internal static MongoDbToDirectoryExporter Create(IMongoDatabase mongoDb,
IExportImportPathInfoProvider pathInfoProvider,
ISimmpleProgressReporter progressReporter = null) =>
new MongoDbToDirectoryExporter
{
MongoDb = mongoDb,
PathInfo = pathInfoProvider,
ProgressReporter = progressReporter
};
public static void loadFromDbThenSerializeToJsonThenSaveToDir(IMongoDatabase db,
IExportImportPathInfoProvider pathInfo, string collectionNamePrefix,
ISimmpleProgressReporter progressReporter, CodeApproachType codeApproach = CodeApproachType.AsyncFunctional)
{
if (db == null)
{
return;
}
var dirName = $@"{pathInfo.RootPath}\{pathInfo.WorkingDirName} {collectionNamePrefix}";
progressReporter?.Start($"Start exporting data from {db.DatabaseNamespace.DatabaseName} to {dirName}");
Directory.CreateDirectory(dirName);
progressReporter?.Report($"{dirName} was created");
var filter = Builders <BsonDocument> .Filter.Regex("name", $"^{collectionNamePrefix}");
var localFunctions = new Dictionary <CodeApproachType, Action>()
{
{ CodeApproachType.AsyncFunctional, doItAsync },
{ CodeApproachType.SyncFunctional, doItSync },
{ CodeApproachType.SyncNotFunctional, doItSyncAndNotFuncional }
};
localFunctions[codeApproach].Invoke();
progressReporter?.End("Export complete");
#region Local functions
IMongoCollection <BsonDocument> getCollectionByName(string name) => db.GetCollection <BsonDocument>(name);
void reportProgressAndSaveSyncFunc(Tuple <string, IEnumerable <string> > tuple)
{
progressReporter?.Report($"Saving {tuple.Item1}");
saveSyncFunc(tuple.Item1, tuple.Item2);
progressReporter?.Report($"Complete {tuple.Item1}");
}
void saveSyncFunc(string fileName, IEnumerable <string> linesToWrite)
{
using (var streamWriter = new StreamWriter($"{dirName}/{fileName}.{pathInfo.FileExtension}"))
linesToWrite
.ToList()
.ForEach(line => streamWriter.WriteLine(line));
}
void doItAsync() =>
db.ListCollectionNames(new ListCollectionNamesOptions {
Filter = filter
})
.ToEnumerable()
.AsParallel()
.Select(getCollectionByName)
.Select(col => Tuple.Create(col.CollectionNamespace.CollectionName, serializeCollectionParallel(col)))
.ForAll(reportProgressAndSaveSyncFunc);
void doItSync() =>
db.ListCollectionNames(new ListCollectionNamesOptions {
Filter = filter
})
.ToEnumerable()
.Select(getCollectionByName)
.Select(col => Tuple.Create(col.CollectionNamespace.CollectionName, serializeCollection(col)))
.ToList()
.ForEach(reportProgressAndSaveSyncFunc);
void doItSyncAndNotFuncional()
{
using (IAsyncCursor <string> cursor = db.ListCollectionNames(new ListCollectionNamesOptions {
Filter = filter
})) {
while (cursor.MoveNext())
{
foreach (var collectionName in cursor.Current)
{
var collection = getCollectionByName(collectionName);
var colName = collection.CollectionNamespace.CollectionName;
progressReporter?.Report($"Saving {colName}");
using (var fluentCursor = collection.Find(new BsonDocument()).ToCursor())
while (fluentCursor.MoveNext())
{
foreach (var document in fluentCursor.Current)
{
using (var streamWriter = new StreamWriter($"{dirName}/{colName}.{pathInfo.FileExtension}"))
using (var stringWriter = new StringWriter())
using (var jsonWriter = new JsonWriter(stringWriter)) {
var serializationContext = BsonSerializationContext.CreateRoot(jsonWriter);
collection.DocumentSerializer.Serialize(serializationContext, document);
var serializedLine = stringWriter.ToString();
streamWriter.WriteLine(serializedLine);
}
}
}
progressReporter?.Report($"Complete");
}
}
}
}
#endregion
}
public static void loadFromDirThenDeserializeFromJsonThenSaveToDb(IMongoDatabase db, IExportImportPathInfoProvider pathInfoProvider,
ISimmpleProgressReporter progressReporter = null, CodeApproachType codeApproach = CodeApproachType.AsyncFunctional)
{
var dirPath = $@"{pathInfoProvider.RootPath}\{pathInfoProvider.WorkingDirName}";
if (Directory.Exists(dirPath) && db != null)
{
var localFunctions = new Dictionary <CodeApproachType, Action>()
{
{ CodeApproachType.AsyncFunctional, doItAsync },
{ CodeApproachType.SyncFunctional, doItSync },
{ CodeApproachType.SyncNotFunctional, doItSyncAndNotFuncional }
};
progressReporter?.Start($"Start importing data from {dirPath} to {db.DatabaseNamespace.DatabaseName}");
localFunctions[codeApproach].Invoke();
progressReporter?.End($"All data from {dirPath} was loaded successfully");
}
#region Local functions
void doItAsync() =>
Directory.EnumerateFiles(dirPath, $"*.{pathInfoProvider.FileExtension}", SearchOption.TopDirectoryOnly)
.AsParallel()
.Select(fullPath => new {
Name = Path.GetFileNameWithoutExtension(fullPath),
Lines = readLinesFromFile(fullPath)
})
.Select(file => new {
Collection = dropThenCreateCollection(db, file.Name),
Documents = file.Lines.Select(deserializeFunc)
})
.ForAll(async deserialized => {
var name = deserialized.Collection.CollectionNamespace.CollectionName;
progressReporter?.Report($"Loading {name}");
await deserialized.Collection.InsertManyAsync(deserialized.Documents);
progressReporter?.Report($"Complete {name}");
});
void doItSync() =>
Directory.EnumerateFiles(dirPath, $"*.{pathInfoProvider.FileExtension}", SearchOption.TopDirectoryOnly)
.Select(fullPath => new {
Name = Path.GetFileNameWithoutExtension(fullPath),
Lines = readLinesFromFile(fullPath)
})
.Select(file => new {
Collection = dropThenCreateCollection(db, file.Name),
Documents = file.Lines.Select(deserializeFunc)
})
.ToList()
.ForEach(deserialized => {
var name = deserialized.Collection.CollectionNamespace.CollectionName;
progressReporter?.Report($"Loading {name}");
deserialized.Collection.InsertMany(deserialized.Documents);
progressReporter?.Report($"Complete {name}");
});
void doItSyncAndNotFuncional()
{
foreach (var fullPath in Directory.EnumerateFiles(dirPath, $"*.{pathInfoProvider.FileExtension}", SearchOption.TopDirectoryOnly))
{
var collectionName = Path.GetFileNameWithoutExtension(fullPath);
var collection = dropThenCreateCollection(db, collectionName);
progressReporter?.Report($"Loading {collectionName}");
using (var streamReader = new StreamReader(fullPath)) {
string line;
while ((line = streamReader.ReadLine()) != null)
{
var document = BsonSerializer.Deserialize <BsonDocument>(line);
collection.InsertOne(document);
}
}
progressReporter?.Report($"Complete {collectionName}");
}
}
BsonDocument deserializeFunc(string line) => BsonSerializer.Deserialize <BsonDocument>(line);
#endregion
}
