This example uses the `AutoMap` attribute of the AutoMapper to configure the mapping. You could create a profile class instead. Please refer to the AutoMapper document for more options.
## Exception Handling
ABP provides exception handling and retries when an exception occurs, it will move to the dead letter queue after the retry fails.
Enable exception handling:
```csharp
public override void PreConfigureServices(ServiceConfigurationContext context)
{
PreConfigure<AbpEventBusOptions>(options =>
{
options.EnabledErrorHandle = true;
options.UseRetryStrategy();
});
}
```
* `EnabledErrorHandle` is used to enable exception handing.
* `UseRetryStrategy` is used to enable retry.
When an exception occurs, it will retry every three seconds up to the maximum number of retries(default is 3) and move to dead letter queue, you can change the number of retries, retry interval and dead letter queue name:
```csharp
PreConfigure<AbpEventBusOptions>(options =>
{
options.DeadLetterName = "dead_queue";
options.UseRetryStrategy(retryStrategyOptions =>
{
retryStrategyOptions.IntervalMillisecond = 0;
retryStrategyOptions.MaxRetryAttempts = 1;
});
});
```
### Error Handle Selector
By default all event types will be exception handling, you can use `ErrorHandleSelector` of `AbpEventBusOptions` to change it:
```csharp
PreConfigure<AbpEventBusOptions>(options =>
{
options.ErrorHandleSelector = type => type == typeof(MyExceptionHandleEventData);
});
```
`options.ErrorHandleSelector` actually a list of type predicate. You can write a lambda expression to define your filter.
### Customize Exception Handling
ABP defines the `IEventErrorHandler` interface and implemented by the provider, you can replace it via [dependency injection](Dependency-Injection.md)
This example uses the `AutoMap` attribute of the AutoMapper to configure the mapping. You could create a profile class instead. Please refer to the AutoMapper document for more options.
@ -158,52 +158,6 @@ If you perform **database operations** and use the [repositories](Repositories.m
> The handler class must be registered to the dependency injection (DI). The sample above uses the `ITransientDependency` to accomplish it. See the [DI document](Dependency-Injection.md) for more options.
## Exception Handling
ABP provides exception handling and retries when an exception occurs.
Enable exception handling:
```csharp
public override void PreConfigureServices(ServiceConfigurationContext context)
{
PreConfigure<AbpEventBusOptions>(options =>
{
options.UseRetryStrategy();
});
}
```
When an exception occurs, it will retry every three seconds up to the maximum number of retries(default is 3) and throw the original exception, you can change the number of retries and the retry interval:
```csharp
PreConfigure<AbpEventBusOptions>(options =>
{
options.UseRetryStrategy(retryStrategyOptions =>
{
retryStrategyOptions.IntervalMillisecond = 0;
retryStrategyOptions.MaxRetryAttempts = 1;
});
});
```
### Error Handle Selector
By default all event types will be exception handling, you can use `ErrorHandleSelector` of `AbpEventBusOptions` to change it:
```csharp
PreConfigure<AbpEventBusOptions>(options =>
{
options.ErrorHandleSelector = type => type == typeof(MyExceptionHandleEventData);
});
```
`options.ErrorHandleSelector` actually a list of type predicate. You can write a lambda expression to define your filter.
### Customize Exception Handling
ABP defines the `IEventErrorHandler` interface and implemented by `LocalEventErrorHandler`, you can replace it via [dependency injection](Dependency-Injection.md)
### Transaction & Exception Behavior
When an event published, subscribed event handlers are immediately executed. So;
liangshiwei
4 years ago