feat(host): ClusterActivityEvaluator — oldest-member (singleton-host) active-node definition

2026-07-08 15:43:13 -04:00
parent 6b5c70dd19
commit 6320be9954
2 changed files with 96 additions and 0 deletions
@@ -0,0 +1,54 @@
+using Akka.Actor;
+using Akka.Configuration;
+using ZB.MOM.WW.ScadaBridge.Host.Health;
+
+namespace ZB.MOM.WW.ScadaBridge.Host.Tests;
+
+public class ClusterActivityEvaluatorTests : IAsyncLifetime
+{
+    private ActorSystem? _system;
+
+    public async Task InitializeAsync()
+    {
+        var port = FreePort();
+        var config = ConfigurationFactory.ParseString($@"
+akka {{
+    actor.provider = cluster
+    remote.dot-netty.tcp {{ hostname = ""127.0.0.1"", port = {port} }}
+    cluster {{
+        seed-nodes = [""akka.tcp://eval-test@127.0.0.1:{port}""]
+        roles = [""Central""]
+        min-nr-of-members = 1
+    }}
+}}");
+        _system = ActorSystem.Create("eval-test", config);
+        var cluster = Akka.Cluster.Cluster.Get(_system);
+        var deadline = DateTime.UtcNow.AddSeconds(20);
+        while (cluster.SelfMember.Status != Akka.Cluster.MemberStatus.Up && DateTime.UtcNow < deadline)
+            await Task.Delay(100);
+    }
+
+    public async Task DisposeAsync() { if (_system != null) await _system.Terminate(); }
+
+    [Fact]
+    public void SelfIsOldest_SoleUpMember_ReturnsTrue()
+    {
+        var cluster = Akka.Cluster.Cluster.Get(_system!);
+        Assert.True(ClusterActivityEvaluator.SelfIsOldest(cluster));
+        Assert.True(ClusterActivityEvaluator.SelfIsOldest(cluster, "Central"));
+    }
+
+    [Fact]
+    public void SelfIsOldest_RoleNotHeld_ReturnsFalse()
+    {
+        var cluster = Akka.Cluster.Cluster.Get(_system!);
+        // Self doesn't carry the role => it can never host that role's singletons.
+        Assert.False(ClusterActivityEvaluator.SelfIsOldest(cluster, "site-nonexistent"));
+    }
+
+    private static int FreePort()
+    {
+        var l = new System.Net.Sockets.TcpListener(System.Net.IPAddress.Loopback, 0);
+        l.Start(); var p = ((System.Net.IPEndPoint)l.LocalEndpoint).Port; l.Stop(); return p;
+    }
+}