ReliableMessageTransactionWorker.cs
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using Microsoft.Extensions.Logging;
using Pole.Domain.UnitOfWork;
using Pole.ReliableMessage.Abstraction;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace Pole.Application.EventBus
{
public class ReliableMessageTransactionWorker : IWorker
{
private readonly IReliableMessageScopedBuffer _reliableMessageScopedBuffer;
private readonly IReliableBus _reliableBus;
private readonly ILogger<ReliableMessageTransactionWorker> _logger;
public ReliableMessageTransactionWorker(IReliableMessageScopedBuffer reliableMessageScopedBuffer, IReliableBus reliableBus, ILogger<ReliableMessageTransactionWorker> logger)
{
_reliableMessageScopedBuffer = reliableMessageScopedBuffer;
_reliableBus = reliableBus;
_logger = logger;
}
public int Order => 200;
public WorkerStatus WorkerStatus { get; set; }
public async Task Commit(CancellationToken cancellationToken = default)
{
var events = _reliableMessageScopedBuffer.GetAll();
try
{
var tasks = events.Select(async @event =>
{
await _reliableBus.Publish(@event.Event, @event.PrePublishEventId, cancellationToken);
});
await Task.WhenAll(tasks);
}
catch (Exception ex)
{
_logger.LogError(ex, "ReliableMessageTransactionWorker.Commit error");
// 此时 预发送成功 ,数据库事务提交成功 ,发送消息至消息队列失败 ,任然返回成功 ,因为预发送消息 的重试机制会让 消息发送成功
}
WorkerStatus = WorkerStatus.Commited;
return;
}
public void Dispose()
{
}
public async Task PreCommit(CancellationToken cancellationToken = default)
{
var events = _reliableMessageScopedBuffer.GetAll();
foreach (var @event in events)
{
@event.PrePublishEventId = await _reliableBus.PrePublish(@event.Event, @event.EventType, @event.CallbackParemeter, cancellationToken);
}
WorkerStatus = WorkerStatus.PreCommited;
}
public Task Rollback(CancellationToken cancellationToken = default)
{
var events = _reliableMessageScopedBuffer.GetAll();
events.Where(m => !string.IsNullOrEmpty(m.PrePublishEventId)).ToList().ForEach(async @event =>
{
await _reliableBus.Cancel(@event.PrePublishEventId, cancellationToken);
});
WorkerStatus = WorkerStatus.Rollbacked;
return Task.FromResult(1);
}
}
}