I am in quest of a less trivial example of java / clojure interop [closed]

开发者_开发技巧 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 12 years ago.

Does anybody want to answer my question linked here how-to-pass-a-typed-collection-from-clojure-to-java , by providing a clear example, for the rest of us who are trying to sneak clojure in their existing java stack?

---

Just pass a raw(untyped) collections. You don't really need to care about the types - they are just a compiler trick and are discarded at runtime.

---

From Chas Emerick's answer to my original question, I have setup this small maven project:

interop ---- domainobjects ---- IFoo.java
                           ---- TypedObject.java
                           ---- pom.xml

        ---- functional    ---- fooimpl.clj
                           ---- pom.xml

        ---- consumer      ---- JavaConsumer.java
                           ---- JavaConsumerTest.groovy
                           ---- pom.xml
        ---- pom.xml

######################################################################################

package com.tobeconsumed.byjava;

import java.util.List;

public interface IFoo {
    List<TypedObject> createListOfTypedObjects(String message);
}


package com.tobeconsumed.byjava;

public class TypedObject {

    private String property;

    public String getProperty() {
        return property;
    }

    public void setProperty(String property) {
        this.property = property;
    }
}

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <artifactId>interop</artifactId>
    <groupId>interop</groupId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <groupId>interop</groupId>
  <artifactId>domainobjects</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>domainobjects</name>
  <description>Contains all of the domain objects.</description>

  <dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.8.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.codehaus.groovy</groupId>
      <artifactId>groovy-all</artifactId>
      <version>1.7.4</version>
    </dependency>    
  </dependencies>

  <build>

    <finalName>domainobjects</finalName>

    <plugins>
        <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>2.3.1</version>
        <configuration>
          <source>1.6</source>
          <target>1.6</target>
          <project>
            <build>
                <scriptSourceDirectory>src/main/java</scriptSourceDirectory>
                <testSourceDirectory>src/test/java</testSourceDirectory>
            </build>
          </project>
        </configuration>
        <executions>
         <execution>
           <id>compile</id>
           <phase>compile</phase>
           <goals>
             <goal>compile</goal>
           </goals>
         </execution>
         <execution>
           <id>test-java</id>
           <phase>test</phase>
           <goals>
             <goal>testCompile</goal>
           </goals>
         </execution>
       </executions>
      </plugin>
      <plugin>
        <groupId>org.codehaus.gmaven</groupId>
        <artifactId>gmaven-plugin</artifactId>
        <version>1.2</version>
        <extensions>true</extensions>
        <configuration>
            <project>
            <build>
                <sourceDirectory>src/main/groovy</sourceDirectory>
                <testSourceDirectory>src/test/groovy</testSourceDirectory>
            </build>
            </project>
        </configuration>
      </plugin>
      <plugin>
    <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-antrun-plugin</artifactId>
            <executions>
                <execution>
                    <id>compile</id>
                    <phase>compile</phase>
                    <configuration>
                        <tasks>
                            <mkdir dir="${basedir}/src/main/groovy"/>
                            <taskdef name="groovyc"
                                classname="org.codehaus.groovy.ant.Groovyc">
                                <classpath refid="maven.compile.classpath"/>
                            </taskdef>
                            <mkdir dir="${project.build.outputDirectory}"/>
                            <groovyc destdir="${project.build.outputDirectory}"
                                srcdir="${basedir}/src/main/groovy/" listfiles="true">
                                <classpath refid="maven.compile.classpath"/>
                            </groovyc>
                        </tasks>
                    </configuration>
                    <goals>
                        <goal>run</goal>
                    </goals>
                </execution>
                <execution>
                    <id>test-compile</id>
                    <phase>test-compile</phase>
                    <configuration>
                        <tasks>
                            <mkdir dir="${basedir}/src/test/groovy"/>
                            <taskdef name="groovyc"
                                classname="org.codehaus.groovy.ant.Groovyc">
                                <classpath refid="maven.compile.classpath"/>
                            </taskdef>
                            <mkdir dir="${project.build.testOutputDirectory}"/>
                            <groovyc destdir="${project.build.testOutputDirectory}"
                                srcdir="${basedir}/src/test/groovy/" listfiles="true">
                                <classpath refid="maven.test.classpath"/>
                            </groovyc>
                        </tasks>
                    </configuration>
                    <goals>
                        <goal>run</goal>
                    </goals>
                </execution>
            </executions>
       </plugin>      
    </plugins>
  </build>

