synchronized void close() {
if (--refCount == 0) {
if (provider != null) {
vertx.executeBlocking(
future -> {
try {
provider.close(ds);
future.complete();
} catch (SQLException e) {
future.fail(e);
}
},
null);
}
if (exec != null) {
exec.shutdown();
}
if (closeRunner != null) {
closeRunner.run();
}
}
}
