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package bjc.esodata;
import java.util.Iterator;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingDeque;
import java.util.function.Consumer;
/**
* A default implementation of {@link Spool} using a {@link LinkedBlockingDeque}
* as the backing storage.
*
* @author bjcul
*
* @param <T> The type contained in the spool
*/
public class DefaultSpool<T> implements Spool<T>, AutoCloseable {
private String label;
private String group;
private BlockingQueue<T> container;
private boolean closed;
/**
* Create a new spool without label or group
*/
public DefaultSpool() {
this(null, null);
}
/**
* Create a new spool with a given label and group.
*
* @param label The label of the spool
* @param group The group for the spool
*/
public DefaultSpool(String label, String group) {
this.label = label;
this.group = group;
this.container = new LinkedBlockingDeque<>();
this.closed = false;
}
@Override
public String label() {
return label;
}
@Override
public String group() {
return group;
}
@Override
public Consumer<T> getInput() {
return (val) -> {
if (closed) {
throw new ClosedSpoolException();
}
container.add(val);
};
}
@Override
public Iterator<T> getOutput() {
return container.iterator();
}
@Override
public boolean isClosed() {
return false;
}
@Override
public void close() throws Exception {
closed = true;
}
}
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