package com.bigdata.bop.fed;
import com.bigdata.bop.engine.AbstractRunningQuery;
/**
* {@link Runnable} will halt the query, interrupting any operators which are
* currently running for that query.
*/
class CancelQuery implements Runnable {
private final AbstractRunningQuery q;
private final Throwable cause;
/**
*
* @param q
* The query.
* @param cause
* The cause (optional). When not give, the normal termination
* semantics apply.
*/
public CancelQuery(final AbstractRunningQuery q, final Throwable cause) {
if (q == null)
throw new IllegalArgumentException();
this.q = q;
this.cause = cause; // MAY be null
}
public void run() {
if (cause == null)
q.halt((Void)null);
else
q.halt(cause);
}
}