@Test
public void demonstrateLWWRegister() {
// #lwwregister
final Cluster node = Cluster.get(system);
final LWWRegister<String> r1 = LWWRegister.create(node, "Hello");
final LWWRegister<String> r2 = r1.withValue(node, "Hi");
System.out.println(r1.value() + " by " + r1.updatedBy() + " at " + r1.timestamp());
// #lwwregister
assertEquals("Hi", r2.value());
}
public void demonstrateLWWRegisterWithCustomClock() {
// #lwwregister-custom-clock
final Cluster node = Cluster.get(system);
final LWWRegister.Clock<Record> recordClock =
new LWWRegister.Clock<Record>() {
@Override
public long apply(long currentTimestamp, Record value) {
return value.version;
}
};
final Record record1 = new Record(1, "Alice", "Union Square");
final LWWRegister<Record> r1 = LWWRegister.create(node, record1);
final Record record2 = new Record(2, "Alice", "Madison Square");
final LWWRegister<Record> r2 = LWWRegister.create(node, record2);
final LWWRegister<Record> r3 = r1.merge(r2);
System.out.println(r3.value());
// #lwwregister-custom-clock
assertEquals("Madison Square", r3.value().address);
}