Codahale metrics with Play framework

MetricsPlugin.java

package plugins;

import play.PlayPlugin;
import play.mvc.Http;
import play.mvc.Http.Request;
import play.mvc.Http.Response;
import play.mvc.Router.Route;
import play.vfs.VirtualFile;
import util.MetricsUtil;

public class MetricsPlugin extends PlayPlugin
{
	@Override
	public boolean serveStatic(VirtualFile file, Request request, Response response)
	{
		String type = request.path.substring(request.path.lastIndexOf('.')+1);
		MetricsUtil.markMeter("static", type);
		return false;
	}

	@Override
	public void onRequestRouting(Route route)
	{
		Http.Request.current().args.put("route.action", route.action);
		Http.Request.current().args.put("route.method", route.method);
		MetricsUtil.markMeter("requests", route.action);
		MetricsUtil.markMeter("type", route.method);
	}
	
	@Override
	public void invocationFinally()
	{
		Http.Request request = Http.Request.current();
		Http.Response response = Http.Response.current();

		if (request == null || response == null)
			return;
		
		String action = (String) request.args.get("route.action");
		String method = (String) request.args.get("route.method");


		long requestProcessingTime = System.currentTimeMillis() - request.date.getTime();
		int time = (int) requestProcessingTime;
		MetricsUtil.updateHistogram("histograms", "requesttime", time);
		
		if (action != null)
			MetricsUtil.updateHistogram("histograms.requesttime", action, time);
		if (method != null)
			MetricsUtil.updateHistogram("histograms.requesttime", method, time);

		if (request.action != null && response.out.size() > 0)
		{
			int size = response.out.size();
			MetricsUtil.updateHistogram("histograms", "responsesize", size);
			if (action != null)
				MetricsUtil.updateHistogram("histograms.responsesize", action, size);
			if (method != null)
				MetricsUtil.updateHistogram("histograms.responsesize", method, size);
		}
	}
}