Example usage for org.hibernate NonUniqueObjectException getIdentifier

Introduction

In this page you can find the example usage for org.hibernate NonUniqueObjectException getIdentifier.

Prototype

public Serializable getIdentifier() 

Source Link

Usage

From source file:de.innovationgate.webgate.api.jdbc.WGDocumentImpl.java

License:Open Source License

/**
 * Performs an operation involving entity updates and catches possibly appearing {@link NonUniqueObjectException}s.
 * Those exceptions are solved by evicting every entity which causes it and retrying the operation.
 * @param task The update operation/*  w w  w . j  ava 2 s.c o  m*/
 * @param session The hibernate session to use to load the entity
 * @param retries The number of operation retries before a {@link WGBackendException} exception is thrown to cancel the operation.
 * @throws Exception
 */
private void performUpdateOperation(Callable<Boolean> task, Session session, int retries, Object entity)
        throws Exception {

    int repeatCount = 0;
    while (true) {

        repeatCount++;
        if (repeatCount > 1000) {
            throw new WGBackendException(
                    "Update of document failed because of persistent duplicates more than 1000 times. Cancelling update.");
        }

        try {
            task.call();
            break;
        }

        // Another persistent version was loaded somehow. Evict it and try to update again.
        catch (NonUniqueObjectException e) {
            Object otherObject = session.load(e.getEntityName(), e.getIdentifier());
            session.evict(otherObject);
            if (entity != null) {
                session.evict(entity);
            }
        }
    }

}

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