public void TestDynamic2()
{
var x = ObservableValue <int> .From(3);
var xreader = x as IValueReader <int>;
var xwriter = x as IValueWriter <int>;
var y = ComputedValue <int> .From(() => xreader.Value *xreader.Value);
Assert.Equal(9, y.Value);
var values = new List <int>();
var diposable = y.Observe(change =>
{
values.Add(change.NewValue);
});
xwriter.Value = 5;
Assert.Equal(25, y.Value);
Assert.Single(values);
Assert.Equal(25, values[0]);
}
public void TestActionModificationPickup3()
{
var a = ObservableValue <int> .From(1);
var b = 0;
var doubler = ComputedValue <int> .From(() => a.Value * 2);
doubler.Observe(change =>
{
b = doubler.Value;
}, true);
Assert.Equal(2, b);
var action = Actions.CreateAction("action", () =>
{
a.Value = a.Value + 1; // ha, no loop!
});
action();
Assert.Equal(4, b);
action();
Assert.Equal(6, b);
}
public void TestDynamic()
{
var x = ObservableValue <int> .From(3);
var xreader = x as IValueReader <int>;
var xwriter = x as IValueWriter <int>;
var y = ComputedValue <int> .From(() => xreader.Value);
var values = new List <int>();
var diposable = y.Observe(change =>
{
values.Add(change.NewValue);
}, true);
Assert.Equal(3, y.Value);
xwriter.Value = 5;
Assert.Equal(5, y.Value);
Assert.Equal(2, values.Count);
Assert.Equal(3, values[0]);
Assert.Equal(5, values[1]);
}
private void PreCompute()
{
_Path = ComputedValue <string> .From(() =>
{
if (Parent == null)
{
return("");
}
return($"{Parent.Path}/{Subpath.EscapeJsonPath()}");
});
_Value = ComputedValue <object> .From(() =>
{
if (!IsAlive)
{
return(null);
}
return(Type.GetValue(this));
});
_Snapshot = ComputedValue <object> .From(() =>
{
if (!IsAlive)
{
return(null);
}
return(Type.GetSnapshot(this, false));
});
}
public Order()
{
Vat = ObservableValue <double> .From(0.2);
Price = ObservableValue <double> .From(10);
PriceWithVat = ComputedValue <double> .From(() => (Price as IValueReader <double>).Value *(1 + (Vat as IValueReader <double>).Value));
}
public void TestAllowModificationInComputed()
{
var a = ObservableValue <int> .From(2);
var d = Reactions.Autorun(() => { var x = a.Value; });
IComputedValue <int> c2 = null;
var action = Actions.CreateAction("action", () =>
{
Actions.AllowStateChangesInsideComputed(() =>
{
a.Value = 3;
//// a second level computed should throw
Assert.Throws <CaughtException>(() =>
{
// /Computed values are not allowed to cause side effects by changing observables that are already being observed/
var x = c2.Value;
});
});
Assert.Equal(3, a.Value);
Assert.Throws <Exception>(() =>
{
// /Computed values are not allowed to cause side effects by changing observables that are already being observed/
a.Value = 4;
});
});
var c = ComputedValue <int> .From(() =>
{
action();
return(a.Value);
});
c2 = ComputedValue <int> .From(() => {
a.Value = 6;
return(a.Value);
});
var _ = c.Value;
d.Dispose();
}
public void TestAutorun2()
{
var list = ObservableList <int> .From(new[] { 4, 2, 3 });
List <int> sorted = null;
var sortedX = ComputedValue <List <int> > .From(() =>
{
var splice = list.ToList();
splice.Sort();
return(splice);
});
Reactions.Autorun((r) =>
{
sorted = sortedX.Value;
});
Assert.Equal(4, list[0]);
Assert.Equal(2, list[1]);
