/**
* Given a new or modified port newPort, returns the list of PortChangeEvents to "transform" the
* current ports stored by this switch to include / represent the new port. The ports stored by
* this switch are <b>NOT</b> updated.
*
* <p>This method acquires the readlock and is thread-safe by itself. Most callers will need to
* acquire the write lock before calling this method though (if the caller wants to update the
* ports stored by this switch)
*
* @param newPort the new or modified port.
* @return the list of changes
*/
public OrderedCollection<PortChangeEvent> getSinglePortChanges(OFPortDesc newPort) {
lock.readLock().lock();
try {
OrderedCollection<PortChangeEvent> events = new LinkedHashSetWrapper<PortChangeEvent>();
// Check if we have a port by the same number in our
// old map.
OFPortDesc prevPort = portsByNumber.get(newPort.getPortNo());
if (newPort.equals(prevPort)) {
// nothing has changed
return events;
}
if (prevPort != null && prevPort.getName().equals(newPort.getName())) {
// A simple modify of a exiting port
// A previous port with this number exists and it's name
// also matches the new port. Find the differences
if ((!prevPort.getState().contains(OFPortState.LINK_DOWN)
&& !prevPort.getConfig().contains(OFPortConfig.PORT_DOWN))
&& (newPort.getState().contains(OFPortState.LINK_DOWN)
|| newPort.getConfig().contains(OFPortConfig.PORT_DOWN))) {
events.add(new PortChangeEvent(newPort, PortChangeType.DOWN));
} else if ((prevPort.getState().contains(OFPortState.LINK_DOWN)
|| prevPort.getConfig().contains(OFPortConfig.PORT_DOWN))
&& (!newPort.getState().contains(OFPortState.LINK_DOWN)
&& !newPort.getConfig().contains(OFPortConfig.PORT_DOWN))) {
events.add(new PortChangeEvent(newPort, PortChangeType.UP));
} else {
events.add(new PortChangeEvent(newPort, PortChangeType.OTHER_UPDATE));
}
return events;
}
if (prevPort != null) {
// There exists a previous port with the same port
// number but the port name is different (otherwise we would
// never have gotten here)
// Remove the port. Name-number mapping(s) have changed
events.add(new PortChangeEvent(prevPort, PortChangeType.DELETE));
}
// We now need to check if there exists a previous port sharing
// the same name as the new/updated port.
prevPort = portsByName.get(newPort.getName().toLowerCase());
if (prevPort != null) {
// There exists a previous port with the same port
// name but the port number is different (otherwise we
// never have gotten here).
// Remove the port. Name-number mapping(s) have changed
events.add(new PortChangeEvent(prevPort, PortChangeType.DELETE));
}
// We always need to add the new port. Either no previous port
// existed or we just deleted previous ports with inconsistent
// name-number mappings
events.add(new PortChangeEvent(newPort, PortChangeType.ADD));
return events;
} finally {
lock.readLock().unlock();
}
}
