nodejs 处理并发

1. var EventProxy = require('eventproxy');

2. var proxy = new EventProxy();

3. var status = "ready";

4. var select = function(callback){

5. proxy.once("selected",callback);

6. if(status == "ready"){

7. status = "pending";

8. db.select("SQL", function(results){

9. proxy.emit("selected",results);

10. status = "ready";

11. });

12. }

13. }