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FutureBatch.cs
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FutureBatch.cs
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// -----------------------------------------------------------------------
// <copyright file="FutureBatch.cs" company="Asynkron AB">
// Copyright (C) 2015-2024 Asynkron AB All rights reserved
// </copyright>
// -----------------------------------------------------------------------
using System;
using System.Buffers;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Proto.Mailbox;
using Proto.Metrics;
namespace Proto.Future;
/// <summary>
/// Intended for a single batch with a common CancellationToken.
/// </summary>
public sealed class FutureBatchProcess : Process, IDisposable
{
private readonly CancellationTokenRegistration _cancellation;
private readonly TaskCompletionSource<object>?[] _completionSources;
private readonly KeyValuePair<string, object?>[] _metricTags = Array.Empty<KeyValuePair<string, object?>>();
private readonly Action? _onTimeout;
private int _prevIndex = -1;
public FutureBatchProcess(ActorSystem system, int size, CancellationToken ct) : base(system)
{
var name = System.ProcessRegistry.NextId();
var (pid, absent) = System.ProcessRegistry.TryAdd(name, this);
if (!absent)
{
throw new ProcessNameExistException(name, pid);
}
Pid = pid;
_completionSources = ArrayPool<TaskCompletionSource<object>>.Shared.Rent(size);
if (system.Metrics.Enabled)
{
_metricTags = new KeyValuePair<string, object?>[] { new("id", System.Id), new("address", System.Address) };
_onTimeout = () => ActorMetrics.FuturesTimedOutCount.Add(1, _metricTags);
}
else
{
_onTimeout = null;
}
if (ct != default)
{
_cancellation = ct.Register(() =>
{
foreach (var tcs in _completionSources)
{
if (tcs?.TrySetException(
new TimeoutException("Request didn't receive any Response within the expected time.")
) == true)
{
_onTimeout?.Invoke();
}
}
}
);
}
}
public PID Pid { get; }
public void Dispose()
{
_cancellation.Dispose();
ArrayPool<TaskCompletionSource<object>?>.Shared.Return(_completionSources, true);
System.ProcessRegistry.Remove(Pid);
}
public IFuture? TryGetFuture()
{
var index = Interlocked.Increment(ref _prevIndex);
if (index < _completionSources.Length)
{
var tcs = new TaskCompletionSource<object>(TaskCreationOptions.RunContinuationsAsynchronously);
_completionSources[index] = tcs;
if (System.Metrics.Enabled)
{
ActorMetrics.FuturesStartedCount.Add(1, _metricTags);
}
return new SimpleFutureHandle(Pid.WithRequestId(ToRequestId(index)), tcs, _onTimeout);
}
return null;
}
protected internal override void SendUserMessage(PID pid, object message)
{
if (!TryGetTaskCompletionSource(pid.RequestId, out var index, out var tcs))
{
return;
}
try
{
tcs.TrySetResult(message);
_completionSources[index] = default;
}
finally
{
if (System.Metrics.Enabled)
{
ActorMetrics.FuturesCompletedCount.Add(1, _metricTags);
}
}
}
protected internal override void SendSystemMessage(PID pid, SystemMessage message)
{
if (message is Stop)
{
Dispose();
return;
}
if (!TryGetTaskCompletionSource(pid.RequestId, out var index, out var tcs))
{
return;
}
try
{
tcs.TrySetResult(default!);
_completionSources[index] = default;
}
finally
{
if (System.Metrics.Enabled)
{
ActorMetrics.FuturesCompletedCount.Add(1, _metricTags);
}
}
}
private bool TryGetIndex(uint requestId, out int index)
{
index = (int)(requestId - 1);
return index >= 0 && index < _completionSources.Length;
}
private static uint ToRequestId(int index) => (uint)(index + 1);
private bool TryGetTaskCompletionSource(uint requestId, out int index, out TaskCompletionSource<object> tcs)
{
if (!TryGetIndex(requestId, out index))
{
tcs = default!;
return false;
}
tcs = _completionSources[index]!;
return tcs != default!;
}
private sealed class SimpleFutureHandle : IFuture
{
private readonly Action? _onTimeout;
public SimpleFutureHandle(PID pid, TaskCompletionSource<object> tcs, Action? onTimeout)
{
_onTimeout = onTimeout;
Pid = pid;
Tcs = tcs;
}
internal TaskCompletionSource<object> Tcs { get; }
public PID Pid { get; }
public Task<object> Task => Tcs.Task;
public async Task<object> GetTask(CancellationToken cancellationToken)
{
try
{
if (cancellationToken == default)
{
return await Tcs.Task.ConfigureAwait(false);
}
await using (cancellationToken.Register(() => Tcs.TrySetCanceled()).ConfigureAwait(false))
{
return await Tcs.Task.ConfigureAwait(false);
}
}
catch
{
_onTimeout?.Invoke();
throw new TimeoutException("Request didn't receive any Response within the expected time.");
}
}
public void Dispose()
{
}
}
}