public void LWWRegister_must_merge_by_picking_max_timestamp()
{
var i = From(100).GetEnumerator();
Clock <string> clock = (timestamp, value) =>
{
i.MoveNext();
return(i.Current);
};
var r1 = new LWWRegister <string>(_node1, "A", clock);
Assert.Equal(100, r1.Timestamp);
var r2 = new LWWRegister <string>(_node2, "B", clock);
Assert.Equal(101, r2.Timestamp);
var m1 = r1.Merge(r2);
Assert.Equal("B", m1.Value);
Assert.Equal(101, m1.Timestamp);
var m2 = r2.Merge(r1);
Assert.Equal("B", m2.Value);
Assert.Equal(101, m2.Timestamp);
}
public void LWWRegister_must_merge_by_picking_least_address_when_same_timestamp()
{
Clock <string> clock = (timestamp, value) => 100;
var r1 = new LWWRegister <string>(_node1, "A", clock);
var r2 = new LWWRegister <string>(_node2, "B", clock);
var m1 = r1.Merge(r2);
Assert.Equal("A", m1.Value);
var m2 = r2.Merge(r1);
Assert.Equal("A", m2.Value);
}
/// <summary> /// Creates an instance of an LWWRegister scoped to a current cluster. /// </summary> /// <typeparam name="TVal">TBD</typeparam> /// <param name="cluster">TBD</param> /// <param name="register">TBD</param> /// <returns>TBD</returns> public static LocalLWWRegister <TVal> LWWRegister <TVal>(this Cluster.Cluster cluster, LWWRegister <TVal> register) => new LocalLWWRegister <TVal>(cluster, register);
/// <summary>
/// TBD
/// </summary>
/// <param name="cluster">TBD</param>
/// <param name="crdt">TBD</param>
public LocalLWWRegister(Cluster.Cluster cluster, LWWRegister <T> crdt) : this(cluster.SelfUniqueAddress, crdt)
{
}
/// <summary>
/// TBD
/// </summary>
/// <param name="currentNode">TBD</param>
/// <param name="crdt">TBD</param>
internal LocalLWWRegister(UniqueAddress currentNode, LWWRegister <T> crdt) : this()
{
_currentNode = currentNode;
_crdt = crdt;
}
/// <summary>
/// TBD
/// </summary>
/// <param name="register">TBD</param>
public Surrogate(LWWRegister <T> register)
{
this.register = register;
}
/// <summary>
/// Merges data from provided <see cref="LWWRegister{T}"/> into current CRDT,
/// creating new immutable instance in a result.
/// </summary>
/// <param name="register">TBD</param>
/// <returns>TBD</returns>
public LocalLWWRegister <T> Merge(LWWRegister <T> register) =>
new LocalLWWRegister <T>(_currentNode, _crdt.Merge(register));