org.jgroups.DefaultMessageFactory Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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package org.jgroups;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.function.Supplier;
/**
* Default implementation of {@link MessageFactory}. Uses an array for message IDs less then 32, and a hashmap for
* types above 32
* @author Bela Ban
* @since 5.0
*/
public class DefaultMessageFactory implements MessageFactory {
protected static final byte MIN_TYPE=32;
protected final Supplier[] creators=new Supplier[MIN_TYPE];
protected Map> map=new HashMap<>();
public DefaultMessageFactory() {
creators[Message.BYTES_MSG]=BytesMessage::new;
creators[Message.NIO_MSG]=NioMessage::new;
creators[Message.EMPTY_MSG]=EmptyMessage::new;
creators[Message.OBJ_MSG]=ObjectMessage::new;
creators[Message.LONG_MSG]=LongMessage::new;
creators[Message.COMPOSITE_MSG]=CompositeMessage::new;
creators[Message.FRAG_MSG]=FragmentedMessage::new;
creators[Message.EARLYBATCH_MSG]=BatchMessage::new;
}
public T create(short type) {
Supplier creator=type < MIN_TYPE? creators[type] : map.get(type);
if(creator == null)
throw new IllegalArgumentException("no creator found for type " + type);
return (T)creator.get();
}
public T register(short type, Supplier generator) {
Objects.requireNonNull(generator, "the creator must be non-null");
if(type < MIN_TYPE)
throw new IllegalArgumentException(String.format("type (%d) must be >= 32", type));
if(map.containsKey(type))
throw new IllegalArgumentException(String.format("type %d is already taken", type));
map.put(type, generator);
return (T)this;
}
}