Spring Framework

public class ThreadScope implements Scope {

  private final ThreadLocal threadScope = new ThreadLocal() {
      protected Object initialValue() {
        return new HashMap();
      }
    };
  
  public Object get(String name, ObjectFactory objectFactory) {
    Map scope = (Map) threadScope.get();
    Object object = scope.get(name);
    if(object==null) {
      object = objectFactory.getObject();
      scope.put(name, object);
    }
    return object;
  }

  public Object remove(String name) {
    Map scope = (Map) threadScope.get();
    return scope.remove(name);
  }

  public void registerDestructionCallback(String name, Runnable callback) {
  }
  
}