[jboss-jira] [JBoss JIRA] (JGRP-1250) Quality of service properties per message

[ https://issues.jboss.org/browse/JGRP-1250?page=com.atlassian.jira.plugin.... ] Bela Ban commented on JGRP-1250: -------------------------------- I decided to change Message.flags from a byte to short. The reason is that it is impossible to introduce variable bitsets, in other words to add a random number of bits to a message: - A byte array would introduce a ref plus the usual object overhead plus the length - Same for a bit set - A header would work, but setting and querying flags should be *fast*, so the 'flags' field needs to be part of a message - Users wanting to add arbitrary information usually need more than bits, and this can be done with headers - Message.flags is usually only used by JGroups (internally), so adding another 8 flags (going from 7 to 15 bits in a short) should be sufficient for the foreseeable future. - Adding a byte (diff between short and byte) to org.jgroups.Message may not even increase the memory footprint of a message, as padding (aligning objects on word boundaries) will likely allocate more memory for an object than the sum of its fields require anyway -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.jboss.org/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira