/*
* JBoss, Home of Professional Open Source.
* Copyright 2015, 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.clustering.marshalling.jboss;
import java.io.IOException;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.ServiceLoader;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import org.jboss.marshalling.Marshaller;
import org.jboss.marshalling.ObjectTable;
import org.jboss.marshalling.Unmarshaller;
import org.wildfly.clustering.marshalling.Externalizer;
import org.wildfly.clustering.marshalling.spi.IndexExternalizer;
/**
* {@link ObjectTable} implementation that dynamically loads {@link Externalizer} instances available from a given {@link ClassLoader}.
* @author Paul Ferraro
*/
public class ExternalizerObjectTable implements ObjectTable {
private final Externalizer<?>[] externalizers;
private final Map<Class<?>, Writer> writers = new IdentityHashMap<>();
private final IndexExternalizer indexExternalizer;
public ExternalizerObjectTable(ClassLoader loader) {
this(Stream.concat(loadExternalizers(ExternalizerObjectTable.class.getClassLoader()), loadExternalizers(loader)).toArray(Externalizer[]::new));
}
@SuppressWarnings("rawtypes")
private static Stream<Externalizer> loadExternalizers(ClassLoader loader) {
return StreamSupport.stream(ServiceLoader.load(Externalizer.class, loader).spliterator(), false);
}
public ExternalizerObjectTable(Externalizer<?>... externalizers) {
this(IndexExternalizer.select(externalizers.length), externalizers);
}
private ExternalizerObjectTable(IndexExternalizer indexExternalizer, Externalizer<?>... externalizers) {
this.indexExternalizer = indexExternalizer;
this.externalizers = externalizers;
for (int i = 0; i < externalizers.length; ++i) {
@SuppressWarnings("unchecked")
final Externalizer<Object> externalizer = (Externalizer<Object>) externalizers[i];
final int index = i;
Class<?> targetClass = externalizer.getTargetClass();
if (!this.writers.containsKey(targetClass)) {
Writer writer = new Writer() {
@Override
public void writeObject(Marshaller marshaller, Object object) throws IOException {
indexExternalizer.writeData(marshaller, index);
externalizer.writeObject(marshaller, object);
}
};
this.writers.put(targetClass, writer);
}
}
}
@Override
public Writer getObjectWriter(final Object object) throws IOException {
Class<?> targetClass = object.getClass();
return this.writers.get(targetClass.isEnum() ? ((Enum<?>) object).getDeclaringClass() : targetClass);
}
@Override
public Object readObject(Unmarshaller unmarshaller) throws IOException, ClassNotFoundException {
int index = this.indexExternalizer.readData(unmarshaller);
if (index >= this.externalizers.length) {
throw new IllegalStateException();
}
return this.externalizers[index].readObject(unmarshaller);
}
}