/*
* JBoss, Home of Professional Open Source
* Copyright 2011 Red Hat Inc. and/or its affiliates and other contributors
* as indicated by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.jboss.arquillian.core.impl.loadable;
import java.util.Collection;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jboss.arquillian.core.api.Injector;
import org.jboss.arquillian.core.api.Instance;
import org.jboss.arquillian.core.api.InstanceProducer;
import org.jboss.arquillian.core.api.annotation.ApplicationScoped;
import org.jboss.arquillian.core.api.annotation.Inject;
import org.jboss.arquillian.core.api.annotation.Observes;
import org.jboss.arquillian.core.spi.ExtensionLoader;
import org.jboss.arquillian.core.spi.LoadableExtension;
import org.jboss.arquillian.core.spi.LoadableExtension.ExtensionBuilder;
import org.jboss.arquillian.core.spi.ServiceLoader;
import org.jboss.arquillian.core.spi.context.Context;
import org.jboss.arquillian.core.spi.event.ManagerProcessing;
/**
* LoadableExtensionLoader
*
* @author <a href="mailto:aslak@redhat.com">Aslak Knutsen</a>
* @version $Revision: $
*/
public class LoadableExtensionLoader
{
private static Logger log = Logger.getLogger(LoadableExtensionLoader.class.getName());
private static Level level = Level.FINER;
@Inject
private Instance<Injector> injector;
@Inject @ApplicationScoped
private InstanceProducer<ServiceLoader> serviceLoaderProducer;
private JavaSPIExtensionLoader serviceLoader;
public LoadableExtensionLoader()
{
this(new JavaSPIExtensionLoader());
}
LoadableExtensionLoader(JavaSPIExtensionLoader serviceLoader)
{
this.serviceLoader = serviceLoader;
}
public void load(@Observes final ManagerProcessing event)
{
ExtensionLoader extensionLoader = locateExtensionLoader();
final ServiceRegistry registry = new ServiceRegistry(injector.get());
Collection<LoadableExtension> extensions = extensionLoader.load();
for(LoadableExtension extension : extensions)
{
log.log(level, "extension: {0}", new Object[]{extension.getClass().getSimpleName()});
extension.register(new ExtensionBuilder()
{
@Override
public <T> ExtensionBuilder service(Class<T> service, Class<? extends T> impl)
{
log.log(level, "\tservice: {0} - {1}", new Object[]{service, impl});
registry.addService(service, impl);
return this;
}
@Override
public <T> ExtensionBuilder override(Class<T> service, Class<? extends T> oldServiceImpl, Class<? extends T> newServiceImpl)
{
log.log(level, "\toverride: {0} overrides {1} for {2}", new Object[]{newServiceImpl, oldServiceImpl, service});
registry.overrideService(service, oldServiceImpl, newServiceImpl);
return this;
}
@Override
public ExtensionBuilder observer(Class<?> handler)
{
log.log(level, "\tobserver: {0}", new Object[]{handler});
event.observer(handler);
return this;
}
@Override
public ExtensionBuilder context(Class<? extends Context> context)
{
log.log(level, "\tcontext: {0}", new Object[]{context});
event.context(context);
return this;
}
});
}
serviceLoaderProducer.set(registry.getServiceLoader());
}
/**
* Some environments need to handle their own ExtensionLoading and can't rely on Java's META-INF/services approach.
*
* @return configured ExtensionLoader if found or defaults to JavaSPIServiceLoader
*/
private ExtensionLoader locateExtensionLoader()
{
//Collection<ExtensionLoader> loaders = serviceLoader.all(LoadableExtensionLoader.class.getClassLoader(), ExtensionLoader.class);
Collection<ExtensionLoader> loaders = serviceLoader.all(SecurityActions.getThreadContextClassLoader(), ExtensionLoader.class);
if(loaders.size() == 0)
{
loaders = serviceLoader.all(LoadableExtensionLoader.class.getClassLoader(), ExtensionLoader.class);
}
if(loaders.size() > 1)
{
throw new RuntimeException("Multiple ExtensionLoader's found on classpath: " + toString(loaders));
}
if(loaders.size() == 1)
{
return loaders.iterator().next();
}
return serviceLoader;
}
private String toString(Collection<ExtensionLoader> loaders)
{
StringBuilder sb = new StringBuilder();
for(ExtensionLoader loader : loaders)
{
sb.append(loader.getClass().getName()).append(", ");
}
return sb.toString();
}
}