/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.undertow.protocols.alpn;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.ServiceLoader;
import javax.net.ssl.SSLEngine;
/**
* @author Stuart Douglas
*/
public class ALPNManager {
private final List<ALPNProvider> alpnProviders;
public static final ALPNManager INSTANCE = new ALPNManager(ALPNManager.class.getClassLoader());
public ALPNManager(ClassLoader classLoader) {
ServiceLoader<ALPNProvider> loader = ServiceLoader.load(ALPNProvider.class, classLoader);
List<ALPNProvider> provider = new ArrayList<>();
for(ALPNProvider prov : loader) {
provider.add(prov);
}
Collections.sort(provider, new Comparator<ALPNProvider>() {
@Override
public int compare(ALPNProvider o1, ALPNProvider o2) {
return Integer.compare(o2.getPriority(), o1.getPriority()); //highest first
}
});
this.alpnProviders = Collections.unmodifiableList(provider);
}
public ALPNProvider getProvider(SSLEngine engine) {
for(ALPNProvider provider: alpnProviders) {
if(provider.isEnabled(engine)) {
return provider;
}
}
return null;
}
}