package org.jgroups;
import org.jgroups.util.Streamable;
/**
* Header is a JGroups internal base class for all JGroups headers. Client normally do not need to
* interact with headers unless they are developing their custom protocols.
*
* @author Bela Ban
* @since 2.0
*/
public abstract class Header implements Streamable {
/**
* To be implemented by subclasses. Return the size of this object for the serialized version of it.
* I.e. how many bytes this object takes when flattened into a buffer. This may be different for each instance,
* or can be the same. This may also just be an estimation. E.g. FRAG uses it on Message to determine whether
* or not to fragment the message. Fragmentation itself will be accurate, because the entire message will actually
* be serialized into a byte buffer, so we can determine the exact size.
*/
public abstract int size();
public String toString() {
return '[' + getClass().getSimpleName() + "]";
}
}