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src/Scanner/__Libraries/StellaOps.Scanner.Reachability/ReachabilityUnionPublisherService.cs

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+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using StellaOps.Scanner.Cache.Abstractions;
+using StellaOps.Scanner.Surface.Env;
+
+namespace StellaOps.Scanner.Reachability;
+
+public interface IReachabilityUnionPublisherService
+{
+    Task<ReachabilityUnionPublishResult> PublishAsync(ReachabilityUnionGraph graph, string analysisId, CancellationToken cancellationToken = default);
+}
+
+/// <summary>
+/// Default service that writes a union graph to CAS using the worker surface cache root.
+/// </summary>
+public sealed class ReachabilityUnionPublisherService : IReachabilityUnionPublisherService
+{
+    private readonly ISurfaceEnvironment environment;
+    private readonly IFileContentAddressableStore cas;
+    private readonly ReachabilityUnionPublisher publisher;
+
+    public ReachabilityUnionPublisherService(
+        ISurfaceEnvironment environment,
+        IFileContentAddressableStore cas,
+        ReachabilityUnionPublisher publisher)
+    {
+        this.environment = environment ?? throw new ArgumentNullException(nameof(environment));
+        this.cas = cas ?? throw new ArgumentNullException(nameof(cas));
+        this.publisher = publisher ?? throw new ArgumentNullException(nameof(publisher));
+    }
+
+    public Task<ReachabilityUnionPublishResult> PublishAsync(ReachabilityUnionGraph graph, string analysisId, CancellationToken cancellationToken = default)
+    {
+        var workRoot = Path.Combine(environment.Settings.CacheRoot.FullName, "reachability");
+        Directory.CreateDirectory(workRoot);
+        return publisher.PublishAsync(graph, cas, workRoot, analysisId, cancellationToken);
+    }
+}