public static IEnumerable <MongoCursor <TType> > Split <TType>(this MongoDbCollection collection,
IMongoQuery query,
int splits, Action <MongoCursor <TType> > initializer = null, double sampleStart = 0,
double sampleEnd = 1)
{
var sampler = new MongoIdSampler();
var width = (sampleEnd - sampleStart) / splits;
for (var i = 0; i < splits; i++)
{
var q = query ?? new QueryDocument();
var start = sampleStart + i * width;
var end = sampleStart + (i + 1) * width;
if (start > 0 || end < 1)
{
q = Query.And(sampler.GetIdRange(start, end), q);
}
var cursor = collection.FindAs <TType>(q);
if (initializer != null)
{
initializer(cursor);
}
yield return(cursor);
}
}
public async Task AddItemAsync <T>(MongoDbCollection collectionName, T item) where T : DomainBase
{
if (string.IsNullOrWhiteSpace(item.Id))
{
item.Id = Guid.NewGuid().ToString();
}
var collection = database.GetCollection <T>(collectionName.ToString());
await collection.InsertOneAsync(item);
}
public async Task UpdateItemAsync(MongoDbCollection collectionName, BsonDocument filter, BsonDocument updatedFields, bool isManyUpdate = false)
{
var collection = database.GetCollection <BsonDocument>(collectionName.ToString());
if (isManyUpdate)
{
await collection.UpdateManyAsync(filter, updatedFields);
}
else
{
await collection.UpdateOneAsync(filter, updatedFields);
}
}
public async Task DeleteAsync(MongoDbCollection collectionName, BsonDocument filter, bool isManyDelete = false)
{
var collection = database.GetCollection <BsonDocument>(collectionName.ToString());
if (isManyDelete)
{
await collection.DeleteManyAsync(filter);
}
else
{
await collection.DeleteOneAsync(filter);
}
}
public async Task <IEnumerable <Hashtable> > GetItemsAsync(MongoDbCollection collectionName, BsonDocument filter, string[] fields = null)
{
var collection = database.GetCollection <BsonDocument>(collectionName.ToString());
var cursor = collection.Find(filter);
List <BsonDocument> result;
if (fields != null && fields.Any())
{
var projections = fields.Select(field => Builders <BsonDocument> .Projection.Include(field)).ToList();
var combinedProjections = Builders <BsonDocument> .Projection.Combine(projections);
result = await cursor.Project(combinedProjections).ToListAsync();
}
else
{
result = await cursor.ToListAsync();
}
return(result.Select(e => e.ToHashtable()));
}
public MongoDbDataSource(MongoDbCollection collection, int threads = 2)
{
_collection = collection;
DeserializationThreads = threads;
}
