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DerivationState.cs
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DerivationState.cs
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// <copyright file="DerivationState.cs" company="Michel Weststrate, Jan-Willem Spuij">
// Copyright 2019 Michel Weststrate, Jan-Willem Spuij
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom
// the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// </copyright>
namespace Cortex.Net
{
/// <summary>
/// The state of the <see cref="IDerivation"/> instance.
/// </summary>
public enum DerivationState
{
/// <summary>
/// Before being run or (outside batch and not being observed).
/// at this point derivation is not holding any data about dependency tree
/// </summary>
NotTracking = -1,
/// <summary>
/// No shallow dependency changed since last computation.
/// We won't recalculate the derivation.
/// This is what makes Cortex.Net fast.
/// </summary>
UpToDate = 0,
/// <summary>
/// Some deep dependency has changed, but we don't know if a shallow dependency has changed.
/// This will require to check first if this derivation is UpToDate or PossiblyStale.
/// Currently only ComputedValue will propagate PossiblyStale.
///
/// Having this state is the second big optimization:
/// We don't have to recompute on every dependency change, but only when it's necessary.
/// </summary>
PossiblyStale = 1,
/// <summary>
/// A shallow dependency has changed since last computation and the derivation
/// will need to recompute when it's necessary next.
/// </summary>
Stale = 2,
}
}