// Constructor
// =============================================================================================
Subscription::Subscription(
LoggerFactory* loggerFactory,
const SubscriptionSettings& subscriptionSettings,
ClientSubscriptionHandle clientSubscriptionHandle,
ClientConnectionId clientConnectionId,
UaClientSdk::UaSession* uaSession,
UaClientSdk::UaSubscriptionCallback* uaSubscriptionCallback,
uafc::ClientInterface* clientInterface,
Database* database)
: uaSession_(uaSession),
uaSubscriptionCallback_(uaSubscriptionCallback),
subscriptionSettings_(subscriptionSettings),
clientSubscriptionHandle_(clientSubscriptionHandle),
clientConnectionId_(clientConnectionId),
database_(database),
clientInterface_(clientInterface),
clientHandle_(0)
{
// build the logger name:
stringstream loggerName;
loggerName << "Subscription-" << int(clientSubscriptionHandle);
logger_ = new Logger(loggerFactory, loggerName.str());
subscriptionState_ = uafc::subscriptionstates::Deleted;
uaSubscription_ = 0;
logger_->debug("Subscription %d has been constructed", clientSubscriptionHandle);
logger_->debug("Subscription settings:");
logger_->debug(subscriptionSettings.toString());
}
// Construct a subscription if needed
// =============================================================================================
Status SubscriptionFactory::acquireSubscription(
const SubscriptionSettings& subscriptionSettings,
Subscription*& subscription)
{
logger_->debug("Acquiring subscription with the following settings:");
logger_->debug(subscriptionSettings.toString());
Status ret;
subscription = 0;
// lock the mutex to make sure the subscriptionMap_ is not being manipulated
UaMutexLocker locker(&subscriptionMapMutex_);
// we'll try to find a similar subscription that can be re-used,
// unless we're creating an "unique" subscription
// (one that is only created for -and used by- the current request)
if (subscriptionSettings.unique)
{
logger_->debug("The requested subscription must be unique");
}
else
{
// loop trough the subscriptions ...
for (SubscriptionMap::const_iterator it = subscriptionMap_.begin();
it != subscriptionMap_.end();
++it)
{
// ... until a suitable one is found
if (it->second->subscriptionSettings() == subscriptionSettings)
{
subscription = it->second;
logger_->debug("A suitable subscription (ClientSubscriptionHandle=%d) already exists",
subscription->clientSubscriptionHandle());
// get the ClientSubscriptionHandle of the subscription
ClientSubscriptionHandle handle = subscription->clientSubscriptionHandle();
// now increment the activity count of the subscription
activityMapMutex_.lock();
activityMap_[handle] = activityMap_[handle] + 1;
activityMapMutex_.unlock();
ret = statuscodes::Good;
break;
}
}
}
// if no subscription exists yet, we create one
if (subscription == 0)
{
ClientSubscriptionHandle clientSubscriptionHandle;
clientSubscriptionHandle = database_->createUniqueClientSubscriptionHandle();
logger_->debug("We create a new subscription with clientSubscriptionHandle %d",
clientSubscriptionHandle);
// create a new subscription instance
subscription = new Subscription(
logger_->loggerFactory(),
subscriptionSettings,
clientSubscriptionHandle,
clientConnectionId_,
uaSession_,
this,
clientInterface_,
database_);
// store the new subscription instance in the subscriptionMap
subscriptionMap_[clientSubscriptionHandle] = subscription;
logger_->debug("The new subscription has been created");
// create an activity count for the subscription
activityMapMutex_.lock();
activityMap_[clientSubscriptionHandle] = 1;
activityMapMutex_.unlock();
// create the subscription on the server
ret = subscription->createSubscription();
}
// 'subscription' now points to an existing Subscription instance
// (i.e. a valid memory location)
// add some diagnostics
if (ret.isGood())
{
activityMapMutex_.lock();
logger_->debug("The requested subscription is acquired (#activities: %d)",
activityMap_[subscription->clientSubscriptionHandle()]);
activityMapMutex_.unlock();
}
else
{
logger_->error("The requested subscription could not be acquired");
}
return ret;
}
