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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| using static Bootsharp.Instances; | ||
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| namespace Bootsharp.Common.Test; | ||
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| public class InstancesTest | ||
| { | ||
| [Fact] | ||
| public void ThrowsWhenGettingUnregisteredInstance () | ||
| { | ||
| Assert.Throws<Error>(() => Get(0)); | ||
| } | ||
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| [Fact] | ||
| public void ThrowsWhenDisposingUnregisteredInstance () | ||
| { | ||
| Assert.Throws<Error>(() => Dispose(0)); | ||
| } | ||
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| [Fact] | ||
| public void CanRegisterGetAndDisposeInstance () | ||
| { | ||
| var instance = new object(); | ||
| var id = Register(instance); | ||
| Assert.Same(instance, Get(id)); | ||
| Dispose(id); | ||
| Assert.Throws<Error>(() => Get(id)); | ||
| } | ||
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| [Fact] | ||
| public void GeneratesUniqueIdsOnEachRegister () | ||
| { | ||
| Assert.NotEqual(Register(new object()), Register(new object())); | ||
| } | ||
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| [Fact] | ||
| public void ReusesIdOfDisposedInstance () | ||
| { | ||
| var id = Register(new object()); | ||
| Dispose(id); | ||
| Assert.Equal(id, Register(new object())); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| namespace Bootsharp; | ||
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| /// <summary> | ||
| /// Manages exported (C# -> JavaScript) instanced interop interfaces. | ||
| /// </summary> | ||
| public static class Instances | ||
| { | ||
| private static readonly Dictionary<int, object> idToInstance = []; | ||
| private static readonly Queue<int> idPool = []; | ||
| private static int nextId = int.MinValue; | ||
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| /// <summary> | ||
| /// Registers specified interop instance and associates it with unique ID. | ||
| /// </summary> | ||
| /// <param name="instance">The instance to register.</param> | ||
| /// <returns>Unique ID associated with the registered instance.</returns> | ||
| public static int Register (object instance) | ||
| { | ||
| var id = idPool.Count > 0 ? idPool.Dequeue() : nextId++; | ||
| idToInstance[id] = instance; | ||
| return id; | ||
| } | ||
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| /// <summary> | ||
| /// Resolves registered instance by the specified ID. | ||
| /// </summary> | ||
| /// <param name="id">Unique ID of the instance to resolve.</param> | ||
| public static object Get (int id) | ||
| { | ||
| if (!idToInstance.TryGetValue(id, out var instance)) | ||
| throw new Error($"Failed to resolve exported interop instance with '{id}' ID: not registered."); | ||
| return instance; | ||
| } | ||
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| /// <summary> | ||
| /// Notifies that interop instance is no longer used on JavaScript side | ||
| /// (eg, was garbage collected) and can be released on C# side as well. | ||
| /// </summary> | ||
| /// <param name="id">ID of the disposed interop instance.</param> | ||
| public static void Dispose (int id) | ||
| { | ||
| if (!idToInstance.Remove(id)) | ||
| throw new Error($"Failed to dispose exported interop instance with '{id}' ID: not registered."); | ||
| idPool.Enqueue(id); | ||
| } | ||
| } |
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