InvocationHandler class abstract interface

The object that does the work of an interface proxy: every call of the generated implementation ends up in invoke.

A library implements it for its kind of interface (for Feign, turning the call into an HTTP request) and creates it in an InvocationHandlerFactory. Applications do not implement it.

// A handler that only logs the calls.
final class LoggingHandler implements InvocationHandler {
  @override
  Object? invoke(ProxyMethod method, List<Object?> arguments) {
    log.info('${method.name}($arguments)');
    return null;
  }
}

Spring (Java):

InvocationHandler handler = (proxy, method, args) -> { ... };

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

invoke(ProxyMethod method, List<Object?> arguments) → Object?

Handles a call of method with arguments and returns its result: a Future of the value for methods that return one (ProxyMethod.isFuture). What it throws reaches the caller.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited