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Fixtures to assist in testing via FitNesse
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package nl.hsac.fitnesse.fixture.util;

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import org.apache.http.entity.ContentType;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * Receiver for a callback from application being tested.
 */
public class HttpServer  {
    private static final ContentType XML_UTF8_TYPE = ContentType.parse(XmlHttpResponse.CONTENT_TYPE_XML_TEXT_UTF8);

    private final T response;
    private final com.sun.net.httpserver.HttpServer server;
    private final AtomicInteger requestsReceived = new AtomicInteger(0);
    private final Object lock = new Object();

    /**
     * Creates new.
     * @param aPath context the server will serve (must start with '/').
     * @param aResponse response to send when request is received, request will
     *                  be added to it when this server receives one.
     */
    public HttpServer(String aPath, T aResponse) {
        response = aResponse;
        try {
            server = com.sun.net.httpserver.HttpServer.create();
            bind(server);
            server.createContext(aPath, getHandler(aResponse));
            server.start();
        } catch (IOException ex) {
            throw new RuntimeException(ex);
        }
    }

    /**
     * @return address the server listens on.
     */
    public InetSocketAddress getAddress() {
        return server.getAddress();
    }

    /**
     * @return response, with request filled (with last received request) if getRequestsReceived() is larger than 0.
     */
    public T getResponse() {
        return response;
    }

    /**
     * @return number of requests this server received.
     */
    public int getRequestsReceived() {
        return requestsReceived.get();
    }

    /**
     * @param maxWait ms to wait at most.
     * @return response with last request filled, if at least one was received.
     */
    public T waitForRequest(long maxWait) {
        long start = System.currentTimeMillis();
        try {
            while (requestsReceived.get() < 1
                    && (System.currentTimeMillis() - start) < maxWait) {
                try {
                    Thread.sleep(50);
                } catch (InterruptedException ex) {
                    throw new RuntimeException(ex);
                }
            }
        } finally {
            stopServer();
        }

        return getResponse();
    }

    /**
     * Stops server from listening.
     */
    public void stopServer() {
        synchronized (lock) {
            server.stop(0);
        }
    }

    /**
     * Finds free port number and binds the server to it.
     */
    protected void bind(com.sun.net.httpserver.HttpServer server) {
        try {
            int port = 0;
            InetAddress address = InetAddress.getLocalHost();
            for (int possiblePort = 8000; port == 0; possiblePort++) {
                try {
                    InetSocketAddress s = new InetSocketAddress(address, possiblePort);
                    server.bind(s, 1);
                    port = possiblePort;
                } catch (IOException e) {
                    // try next number
                    continue;
                }
            }
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    protected HttpHandler getHandler(final T aResponse) {
        HttpHandler result = new HttpHandler() {
            @Override
            public void handle(HttpExchange he) throws IOException {
            // ensure we never handle multiple requests at the same time
            synchronized (lock) {
                OutputStream os = null;
                try {
                    String request;
                    if ("POST".equals(he.getRequestMethod()) || "PUT".equals(he.getRequestMethod())) {
                        InputStream is = he.getRequestBody();
                        request = FileUtil.streamToString(is, String.format("http %s request", he.getRequestMethod()));
                    } else {
                        request = String.format("%s: %s", he.getRequestMethod(), he.getRequestURI().toString());
                    }
                    aResponse.setRequest(request);

                    ContentType contentType = XML_UTF8_TYPE;
                    byte[] responseBytes = aResponse.getResponse()
                                            .getBytes(contentType.getCharset());
                    he.sendResponseHeaders(aResponse.getStatusCode(),
                                            responseBytes.length);
                    he.getResponseHeaders()
                            .add("Content-Type", contentType.toString());
                    os = he.getResponseBody();
                    os.write(responseBytes);
                    os.flush();
                } finally {
                    incrementRequestsReceived();
                    if (os != null) {
                        os.close();
                    }
                }
            }
            }
        };
        return result;
    }

    protected int incrementRequestsReceived() {
        return requestsReceived.incrementAndGet();
    }
}