SlowRequestFilter, um filtro para requests lentos baseado em: https://github.com/dropwizard/dropwizard/blob/master/dropwizard-servlets/src/main/java/io/dropwizard/servlets/SlowRequestFilter.java

SlowRequestFilter.java

import javax.servlet.*;
import javax.servlet.annotation.*;
import javax.servlet.http.*;
import java.io.IOException;

import static java.util.concurrent.TimeUnit.NANOSECONDS;

@WebFilter (value="/*",
    initParams=({
       @WebInitParam(name="duration", value="1")
    }))
public class SlowRequestFilter implements Filter {
    private final threshold;

    @Override
    public void init(FilterConfig config) throws ServletException {
        super(config);
        this.threshold = Long.parseLong(config.getInitParameter("duration"));
    }

    @Override
    public void destroy() {}

    @Override
    public void doFilter(ServletRequest request,
                         ServletResponse response,
                         FilterChain chain) throws IOException, ServletException {
        final HttpServletRequest httpRequest = (HttpServletRequest) request;
        final long startTime = System.nanoTime();
        try {
            chain.doFilter(request, response);
        } finally {
            final long elapsedMS = NANOSECONDS.toMillis(System.nanoTime() - startTime);
            if (elapsedNS >= threshold) {
                System.out.printf("Slow request: %s %s (%d ms)", httpRequest.getMethod(), getFullUrl(httpRequest), elapsedMS);
            }
        }
    }
    
    public static String getFullUrl(HttpServletRequest request) {
        final StringBuilder url = new StringBuilder(100).append(request.getRequestURI());
        if (request.getQueryString() != null) {
            url.append('?').append(request.getQueryString());
        }
        return url.toString();
    }
}