Runnable.java

package org.needle4j.db.transaction;

import javax.persistence.EntityManager;

/**
 * Interface for passing algorithms to executeInTransaction().
 * 
 * @param <T>
 *            - return type of run()
 */
public interface Runnable<T> {
    /**
     * Operation to be automatically called inside executeInTransaction().
     * 
     * @param entityManager
     *            an {@link javax.persistence.EntityManager}
     * @return return value of the operation
     * @throws Exception
     *             thrown when something failed
     */
    T run(EntityManager entityManager) throws Exception;
}