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package org.activiti.engine.impl.persistence;
import org.activiti.engine.impl.cfg.IdGenerator;
import com.fasterxml.uuid.EthernetAddress;
import com.fasterxml.uuid.Generators;
import com.fasterxml.uuid.impl.TimeBasedGenerator;
/**
* {@link IdGenerator} implementation based on the current time and the ethernet
* address of the machine it is running on.
*
* @author Daniel Meyer
*/
public class StrongUuidGenerator implements IdGenerator {
// different ProcessEngines on the same classloader share one generator.
protected static TimeBasedGenerator timeBasedGenerator;
public StrongUuidGenerator() {
ensureGeneratorInitialized();
}
protected void ensureGeneratorInitialized() {
if (timeBasedGenerator == null) {
synchronized (StrongUuidGenerator.class) {
if (timeBasedGenerator == null) {
timeBasedGenerator = Generators.timeBasedGenerator(EthernetAddress.fromInterface());
}
}
}
}
public String getNextId() {
return timeBasedGenerator.generate().toString();
}
}