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ServerCore/MongoDB/MongoDbConnectorBase.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using MongoDB.Driver;
+
+
+using MONGO_DB_LIST = System.String;
+
+
+namespace ServerCore;
+
+
+public abstract class MongoDbConnectorBase : IDisposable
+{
+    private IMongoClient? m_mongo_client;
+
+    public MongoDbConnectorBase()
+    {
+    }
+
+    public async Task<(bool, List<MONGO_DB_LIST>)> initAndVerifyDb( string connectionString
+                                                                  , int minConnectionPoolSize, int maxConnectionPoolSize
+                                                                  , int waitQueueTimeoutSecs )
+    {
+        var err_msg = string.Empty;
+
+        try
+        {
+            if (true == connectionString.isNullOrWhiteSpace())
+            {
+                throw new ArgumentException("Connection string is null or empty.", nameof(connectionString));
+            }
+
+            if (minConnectionPoolSize < 0 || maxConnectionPoolSize <= 0 || minConnectionPoolSize > maxConnectionPoolSize)
+            {
+                throw new ArgumentOutOfRangeException("Invalid pool size configuration.");
+            }
+
+            if (waitQueueTimeoutSecs < 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(waitQueueTimeoutSecs), "Wait queue timeout must be non-negative.");
+            }
+
+            var settings = MongoClientSettings.FromConnectionString(connectionString);
+            settings.MinConnectionPoolSize = minConnectionPoolSize;
+            settings.MaxConnectionPoolSize = maxConnectionPoolSize;
+            settings.WaitQueueTimeout = TimeSpan.FromSeconds(waitQueueTimeoutSecs);
+
+            var mongo_client = new MongoClient(settings);
+
+            var cursor = await mongo_client.ListDatabaseNamesAsync();
+            var db_list = await cursor.ToListAsync();
+
+            m_mongo_client = mongo_client;
+
+            return (true, db_list);
+        }
+        catch (Exception e)
+        {
+            Log.getLogger().error($"Exception !!!, Failed to perform in MongoDbConnectorBase.initAndVerifyDb() !!! : exception:{e} - connectionString:{connectionString}");
+        }
+
+        return (false, new List<MONGO_DB_LIST>());
+    }
+
+    public IMongoClient getMongoClient()
+    {
+        NullReferenceCheckHelper.throwIfNull(m_mongo_client, () => $"m_mongo_client is null !!!");
+        return m_mongo_client;
+    }
+
+    public void Dispose()
+    {
+        m_mongo_client = null;
+        GC.SuppressFinalize(this);
+    }
+
+    public void disposeMongoDb()
+    {
+        Dispose();
+    }
+}

ServerCore/MongoDB/MongoDbRepository.cs

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+using MongoDB.Driver;
+
+
+namespace ServerBase;
+
+
+public class MongoDbRepository<TCollection> 
+    where TCollection : class
+{
+    protected IMongoCollection<TCollection> m_collection;
+
+    protected MongoDbRepository(IMongoClient client, string database, string collection)
+    {
+        var mongoDb = client.GetDatabase(database);
+        m_collection = mongoDb.GetCollection<TCollection>(collection);
+    }
+
+    public IMongoCollection<TCollection> getCollection() => m_collection;
+}