int
IceInternal::ProxyFactory::checkRetryAfterException(const LocalException& ex,
const ReferencePtr& ref,
bool sleep,
int& cnt) const
{
TraceLevelsPtr traceLevels = _instance->traceLevels();
LoggerPtr logger = _instance->initializationData().logger;
//
// We don't retry batch requests because the exception might have caused
// the all the requests batched with the connection to be aborted and we
// want the application to be notified.
//
if(ref->getMode() == Reference::ModeBatchOneway || ref->getMode() == Reference::ModeBatchDatagram)
{
ex.ice_throw();
}
const ObjectNotExistException* one = dynamic_cast<const ObjectNotExistException*>(&ex);
if(one)
{
if(ref->getRouterInfo() && one->operation == "ice_add_proxy")
{
//
// If we have a router, an ObjectNotExistException with an
// operation name "ice_add_proxy" indicates to the client
// that the router isn't aware of the proxy (for example,
// because it was evicted by the router). In this case, we
// must *always* retry, so that the missing proxy is added
// to the router.
//
ref->getRouterInfo()->clearCache(ref);
if(traceLevels->retry >= 1)
{
Trace out(logger, traceLevels->retryCat);
out << "retrying operation call to add proxy to router\n" << ex;
}
return 0; // We must always retry, so we don't look at the retry count.
}
else if(ref->isIndirect())
{
//
// We retry ObjectNotExistException if the reference is
// indirect.
//
if(ref->isWellKnown())
{
LocatorInfoPtr li = ref->getLocatorInfo();
if(li)
{
li->clearCache(ref);
}
}
}
else
{
//
// For all other cases, we don't retry
// ObjectNotExistException.
//
ex.ice_throw();
}
}
else if(dynamic_cast<const RequestFailedException*>(&ex))
{
//
// We don't retry other *NotExistException, which are all
// derived from RequestFailedException.
//
ex.ice_throw();
}
//
// There is no point in retrying an operation that resulted in a
// MarshalException. This must have been raised locally (because
// if it happened in a server it would result in an
// UnknownLocalException instead), which means there was a problem
// in this process that will not change if we try again.
//
// The most likely cause for a MarshalException is exceeding the
// maximum message size, which is represented by the subclass
// MemoryLimitException. For example, a client can attempt to send
// a message that exceeds the maximum memory size, or accumulate
// enough batch requests without flushing that the maximum size is
// reached.
//
// This latter case is especially problematic, because if we were
// to retry a batch request after a MarshalException, we would in
// fact silently discard the accumulated requests and allow new
// batch requests to accumulate. If the subsequent batched
// requests do not exceed the maximum message size, it appears to
// the client that all of the batched requests were accepted, when
// in reality only the last few are actually sent.
//
if(dynamic_cast<const MarshalException*>(&ex))
{
ex.ice_throw();
}
++cnt;
assert(cnt > 0);
int interval = -1;
if(cnt == static_cast<int>(_retryIntervals.size() + 1) &&
dynamic_cast<const CloseConnectionException*>(&ex))
{
//
// A close connection exception is always retried at least once, even if the retry
// limit is reached.
//
interval = 0;
}
else if(cnt > static_cast<int>(_retryIntervals.size()))
{
if(traceLevels->retry >= 1)
{
Trace out(logger, traceLevels->retryCat);
out << "cannot retry operation call because retry limit has been exceeded\n" << ex;
}
ex.ice_throw();
}
else
{
interval = _retryIntervals[cnt - 1];
}
if(traceLevels->retry >= 1)
{
Trace out(logger, traceLevels->retryCat);
out << "retrying operation call";
if(interval > 0)
{
out << " in " << interval << "ms";
}
out << " because of exception\n" << ex;
}
if(sleep && interval > 0)
{
//
// Sleep before retrying.
//
IceUtil::ThreadControl::sleep(IceUtil::Time::milliSeconds(interval));
}
return interval;
}
