package com.bigdata.bop.fed.shards;
import com.bigdata.bop.IBindingSet;
import com.bigdata.bop.IPredicate;
/**
* Interface for mapping {@link Bundle}s over shards.
*
* @param <F>
* The generic type of the elements for the target
* {@link IPredicate}.
*
* @todo Optimize locator lookup by caching and look at the locator scan
* code path.
* <p>
* For reads, we are permitted to cache the locators just as much as
* we like (but indirection would be introduced by a shared disk
* architecture).
* <p>
* For writes (or in a shard disk architecture) it is possible that
* the target shard will have moved by the time the receiver has
* notice of the intent to write on that shard or once the receiver
* has accepted the binding sets for that shard. The logic which moves
* the binding sets around will have to handle such 'stale locator'
* exceptions automatically.
*/
interface IShardMapper<E extends IBindingSet, F> {
void mapOverShards(Bundle<F>[] bundles);
}