From 81720c154233bd6da177518357fa3a2856858dbd Mon Sep 17 00:00:00 2001
From: powerumc <powerumc@gmail.com>
Date: Tue, 4 Jun 2019 12:17:59 +0900
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cremaconsole.exe 에서 사용하는 내장 함수 `login` 경우 모든 데이터베이스의 메타데이터를 반환하
기 때문에 데이터베이스, 테이블, 타입의 개수가 많은 경우 성능을 저하시킨다.
따라서 원하는 데이터베이스의 메타데이터만 반환하는 API 추가함

추가된 API 목록
- cremaconsole.exe `loginDataBase` 함수
- DataBaseCollectionService.SubscribeDataBase API

기존 대비 성능 개선 효과
- 성능: 3.5s -> 0.4s 로 단축됨
- 데이터 트래픽: 기존 70203188 Bytes -> 2004556 Bytes
---
 .../Methods/LoginDataBaseMethod.cs            |  47 ++++++
 .../Ntreev.Crema.Javascript.csproj            |   1 +
 .../ScriptMethodContext.cs                    |  11 ++
 client/Ntreev.Crema.Services/CremaHost.cs     |  82 +++++++----
 .../Data/DataBaseCollection.cs                |  13 +-
 .../DataBaseCollectionService/Reference.cs    |   7 +
 .../configuration.svcinfo                     |   2 +-
 .../configuration91.svcinfo                   |   6 +-
 .../DataBaseCollectionService/service.wsdl    |   9 ++
 .../www.ntreev.com.wsdl                       |  10 ++
 .../www.ntreev.com.xsd                        | 135 ++++++++++--------
 .../ICremaHost.cs                             |   1 +
 .../Data/DataBaseCollectionService.cs         |  34 +++++
 .../Data/IDataBaseCollectionService.cs        |   3 +
 14 files changed, 270 insertions(+), 91 deletions(-)
 create mode 100644 client/Ntreev.Crema.Javascript/Methods/LoginDataBaseMethod.cs

diff --git a/client/Ntreev.Crema.Javascript/Methods/LoginDataBaseMethod.cs b/client/Ntreev.Crema.Javascript/Methods/LoginDataBaseMethod.cs
new file mode 100644
index 000000000..f0246f596
--- /dev/null
+++ b/client/Ntreev.Crema.Javascript/Methods/LoginDataBaseMethod.cs
@@ -0,0 +1,47 @@
+//Released under the MIT License.
+//
+//Copyright (c) 2018 Ntreev Soft co., Ltd.
+//
+//Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated 
+//documentation files (the "Software"), to deal in the Software without restriction, including without limitation the 
+//rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit 
+//persons to whom the Software is furnished to do so, subject to the following conditions:
+//
+//The above copyright notice and this permission notice shall be included in all copies or substantial portions of the 
+//Software.
+//
+//THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE 
+//WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR 
+//COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
+//OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+using Ntreev.Crema.Services;
+using Ntreev.Library;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Ntreev.Crema.Javascript.Methods
+{
+    [Export(typeof(IScriptMethod))]
+    [PartCreationPolicy(CreationPolicy.NonShared)]
+    class LoginDataBaseMethod : ScriptMethodBase
+    {
+        protected override Delegate CreateDelegate()
+        {
+            return new Func<string, string, string, string, string>(this.LoginDataBase);
+        }
+
+        private string LoginDataBase(string address, string dataBaseName, string userID, string password)
+        {
+            if (this.Context is ScriptMethodContext context)
+            {
+                return context.Login(address, dataBaseName, userID, password);
+            }
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/client/Ntreev.Crema.Javascript/Ntreev.Crema.Javascript.csproj b/client/Ntreev.Crema.Javascript/Ntreev.Crema.Javascript.csproj
index 9c793ff56..0f983a540 100644
--- a/client/Ntreev.Crema.Javascript/Ntreev.Crema.Javascript.csproj
+++ b/client/Ntreev.Crema.Javascript/Ntreev.Crema.Javascript.csproj
@@ -52,6 +52,7 @@
     <Compile Include="Authenticator.cs" />
     <None Include="Consoles\RunFileCommand.cs" />
     <Compile Include="Consoles\RunCommand.cs" />
+    <Compile Include="Methods\LoginDataBaseMethod.cs" />
     <Compile Include="Methods\LoginMethod.cs" />
     <Compile Include="Methods\LogoutMethod.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
