, Dec 18, 2020 at 1:45 AM Jochen Schalanda <[email protected]>
wrote:
> Hi Zack,
>
> you could write a Handler for Jetty, similar to the one used in
> Dropwizard/Dropwizard Metrics [1] to get the metrics you want.
>
> [1]:
> https://github.com/dropwizard/metrics/blob/v4.1.16/metrics-jetty9/src/main/java/com/codahale/metrics/jetty9/InstrumentedHandler.java
>
> Best regards,
> Jochen
>
> Am 17.12.2020 um 01:16 schrieb Zack Sampson <[email protected]>:
>
> Hey all,
>
> I've wondered how to do this for years and have never quite managed to
> figure it out. For the purpose of metrics, I'd like to wrap a request such
> that I get the chance to, say, increment a counter while it runs, and then
> decrement it after it completes. Unlike a ContainerResponseFilter, I don't
> want to decrement until the *body* completes, if there is one.
>
> Is there a better way to do this than by frankensteining together an
> interceptor and request filters?
>
> Thank you!
> Zack
>
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