</project>


######################################################################################

(ns com.tobeconsumed.byjava.fooimpl
  (:import com.tobeconsumed.byjava.IFoo)
  (:gen-class
    :implements [com.tobeconsumed.byjava.IFoo]))

(defn -createListOfTypedObjects
  "Creates and returns a list of TypedObjects"
  [this message]
  (println message)
  [(TypedObject.), (TypedObject.), (TypedObject.), (TypedObject.)])

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <artifactId>interop</artifactId>
    <groupId>interop</groupId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <groupId>interop</groupId>
  <artifactId>functional</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>functional</name>
  <description>Some functional code.</description>

  <repositories>
    <repository>
      <id>clojars</id>
      <url>http://clojars.org/repo/</url>
    </repository>
    <repository>
      <id>clojure-releases</id>
      <url>http://build.clojure.org/releases</url>
    </repository>
    <repository>
      <id>clojure-snapshots</id>
      <url>http://build.clojure.org/snapshots</url>
    </repository>
    <repository>
      <id>central</id>
      <url>http://repo1.maven.org/maven2</url>
    </repository>
  </repositories>

  <dependencies>
    <dependency>
      <groupId>interop</groupId>
      <artifactId>domainobjects</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.clojure</groupId>
      <artifactId>clojure</artifactId>
      <version>1.2.0</version>
      <type>pom</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.clojure</groupId>
      <artifactId>clojure-contrib</artifactId>
      <version>1.2.0</version>
      <type>pom</type>
      <scope>compile</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
        <plugin>
        <groupId>com.theoryinpractise</groupId>
        <artifactId>clojure-maven-plugin</artifactId>
        <version>1.3.3</version>
        <configuration>
            <project>
                <build>
                    <sourceDirectory>src/main/clojure</sourceDirectory>
                    <testSourceDirectory>src/test/clojure</testSourceDirectory>
                </build>
            </project>
        </configuration>
        <executions>
         <execution>
           <id>compile</id>
           <phase>compile</phase>
           <goals>
             <goal>compile</goal>
           </goals>
         </execution>
         <execution>
           <id>test-clojure</id>
           <phase>test</phase>
           <goals>
             <goal>test</goal>
           </goals>
         </execution>
       </executions>
      </plugin>
    </plugins>
  </build>

</project>


######################################################################################



package consumer;

import java.util.List;

import com.tobeconsumed.byjava.IFoo;
import com.tobeconsumed.byjava.TypedObject;
import com.tobeconsumed.byjava.fooimpl;

public class JavaConsumer {

    public List<TypedObject> callCreateListOfTypedObjects() {
        IFoo foo = new fooimpl();
        List<TypedObject> listOfTypedObject = foo.createListOfTypedObjects("Returning typed a list");
        return listOfTypedObject;
    }

}


package consumer;

import junit.framework.TestCase;

public class JavaConsumerTest extends TestCase {

    private JavaConsumer javaConsumer;

    protected void setUp() throws Exception {
        javaConsumer = new JavaConsumer();
        super.setUp();
    }

    protected void tearDown() throws Exception {
        javaConsumer = null;
        super.tearDown();
    }

    public void testCallShowMessage() {
        assertNotNull(javaConsumer);
        def result = javaConsumer.callCreateListOfTypedObjects();

        assert 4 == result.size()
    }

}


<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <artifactId>interop</artifactId>
    <groupId>interop</groupId>
    <version>0.0.1-SNAPSHOT</version>
  </parent>
  <groupId>interop</groupId>
  <artifactId>consumer</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <name>consumer</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>interop</groupId>
      <artifactId>functional</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>interop</groupId>
      <artifactId>domainobjects</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.8.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.codehaus.groovy</groupId>
      <artifactId>groovy-all</artifactId>
      <version>1.7.4</version>
    </dependency>    
  </dependencies>
  <build>

