Hi Stephen,
Thank you for replying.
In our use case we cannot use sql queries to get desired result. Is there
any other way that we can use to plug custom implementation of equals and
hashCode method for objects which are going to store in caches?
Thank you ,
Saurabh Satardekar.
On Fri, 17 Jun 2022, 9:42 pm Stephen Darlington, <
stephen.darling...@gridgain.com> wrote:
> If you enable SQL on your table, then you can run a query that filters on
> a subset of the properties. You can also add an index to make the lookup
> more quickly.
>
> On 17 Jun 2022, at 16:55, Saurabh Satardekar <satardekarsaur...@gmail.com>
> wrote:
>
> 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.
>
>
>
