Respected Sir/Madam,
We have following use case where we have Book class as follows :
public class Book {
private int price;
private String bookName;
private String authorName;
public Book( String bookName, String authorName, int price ) {
this.bookName = bookName;
this.authorName = authorName;
this.price = price;
}
@Override
public boolean equals(Object o) {
if( this == o ) return true;
if( o == null || getClass() != o.getClass() ) return false;
Book that = (Book) o;
return bookName.equals(that.bookName) && authorName.equals(that.authorName);
}
@Override
public int hashCode() {
return Objects.hash(bookName,authorName);
}
}
For the above class we need to compare books by using book name and its
author name only. We don't want to include price while comparing books but
we can't even store that information anywhere else.
So if I have two objects as follows :
Book book_1 = new Book("Book_1","ABC",100);
Book book_2 = new Book("Book_1","ABC",200);
For above objects, if I use book_1 object as my cache key and put some
value against it into cache, I am not able to retrieve that value using my
another object book_2 as ignite is not honoring equals method provided on
Book class.
We have tried implementing Externalizable interface and also by providing
custom implementation of BinaryIdentityResolver interface. Still we are not
getting desired output.
Note : This is a sample class which we have used to describe a problem, in
reality we are using other classes and we have a valid use case where we
don't want to use all attributes of the class while comparing them for
equality ( in equals and hashCode method ).
Thank you,
Saurabh Satardekar.
