从Java调用clojure（Clojure Interop） [英] calling clojure from Java (Clojure Interop)

问题描述

从Clojoure调用Java非常简单明了，但事实证明反向是不可预测的。

Calling Java from Clojoure is quite simple and straightforward but the inverse has proven to be unpredictable.

他们似乎有两种方式：

1）以下课程

1)the following classes

      i) import clojure.java.api.Clojure; ,
     ii) import clojure.lang.IFn;

2）将你的clojure编译成uberjar，然后将其导入java
代码。 / p>

2)compile your clojure into an uberjar then import it into the java code.

我选择了第二个选项，因为它更直接。

I have opted for the 2nd option as it's more straight forward.

这是clojure代码

Here is the clojure code

(ns com.test.app.service
 (:gen-class
       :name com.test.app.service
       :main false
       :methods [^{:static true} [returned [int] int]]))

    (defn returned
      [number]
      (* 2 number))

    (defn -returned
      [number]
      (returned number))

这是Java代码。

package com.s.profile;

import java.util.*;
import com.microsoft.azure.serverless.functions.annotation.*;
import com.microsoft.azure.serverless.functions.*;
import com.test.app.service;


/**
 * Azure Functions with HTTP Trigger.
 */
public class Function {
    /**
     * This function listens at endpoint "/api/hello". Two ways to invoke it using "curl" command in bash:
     * 1. curl -d "HTTP Body" {your host}/api/hello
     * 2. curl {your host}/api/hello?name=HTTP%20Query
     */
    @FunctionName("hello")
    public HttpResponseMessage<String> hello(
            @HttpTrigger(name = "req", methods = {"get", "post"}, authLevel = AuthorizationLevel.ANONYMOUS) HttpRequestMessage<Optional<String>> request,
            final ExecutionContext context) {
        context.getLogger().info("Java HTTP trigger processed a request.");

        // Parse query parameter
        String query = request.getQueryParameters().get("name");
        String name = request.getBody().orElse(query);

        if (name == null) {
            return request.createResponse(400, "Please pass a name on the query string or in the request body");
        } else {
            service.returned(4);
            context.getLogger().info("process data" );
            return request.createResponse(200, "Hellos, " + name );
        }
    }
}

我什么时候做 service.returned（4）;系统永远不会回来。我无法弄清楚为什么对我来说它的功能不会从Clojure返回，但我看不出原因。

When ever I make the "service.returned(4);" the system never returns. I can't quite figure out why to me it comes off like the function doesn't return from Clojure but I can't see the cause.

只是为了添加一些上下文我已经尝试过它的一个简单的hello world java app，它打印出结果并且它可以工作。当我尝试在Azure功能中实现它时。

Just to add some context I have tried it when its a simple hello world java app which just prints out the result and it works. It's when I try implement it in the Azure functions.

推荐答案

我跟着这些指令，它似乎解决了找不到类的错误。似乎在运行命令时

I followed these instructions and it seemed to resolve the error of class not found. It seems as though when running the command

mvn azure-functions:run

它不会自动查找所有导入的库。您必须使用

It doesn't automatically find all imported libraries. You either have to use

1. maven-assembly-plugin


2. maven-shade-plugin

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