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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
#include <Glacier2/RoutingTable.h>
#include <Glacier2/Instrumentation.h>
using namespace std;
using namespace Ice;
using namespace Glacier2;
Glacier2::RoutingTable::RoutingTable(shared_ptr<Communicator> communicator, shared_ptr<ProxyVerifier> verifier) :
_communicator(move(communicator)),
_traceLevel(_communicator->getProperties()->getPropertyAsInt("Glacier2.Trace.RoutingTable")),
_maxSize(_communicator->getProperties()->getPropertyAsIntWithDefault("Glacier2.RoutingTable.MaxSize", 1000)),
_verifier(move(verifier))
{
}
void
Glacier2::RoutingTable::destroy()
{
lock_guard<mutex> lg(_mutex);
if(_observer)
{
_observer->routingTableSize(-static_cast<int>(_map.size()));
}
_observer.detach();
}
shared_ptr<Glacier2::Instrumentation::SessionObserver>
Glacier2::RoutingTable::updateObserver(const shared_ptr<Glacier2::Instrumentation::RouterObserver>& obsv,
const string& userId,
const shared_ptr<Ice::Connection>& connection)
{
lock_guard<mutex> lg(_mutex);
_observer.attach(obsv->getSessionObserver(userId, connection, static_cast<int>(_map.size()), _observer.get()));
return _observer.get();
}
ObjectProxySeq
Glacier2::RoutingTable::add(const ObjectProxySeq& unfiltered, const Current& current)
{
lock_guard<mutex> lg(_mutex);
size_t sz = _map.size();
//
// We 'pre-scan' the list, applying our validation rules. The
// ensures that our state is not modified if this operation results
// in a rejection.
//
ObjectProxySeq proxies;
for(const auto& prx : unfiltered)
{
if(!prx) // We ignore null proxies.
{
continue;
}
if(!_verifier->verify(prx))
{
current.con->close(ConnectionClose::Forcefully);
throw ObjectNotExistException(__FILE__, __LINE__);
}
auto proxy = prx->ice_twoway()->ice_secure(false)->ice_facet(""); // We add proxies in default form.
proxies.push_back(proxy);
}
ObjectProxySeq evictedProxies;
for(const auto& proxy : proxies)
{
EvictorMap::iterator p = _map.find(proxy->ice_getIdentity());
if(p == _map.end())
{
if(_traceLevel == 1 || _traceLevel >= 3)
{
Trace out(_communicator->getLogger(), "Glacier2");
out << "adding proxy to routing table:\n" << _communicator->proxyToString(proxy);
}
auto entry = make_shared<EvictorEntry>();
p = _map.insert(_map.begin(), {proxy->ice_getIdentity(), entry});
EvictorQueue::iterator q = _queue.insert(_queue.end(), p);
entry->proxy = proxy;
entry->pos = q;
}
else
{
if(_traceLevel == 1 || _traceLevel >= 3)
{
Trace out(_communicator->getLogger(), "Glacier2");
out << "proxy already in routing table:\n" << _communicator->proxyToString(proxy);
}
auto entry = p->second;
_queue.erase(entry->pos);
EvictorQueue::iterator q = _queue.insert(_queue.end(), p);
entry->pos = q;
}
while(static_cast<int>(_map.size()) > _maxSize)
{
p = _queue.front();
if(_traceLevel >= 2)
{
Trace out(_communicator->getLogger(), "Glacier2");
out << "evicting proxy from routing table:\n" << _communicator->proxyToString(p->second->proxy);
}
evictedProxies.push_back(p->second->proxy);
_map.erase(p);
_queue.pop_front();
}
}
if(_observer)
{
_observer->routingTableSize(static_cast<int>(_map.size()) - static_cast<int>(sz));
}
return evictedProxies;
}
shared_ptr<ObjectPrx>
Glacier2::RoutingTable::get(const Identity& ident)
{
if(ident.name.empty())
{
return 0;
}
lock_guard<mutex> lg(_mutex);
EvictorMap::iterator p = _map.find(ident);
if(p == _map.end())
{
return 0;
}
else
{
auto entry = p->second;
_queue.erase(entry->pos);
EvictorQueue::iterator q = _queue.insert(_queue.end(), p);
entry->pos = q;
return entry->proxy;
}
}
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