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Add IsLeader property to ClusterInfo #182

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Merged
stidsborg merged 1 commit into from
Jul 4, 2026
Merged

Add IsLeader property to ClusterInfo #182

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14 changes: 12 additions & 2 deletions Core/Cleipnir.ResilientFunctions.Tests/TestTemplates/WatchDogsTests/ReplicaWatchdogTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -191,17 +191,21 @@ public async Task ReplicaIdOffsetIsUpdatedWhenNodeIsAddedAndDeleted(Task<IFuncti
var watchdog2 = new ReplicaWatchdog(cluster2, functionStore, heartbeatFrequency: TimeSpan.FromHours(1), utcNow: () => DateTime.UtcNow, unhandledExceptionHandler: default(UnhandledExceptionHandler)!);
var watchdog3 = new ReplicaWatchdog(cluster3, functionStore, heartbeatFrequency: TimeSpan.FromHours(1), utcNow: () => DateTime.UtcNow, unhandledExceptionHandler: default(UnhandledExceptionHandler)!);

cluster3.IsLeader.ShouldBeFalse();
await watchdog3.Initialize();
cluster3.Offset.ShouldBe((ulong) 0);
cluster3.ReplicaCount.ShouldBe((ulong) 1);
cluster3.IsLeader.ShouldBeTrue();

await watchdog2.Initialize();
await watchdog3.PerformIteration(utcNowTicks: 0);
cluster3.Offset.ShouldBe((ulong) 1);
cluster3.ReplicaCount.ShouldBe((ulong) 2);
cluster2.Offset.ShouldBe((ulong) 0);
cluster2.ReplicaCount.ShouldBe((ulong) 2);

cluster3.IsLeader.ShouldBeFalse();
cluster2.IsLeader.ShouldBeTrue();

await watchdog1.Initialize();
await watchdog2.PerformIteration(utcNowTicks: 0);
await watchdog3.PerformIteration(utcNowTicks: 1);
Expand All @@ -211,6 +215,9 @@ public async Task ReplicaIdOffsetIsUpdatedWhenNodeIsAddedAndDeleted(Task<IFuncti
cluster2.ReplicaCount.ShouldBe((ulong) 3);
cluster1.Offset.ShouldBe((ulong) 0);
cluster1.ReplicaCount.ShouldBe((ulong) 3);
cluster3.IsLeader.ShouldBeFalse();
cluster2.IsLeader.ShouldBeFalse();
cluster1.IsLeader.ShouldBeTrue();

await store.Delete(cluster1.ReplicaId);
await watchdog3.PerformIteration(utcNowTicks: 1);
Expand All @@ -219,11 +226,14 @@ public async Task ReplicaIdOffsetIsUpdatedWhenNodeIsAddedAndDeleted(Task<IFuncti
cluster3.ReplicaCount.ShouldBe((ulong) 2);
cluster2.Offset.ShouldBe((ulong) 0);
cluster2.ReplicaCount.ShouldBe((ulong) 2);

cluster3.IsLeader.ShouldBeFalse();
cluster2.IsLeader.ShouldBeTrue();

await store.Delete(cluster2.ReplicaId);
await watchdog3.PerformIteration(utcNowTicks: 2);
cluster3.Offset.ShouldBe((ulong) 0);
cluster3.ReplicaCount.ShouldBe((ulong) 1);
cluster3.IsLeader.ShouldBeTrue();
}

public abstract Task ActiveReplicasDoNotDeleteEachOther();
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10 changes: 10 additions & 0 deletions Core/Cleipnir.ResilientFunctions/Domain/ClusterInfo.cs
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Expand Up @@ -40,6 +40,16 @@ internal set
}
}

// The leader is the replica with the lowest id - i.e. the replica with offset 0 in the ascendingly ordered replica ids
public bool IsLeader
{
get
{
lock (_sync)
return _replicaCount > 0 && _offset == 0;
}
}

private readonly Lock _sync = new();

public bool OwnedByThisReplica(StoredId storedId)
Expand Down