Package kos.core.exception

Class PredicateExceptionHandler

java.lang.Object

kos.core.exception.PredicateExceptionHandler

All Implemented Interfaces:

ExceptionHandler

public class PredicateExceptionHandler
extends Object
implements ExceptionHandler

The default Exception Handler mechanism. It provides predicate-based semantics for Exception Handler matching.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	PredicateExceptionHandler.PredicateAndHandler

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final @NonNull List<PredicateExceptionHandler.PredicateAndHandler>	predicatesAndHandlers	This is a naive implementation, which the performance degrades linearly as the number of predicates grows.

Constructor Summary

Constructors

Constructor	Description
PredicateExceptionHandler()	Constructs this class with an empty, but mutable, list of predicates.

Method Summary

Modifier and Type	Method	Description
void	add(Predicate<Throwable> predicate, ExceptionHandler handler)
Response	handle(io.vertx.core.http.HttpServerRequest request, Throwable cause)	Handles exceptions by returning a Response object that will be send as http response to the client.
private Response	handleUnknownError(io.vertx.core.http.HttpServerRequest request, Throwable cause)

Methods inherited from class java.lang.Object

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

Field Details

predicatesAndHandlers

@NonNull
final @NonNull List<PredicateExceptionHandler.PredicateAndHandler> predicatesAndHandlers

This is a naive implementation, which the performance degrades linearly as the number of predicates grows. It might not be a problem as exceptions shouldn't be the preferred request path, thus not impacting the user experience that much.

Constructor Details

PredicateExceptionHandler

public PredicateExceptionHandler()

Constructs this class with an empty, but mutable, list of predicates.

Method Details

add

public void add(Predicate<Throwable> predicate,
 ExceptionHandler handler)

handle

public Response handle(io.vertx.core.http.HttpServerRequest request,
 Throwable cause)

Description copied from interface: ExceptionHandler

Handles exceptions by returning a Response object that will be send as http response to the client.

Specified by:

handle in interface ExceptionHandler

Parameters:

request - current request context

cause - error cause

Returns:

object that will be send as http response to the client

See Also:

• ExceptionHandler.handle(HttpServerRequest, Throwable)

handleUnknownError

private Response handleUnknownError(io.vertx.core.http.HttpServerRequest request,
 Throwable cause)