Infrastructure

package org.dataone.cn.rest;

import org.dataone.service.types.v1.NodeReference;

/**

 * A helper class for UrlChecker.  This class represents the shared state between UrlCheckers

 * running concurrently on different threads, as well as the desired result.

 * 

 * Note that in this case, shared state doesn't require any race-condition avoidance, because

 * any answer is as good as the one it might overwrite. Without synchronization or locks, the code

 * stays very simple.

 * 

 * 

 * @author rnahf

 *

 */

public class ConfirmedNode {

    private NodeReference nr;

    // one would think we should synchronize this method, but since we don't care about

    // the final answer (they are all correct), we can save some overhead.

    public void setNodeReference(NodeReference confirmedNode) {

        if (this.nr == null && confirmedNode != null) {

            // only a valid NodeReference can reach here

            this.nr = confirmedNode;

        }

    }

    public NodeReference getNodeReference() {

        return this.nr;

    }

}