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本篇文章旨在描述如何在 在本示例中 ，我们主要是基于 一、发布端事务由于大部分人都是在 1、创建一个
public class CapTransactionFilterAttribute : TypeFilterAttribute
{
public CapTransactionFilterAttribute() : base(typeof(TransactionActionFilter))
{
}
public class TransactionActionFilter : IActionFilter
{
private IDbContextTransaction _transaction;
public void OnActionExecuting(ActionExecutingContext context)
{
var dbContext = context.HttpContext.RequestServices.GetRequiredService<AppDbContext>();
var capPublisher = context.HttpContext.RequestServices.GetService<ICapPublisher>();
_transaction = dbContext.Database.BeginTransaction(capPublisher);
}
public void OnActionExecuted(ActionExecutedContext context)
{
if (context.Exception == null)
{
_transaction.Commit();
}
else
{
_transaction.Rollback();
}
_transaction?.Dispose();
}
}
}
2、使用方式，在需要进行事务控制的
[Route("~/ef/trans-filter")]
[TypeFilter(typeof(CapTransactionFilterAttribute))]
public IActionResult EntityFrameworkWithTransactionFilter(
[FromServices] AppDbContext dbContext)
{
dbContext.Persons.Add(new Person() { Name = "ef.transaction" });
_capBus.Publish("sample.rabbitmq.mysql", DateTime.Now);
dbContext.SaveChanges();
return Ok();
}
二、消费端事务消费端自动事务主要利用 1、创建一个 CAP 过滤器
public class MyCapFilter : SubscribeFilter
{
private readonly AppDbContext _dbContext;
private IDbContextTransaction _transaction;
public MyCapFilter(AppDbContext dbContext)
{
_dbContext = dbContext;
}
public override void OnSubscribeExecuting(ExecutingContext context)
{
_transaction = _dbContext.Database.BeginTransaction();
}
public override void OnSubscribeExecuted(ExecutedContext context)
{
_transaction.Commit();
}
public override void OnSubscribeException(DotNetCore.CAP.Filter.ExceptionContext context)
{
_transaction.Rollback();
}
}
2、配置过滤器
services.AddCap(opt =>
{
// ***
}.AddSubscribeFilter<MyCapFilter>();
以上就是消费端的一个简单示例。 到此这篇关于在 |
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