org.apache.dubbo.rpc

接口 Filter

所有已知子接口:

Filter

所有已知实现类:

AccessLogFilter, ActiveLimitFilter, CacheFilter, ClassLoaderFilter, CompatibleFilter, ConsumerContextFilter, ContextFilter, DeprecatedFilter, EchoFilter, ExceptionFilter, ExecuteLimitFilter, FutureFilter, GenericFilter, GenericImplFilter, ListenableFilter, MetricsFilter, MonitorFilter, TimeoutFilter, TokenFilter, TpsLimitFilter, TraceFilter, ValidationFilter

@SPI
public interface Filter

Extension for intercepting the invocation for both service provider and consumer, furthermore, most of functions in dubbo are implemented base on the same mechanism. Since every time when remote method is invoked, the filter extensions will be executed too, the corresponding penalty should be considered before more filters are added.

  They way filter work from sequence point of view is
    
    ...code before filter ...
          invoker.invoke(invocation) //filter work in a filter implementation class
          ...code after filter ...
    
    Caching is implemented in dubbo using filter approach. If cache is configured for invocation then before
    remote call configured caching type's (e.g. Thread Local, JCache etc) implementation invoke method gets called.
 

Filter. (SPI, Singleton, ThreadSafe)

另请参阅:

GenericFilter, EchoFilter, TokenFilter, TpsLimitFilter

嵌套类概要

嵌套类

限定符和类型	接口和说明
static interface	Filter.Listener

方法概要

限定符和类型	方法和说明
Result	invoke(Invoker<?> invoker, Invocation invocation) Does not need to override/implement this method.
default Result	onResponse(Result appResponse, Invoker<?> invoker, Invocation invocation) 已过时。

方法详细资料

invoke

Result invoke(Invoker<?> invoker,
              Invocation invocation)
       throws RpcException

Does not need to override/implement this method.

抛出:

RpcException

onResponse

@Deprecated
default Result onResponse(Result appResponse,
                                      Invoker<?> invoker,
                                      Invocation invocation)

已过时。

Filter itself should only be response for passing invocation, all callbacks has been placed into Filter.Listener

参数:

appResponse -

invoker -

invocation -

返回: