Reports that an asynchronous computation failed.
Reports that an asynchronous computation failed.
Returns string formatted according to given format
string.
Returns string formatted according to given format
string.
Format strings are as for String.format
(@see java.lang.String.format).
Prepares for the execution of a task.
Prepares for the execution of a task. Returns the prepared
execution context. A valid implementation of prepare
is one
that simply returns this
.
Union interface since Java does not support union types