/**
 * A component which marks a {@link com.artemis.Entity} as a chunk and stores its most valuable informations.
 */
@Entity
@Table(name = "chunk", uniqueConstraints = {@UniqueConstraint(columnNames={"x", "y"})}, indexes = {@Index(columnList = "x,y")})
@Access(value = AccessType.FIELD)
public class Chunk extends HibernateComponent {

    public int x;
    public int y;
    public Date createdOn;

    @OneToMany(cascade = {CascadeType.PERSIST, CascadeType.REMOVE}, fetch = FetchType.EAGER)
    @Fetch(FetchMode.JOIN)
    @BatchSize(size = 100)
    public Set<Location> inChunk = new LinkedHashSet<>();

    @Transient
    public Set<ChunkLoader> loadedBy = new LinkedHashSet<>();

    public Chunk() {}
    public Chunk(int x, int y, Date createdOn) {
        this.x = x;
        this.y = y;
        this.createdOn = createdOn;
    }
}


// later on a system checks what "locations" ( from resources, what ever ) belong inside which chunk and inserts the reference into .inChunk... this happens while we create new trees for example
// Meanwhile the updating system runs its query generation and suddenly stores a reference to a location which is not saved yet... it tries to update the chunk and boom... exception