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Stochastice Performance Logic is a formalism for capturing performance assumptions. It is, for example, possible to capture assumption that newer version of a function bar is faster than the previous version or that library foobar is faster than library barfoo when rendering antialiased text. The purpose of this framework is to allow evaluation of SPL formulas inside Java applications.

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package cz.cuni.mff.d3s.spl.visualization;

import org.apache.commons.io.IOUtils;

import javax.ws.rs.core.Response;
import javax.ws.rs.*;
import java.io.IOException;
import java.io.InputStream;


@Path("/")
public class WebVisualizer {

	@GET
	@Path("/{file : [a-zA-Z_0-9.-]*}")
	public Response explicitFiles(@PathParam("file") String requestedFile) {
		return serveFile(requestedFile);
	}

	@GET
	@Path("/{dir : [a-zA-Z_0-9]*}/{file : [a-zA-Z_0-9.-]*}")
	public Response explicitFiles(@PathParam("dir") String dir, @PathParam("file") String requestedFile) {
		return serveFile(dir + "/" + requestedFile);
	}

	@GET
	@Path("/{dir1 : [a-zA-Z_0-9]*}/{dir2 : [a-zA-Z_0-9]*}/{file : [a-zA-Z_0-9.-]*}")
	public Response explicitFiles(@PathParam("dir1") String dir1, @PathParam("dir2") String dir2, @PathParam("file") String requestedFile) {
		return serveFile(dir1 + "/" + dir2 + "/" + requestedFile);
	}

	@GET
	public Response defaultFile() {
		return serveFile("index.html");
	}

	private Response serveFile(String fileName) {
		try {
			InputStream content = getClass().getResourceAsStream("/cz/cuni/mff/d3s/spl/visualization/" + fileName);
			if (fileName.endsWith(".css")) {
				return Response.ok().type("text/css").entity(content).build();
			} else {
				return Response.ok().entity(content).build();
			}
		} catch (NullPointerException e) {
			return Response.status(404).entity("Not Found").build();
		}
	}
}