    <finalName>consumer</finalName>

    <plugins>
        <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>2.3.1</version>
        <configuration>
          <source>1.6</source>
          <target>1.6</target>
          <project>
            <build>
                <scriptSourceDirectory>src/main/java</scriptSourceDirectory>
                <testSourceDirectory>src/test/java</testSourceDirectory>
            </build>
          </project>
        </configuration>
        <executions>
         <execution>
           <id>compile</id>
           <phase>compile</phase>
           <goals>
             <goal>compile</goal>
           </goals>
         </execution>
         <execution>
           <id>test-java</id>
           <phase>test</phase>
           <goals>
             <goal>testCompile</goal>
           </goals>
         </execution>
       </executions>
      </plugin>
      <plugin>
        <groupId>org.codehaus.gmaven</groupId>
        <artifactId>gmaven-plugin</artifactId>
        <version>1.2</version>
        <extensions>true</extensions>
        <configuration>
            <project>
            <build>
                <sourceDirectory>src/main/groovy</sourceDirectory>
                <testSourceDirectory>src/test/groovy</testSourceDirectory>
            </build>
            </project>
        </configuration>
      </plugin>
      <plugin>
    <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-antrun-plugin</artifactId>
            <executions>
                <execution>
                    <id>compile</id>
                    <phase>compile</phase>
                    <configuration>
                        <tasks>
                            <mkdir dir="${basedir}/src/main/groovy"/>
                            <taskdef name="groovyc"
                                classname="org.codehaus.groovy.ant.Groovyc">
                                <classpath refid="maven.compile.classpath"/>
                            </taskdef>
                            <mkdir dir="${project.build.outputDirectory}"/>
                            <groovyc destdir="${project.build.outputDirectory}"
                                srcdir="${basedir}/src/main/groovy/" listfiles="true">
                                <classpath refid="maven.compile.classpath"/>
                            </groovyc>
                        </tasks>
                    </configuration>
                    <goals>
                        <goal>run</goal>
                    </goals>
                </execution>
                <execution>
                    <id>test-compile</id>
                    <phase>test-compile</phase>
                    <configuration>
                        <tasks>
                            <mkdir dir="${basedir}/src/test/groovy"/>
                            <taskdef name="groovyc"
                                classname="org.codehaus.groovy.ant.Groovyc">
                                <classpath refid="maven.compile.classpath"/>
                            </taskdef>
                            <mkdir dir="${project.build.testOutputDirectory}"/>
                            <groovyc destdir="${project.build.testOutputDirectory}"
                                srcdir="${basedir}/src/test/groovy/" listfiles="true">
                                <classpath refid="maven.test.classpath"/>
                            </groovyc>
                        </tasks>
                    </configuration>
                    <goals>
                        <goal>run</goal>
                    </goals>
                </execution>
            </executions>
       </plugin>      
    </plugins>
  </build>
</project>

######################################################################################

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>interop</groupId>
  <artifactId>interop</artifactId>
  <packaging>pom</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>interop</name>

  <repositories>
    <repository>
      <id>central</id>
      <url>http://repo1.maven.org/maven2</url>
    </repository>
  </repositories>

  <dependencies>
  </dependencies>

  <build>
    <plugins>
    </plugins>
  </build>
  <modules>
    <module>functional</module>
    <module>consumer</module>
    <module>domainobjects</module>
  </modules>

</project>