Java 如何在Clojure中实现具有具体类型参数的接口?
我正在尝试使用Clojure的AWS Lambda。这是有效的Java代码:Java 如何在Clojure中实现具有具体类型参数的接口?,java,amazon-web-services,clojure,Java,Amazon Web Services,Clojure,我正在尝试使用Clojure的AWS Lambda。这是有效的Java代码: import com.amazonaws.services.lambda.runtime.Context; import com.amazonaws.services.lambda.runtime.RequestHandler; public class Dbmgmt implements RequestHandler<Object, Object> { @Override public
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.RequestHandler;
public class Dbmgmt implements RequestHandler<Object, Object> {
@Override
public String handleRequest(Object in, Context ctx) {
System.out.println("ok");
ctx.getLogger().log("ok");
return "ok";
}
}
在两个类上使用Javap:
爪哇:
我想知道实现具有具体返回类型的接口的最佳方法是什么。根据现行规范,AWS投诉:
"errorMessage": "Class dbmgmt does not implement RequestHandler with concrete type parameters"
似乎没有使用返回类
字符串实现handleRequest
方法,只有对象
。您可以将其作为方法名称的“类型提示”:
(reify RequestHandler
(^String handleRequest [this ^Object in ^Context ctx] "ok")))
(编辑:还原编辑,但添加完整的类型提示,这似乎是必需的。)我能解决的最接近的问题是:
(ns dbmgmt
(:gen-class
:implements [com.amazonaws.services.lambda.runtime.RequestHandler]
:methods [[handleRequest [Object com.amazonaws.services.lambda.runtime.Context] String]]))
这将生成以下类:
public class dbmgmt implements com.amazonaws.services.lambda.runtime.RequestHandler {
public static {};
public dbmgmt();
public boolean equals(java.lang.Object);
public java.lang.String toString();
public int hashCode();
public java.lang.Object clone();
public java.lang.Object handleRequest(java.lang.Object, com.amazonaws.services.lambda.runtime.Context);
public java.lang.String handleRequest(java.lang.Object, com.amazonaws.services.lambda.runtime.Context);
public static void main(java.lang.String[]);
}
但是,它仍然没有Java版本所具有的RequestHandler。我相信目前为止,完全在Clojure中实现这一点是不可能的。是的,我也在考虑同样的问题,不幸的是,它没有起作用。
(reify RequestHandler
(^String handleRequest [this ^Object in ^Context ctx] "ok")))
(ns dbmgmt
(:gen-class
:implements [com.amazonaws.services.lambda.runtime.RequestHandler]
:methods [[handleRequest [Object com.amazonaws.services.lambda.runtime.Context] String]]))
public class dbmgmt implements com.amazonaws.services.lambda.runtime.RequestHandler {
public static {};
public dbmgmt();
public boolean equals(java.lang.Object);
public java.lang.String toString();
public int hashCode();
public java.lang.Object clone();
public java.lang.Object handleRequest(java.lang.Object, com.amazonaws.services.lambda.runtime.Context);
public java.lang.String handleRequest(java.lang.Object, com.amazonaws.services.lambda.runtime.Context);
public static void main(java.lang.String[]);
}