/** Allocates a connection from the idle pool. */
private UserPoolItem allocateIdleConnection(
ManagedConnectionFactory mcf,
Subject subject,
ConnectionRequestInfo info,
UserPoolItem oldPoolItem)
throws ResourceException {
while (_lifecycle.isActive()) {
ManagedConnection mConn;
long now = CurrentTime.getCurrentTime();
if (_lastValidCheckTime + 15000L < now) {
_lastValidCheckTime = now;
if (mcf instanceof ValidatingManagedConnectionFactory) {
ValidatingManagedConnectionFactory vmcf;
vmcf = (ValidatingManagedConnectionFactory) mcf;
validate(vmcf);
}
}
ManagedPoolItem poolItem = null;
while (true) {
// asks the Driver's ManagedConnectionFactory to match an
// idle connection
synchronized (_connectionPool) {
mConn = mcf.matchManagedConnections(_idlePool, subject, info);
// If there are no more idle connections, return null
if (mConn == null) return null;
// remove can fail for threading reasons, so only succeed if it works.
if (!_idlePool.remove(mConn)) {
mConn = null;
}
}
if (mConn != null) {
poolItem = findPoolItem(mConn);
if (poolItem == null)
throw new IllegalStateException(
L.l("Unexpected non-matching PoolItem found for {0}", mConn));
break;
}
}
try {
// Ensure the connection is still valid
UserPoolItem userPoolItem;
userPoolItem = poolItem.toActive(subject, info, oldPoolItem);
if (userPoolItem != null) {
poolItem = null;
return userPoolItem;
}
} finally {
if (poolItem != null) poolItem.destroy();
}
}
return null;
}
