/// <summary>Gets ActiveSubscription from a specific Subscription List by persistance.</summary>
private ActiveSubscription GetActiveSubscription(SubscriptionPersistence _persistence, string _messageHeader, SubscriberFunction _messageFunction)
{
ActiveSubscription result = null;
switch (_persistence)
{
case SubscriptionPersistence.Endless:
{
result = GetEndlessSubscription(_messageHeader, _messageFunction);
break;
}
case SubscriptionPersistence.SingleUse:
{
result = GetSingleSubscription(_messageHeader, _messageFunction);
break;
}
case SubscriptionPersistence.SoloFrame:
{
result = GetSoloSubscription(_messageHeader, _messageFunction);
break;
}
default:
{
break;
}
}
return(result);
}
/// <summary>Removes relevant ActiveSubscription and triggers remove functions.</summary>
private void ClearRemovedSubscriptions(MPac_SubscriberListRemoved _package)
{
//Checks whether MessageHeader's prefix is of interest
string prefix = MessageHelper.GetPrefix(_package.MessageHeader);
if (m_prefixesOfInterest.ContainsKey(prefix))
{
//Checks whether Interest matches existing ActiveSubscription
foreach (Interest interest in m_prefixesOfInterest[prefix])
{
ActiveSubscription subscription = GetActiveSubscription(interest.m_persistence,
_package.MessageHeader, interest.m_messageFunction);
//If it exists, clears ActiveSubscription
if (subscription != null)
{
if (subscription.m_dynamicMessageHeader == _package.MessageHeader)
{
interest.m_removeFunction(_package);
ClearActiveSubscription(interest, _package.MessageHeader);
}
}
}
}
//Checks whether Messageheader matches existing ActiveSubscription
if (m_dynamicMessagesOfInterest.ContainsKey(_package.MessageHeader))
{
//If it exists, clears ActiveSubscription
foreach (Interest interest in m_dynamicMessagesOfInterest[_package.MessageHeader])
{
interest.m_removeFunction(_package);
ClearActiveSubscription(interest, _package.MessageHeader);
}
}
}
/// <summary>
/// This method "rolls forward" subscriptions, which means if the user unsubscribed we
/// make sure the subscription is billed until the end of their billing period by extending
/// the subscription length here.
/// </summary>
public IReadOnlyList <MergedSnapshot> Execute(
DateTime endTimeExclusive,
IReadOnlyList <MergedSnapshot> inputSnapshots)
{
var snapshots = inputSnapshots.ToList();
var activeSubscriptions = new Dictionary <ChannelId, ActiveSubscription>();
for (int i = 0; i < snapshots.Count; i++)
{
var snapshot = snapshots[i];
foreach (var subscription in snapshot.SubscriberChannels.SubscribedChannels)
{
var billingWeekEndDateExclusive = BillingWeekUtilities.CalculateBillingWeekEndDateExclusive(
subscription.SubscriptionStartDate,
snapshot.Timestamp);
ActiveSubscription activeSubscription;
if (activeSubscriptions.TryGetValue(subscription.ChannelId, out activeSubscription))
{
// The following condition is a relaxation to allow people to briefly re-subscribe without
// trigging a whole new billing week, and therefore to reduce anticipated complaints.
// If they restarted their subscription before the minumum end date of their
// previous subscription, then we do not reset the minimum end date yet.
// However if they exceed that billing week then the new subscription's billing week will be used.
if (snapshot.Timestamp < activeSubscription.BillingWeekEndDateExclusive)
{
billingWeekEndDateExclusive = activeSubscription.BillingWeekEndDateExclusive;
}
activeSubscription = new ActiveSubscription(billingWeekEndDateExclusive, subscription);
activeSubscriptions[subscription.ChannelId] = activeSubscription;
}
else
{
activeSubscription = new ActiveSubscription(billingWeekEndDateExclusive, subscription);
activeSubscriptions.Add(subscription.ChannelId, activeSubscription);
}
}
// Copy the list so we can modify activeSubscriptions within the loop.
foreach (var activeSubscription in activeSubscriptions.Values.ToList())
{
var activeChannelId = activeSubscription.Subscription.ChannelId;
if (snapshot.SubscriberChannels.SubscribedChannels.All(v => !v.ChannelId.Equals(activeChannelId)))
{
// The subscriber has unsubscribed from this channel.
var billingWeekFinalSnapshotTime = this.GetBillingWeekFinalSnapshotTime(activeSubscription.BillingWeekEndDateExclusive);
var subscriptionDuration = snapshot.Timestamp - activeSubscription.Subscription.SubscriptionStartDate;
if (subscriptionDuration.TotalDays > DaysInWeek)
{
// We have exceeded the minimum subscripion period, so there is nothing to adjust.
activeSubscriptions.Remove(activeSubscription.Subscription.ChannelId);
}
else if (snapshot.Timestamp == billingWeekFinalSnapshotTime)
{
// We are at the end of the billing week, so there is nothing to adjust.
activeSubscriptions.Remove(activeSubscription.Subscription.ChannelId);
}
else if (snapshot.Timestamp < billingWeekFinalSnapshotTime)
{
if (snapshot.CreatorChannels.CreatorChannels.All(v => !v.ChannelId.Equals(activeChannelId)))
{
// We are within the billing week, but the channel is no longer published.
// So we stop billing at this point.
activeSubscriptions.Remove(activeSubscription.Subscription.ChannelId);
}
else
{
// We are still within their billing week and the creator still publishes the channel.
// We must extend their subscription to this snapshot.
var newSnapshot = new MergedSnapshot(
snapshot.Timestamp,
snapshot.CreatorChannels,
snapshot.CreatorFreeAccessUsers,
new SubscriberChannelsSnapshot(
snapshot.SubscriberChannels.Timestamp,
snapshot.SubscriberChannels.SubscriberId,
snapshot.SubscriberChannels.SubscribedChannels.Concat(new[] { activeSubscription.Subscription }).ToList()),
snapshot.Subscriber,
snapshot.CalculatedAccountBalance);
snapshots[i] = newSnapshot;
if ((i == snapshots.Count - 1 && activeSubscription.BillingWeekEndDateExclusive < endTimeExclusive) ||
(i < snapshots.Count - 1 && snapshots[i + 1].Timestamp > billingWeekFinalSnapshotTime))
{
// Either this is the last snapshot and the billing week ends before the end date of
// our search range, or the next snapshot will be in the next billing week.
// Either way, we need to insert a snapshot to end the biling at the correct time.
var endSnapshot = new MergedSnapshot(
billingWeekFinalSnapshotTime,
snapshot.CreatorChannels,
snapshot.CreatorFreeAccessUsers,
snapshot.SubscriberChannels,
snapshot.Subscriber,
snapshot.CalculatedAccountBalance);
snapshots.Insert(i + 1, endSnapshot);
}
snapshot = snapshots[i];
}
}
}
}
}
return(snapshots);
}
public void Dispose()
{
ActiveSubscription.Dispose();
}