diff --git a/client/Ntreev.Crema.Javascript/ScriptMethodContext.cs b/client/Ntreev.Crema.Javascript/ScriptMethodContext.cs
index d5ac7195e..1ea7e9e29 100644
--- a/client/Ntreev.Crema.Javascript/ScriptMethodContext.cs
+++ b/client/Ntreev.Crema.Javascript/ScriptMethodContext.cs
@@ -54,6 +54,17 @@ public string Login(string address, string userID, string password)
             return this.token;
         }
 
+        public string Login(string address, string dataBase, string userID, string password)
+        {
+            if (this.token != null)
+                throw new ArgumentException("이미 로그인되어 있습니다.");
+            var token = this.cremaHost.Dispatcher.Invoke(() => this.cremaHost.Open(address, dataBase, userID, StringUtility.ToSecureString(password)));
+            var authenticator = this.cremaHost.GetService(typeof(Authenticator)) as Authenticator;
+            this.Initialize(authenticator);
+            this.token = $"{token}";
+            return this.token;
+        }
+
         public void Logout(string token)
         {
             if (token == null)
diff --git a/client/Ntreev.Crema.Services/CremaHost.cs b/client/Ntreev.Crema.Services/CremaHost.cs
index 87910a811..347bdbb53 100644
--- a/client/Ntreev.Crema.Services/CremaHost.cs
+++ b/client/Ntreev.Crema.Services/CremaHost.cs
@@ -155,31 +155,7 @@ public Guid Open(string address, string userID, SecureString password)
             {
                 try
                 {
-                    this.address = AddressUtility.GetDisplayAddress(address);
-                    this.log = new LogService(this.address.Replace(':', '_'), userID, AppUtility.UserAppDataPath);
-                    this.log.Verbose = this.verbose;
-                    this.userContext = new UserContext(this, this.ipAddress, serviceInfos[nameof(UserService)], userID, password);
-                    var user = this.userContext.Users[userID];
-                    user.SetUserState(UserState.Online);
-                    this.userID = userID;
-                    this.authority = user.Authority;
-
-                    this.dataBases = new DataBaseCollection(this, this.ipAddress, serviceInfos[nameof(DataBaseCollectionService)]);
-                    this.domainContext = new DomainContext(this, this.ipAddress, serviceInfos[nameof(DomainService)]);
-                    this.isConnected = true;
-                    this.configs = new CremaConfiguration(this.ConfigPath);
-                    this.plugins = this.container.GetService(typeof(IEnumerable<IPlugin>)) as IEnumerable<IPlugin>;
-                    foreach (var item in this.plugins)
-                    {
-                        var authentication = new Authentication(new AuthenticationProvider(user), item.ID);
-                        this.authentications.Add(authentication);
-                        item.Initialize(authentication);
-                    }
-
-                    this.OnOpened(EventArgs.Empty);
-                    this.token = Guid.NewGuid();
-                    CremaLog.Info($"Crema opened : {address} {userID}");
-                    return token;
+                    return OpenInternal(address, null, userID, password);
                 }
                 catch
                 {
@@ -193,6 +169,62 @@ public Guid Open(string address, string userID, SecureString password)
             });
         }
 
+        public Guid Open(string address, string dataBase, string userID, SecureString password)
+        {
+            if (this.isConnected == true)
+                throw new InvalidOperationException(Resources.Exception_AlreadyConnected);
+
+            this.ipAddress = AddressUtility.GetIPAddress(address);
+            this.serviceInfos = GetServiceInfo(address).ToDictionary(item => item.Name);
+
+            this.OnOpening(EventArgs.Empty);
+            return this.dispatcher.Invoke(() =>
+            {
+                try
+                {
+                    return OpenInternal(address, dataBase, userID, password);
+                }
+                catch
+                {
+                    this.userContext?.Close(CloseInfo.Empty);
