sPFFramework/src/main/java/it/polimi/spf/framework/search/SearchScheduler.java
private String generateQueryId(QueryInfo queryInfo) {
		String queryId = SPF.get().getUniqueIdentifier() + (++id);
		queryInfo.setQueryId(queryId);
		return queryId;
	}
private String generateQueryId(QueryInfo queryInfo) {
		String queryId = SPF.get().getUniqueIdentifier() + (++id);
		queryInfo.setQueryId(queryId);
		return queryId;
	}
Generate a query id for the specified query. The query id is assigned to
the query descriptor.

@param queryInfo
@return the query id