/*
* JBoss, Home of Professional Open Source.
* Copyright 2017, 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.wildfly.extension.undertow;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import org.jboss.msc.service.Service;
import org.jboss.msc.service.StartContext;
import org.jboss.msc.service.StartException;
import org.jboss.msc.service.StopContext;
import org.jboss.msc.value.InjectedValue;
import org.wildfly.extension.undertow.logging.UndertowLogger;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* @author <a href="mailto:tomaz.cerar@redhat.com">Tomaz Cerar</a> (c) 2013 Red Hat Inc.
*/
public class LocationService implements Service<LocationService>, FilterLocation {
private final String locationPath;
private final InjectedValue<HttpHandler> httpHandler = new InjectedValue<>();
private final InjectedValue<Host> host = new InjectedValue<>();
private final CopyOnWriteArrayList<UndertowFilter> filters = new CopyOnWriteArrayList<>();
private final LocationHandler locationHandler = new LocationHandler();
private volatile HttpHandler configuredHandler;
public LocationService(String locationPath) {
this.locationPath = locationPath;
}
@Override
public void start(StartContext context) throws StartException {
UndertowLogger.ROOT_LOGGER.tracef("registering handler %s under path '%s'", httpHandler.getValue(), locationPath);
host.getValue().registerLocation(this);
}
@Override
public void stop(StopContext context) {
host.getValue().unregisterLocation(this);
}
@Override
public LocationService getValue() throws IllegalStateException, IllegalArgumentException {
return this;
}
InjectedValue<Host> getHost() {
return host;
}
InjectedValue<HttpHandler> getHttpHandler() {
return httpHandler;
}
String getLocationPath() {
return locationPath;
}
LocationHandler getLocationHandler() {
return locationHandler;
}
private HttpHandler configureHandler() {
ArrayList<UndertowFilter> filters = new ArrayList<>(this.filters);
return configureHandlerChain(getHttpHandler().getValue(), filters);
}
protected static HttpHandler configureHandlerChain(HttpHandler rootHandler, List<UndertowFilter> filters) {
filters.sort((o1, o2) -> o1.getPriority() >= o2.getPriority() ? 1 : -1);
Collections.reverse(filters); //handler chain goes last first
HttpHandler handler = rootHandler;
for (UndertowFilter filter : filters) {
handler = filter.wrap(handler);
}
return handler;
}
@Override
public void addFilter(UndertowFilter filterRef) {
filters.add(filterRef);
configuredHandler = null;
}
@Override
public void removeFilter(UndertowFilter filterRef) {
filters.remove(filterRef);
configuredHandler = null;
}
private class LocationHandler implements HttpHandler {
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
HttpHandler root = configuredHandler;
if(root == null) {
synchronized (LocationService.this) {
root = configuredHandler;
if(root == null) {
root = configuredHandler = configureHandler();
}
}
}
root.handleRequest(exchange);
}
}
}