org.jgroups.EmptyMessage 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 org.jgroups.util.ByteArray;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.function.Supplier;
/**
* A {@link Message} without a payload; optimized for sending only headers (e.g. heartbeats in failure detection)
* @author Bela Ban
* @since 5.0
*/
public class EmptyMessage extends BaseMessage {
public EmptyMessage() {
}
public EmptyMessage(Address dest) {
super(dest);
}
public short getType() {return Message.EMPTY_MSG;}
public Supplier create() {return EmptyMessage::new;}
public boolean hasPayload() {return false;}
public boolean hasArray() {return false;}
public byte[] getArray() {return null;}
public int getOffset() {return 0;}
public int getLength() {return 0;}
public EmptyMessage setArray(byte[] b, int off, int len) {return this;}
public EmptyMessage setArray(ByteArray buf) {return this;}
public T getObject() {return null;}
public EmptyMessage setObject(Object obj) {return this;}
public void writePayload(DataOutput out) throws IOException {
// no payload to write
}
public void readPayload(DataInput in) throws IOException, ClassNotFoundException {
// no payload to read
}
}