/** Message contains a Command. Execute it against *this* object and return result. */
@Override
public void handle(Message req, org.jgroups.blocks.Response response) throws Exception {
if (isValid(req)) {
ReplicableCommand cmd = null;
try {
cmd =
(ReplicableCommand)
req_marshaller.objectFromBuffer(
req.getRawBuffer(), req.getOffset(), req.getLength());
if (cmd == null)
throw new NullPointerException("Unable to execute a null command! Message was " + req);
if (req.getSrc() instanceof SiteAddress) {
executeCommandFromRemoteSite(cmd, req, response);
} else {
executeCommandFromLocalCluster(cmd, req, response);
}
} catch (InterruptedException e) {
log.shutdownHandlingCommand(cmd);
reply(response, new ExceptionResponse(new CacheException("Cache is shutting down")));
} catch (Throwable x) {
if (cmd == null) log.errorUnMarshallingCommand(x);
else log.exceptionHandlingCommand(cmd, x);
reply(response, new ExceptionResponse(new CacheException("Problems invoking command.", x)));
}
} else {
reply(response, null);
}
}
@Override
public Object perform(InvocationContext ctx) throws Throwable {
final boolean trace = log.isTraceEnabled();
LogFactory.pushNDC(cacheName, trace);
stateTransferManager.waitForJoinToStart();
try {
switch (type) {
case APPLY_STATE:
stateTransferManager.applyState(state, sender, viewId);
return null;
case APPLY_LOCKS:
stateTransferManager.applyLocks(locks, sender, viewId);
return null;
default:
throw new CacheException("Unknown rehash control command type " + type);
}
} catch (Throwable t) {
log.exceptionHandlingCommand(this, t);
return null;
} finally {
LogFactory.popNDC(trace);
}
}