+                    this.userContext = null;
+                    this.log?.Dispose();
+                    this.log = null;
+                    this.address = null;
+                    throw;
+                }
+            });
+        }
+
+        private Guid OpenInternal(string address, string dataBase, string userID, SecureString password)
+        {
+            this.address = AddressUtility.GetDisplayAddress(address);
+            this.log = new LogService(this.address.Replace(':', '_'), userID, AppUtility.UserAppDataPath);
+            this.log.Verbose = this.verbose;
+            this.userContext = new UserContext(this, this.ipAddress, serviceInfos[nameof(UserService)], userID, password);
+            var user = this.userContext.Users[userID];
+            user.SetUserState(UserState.Online);
+            this.userID = userID;
+            this.authority = user.Authority;
+
+            this.dataBases = new DataBaseCollection(this, this.ipAddress, dataBase, serviceInfos[nameof(DataBaseCollectionService)]);
+            this.domainContext = new DomainContext(this, this.ipAddress, serviceInfos[nameof(DomainService)]);
+            this.isConnected = true;
+            this.configs = new CremaConfiguration(this.ConfigPath);
+            this.plugins = this.container.GetService(typeof(IEnumerable<IPlugin>)) as IEnumerable<IPlugin>;
+            foreach (var item in this.plugins)
+            {
+                var authentication = new Authentication(new AuthenticationProvider(user), item.ID);
+                this.authentications.Add(authentication);
+                item.Initialize(authentication);
+            }
+
+            this.OnOpened(EventArgs.Empty);
+            this.token = Guid.NewGuid();
+            CremaLog.Info($"Crema opened : {address} {userID}");
+            return token;
+        }
+
         public void SaveConfigs()
         {
             this.configs.Commit();
diff --git a/client/Ntreev.Crema.Services/Data/DataBaseCollection.cs b/client/Ntreev.Crema.Services/Data/DataBaseCollection.cs
index 8e0a5626d..12a56cf0c 100644
--- a/client/Ntreev.Crema.Services/Data/DataBaseCollection.cs
+++ b/client/Ntreev.Crema.Services/Data/DataBaseCollection.cs
@@ -22,12 +22,14 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.ServiceModel;
 using System.Text;
 using System.Threading.Tasks;
 using Ntreev.Library;
 using System.Timers;
+using Ntreev.Library.Serialization;
 
 namespace Ntreev.Crema.Services.Data
 {
@@ -54,7 +56,7 @@ class DataBaseCollection : ContainerBase<DataBase>, IDataBaseCollection, IDataBa
         private ItemsEventHandler<IDataBase> itemsAccessChanged;
         private ItemsEventHandler<IDataBase> itemsLockChanged;
 
-        public DataBaseCollection(CremaHost cremaHost, string address, ServiceInfo serviceInfo)
+        public DataBaseCollection(CremaHost cremaHost, string address, string dataBase, ServiceInfo serviceInfo)
         {
             this.cremaHost = cremaHost;
             this.userContext = cremaHost.UserContext;
@@ -68,8 +70,15 @@ public DataBaseCollection(CremaHost cremaHost, string address, ServiceInfo servi
                 {
                     service.Faulted += Service_Faulted;
                 }
-                var result = this.service.Subscribe(cremaHost.AuthenticationToken);
+
+                ResultBase<DataBaseCollectionMetaData> result;
+                result = dataBase == null
+                    ? this.service.Subscribe(cremaHost.AuthenticationToken)
+                    : this.service.SubscribeDataBase(cremaHost.AuthenticationToken, dataBase);
                 result.Validate();
+
+                XmlSerializerUtility.Write("./a.xml", result);
+
 #if !DEBUG
                 this.timer = new Timer(30000);
                 this.timer.Elapsed += Timer_Elapsed;
diff --git a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/Reference.cs b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/Reference.cs
index 1ffa29152..a390be182 100644
--- a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/Reference.cs	
+++ b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/Reference.cs	
@@ -21,6 +21,9 @@ internal interface IDataBaseCollectionService {
         [System.ServiceModel.OperationContractAttribute(Action="http://www.ntreev.com/IDataBaseCollectionService/Subscribe", ReplyAction="http://www.ntreev.com/IDataBaseCollectionService/SubscribeResponse")]
         Ntreev.Crema.ServiceModel.ResultBase<Ntreev.Crema.ServiceModel.DataBaseCollectionMetaData> Subscribe(System.Guid authenticationToken);
         
+        [System.ServiceModel.OperationContractAttribute(Action="http://www.ntreev.com/IDataBaseCollectionService/SubscribeDataBase", ReplyAction="http://www.ntreev.com/IDataBaseCollectionService/SubscribeDataBaseResponse")]
+        Ntreev.Crema.ServiceModel.ResultBase<Ntreev.Crema.ServiceModel.DataBaseCollectionMetaData> SubscribeDataBase(System.Guid authenticationToken, string dataBase);
+        
         [System.ServiceModel.OperationContractAttribute(Action="http://www.ntreev.com/IDataBaseCollectionService/Unsubscribe", ReplyAction="http://www.ntreev.com/IDataBaseCollectionService/UnsubscribeResponse")]
         Ntreev.Crema.ServiceModel.ResultBase Unsubscribe();
         
@@ -165,6 +168,10 @@ public Ntreev.Crema.ServiceModel.ResultBase DefinitionType(Ntreev.Crema.ServiceM
             return base.Channel.Subscribe(authenticationToken);
         }
         
+        public Ntreev.Crema.ServiceModel.ResultBase<Ntreev.Crema.ServiceModel.DataBaseCollectionMetaData> SubscribeDataBase(System.Guid authenticationToken, string dataBase) {
+            return base.Channel.SubscribeDataBase(authenticationToken, dataBase);
+        }
+        
         public Ntreev.Crema.ServiceModel.ResultBase Unsubscribe() {
             return base.Channel.Unsubscribe();
         }
diff --git a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/configuration.svcinfo b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/configuration.svcinfo
index e63cee694..1d2623038 100644
--- a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/configuration.svcinfo	
+++ b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/configuration.svcinfo	
@@ -2,7 +2,7 @@
 <configurationSnapshot xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="urn:schemas-microsoft-com:xml-wcfconfigurationsnapshot">
   <behaviors />
   <bindings>
-    <binding digest="System.ServiceModel.Configuration.NetTcpBindingElement, System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089:&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-16&quot;?&gt;&lt;Data name=&quot;NetTcpBinding_IDataBaseCollectionService&quot;&gt;&lt;security mode=&quot;None&quot; /&gt;&lt;/Data&gt;" bindingType="netTcpBinding" name="NetTcpBinding_IDataBaseCollectionService" />
+    <binding digest="System.ServiceModel.Configuration.NetTcpBindingElement, System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089:&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-16&quot;?&gt;&lt;Data name=&quot;NetTcpBinding_IDataBaseCollectionService&quot;&gt;&lt;security mode=&quot;None&quot;&gt;&lt;transport sslProtocols=&quot;None&quot; /&gt;&lt;/security&gt;&lt;/Data&gt;" bindingType="netTcpBinding" name="NetTcpBinding_IDataBaseCollectionService" />
   </bindings>
   <endpoints>
     <endpoint normalizedDigest="&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-16&quot;?&gt;&lt;Data address=&quot;net.tcp://localhost:4004/DataBaseCollectionService&quot; binding=&quot;netTcpBinding&quot; bindingConfiguration=&quot;NetTcpBinding_IDataBaseCollectionService&quot; contract=&quot;DataBaseCollectionService.IDataBaseCollectionService&quot; name=&quot;NetTcpBinding_IDataBaseCollectionService&quot; /&gt;" digest="&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-16&quot;?&gt;&lt;Data address=&quot;net.tcp://localhost:4004/DataBaseCollectionService&quot; binding=&quot;netTcpBinding&quot; bindingConfiguration=&quot;NetTcpBinding_IDataBaseCollectionService&quot; contract=&quot;DataBaseCollectionService.IDataBaseCollectionService&quot; name=&quot;NetTcpBinding_IDataBaseCollectionService&quot; /&gt;" contractName="DataBaseCollectionService.IDataBaseCollectionService" name="NetTcpBinding_IDataBaseCollectionService" />
