How to Pass Sig from Alloy to Java and execute alloy model from Java

I have built an alloy model where I have put all my system logic. I want to do a large scale analysis. For doing that, my logic is to use Java to read the data file, then pass those data to Alloy to check whether those met the constraint I defined in the Alloy or not. To do that, my logic is to create sig object using those data and pass those to Alloy.

As my system model is complex, I am trying to summarize my problem using the following code-

sig A{
val: Int
}

sig B{
chunk: Int
}


fact {

    A.val > 10 && A.val < 15
}

Now, I want to pass the following sig object and run command from Java.

sig C{

name: String
}

run {} for 4

How can I pass that code? I am following this link https://github.com/ikuraj/alloy/blob/master/src/edu/mit/csail/sdg/alloy4whole/ExampleUsingTheAPI.java . But not able to figure it out.