Policy provider comparison

[Peter Firmstone]

Thought I might provide a comparison using our random stress test on a 4 
way sony vaio, JDK7 Windows 7 amd64:

Note that using sun.security.provider.PolicyFile doubles the duration of 
the stress test and it consumes 73% of CPU.

In comparison org.apache.river.api.security.ConcurrentPolicyFile uses 0% 
CPU and the test completes in half the time, with our policy provider we 
run at raw socket speed.

See attached.

Regards,

Peter.
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