Assert.Equal(3, list[2]);
Assert.Equal(2, sorted[0]);
Assert.Equal(3, sorted[1]);
Assert.Equal(4, sorted[2]);
list.Add(1);
Assert.Equal(4, list[0]);
Assert.Equal(2, list[1]);
Assert.Equal(3, list[2]);
Assert.Equal(1, list[3]);
Assert.Equal(1, sorted[0]);
Assert.Equal(2, sorted[1]);
Assert.Equal(3, sorted[2]);
Assert.Equal(4, sorted[3]);
list.Shift();
Assert.Equal(2, list[0]);
Assert.Equal(3, list[1]);
Assert.Equal(1, list[2]);
Assert.Equal(1, sorted[0]);
Assert.Equal(2, sorted[1]);
Assert.Equal(3, sorted[2]);
}
public void TestBatch()
{
var a = ObservableValue <int> .From(2);
var b = ObservableValue <int> .From(3);
var areader = a as IValueReader <int>;
var awriter = a as IValueWriter <int>;
var breader = b as IValueReader <int>;
var bwriter = b as IValueWriter <int>;
var c = ComputedValue <int> .From(() => areader.Value *breader.Value);
var d = ComputedValue <int> .From(() => c.Value *breader.Value);
var values = new List <int>();
var diposable = d.Observe(change =>
{
values.Add(change.NewValue);
});
awriter.Value = 4;
bwriter.Value = 5;
// Note, 60 should not happen! (that is d beign computed before c after update of b)
Assert.Equal(2, values.Count);
Assert.Equal(36, values[0]);
Assert.Equal(100, values[1]);
var x = Reactions.Transaction <int>(() =>
{
awriter.Value = 2;
bwriter.Value = 3;
awriter.Value = 6;
Assert.Equal(54, d.Value);
return(2);
});
Assert.Equal(2, x);
Assert.Equal(3, values.Count);
Assert.Equal(36, values[0]);
Assert.Equal(100, values[1]);
Assert.Equal(54, values[2]);
}
public void TestComputed()
{
var box = ObservableValue <int> .From(3);
var reader = box as IValueReader <int>;
var writer = box as IValueWriter <int>;
var x = ComputedValue <int> .From(() => reader.Value * 2);
var y = ComputedValue <int> .From(() => reader.Value * 3);
Assert.Equal(6, x.Value);
Assert.Equal(9, y.Value);
writer.Value = 5;
Assert.Equal(10, x.Value);
Assert.Equal(15, y.Value);
}
internal StoredReference(StoreType type, object value, IType targetType)
{
Type = type;
Value = value;
TargetType = targetType;
if (Type == StoreType.Object)
{
if (!value.IsStateTreeNode())
{
throw new ArgumentException($"Can only store references to tree nodes, got: '{value}'");
}
var node = value.GetStateTreeNode();
if (string.IsNullOrWhiteSpace(node.IdentifierAttribute))
{
throw new ArgumentException("Can only store references with a defined identifier attribute.");
}
}
_resolvedValue = ComputedValue <object> .From(() =>
{
var identifier = Value?.ToString();
if (string.IsNullOrWhiteSpace(identifier))
{
return(null);
}
// reference was initialized with the identifier of the target
var target = Node.Root.IdentifierCache?.Resolve(TargetType, identifier);
if (target == null)
{
throw new Exception($"Failed to resolve reference '{identifier}' to type '{TargetType.Name}' (from node: {Node.Path})");
}
return(target?.Value);
});
}
private void PreCompute()
{
_Value = ComputedValue <object> .From(() =>
{
if (!IsAlive)
{
return(null);
}
return(Type.GetValue(this));
});
_Snapshot = ComputedValue <object> .From(() =>
{
if (!IsAlive)
{
return(null);
}
return(Type.GetSnapshot(this, false));
});
}
public void TestTransaction()
{
