net.devh.boot.grpc.server.advice

Class GrpcAdviceExceptionHandler

java.lang.Object

net.devh.boot.grpc.server.advice.GrpcAdviceExceptionHandler

All Implemented Interfaces:

GrpcExceptionResponseHandler

public class GrpcAdviceExceptionHandler
extends Object
implements GrpcExceptionResponseHandler

As part of @GrpcAdvice, when a thrown exception is caught during gRPC calls (via global interceptor GrpcExceptionInterceptor), then this thrown exception is being handled. The GrpcExceptionHandlerMethodResolver provides a mapping for exceptions and their respective handler methods.

The response is derived from methods annotated with GrpcExceptionHandler inside GrpcAdvice beans.

See Also:

GrpcAdvice, GrpcExceptionHandler, GrpcExceptionHandlerMethodResolver, GrpcExceptionInterceptor

Constructor Summary

Constructors

Constructor and Description
GrpcAdviceExceptionHandler(GrpcExceptionHandlerMethodResolver grpcExceptionHandlerMethodResolver) Creates a new GrpcAdvice powered GrpcExceptionHandler.

Method Summary

Modifier and Type	Method and Description
void	handleError(ServerCall<?,?> serverCall, Throwable error) Handles an exception by closing the call with an appropriate Status.
protected Object	handleThrownException(Throwable exception) Given an exception, a lookup is performed to retrieve mapped method.
protected void	handleThrownExceptionByImplementation(ServerCall<?,?> serverCall, Throwable throwable)
protected Metadata	resolveMetadata(Object mappedReturnType)
protected Status	resolveStatus(Object mappedReturnType)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GrpcAdviceExceptionHandler

public GrpcAdviceExceptionHandler(GrpcExceptionHandlerMethodResolver grpcExceptionHandlerMethodResolver)

Creates a new GrpcAdvice powered GrpcExceptionHandler.

Parameters:

grpcExceptionHandlerMethodResolver - The method resolver to use.

Method Detail

handleError

public void handleError(ServerCall<?,?> serverCall,
                        Throwable error)

Description copied from interface: GrpcExceptionResponseHandler

Handles an exception by closing the call with an appropriate Status.

Specified by:

handleError in interface GrpcExceptionResponseHandler

Parameters:

serverCall - The server call used to send the response status.

error - The error to handle.

resolveStatus

protected Status resolveStatus(Object mappedReturnType)

resolveMetadata

protected Metadata resolveMetadata(Object mappedReturnType)

handleThrownExceptionByImplementation

protected void handleThrownExceptionByImplementation(ServerCall<?,?> serverCall,
                                                     Throwable throwable)

handleThrownException

@Nullable
protected Object handleThrownException(Throwable exception)
                                          throws Throwable

Given an exception, a lookup is performed to retrieve mapped method.
In case of successful returned method, and matching exception parameter type for given exception, the exception is handed over to retrieved method. Retrieved method is then being invoked.

Parameters:

exception - exception to search for

Returns:

result of invoked mapped method to given exception

Throws:

Throwable - rethrows exception if no mapping existent or exceptions raised by implementation