diff --git a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/configuration91.svcinfo b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/configuration91.svcinfo
index ba17a6676..28fe19aea 100644
--- a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/configuration91.svcinfo	
+++ b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/configuration91.svcinfo	
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<SavedWcfConfigurationInformation xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Version="9.1" CheckSum="bU0rByQfi/L+kuiMh/z/IOFVaX0=">
+<SavedWcfConfigurationInformation xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" Version="9.1" CheckSum="XhWk4dWk1jFrXpNy8g9upoz7Dp8=">
   <bindingConfigurations>
     <bindingConfiguration bindingType="netTcpBinding" name="NetTcpBinding_IDataBaseCollectionService">
       <properties>
@@ -105,8 +105,8 @@
         <property path="/security/transport/extendedProtectionPolicy/customServiceNames" isComplexType="true" isExplicitlyDefined="false" clrType="System.Security.Authentication.ExtendedProtection.Configuration.ServiceNameElementCollection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
           <serializedValue>(컬렉션)</serializedValue>
         </property>
-        <property path="/security/transport/sslProtocols" isComplexType="false" isExplicitlyDefined="false" clrType="System.Security.Authentication.SslProtocols, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
-          <serializedValue>Tls, Tls11, Tls12</serializedValue>
+        <property path="/security/transport/sslProtocols" isComplexType="false" isExplicitlyDefined="true" clrType="System.Security.Authentication.SslProtocols, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
+          <serializedValue>None</serializedValue>
         </property>
         <property path="/security/message" isComplexType="true" isExplicitlyDefined="false" clrType="System.ServiceModel.Configuration.MessageSecurityOverTcpElement, System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
           <serializedValue>System.ServiceModel.Configuration.MessageSecurityOverTcpElement</serializedValue>
diff --git a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/service.wsdl b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/service.wsdl
index ecb36172c..de3d1af30 100644
--- a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/service.wsdl	
+++ b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/service.wsdl	
@@ -34,6 +34,15 @@
         <soap12:body use="literal" />
       </wsdl:output>
     </wsdl:operation>
+    <wsdl:operation name="SubscribeDataBase">
+      <soap12:operation soapAction="http://www.ntreev.com/IDataBaseCollectionService/SubscribeDataBase" style="document" />
+      <wsdl:input>
+        <soap12:body use="literal" />
+      </wsdl:input>
+      <wsdl:output>
+        <soap12:body use="literal" />
+      </wsdl:output>
+    </wsdl:operation>
     <wsdl:operation name="Unsubscribe">
       <soap12:operation soapAction="http://www.ntreev.com/IDataBaseCollectionService/Unsubscribe" style="document" />
       <wsdl:input>
diff --git a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/www.ntreev.com.wsdl b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/www.ntreev.com.wsdl
index 0bdec169b..0a5735edd 100644
--- a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/www.ntreev.com.wsdl	
+++ b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/www.ntreev.com.wsdl	
@@ -20,6 +20,12 @@
   <wsdl:message name="IDataBaseCollectionService_Subscribe_OutputMessage">
     <wsdl:part name="parameters" element="tns:SubscribeResponse" />
   </wsdl:message>
+  <wsdl:message name="IDataBaseCollectionService_SubscribeDataBase_InputMessage">
+    <wsdl:part name="parameters" element="tns:SubscribeDataBase" />
+  </wsdl:message>
+  <wsdl:message name="IDataBaseCollectionService_SubscribeDataBase_OutputMessage">
+    <wsdl:part name="parameters" element="tns:SubscribeDataBaseResponse" />
+  </wsdl:message>
