moco stub server

HelloStubServer.java

package com.github.mccxj.stub;

import com.github.dreamhead.moco.internal.ActualHttpServer;
import com.github.dreamhead.moco.internal.MocoHttpServer;

import java.io.File;
import java.io.FilenameFilter;
import java.util.Arrays;

import static com.github.dreamhead.moco.Moco.*;

public class HelloStubServer {
    public static void main(String[] args) throws Exception {
        final String adir = "adir";
        ChangeCallBack callback = new ChangeCallBack() {
            MocoHttpServer httpServer = null;
            
            @Override
            public void callback() {
                if(httpServer != null)
                    httpServer.stop();
                ActualHttpServer server = (ActualHttpServer) httpserver(12306);
                httpServer = new MocoHttpServer(server);
                File[] files = new File(adir).listFiles(new FilenameFilter() {
                    @Override
                    public boolean accept(File dir, String name) {
                        return name.endsWith("txt");
                    }
                });
                for (File f : files) {
                    server.post(and(by(uri("/foo")), eq(xpath("/request/parameters/id/text()"), f.getName().substring(0, f.getName().length() - 4)))).response(file(f.getAbsolutePath()));
                }
                server.response("foo");
                httpServer.start();
            }
        };
        DirWatcher watcher = new DirWatcher(adir, callback);
        watcher.start();
    }
}

interface ChangeCallBack {
    public void callback();
}

class DirWatcher extends Thread {
    private final ChangeCallBack callback;
    private final String dir;
    private String[] prevFiles;

    public DirWatcher(String dir, ChangeCallBack callback) {
        this.dir = dir;
        this.callback = callback;
    }

    @Override
    public void run() {
        while (true) {
            String[] files1 = new File(dir).list();
            Arrays.sort(files1);

            if (prevFiles == null){
                prevFiles = files1;
                callback.callback();
            }

            if (!sameFiles(prevFiles, files1)) {
                prevFiles = files1;
                callback.callback();
            }

            try {
                Thread.sleep(5L);
            } catch (InterruptedException e) {
                e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
            }
        }
    }

    private boolean sameFiles(String[] f1, String[] f2) {
        if (f1.length != f2.length)
            return false;
        for (int i = 0; i < f1.length; i++)
            if (!f1[i].equals(f2[i]))
                return false;
        return true;
    }
}