Not sure what you mean by an assembler class.. I guess you mean
https://jena.apache.org/documentation/assembler/index.html
?
Best practice thread-safe singleton pattern in Java is:
public class Blah {
/* Private constructor, use getInstance() */
private Blah();
private static class Singleton {
// will be late-bound by Singleton's class initializer
private final Blag INSTANCE = new Blah();
}
public static Blah getInstance() {
return Singleton.INSTANCE;
}
}
Then of course any Assembler subclass can just use:
public class FooAssembler implements Assembler {
private static Blah blah = Blah.getInstance();
}
which would then be bound at the first point of constructing
FooAssembler or using FooAssembler static methods.
If it's more complicated (your singleton needs another singleton!) you
should rather extends Jena's initialization system so the order is
fixed.
https://jena.apache.org/documentation/notes/system-initialization.html
But to me both of these feel wrong as a Cassandra connection
presuambly is parameterized and could be multiple of - so a singleton
is not quite right.
On 5 December 2016 at 13:40, Claude Warren <[email protected]> wrote:
> I am looking for a way to create a single instance of an object across a
> number of assembler classes (Specifically a Cassandra connection), is there
> a standard singleton assembler pattern? If so where can I find it?
>
> Claude
>
> --
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--
Stian Soiland-Reyes
http://orcid.org/0000-0001-9842-9718
