/** * PUBLIC: * Set the locking policy to use timestamp version locking. * This updates the timestamp field on all updates, first comparing that the field has not changed to detect locking conflicts. * Note: many database have limited precision of timestamps which can be an issue is highly concurrent systems. * * The parameter 'shouldStoreInCache' configures the version lock value to be stored in the cache or in the object. * Note: if using a stateless model where the object can be passed to a client and then later updated in a different transaction context, * then the version lock value should not be stored in the cache, but in the object to ensure it is the correct value for that object. * @see VersionLockingPolicy */ public void useTimestampLocking(String writeLockFieldName, boolean shouldStoreInCache) { TimestampLockingPolicy policy = new TimestampLockingPolicy(writeLockFieldName); if (shouldStoreInCache) { policy.storeInCache(); } else { policy.storeInObject(); } setOptimisticLockingPolicy(policy); }
/** * PUBLIC: * Set the locking policy to use timestamp version locking. * This updates the timestamp field on all updates, first comparing that the field has not changed to detect locking conflicts. * Note: many database have limited precision of timestamps which can be an issue is highly concurrent systems. * * The parameter 'shouldStoreInCache' configures the version lock value to be stored in the cache or in the object. * Note: if using a stateless model where the object can be passed to a client and then later updated in a different transaction context, * then the version lock value should not be stored in the cache, but in the object to ensure it is the correct value for that object. * @see VersionLockingPolicy */ public void useTimestampLocking(String writeLockFieldName, boolean shouldStoreInCache) { TimestampLockingPolicy policy = new TimestampLockingPolicy(writeLockFieldName); if (shouldStoreInCache) { policy.storeInCache(); } else { policy.storeInObject(); } setOptimisticLockingPolicy(policy); }
/** * PUBLIC: * Set the locking policy to use timestamp version locking. * This updates the timestamp field on all updates, first comparing that the field has not changed to detect locking conflicts. * Note: many database have limited precision of timestamps which can be an issue is highly concurrent systems. * * The parameter 'shouldStoreInCache' configures the version lock value to be stored in the cache or in the object. * Note: if using a stateless model where the object can be passed to a client and then later updated in a different transaction context, * then the version lock value should not be stored in the cache, but in the object to ensure it is the correct value for that object. * @see VersionLockingPolicy */ public void useTimestampLocking(String writeLockFieldName, boolean shouldStoreInCache) { TimestampLockingPolicy policy = new TimestampLockingPolicy(writeLockFieldName); if (shouldStoreInCache) { policy.storeInCache(); } else { policy.storeInObject(); } setOptimisticLockingPolicy(policy); }
/** * INTERNAL: * Process a version accessor. */ @Override public void process() { // This will initialize the m_field variable. Accessible through getField(). super.process(); // Process an @Version or version element if there is one. if (getDescriptor().usesOptimisticLocking()) { // Ignore the version locking if it is already set. getLogger().logConfigMessage(MetadataLogger.IGNORE_VERSION_LOCKING, this); } else { MetadataClass lockType = getRawClass(); getDatabaseField().setTypeName(getJavaClassName(lockType)); if (isValidVersionLockingType(lockType) || isValidTimestampVersionLockingType(lockType)) { for (MetadataDescriptor owningDescriptor : getOwningDescriptors()) { VersionLockingPolicy policy = isValidVersionLockingType(lockType) ? new VersionLockingPolicy(getDatabaseField()) : new TimestampLockingPolicy(getDatabaseField()); policy.storeInObject(); policy.setIsCascaded(getDescriptor().usesCascadedOptimisticLocking()); owningDescriptor.setOptimisticLockingPolicy(policy); } } else { throw ValidationException.invalidTypeForVersionAttribute(getAttributeName(), lockType, getJavaClass()); } } } }