使用Clojure的gem中提供的JRuby类

I am a fairly simple need to use a Ruby class from within Clojure. The complicating factors are that the class is supplied in a gem. The optimal approach would be to setup my Leiningein project file along the lines of:

我很简单地需要在Clojure中使用Ruby类。复杂的因素是该类是在宝石中提供的。最佳方法是按照以下方式设置我的Leiningein项目文件：

(project foo ""
  ...
  :dependencies [[clojure ...]
                 [jruby ...  ]])

Likewise I would prefer to simply check the gem and its dependencies into the local repo directory. Therefore, from my ideal usage would then be:

同样，我更愿意只检查gem及其依赖项到本地repo目录中。因此，从我的理想用法将是：

(ns bar.baz
  (require [jruby.something :as jruby])

(def obj (jruby/CreateAnInstance "TheGemClass"))

(def result (jruby/CallAMethod obj "method_name" some args))

Thanks.

谢谢。

1 个解决方案

#1

Here's a short list of steps to get the hello-world gem running using JRuby and Clojure and a few references. In fact, the steps compose just a short sketch of how the material from the references might come together (with some project.clj entries). The first reference, Haml on Clojure Web App on Yoko Harada's (@yokolet's) blog, uses a slightly different way actually to call into JRuby, but includes the key remark on how to write require("...") lines for use with JRuby and gems on the classpath.

下面是使用JRuby和Clojure以及一些参考资料来运行hello-world gem的简短步骤列表。实际上，这些步骤只是简单描述了引用中的材料如何组合在一起（使用一些project.clj条目）。第一个参考，在Yoko Harada（@ yokolet's）博客上的Clojure Web App上的Haml，使用了一种稍微不同的方式来调用JRuby，但包括关于如何编写require（“...”）行以供使用的关键注释JRuby和类路径上的宝石。

1. Add [org.jruby/jruby-complete "1.6.7.2"] to your :dependencies and have Leiningen fetch the dependencies.

   将[org.jruby / jruby-complete“1.6.7.2”]添加到您的：dependencies并让Leiningen获取依赖项。

2. Create a gems directory in the project root and add it to :resource-paths in your project.clj This requires Leiningen 2. See the Leiningen source for the correct format.

   在项目根目录中创建一个gems目录并将其添加到：project.clj中的resource-paths这需要Leiningen 2.请参阅Leiningen源代码以获取正确的格式。

3. Say

   说

   # see reference 4
   GEM_HOME=gems GEM_PATH=gems java -jar ~/.m2/repository/org/jruby/jruby-complete/1.6.7.2/jruby-complete-1.6.7.2.jar -S gem install hello-world
   

   in the project root.

   在项目根目录中。

4. Start up the REPL service of your choice with GEM_HOME and GEM_PATH set as above. (I tested this with lein2 swank.)

   使用上面设置的GEM_HOME和GEM_PATH启动您选择的REPL服务。 （我用lein2 swank测试了这个。）

5. Say the following at the REPL:

   在REPL中说出以下内容：

   ;;; see reference 2, first snippet
   (let [runtime (JavaEmbedUtils/initialize (list))
         evaler  (JavaEmbedUtils/newRuntimeAdapter)]
     (doseq [ruby-expr ["require('rubygems')"
                        "require('gems/hello-world-1.2.0/lib/hello-world')"]]
       (.eval evaler runtime ruby-expr)))
   

6. Behold the nil return value, as well as a couple of lines printed out to the terminal the REPL service has been started from.

   看看nil返回值，以及打印到REPL服务的终端打印的几行。

References:

参考文献：

1. Haml on Clojure Web App on Yoko Harada's (@yokolet's) blog
2. 在Yoko Harada（@ yokolet's）博客上的Clojure Web App上的Haml
3. JRuby 1.1.6: Gems-in-a-jar on Nick Sieger's blog
4. JRuby 1.1.6：Nick Sieger博客上的Gems-in-a-jar
5. DirectJRubyEmbedding on the JRuby Wiki at Project Kenai
6. 在Kenai项目的JRuby Wiki上的DirectJRubyEmbedding
7. consuming gems from jruby-complete here on SO (note the comments)
8. 在这里消费来自jruby-complete的宝石（请注意评论）