Spring Cache Key Using Arguments - spring

Question

I have a class Person with properties id, name and age.
I would like to cache Person object using id and name.
my method is
#Cacheable(value = "person", key = "#p.id + p.name")
getPerson(Person p).
Question is, how do i use cache annotation on getPerson()... something like this.

Answer 1

Using the annotation you could concatenate the values to create a key (I read but have not tested tha the debug symbols may be removed and so the parameter should be referenced as "p0").
#Cacheable(value="person", key="#p0.id.concat(‘:’).concat(#p0.name)")
Otherwise, it will be cached based on Person class equals() and hashCode() just the same way as if you were using the Person object as a key in a Map.
So, for example:
public class Person {
String id;
String name;
Number age;
#Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((id == null) ? 0 : id.hashCode());
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
#Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (!(obj instanceof Person))
return false;
Person other = (Person) obj;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
return true;
}
}