我想在Jess做类似的事情:
(bind ?instance (this))
我使用它的唯一方法是使用" new Object"而不是"这"。
我怎样才能让它发挥作用?
答案 0 :(得分:1)
实际上,有三种方法可以从Jess环境访问Pojo,第四种方法可以访问单个。
public class Main {
public static Main theInstance;
public static Main getInstance(){ return theInstance; }
private String user = "Joe";
public String getUser(){ return user; }
public static void main( String[] args ) throws Exception {
Main main = new Main();
Main.theInstance = main;
Rete rete = new Rete();
// as a global
Defglobal glob = new Defglobal( "*main*", new Value( main ) );
glob.reset( rete );
// as a store member
rete.store( "main", main );
// as a fact
rete.add( main );
// execute demo clp
rete.batch( "two.clp" );
}
}
.clp是:
(printout t "?*main* = " ?*main* crlf)
(printout t "?*main*.user = " (?*main* getUser) crlf)
(printout t "main = " (fetch main) crlf)
(printout t "main.user = " ((fetch main) getUser) crlf)
(defrule get-main-user
(Main (user ?user))
=>
(printout t "a Main(slot user) = " ?user crlf)
)
(run)
(printout t "Main.theInstance = " ((call Main getInstance) getUser) crlf)
输出:
?*main* = <Java-Object:Main>
?*main*.user = Joe
main = <Java-Object:Main>
main.user = Joe
a Main(slot user) = Joe
Main.theInstance = Joe
答案 1 :(得分:0)
据推测,您正在将一些Jess代码传递给Rete.exec()方法,并希望引用正在进行调用的对象。你只需要自己注入Jess。使用Rete.store()将对象存储在Jess中,然后使用(fetch)从Jess代码中的存储中检索它,或者使用全局上下文对象的方法 - 请参阅Rete.getGlobalContext() - 来设置一个引用Java对象的变量,然后在Jess代码中使用该变量。