/**
* Check the messenger to the remote peer and attempt to re-create the messenger if necessary.
*
* @return {@code true} if the current messenger is adequate.
* @throws IOException is thrown for errors in creating a new messenger.
*/
private synchronized boolean checkMessenger() throws IOException {
if ((destMessenger != null) && ((destMessenger.getState() & Messenger.USABLE) != 0)) {
// Everything fine!
return true;
}
// Try making a direct messenger first.
if (route != null) {
destMessenger = endpoint.getDirectMessenger(destination, route, true);
}
// Try making a regular messenger if that didn't work.
if ((destMessenger == null) || ((destMessenger.getState() & Messenger.TERMINAL) != 0)) {
destMessenger = null;
destMessenger = endpoint.getMessenger(destination, route);
}
// Dismal failure
if ((destMessenger == null) || ((destMessenger.getState() & Messenger.TERMINAL) != 0)) {
destMessenger = null;
throw new IOException("Unable to create a messenger to " + destination.toString());
}
return true;
}
/**
* Return a messenger suitable for sending to this peer.
*
* @return a messenger to this PVE peer or if <code>null</code> if peer is unreachable.
*/
private Messenger getCachedMessenger() {
boolean updateAlive = false;
synchronized (this) {
if ((null == cachedMessenger) || cachedMessenger.isClosed()) {
cachedMessenger = null;
if (LOG.isEnabledFor(Level.DEBUG)) {
LOG.debug("Getting cached Messenger for " + radv.getName());
}
updateAlive = true;
cachedMessenger = endpoint.getMessenger(getDestAddress(), radv.getRouteAdv());
}
}
if (updateAlive) {
setAlive(null != cachedMessenger);
}
return cachedMessenger;
}