/*
*
* 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.extension.io;
import java.util.HashMap;
import java.util.Map;
import org.jboss.msc.service.Service;
import org.jboss.msc.service.StartContext;
import org.jboss.msc.service.StartException;
import org.jboss.msc.service.StopContext;
/**
* Tracks all worker services.
*/
class MaxThreadTrackerService implements Service<Integer> {
private Map<String, Integer> workers = new HashMap<String, Integer>();
private volatile int total;
@Override
public void start(StartContext startContext) throws StartException {
// This is hackish but worker state is tracked independently of this service's lifecycle.
// Interaction is as follows:
// 1. IO Root add handler installs the service and registers a step handler
// 2. Child worker A add handler registers its max thread count, incrementing the total
// 3. Child worker B add handler registers its max thread count, incrementing the total
// 4. Root's follow-up step handler starts this service
// 5. Consumers of this service can now inject the total max thread count
}
@Override
public void stop(StopContext stopContext) {
}
void registerWorkerMax(String name, int max) {
synchronized (workers) {
Integer prev = workers.get(name);
if (prev != null) {
max -= prev.intValue();
}
workers.put(name, max);
total += max;
}
}
// Not needed until workers support dynamic removal (currently reload required)
void unregisterWorkerMax(String name) {
synchronized (workers) {
Integer val = workers.remove(name);
if (val != null) {
total -= val;
}
}
}
@Override
public Integer getValue() throws IllegalStateException, IllegalArgumentException {
return total;
}
}