public Task <(object Snapshot, long Index)> GetSnapshotAsync(string actorName)
{
object snapshot = null;
long index = 0;
try
{
using (var db = new SqlitePersistenceContext(_datasource))
{
var item = db.Snapshots
.Where(x => x.ActorName == actorName)
.OrderByDescending(x => x.SnapshotIndex)
.FirstOrDefault();
if (item != null)
{
snapshot = JsonConvert.DeserializeObject <object>(item.SnapshotData, new JsonSerializerSettings {
TypeNameHandling = TypeNameHandling.Auto
});
index = item.SnapshotIndex;
}
}
}
catch (Exception ex)
{
throw ex;
}
return(Task.FromResult((snapshot, index)));
}
public Task GetEventsAsync(string actorName, long indexStart, Action <object> callback)
{
try
{
using (var db = new SqlitePersistenceContext(_datasource))
{
var items = db.Events
.Where(x => x.ActorName == actorName)
.Where(x => x.EventIndex >= indexStart)
.ToList();
foreach (var item in items)
{
callback(JsonConvert.DeserializeObject <object>(item.EventData, new JsonSerializerSettings {
TypeNameHandling = TypeNameHandling.Auto
}));
}
}
}
catch (Exception ex)
{
throw ex;
}
return(Task.FromResult(0));
}
public SqliteProvider(string datasource = "states.db")
{
_datasource = datasource;
try
{
using (var db = new SqlitePersistenceContext(_datasource))
{
db.Database.EnsureCreated();
}
}
catch (Exception ex)
{
throw ex;
}
}
public IProviderState GetState()
{
try
{
using (var db = new SqlitePersistenceContext(_datasource))
{
db.Database.EnsureCreated();
}
}
catch (Exception ex)
{
throw ex;
}
return(new SqliteProviderState(_datasource));
}
public async Task PersistSnapshotAsync(string actorName, long index, object snapshot)
{
try
{
using (var db = new SqlitePersistenceContext(_datasource))
{
var item = new Snapshot(actorName, index, JsonConvert.SerializeObject(snapshot, new JsonSerializerSettings {
TypeNameHandling = TypeNameHandling.All
}));
await db.Snapshots.AddAsync(item);
await db.SaveChangesAsync();
}
}
catch (Exception ex)
{
throw ex;
}
}
public async Task DeleteSnapshotsAsync(string actorName, long inclusiveToIndex)
{
try
{
using (var db = new SqlitePersistenceContext(_datasource))
{
var items = db.Snapshots
.Where(x => x.ActorName == actorName)
.Where(x => x.SnapshotIndex <= inclusiveToIndex)
.ToList();
db.RemoveRange(items);
await db.SaveChangesAsync();
}
}
catch (Exception ex)
{
throw ex;
}
}