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11.2 OTcl Timer classA simple timer class is defined in ~ns/tcl/mcast/timer.tcl. Subclasses of Timer can be defined as needed. Unlike the C++timer API, where a sched() aborts if the timer is already set, sched() and resched() are the same; i.e., no state is kept forthe OTcl timers. The following methods are defined in the Timer base class:$self sched $delay$self resched $delay$self cancel$self destroy$self expire;# causes "$self timeout" to be called $delay seconds in the future;# same as "$self sched $delay";# cancels any pending scheduled callback;# same as "$self cancel";# calls "$self timeout" immediately11.3 Commands at a glanceFollowing is a list of methods for the class Timer. Note that many different types of timers have been derived from this baseclass (viz. LogTimer, Timer/Iface, Timer/Iface/Prune, CacheTimer, Timer/Scuba etc).$timer sched This command cancels any other event that may have been scheduled and re-schedules another event after time .$timer resched Similar to "sched" described above. Added to have similar APIs as that of the C++ timers.$timer cancelThis cancels any scheduled event.$timer destroyThis is similar to cancel. Cancels any scheduled event.$timer expireThis command calls for a time-out. However the time-out procedure needs to be defined in the sub-classes.All these procedures can be found in ns/tcl/mcast/timer.tcl.115