Returns the number of instances corresponding to the given
<code>key</code> currently idle in this pool. Returns a negative value if
this information is not available.
@param key the key to query
@return the number of instances corresponding to the given
<code>key</code> currently idle in this pool.
Returns the number of instances corresponding to the given <code>key</code> currently idle in this pool. Returns a negative value if this information is not available.
@param key the key to query @return the number of instances corresponding to the given <code>key</code> currently idle in this pool.