var x1 = ObservableValue <int> .From(3);
var x2 = ObservableValue <int> .From(5);
var x1reader = x1 as IValueReader <int>;
var x1writer = x1 as IValueWriter <int>;
var x2reader = x2 as IValueReader <int>;
var x2writer = x2 as IValueWriter <int>;
var y = ComputedValue <int> .From(() => x1reader.Value + x2reader.Value);
var values = new List <int>();
var diposable = y.Observe(change =>
{
values.Add(change.NewValue);
}, true);
Assert.Equal(8, y.Value);
x1writer.Value = 4;
Assert.Equal(9, y.Value);
Reactions.Transaction(() =>
{
x1writer.Value = 5;
x2writer.Value = 6;
});
Assert.Equal(11, y.Value);
Assert.Equal(3, values.Count);
Assert.Equal(8, values[0]);
Assert.Equal(9, values[1]);
Assert.Equal(11, values[2]);
}
public void TestAutorunInActionDoesNotKeepComputedAlive()
{
var calls = 0;
var computed = ComputedValue <int> .From(() => calls ++);
Action callComputedTwice = () =>
{
var x = computed.Value;
var y = computed.Value;
};
Action <Action> runWithMemoizing = (fun) =>
{
Reactions.Autorun(fun).Dispose();
};
callComputedTwice();
Assert.Equal(2, calls);
runWithMemoizing(callComputedTwice);
Assert.Equal(3, calls);
callComputedTwice();
Assert.Equal(5, calls);
runWithMemoizing(() =>
{
Actions.RunInAction <int>("x", () =>
{
callComputedTwice();
return(0);
});
});
Assert.Equal(6, calls);
callComputedTwice();
Assert.Equal(8, calls);
}
public void TestModificationInComputed()
{
var a = ObservableValue <int> .From(2);
var action = Actions.CreateAction("action", () =>
{
a.Value = 3;
});
var c = ComputedValue <object> .From(() =>
{
action();
return(null);
});
var d = Reactions.Autorun(() =>
{
// expect not to throws
var x = c.Value;
});
d.Dispose();
}
public void TestModificationErrorInComputed()
{
var a = ObservableValue <int> .From(2);
var d = Reactions.Autorun(() => { var x = a.Value; });
var action = Actions.CreateAction("action", () =>
{
a.Value = 3;
});
var c = ComputedValue <int> .From(() =>
{
action();
return(a.Value);
});
Assert.Throws <Exception>(() =>
{
var x = c.Value;
});
d.Dispose();
}
public void TestComputedAutorun()
{
var box = ObservableValue <int> .From(3);
var reader = box as IValueReader <int>;
var writer = box as IValueWriter <int>;
var x = ComputedValue <int> .From(() => reader.Value * 2);
var values = new List <int>();
Reactions.Autorun((reaction) =>
{
values.Add(x.Value);
});
writer.Value = 5;
writer.Value = 10;
Assert.Equal(3, values.Count);
Assert.Equal(6, values[0]);
Assert.Equal(10, values[1]);
Assert.Equal(20, values[2]);
}
public void TestTransactionInspection()
{
var a = ObservableValue <int> .From(2);
var areader = a as IValueReader <int>;
var awriter = a as IValueWriter <int>;
var calcs = 0;
var b = ComputedValue <int> .From(() =>
{
calcs++;
return(areader.Value * 2);
});
// if not inspected during transaction, postpone value to end
Reactions.Transaction(() =>
{
awriter.Value = 3;
Assert.Equal(6, b.Value);
Assert.Equal(1, calcs);
});
Assert.Equal(6, b.Value);
Assert.Equal(2, calcs);
// if inspected, evaluate eagerly
Reactions.Transaction(() =>
{
awriter.Value = 4;
Assert.Equal(8, b.Value);
Assert.Equal(3, calcs);
});
Assert.Equal(8, b.Value);
Assert.Equal(4, calcs);
}
public void TestComputedValuesAndAction()
