Example usage for javax.persistence LockModeType WRITE

Introduction

In this page you can find the example usage for javax.persistence LockModeType WRITE.

Prototype

LockModeType WRITE

To view the source code for javax.persistence LockModeType WRITE.

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Document

Synonymous with OPTIMISTIC_FORCE_INCREMENT.

Usage

From source file:org.apache.camel.bam.processor.ActivityMonitorEngine.java

@SuppressWarnings("unchecked")
protected void fireExpiredEvent(final ActivityState activityState) {
    if (LOG.isDebugEnabled()) {
        LOG.debug("Trying to fire expiration of: " + activityState);
    }//from  www .  j av a2 s  . c  om

    template.execute(new JpaCallback() {
        public Object doInJpa(EntityManager entityManager) throws PersistenceException {
            // lets try lock the object first
            if (isUseLocking()) {
                LOG.info("Attempting to lock: " + activityState);
                entityManager.lock(activityState, LockModeType.WRITE);
                LOG.info("Grabbed lock: " + activityState);
            }

            try {
                rules.processExpired(activityState);
            } catch (Exception e) {
                LOG.error("Failed to process expiration of: " + activityState + ". Reason: " + e, e);
            }
            activityState.setTimeOverdue(null);
            //activityState.setEscalationLevel(escalateLevel + 1);
            return null;
        }
    });
}

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From source file:org.apache.camel.component.jpa.JpaConsumer.java

/**
 * A strategy method to lock an object with an exclusive lock so that it can
 * be processed//w  w w  .j a  v a  2  s. com
 * 
 * @param entity the entity to be locked
 * @param entityManager entity manager
 * @return true if the entity was locked
 */
protected boolean lockEntity(Object entity, EntityManager entityManager) {
    if (!getEndpoint().isConsumeDelete() || !getEndpoint().isConsumeLockEntity()) {
        return true;
    }
    try {
        if (LOG.isDebugEnabled()) {
            LOG.debug("Acquiring exclusive lock on entity: " + entity);
        }
        entityManager.lock(entity, LockModeType.WRITE);
        return true;
    } catch (Exception e) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("Failed to achieve lock on entity: " + entity + ". Reason: " + e, e);
        }
        return false;
    }
}

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