/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.test.clustering.cluster.singleton.service;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jboss.as.server.CurrentServiceContainer;
import org.jboss.msc.service.ServiceController;
import org.jboss.msc.service.ServiceName;
import org.wildfly.clustering.group.Node;
@WebServlet(urlPatterns = { NodeServiceServlet.SERVLET_PATH })
public class NodeServiceServlet extends HttpServlet {
private static final long serialVersionUID = -592774116315946908L;
public static final String NODE_HEADER = "node";
private static final String SERVLET_NAME = "node";
static final String SERVLET_PATH = "/" + SERVLET_NAME;
private static final String SERVICE = "service";
private static final String EXPECTED = "expected";
private static final int RETRIES = 10;
public static URI createURI(URL baseURL, ServiceName serviceName) throws URISyntaxException {
return baseURL.toURI().resolve(buildQuery(serviceName).toString());
}
public static URI createURI(URL baseURL, ServiceName serviceName, String expected) throws URISyntaxException {
return baseURL.toURI().resolve(buildQuery(serviceName).append('&').append(EXPECTED).append('=').append(expected).toString());
}
private static StringBuilder buildQuery(ServiceName serviceName) {
return new StringBuilder(SERVLET_NAME).append('?').append(SERVICE).append('=').append(serviceName.getCanonicalName());
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String serviceName = getRequiredParameter(req, SERVICE);
String expected = req.getParameter(EXPECTED);
this.log(String.format("Received request for %s, expecting %s", serviceName, expected));
@SuppressWarnings("unchecked")
ServiceController<Node> service = (ServiceController<Node>) CurrentServiceContainer.getServiceContainer().getService(ServiceName.parse(serviceName));
try {
Node node = service.awaitValue();
if (expected != null) {
for (int i = 0; i < RETRIES; ++i) {
if ((node != null) && expected.equals(node.getName())) break;
Thread.yield();
node = service.awaitValue();
}
}
if (node != null) {
resp.setHeader(NODE_HEADER, node.getName());
}
} catch (IllegalStateException e) {
// Thrown when quorum was not met
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
resp.getWriter().write("Success");
}
private static String getRequiredParameter(HttpServletRequest req, String name) throws ServletException {
String value = req.getParameter(name);
if (value == null) {
throw new ServletException(String.format("No %s specified", name));
}
return value;
}
}