Java interface to represent an aspect that triggers actions before and after an action.
Extension of JCU CountDownLatch to allow for increments (so as to support finish).
A utility class that represent a 2-tuple of values, usually used by methods which want to return multiple values.
A ValueWrapper represents a value of type ValueType.
AbortedException is thrown by a task to notify the runtime that this task needs to be immediately aborted.
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