public
final
class
RpcUtil
Grab-bag of utility functions useful when dealing with RPCs.
Static Methods
<ParameterType>newOneTimeCallback(RpcCallback<ParameterType> originalCallback)
public
static
RpcCallback<ParameterType>
< ParameterType>newOneTimeCallback
(
RpcCallback<ParameterType>
originalCallback
)
Creates a callback which can only be called once. This may be useful for security, when passing a callback to untrusted code: most callbacks do not expect to be called more than once, so doing so may expose bugs if it is not prevented.
<Type>generalizeCallback(RpcCallback<Type> originalCallback, Class<Type> originalClass, Type defaultInstance)
public
static
RpcCallback<Message>
< Type>generalizeCallback
(
RpcCallback<Type>
originalCallback
,
Class<Type>
originalClass
,
Type
defaultInstance
)
Take an RpcCallback
accepting a specific message type and convert it to an RpcCallback<Message>
. The generalized callback will accept any message object which has the
same descriptor, and will convert it to the correct class before calling the original callback.
However, if the generalized callback is given a message with a different descriptor, an
exception will be thrown.
originalCallback
RpcCallback
< Type
>
originalClass
Class
< Type
>
defaultInstance
Type
<Type>specializeCallback(RpcCallback<Message> originalCallback)
public
static
RpcCallback<Type>
< Type>specializeCallback
(
RpcCallback<Message>
originalCallback
)
Take an RpcCallback<Message>
and convert it to an RpcCallback
accepting a
specific message type. This is always type-safe (parameter type contravariance).
