/**
* JBoss, Home of Professional Open Source.
* Copyright 2013, 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.mod_cluster.undertow.metric;
import io.undertow.server.ExchangeCompletionListener;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import org.wildfly.mod_cluster.undertow.metric.jdk8backported.LongAdder;
/**
* {@link HttpHandler} implementation that counts number of active / running requests to replace the busyness
* metric.
*
* @author Radoslav Husar
* @version Aug 2013
* @since 8.0
*/
public class RunningRequestsHttpHandler implements HttpHandler {
private static final LongAdder runningCount = new LongAdder();
private final HttpHandler wrappedHandler;
public RunningRequestsHttpHandler(final HttpHandler handler) {
this.wrappedHandler = handler;
}
/**
* Increments the counter and registers a listener to decrement the counter upon exchange complete event.
*
* @param exchange
* @throws Exception
*/
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
runningCount.increment();
exchange.addExchangeCompleteListener(new ExchangeCompletionListener() {
@Override
public void exchangeEvent(HttpServerExchange exchange, NextListener nextListener) {
runningCount.decrement();
// Proceed to next listener must be called!
nextListener.proceed();
}
});
wrappedHandler.handleRequest(exchange);
}
public static int getRunningRequestCount() {
return runningCount.intValue();
}
}