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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL;
using Tango.BL.Entities;
using Tango.FSE.BL.CacheEntities;
namespace Tango.FSE.BL.Services
{
public class MachineEventsService : FSEServiceBase
{
private const string EVENT_TYPES_COLLECTION = "EventTypes";
private MemoryCacheDictionary<String, CachedEventType> _eventTypesCache;
public MachineEventsService()
{
_eventTypesCache = MemoryCache.GetOrCreateCache<String, CachedEventType>(EVENT_TYPES_COLLECTION);
}
public Task<List<EventType>> GetAllEventTypes()
{
return DataResolver<List<EventType>>.Builder.New()
.ConfigureCascade(DataResolverNode.InMemoryCache, DataResolverNode.Online, DataResolverNode.DiskCache)
.InMemoryCache((context) =>
{
var eventTypes = _eventTypesCache
.ToList()
.Select(x => x.ToObservable())
.ToList();
if (eventTypes.Count == 0)
{
throw new IndexOutOfRangeException("The memory cache did contain any event types.");
}
return eventTypes;
})
.Online((context) =>
{
using (ObservablesContext db = ObservablesContext.CreateDefault())
{
var eventTypes = db.EventTypes.ToList();
List<CachedEventType> cachedEventTypes = new List<CachedEventType>();
try
{
foreach (var eventType in eventTypes)
{
var cachedEventType = CachedEventType.FromObservable<CachedEventType>(eventType);
_eventTypesCache.Put(cachedEventType.Guid, cachedEventType);
}
}
catch (Exception ex)
{
LogManager.Log(ex, "Error caching event types on memory.");
}
try
{
using (var cache = DiskCache.CreateContext())
{
var collection = cache.Database.GetCollection<CachedEventType>(EVENT_TYPES_COLLECTION);
foreach (var cachedEventType in cachedEventTypes)
{
collection.Upsert(cachedEventType);
}
}
}
catch (Exception ex)
{
LogManager.Log(ex, "Error caching event types to disk.");
}
return eventTypes;
}
})
.DiskCache((context) =>
{
using (var cache = DiskCache.CreateContext())
{
var collection = cache.Database.GetCollection<CachedEventType>(EVENT_TYPES_COLLECTION);
var cachedEventTypes = collection.FindAll().ToList();
foreach (var cachedEventType in cachedEventTypes)
{
_eventTypesCache.Put(cachedEventType.Guid, cachedEventType);
}
return cachedEventTypes.Select(x => x.ToObservable()).ToList();
}
})
.BuildExecuteAsync();
}
}
}
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