{
var calls = 0;
var number = ObservableValue <int> .From(1);
var squared = ComputedValue <int> .From(() =>
{
calls++;
return(number.Value *number.Value);
});
var changeNumber10Times = Actions.CreateAction("changeNumber10Times", () =>
{
var x = squared.Value;
var y = squared.Value;
for (int i = 0; i < 10; i++)
{
number.Value = number.Value + 1;
}
});
changeNumber10Times();
Assert.Equal(1, calls);
Reactions.Autorun(r =>
{
changeNumber10Times();
Assert.Equal(2, calls);
});
Assert.Equal(2, calls);
changeNumber10Times();
Assert.Equal(3, calls);
}
public void TestSetup()
{
var list = ObservableList <int> .From();
Assert.Empty(list);
list.Add(1);
Assert.Single(list);
Assert.Equal(1, list[0]);
list[1] = 2;
Assert.Equal(2, list.Length);
Assert.Equal(1, list[0]);
Assert.Equal(2, list[1]);
var compute = ComputedValue <int> .From(() =>
{
return(-1 + list.Aggregate(1, (acc, curr) => acc + curr));
});
Assert.Equal(3, compute.Value);
list[1] = 3;
Assert.Equal(2, list.Length);
Assert.Equal(1, list[0]);
Assert.Equal(3, list[1]);
Assert.Equal(4, compute.Value);
list.Splice(1, 1, 4, 5);
Assert.Equal(3, list.Length);
Assert.Equal(1, list[0]);
Assert.Equal(4, list[1]);
Assert.Equal(5, list[2]);
Assert.Equal(10, compute.Value);
list.Replace(new[] { 2, 4 });
Assert.Equal(2, list.Length);
Assert.Equal(2, list[0]);
Assert.Equal(4, list[1]);
Assert.Equal(6, compute.Value);
list.Splice(1, 1);
Assert.Equal(1, list.Length);
Assert.Equal(2, list[0]);
Assert.Equal(2, compute.Value);
list.Splice(0, 0, new[] { 4, 3 });
Assert.Equal(3, list.Length);
Assert.Equal(4, list[0]);
Assert.Equal(3, list[1]);
Assert.Equal(2, list[2]);
Assert.Equal(9, compute.Value);
list.Clear();
Assert.Empty(list);
Assert.Equal(0, compute.Value);
list.Length = 4;
Assert.Equal(4, list.Length);
Assert.Equal(0, compute.Value);
list.Replace(new[] { 1, 2, 2, 4 });
Assert.Equal(4, list.Length);
Assert.Equal(9, compute.Value);
list.Length = 4;
Assert.Equal(4, list.Length);
Assert.Equal(9, compute.Value);
list.Length = 2;
Assert.Equal(2, list.Length);
Assert.Equal(3, compute.Value);
Assert.Equal(1, list[0]);
Assert.Equal(2, list[1]);
list.Unshift(3);
Assert.Equal(3, list.Length);
Assert.Equal(6, compute.Value);
Assert.Equal(3, list[0]);
Assert.Equal(1, list[1]);
Assert.Equal(2, list[2]);
list[2] = 4;
Assert.Equal(3, list.Length);
Assert.Equal(8, compute.Value);
Assert.Equal(3, list[0]);
Assert.Equal(1, list[1]);
Assert.Equal(4, list[2]);
}
public bool TryGetComputedValue(string calculationConfiguration, ValueRequirement valueRequirement, out ComputedValue result)
{
result = null;
ViewCalculationResultModel model;
if (!_configurationMap.TryGetValue(calculationConfiguration, out model))
{
return(false);
}
ISet <ComputedValue> values;
if (!model.TryGetAllValues(valueRequirement.TargetSpecification, out values))
{
return(false);
}
var computedValues = values.Where(v => valueRequirement.IsSatisfiedBy(v.Specification));
result = computedValues.FirstOrDefault();
return(result != null);
}
public ViewResultEntry(string calculationConfiguration, ComputedValue computedValue)
{
_calculationConfiguration = calculationConfiguration;
_computedValue = computedValue;
}