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package bjc.esodata;
import java.util.Iterator;
import java.util.function.Consumer;
/**
* A single spool, or batch of input.
*
* @author bjcul
*
* @param <T> The type contained by the spool
*/
public interface Spool<T> {
/**
* Get the label that identifies this spool, if it has one.
*
* @return The label of the spool, or null if it is unlabeled.
*/
public String label();
/**
* Get the group that this spool belongs to, if it belongs to one.
*
* @return The group the spool is in, or null if it is not in a group.
*/
public String group();
/**
* Get a function that will add input to this spool
*
* @return A function that will add input to this spool.
*/
public Consumer<T> getInput();
/**
* Get an iterator that will iterate over the data contained in this spool.
*
* @return An iterator over the data in this spool.
*/
public Iterator<T> getOutput();
/**
* Is this spool closed, meaning it can accept no more input?
*
* @return Whether the spool is closed
*/
public boolean isClosed();
}
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