public async Task AddLikeAsync(string space, string itemId, string userId)
{
if (string.IsNullOrEmpty(itemId))
{
throw new ArgumentNullException("itemId");
}
if (string.IsNullOrEmpty(userId))
{
throw new ArgumentNullException("userId");
}
// Writing to all required key families
const SignalType signal = SignalType.Like;
DateTime dateTime = DateTime.UtcNow;
var tasks = new List <Task>();
// 1. Item and user relations
// Building composite row key to isolated different spaces of statistics
string itemRowKey = BuildGlobalId(space, itemId);
string userRowKey = BuildGlobalId(space, userId);
// Item cumulative counts
tasks.Add(_itemCountsRepository.IncLikesAsync(itemRowKey));
// User cumulative counts
tasks.Add(_userCountsRepository.IncLikesAsync(userRowKey));
// User likes
tasks.Add(Task.Run(() =>
{
var addTasks = new List <Task>();
var userSignal = new UserSignalsInsertDeleteOptions {
ItemId = itemId, UserId = userRowKey, DateTime = dateTime, Signal = signal
};
addTasks.Add(_userSignalsRepository.AddAsync(userSignal));
addTasks.Add(_userSignalsUnorderedRepository.AddAsync(userSignal));
return(Task.WhenAll(addTasks));
}));
// Users who liked an item
tasks.Add(_itemSignalsRepository.AddAsync(new ItemSignalsInsertDeleteOptions {
ItemId = itemRowKey, UserId = userId, DateTime = dateTime, Signal = signal
}));
// 2. Affinity groups
IEnumerable <string> affinityGroups = BuildAffinityGroups(dateTime);
foreach (string affinityGroup in affinityGroups)
{
// Building composite row keys to isolated different spaces of statistics
string groupId = BuildGlobalId(space, affinityGroup);
// Affinity group most liked
tasks.Add(Task.Run(async() =>
{
// getting current version of most signaled items
AffinityGroupMostSignaledVersionEntity currentVersion = await _affinityGroupMostSignaledVersionRepository.GetAsync(groupId, signal);
// getting item counts
IEnumerable <AffinityGroupItemCountsEntity> itemCounts = await _affinityGroupItemCountsRepository.GetSequenceAsync(groupId, signal, 1000);
// building new version of most liked
Dictionary <string, AffinityGroupItemCountsEntity> itemCountsDict = itemCounts.ToDictionary(i => i.ItemId);
var insertOptions = new List <AffinityGroupMostSignaledInsertOptions>();
foreach (var i in itemCountsDict)
{
var insertItem = new AffinityGroupMostSignaledInsertOptions {
ItemId = i.Key, Count = i.Value.Count
};
if (insertItem.ItemId == itemId)
{
insertItem.Count = insertItem.Count + 1;
}
insertOptions.Add(insertItem);
}
// ensuring current item
if (!itemCountsDict.ContainsKey(itemId))
{
insertOptions.Add(new AffinityGroupMostSignaledInsertOptions {
ItemId = itemId, Count = 1
});
}
await _affinityGroupMostSignaledRepository.AddAsync(groupId, signal, currentVersion.Version + 1, insertOptions);
// incrementing counter of itemId
await _affinityGroupItemCountsRepository.IncAsync(groupId, signal, itemId);
// incrementing version
await _affinityGroupMostSignaledVersionRepository.UpdateAsync(groupId, signal, currentVersion.Version + 1);
}));
// incrementing affinity group cumulative counts
tasks.Add(_affinityGroupCountsRepository.IncAsync(groupId, signal));
}
// 3. Time series
string eventId = BuildTimeSeriesRowKey(itemRowKey, signal);
// Rollups
var rollupOptions = new TimeSeriesRollupsInsertOptions
{
EventId = eventId,
DateTime = dateTime
};
// Rollups for days
tasks.Add(_timeSeriesRollupsDayRepository.IncAsync(rollupOptions));
// Rollups for hour
tasks.Add(_timeSeriesRollupsHourRepository.IncAsync(rollupOptions));
// Rollups for minute
tasks.Add(_timeSeriesRollupsMinuteRepository.IncAsync(rollupOptions));
await Task.WhenAll(tasks);
}