Question

I have a static method as following:

public static void writeArticle(TypeA typeA, TypeB typeB) {
  AWriter writer =  AFactory.getWriter("aWriter");
  Article article = writer.newArticle();

  /* PARAMETER WRITE START */

  article.set("title", typeA.getTitle());
  article.set("author", typeB.getName());
  article.set("age", typeB.getAge());
  // …
  /* more set statments here */
  writer.write(article);
}

Could this method cause a problem that the writer will write a value-mixed Article? That is, when 2 class (Class A and ClassB) instances calling this method, will Article get some of typeA values from ClassA and some from ClassB?

Answer 1

No. Why do you think the arguments from two different calls would get mixed up? There’s no reason to think they would.

If this is a multi-threaded program, you should ofcourse be careful with sharing objects between threads; if those objects have mutable state (member variables that can be changed) you should take care that two threads are not modifying the state at the same time.