java-func-caller

java-func-caller

use spawn call the java method which the jar support. if want the java method can be called by node, the jar file must be meet three conditions.

• first, the jar must be a runableble jar file and the name of the jar must be the main class full name. for example your jar's main class is : your.foo.Main, then your jar name must be : your.foo.Main.jar。

• sencod, the main class of the jar must has a public static method: public static Map<String, Object> run(List args)

• the map which run method return must contains the following keys

  • status, must, 0 sucess, negative value failed.
  • value, optional, the value return to the node function when successed.
  • error_msg, optional, if failed please set it.
  • exception, optional, if failed please set it.

if the jar meet the two onditions, the your can call the method use the following code:

var FuncCaller = require('java-func-caller');
var caller = new FuncCaller([__dirname + './your.foo.Main.jar']);

caller.callFunc({
    func    : 'your.foo.Main',
    params  : [1, 2, 3, 4, 5],
    success : function(data){
        console.log('success => task id:' + data.task_id + ' value:' + data.value);
    },
    error   : function(data){
        console.log('error => ' + data.error_msg);
    }
});

A Foo main class

package org.myless.func;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class FooFunc {
    public static void main(String... args){}
    
    public static Map<String, Object> run(List<String> args){
        Map<String, String> result = new HashMap<String, String>();
        
        result.put("status", String.valueOf(0));
        result.put("value", "join result: " + join(args));
        
        return result;
    }
    
    public static String join(List<String> args){
        if(args == null || args.size() == 0) { return ""; }
        
        StringBuffer buff = new StringBuffer();
        
        for(String i : args){
            buff.append(i);
        }
        
        return buff.toString();
    }
}