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Class magician.Node.Scheduler 

java.lang.Object
   |
   +----magician.Node.Scheduler
public class Scheduler
extends Object
implements PerfConstants
Class Scheduler ensures that only a fixed number of threads are running at a certain interval. If the maximum number of threads is reached, the new thread is put in the queue and is scheduled to run when possible. The priority of a thread is lowered periodically to give a new thread a chance to run.

Variable Index

o EventMgr
Event manager to log events
o maxThreads
maximum number of SmartPacket threads that can run concurrently
o QTime
table to maintain queueng times
o readyQueue
the queue of ready Smartpacket threads
o runningThreads
list of running SmartPacket threads
o ticker
the clock thread

Constructor Index

o Scheduler(int)
initializes the scheduler with the maximum number of runnable threads

Method Index

o invoke()
invokes the Schduler to remove the calling Smartpacket thread
o Schedule(SPThread)
Schedules the Smartpacket thread for execution
o tick()
checks on active threads and performs thread maintenance

Variables

o maxThreads 
 protected int maxThreads
maximum number of SmartPacket threads that can run concurrently

o readyQueue 
 protected SchedQueue readyQueue
the queue of ready Smartpacket threads

o runningThreads 
 protected UnsynchVector runningThreads
list of running SmartPacket threads

o EventMgr 
 EventManager EventMgr
Event manager to log events

o QTime 
 protected Hashtable QTime
table to maintain queueng times

o ticker 
 static Thread ticker
the clock thread

Constructors

o Scheduler 
 public Scheduler(int maxThreads)
initializes the scheduler with the maximum number of runnable threads

Parameters:
maxThreads - number of threads

Methods

o tick 
 public void tick()
checks on active threads and performs thread maintenance

o invoke 
 protected static void invoke()
invokes the Schduler to remove the calling Smartpacket thread

o Schedule 
 public void Schedule(SPThread t)
Schedules the Smartpacket thread for execution

Parameters:
t - the Smartpacket thread 
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