A simple clock interface that gives you time.
A simple liveliness monitor with which clients can register, trust the component to monitor liveliness, get a call-back on expiry and then finally unregister.
This class contains a set of utilities which help converting data structures from/to 'serializableFormat' to/from hadoop/nativejava data structures.
A monotonic clock from some arbitrary time base in the past, counting in milliseconds, and not affected by settimeofday or similar system clock changes.
Interface class to obtain process resource usage NOTE: This class should not be used by external users, but only by external developers to extend and include their own process-tree implementation, especially for platforms other than Linux and Windows.
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