We are catching objects of tree structured class in cache. Following is the 
signature of class

Class :  MyClass
An object of MyClass can have any number of children of the same type and 
children can have any number of their children as well. This can continue upto 
N level.

Methods
public MyClass addChild (MyClass child) 
public Collection getChildren (ArralyList filter)
This method take ArrayList as an input and return ArrayList of children - 
baring those which exist in ArrayList filter. Method uses Iterator to traverse 
through ArrayList during filtration. 

We fetch these objects from cache, traverse through them and read all node 
values. We are accessing these objects in read-only mode; there will not be any 
write operation on these objects.

Problem:
Total concurrent users of the application are around 20K and multiple thread 
are going to call getChildren(ArralyList filter). Parameter value for filter 
will very from user to user. Now suppose first thread calls getChildren 
(ArrayList filter) method and it reaches half the way. First thread loose the 
control and second thread get the control and calls getChildren (ArrayList 
filter) by passing different value for parameter filter.

Will this operation thread safe?

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