i face similar case,i implement key like below,and put jar contains
contactKey class into ignite lib .then i can get result
public class ContactKey implements Externalizable {
private Long id;
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
ContactKey that = (ContactKey) o;
return Objects.equal(id, that.id);
}
@Override
public int hashCode() {
return Objects.hashCode(id);
}
@Override
public void writeExternal(ObjectOutput out) throws IOException {
out.writeLong(id);
}
@Override
public void readExternal(ObjectInput in) throws IOException {
this.id = in.readLong();
}
Saurabh Satardekar <satardekarsaur...@gmail.com> 于2022年6月17日周五 23:57写道：
> 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.
>
