public void pastCrowl(){
		DatastoreService datastore = DatastoreServiceFactory
				.getDatastoreService();
		Entity past_string = null;
		try {
			Key key = KeyFactory.createKey("past_string", "onlyOne");
			past_string = datastore.get(key);
		} catch (Throwable t) {
		}
		past_string.setProperty("text",new Text(new Past().getPastString()));
		try{
		if(false)datastore.put(past_string);
		}catch(Throwable t){}
		Queue queue = QueueFactory.getDefaultQueue();
		queue.add(Builder.withUrl("/back").param("op","pastCrowl").method(Method.POST).countdownMillis(60000*30));
		queue.add(Builder.withUrl("/sync").param("mode", "past").method(Method.GET).countdownMillis(30000));
		queue.add(Builder.withUrl("/sync").param("mode", "ranking").method(Method.GET).countdownMillis(45000));
		queue.add(Builder.withUrl("/sync").param("mode", "pair").method(Method.GET).countdownMillis(60000));
		queue.add(Builder.withUrl("/ranking").param("c", "true").method(Method.GET).countdownMillis(90000));
		queue.add(Builder.withUrl("/pair").param("c", "true").method(Method.GET).countdownMillis(120000));
	}