A connector can spend a large amount of time in the pool before being used. This method is intended to check if the connector is alive and operations can be invoked on it (for instance, an implementation would check that the connector's physical connection to the resource has not timed out).
The major difference between this method and
TestOp.test() is that
this method must do only the minimum that is necessary to check that the
connector is still alive.
TestOp.test() does a more thorough
check of the environment specified in the Configuration, and can therefore
be much slower.
This method can be called often. Implementations should do their best to keep this method fast.
RuntimeException- if the connector is no longer alive.
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