@Override
public void execute(RouteResultset rrs, int type) {
if (LOGGER.isDebugEnabled()) {
StringBuilder s = new StringBuilder();
LOGGER.debug(s.append(source).append(rrs).toString());
}
// 检查路由结果是否为空
RouteResultsetNode[] nodes = rrs.getNodes();
if (nodes == null || nodes.length == 0) {
source.writeErrMessage(ErrorCode.ER_NO_DB_ERROR, "No dataNode selected");
return;
}
// 选择执行方式
if (nodes.length == 1) {
singleNodeExecutor.execute(nodes[0], this, rrs.getFlag());
} else {
// 多数据节点，非事务模式下，执行的是可修改数据的SQL，则后端为事务模式。
boolean autocommit = source.isAutocommit();
if (autocommit && isModifySQL(type)) {
autocommit = false;
}
// multiNodeExecutor.execute(nodes, autocommit, this, rrs.getFlag());
}
}
@Override
public void cancel(FrontendConnection sponsor) {
// TODO terminate session
source.writeErrMessage(ErrorCode.ER_QUERY_INTERRUPTED, "Query execution was interrupted");
if (sponsor != null) {
OkPacket packet = new OkPacket();
packet.packetId = 1;
packet.affectedRows = 0;
packet.serverStatus = 2;
packet.write(sponsor);
}
}