VoidRunnable.java

package org.needle4j.db.transaction;

import javax.persistence.EntityManager;

/**
 * Default implementation of {@link Runnable}. Does nothing.
 */
public abstract class VoidRunnable implements Runnable<Object> {
    /**
     * {@inheritDoc}
     */
    @Override
    public final Object run(final EntityManager entityManager) throws Exception {
        doRun(entityManager);
        return null;
    }

    /**
     * Hook method inside run().
     * 
     * @param entityManager
     *            entityManager
     * 
     * @throws Exception
     *             when something failed
     */
    public abstract void doRun(EntityManager entityManager) throws Exception;
}