   <wsdl:message name="IDataBaseCollectionService_Unsubscribe_InputMessage">
     <wsdl:part name="parameters" element="tns:Unsubscribe" />
   </wsdl:message>
@@ -191,6 +197,10 @@
       <wsdl:input wsaw:Action="http://www.ntreev.com/IDataBaseCollectionService/Subscribe" message="tns:IDataBaseCollectionService_Subscribe_InputMessage" />
       <wsdl:output wsaw:Action="http://www.ntreev.com/IDataBaseCollectionService/SubscribeResponse" message="tns:IDataBaseCollectionService_Subscribe_OutputMessage" />
     </wsdl:operation>
+    <wsdl:operation msc:isInitiating="true" msc:isTerminating="false" name="SubscribeDataBase">
+      <wsdl:input wsaw:Action="http://www.ntreev.com/IDataBaseCollectionService/SubscribeDataBase" message="tns:IDataBaseCollectionService_SubscribeDataBase_InputMessage" />
+      <wsdl:output wsaw:Action="http://www.ntreev.com/IDataBaseCollectionService/SubscribeDataBaseResponse" message="tns:IDataBaseCollectionService_SubscribeDataBase_OutputMessage" />
+    </wsdl:operation>
     <wsdl:operation msc:isInitiating="true" msc:isTerminating="false" name="Unsubscribe">
       <wsdl:input wsaw:Action="http://www.ntreev.com/IDataBaseCollectionService/Unsubscribe" message="tns:IDataBaseCollectionService_Unsubscribe_InputMessage" />
       <wsdl:output wsaw:Action="http://www.ntreev.com/IDataBaseCollectionService/UnsubscribeResponse" message="tns:IDataBaseCollectionService_Unsubscribe_OutputMessage" />
diff --git a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/www.ntreev.com.xsd b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/www.ntreev.com.xsd
index 27985bc6f..5a9af28cb 100644
--- a/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/www.ntreev.com.xsd	
+++ b/client/Ntreev.Crema.Services/Service References/DataBaseCollectionService/www.ntreev.com.xsd	
@@ -31,6 +31,21 @@
       </xs:sequence>
     </xs:complexType>
   </xs:element>
+  <xs:element name="SubscribeDataBase">
+    <xs:complexType>
+      <xs:sequence>
+        <xs:element xmlns:q5="http://schemas.microsoft.com/2003/10/Serialization/" minOccurs="0" name="authenticationToken" type="q5:guid" />
+        <xs:element minOccurs="0" name="dataBase" nillable="true" type="xs:string" />
+      </xs:sequence>
+    </xs:complexType>
+  </xs:element>
+  <xs:element name="SubscribeDataBaseResponse">
+    <xs:complexType>
+      <xs:sequence>
+        <xs:element xmlns:q6="http://schemas.ntreev.com" minOccurs="0" name="SubscribeDataBaseResult" type="q6:ResultBaseOfDataBaseCollectionMetaDataq8erDhHE" />
+      </xs:sequence>
+    </xs:complexType>
+  </xs:element>
   <xs:element name="Unsubscribe">
     <xs:complexType>
       <xs:sequence />
@@ -39,7 +54,7 @@
   <xs:element name="UnsubscribeResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q5="http://schemas.ntreev.com" minOccurs="0" name="UnsubscribeResult" type="q5:ResultBase" />
+        <xs:element xmlns:q7="http://schemas.ntreev.com" minOccurs="0" name="UnsubscribeResult" type="q7:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -53,7 +68,7 @@
   <xs:element name="SetPublicResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q6="http://schemas.ntreev.com" minOccurs="0" name="SetPublicResult" type="q6:ResultBase" />
+        <xs:element xmlns:q8="http://schemas.ntreev.com" minOccurs="0" name="SetPublicResult" type="q8:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -67,7 +82,7 @@
   <xs:element name="SetPrivateResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q7="http://schemas.ntreev.com" minOccurs="0" name="SetPrivateResult" type="q7:ResultBaseOfAccessInfoq8erDhHE" />
+        <xs:element xmlns:q9="http://schemas.ntreev.com" minOccurs="0" name="SetPrivateResult" type="q9:ResultBaseOfAccessInfoq8erDhHE" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -76,14 +91,14 @@
       <xs:sequence>
         <xs:element minOccurs="0" name="dataBaseName" nillable="true" type="xs:string" />
         <xs:element minOccurs="0" name="memberID" nillable="true" type="xs:string" />
-        <xs:element xmlns:q8="http://schemas.ntreev.com" minOccurs="0" name="accessType" type="q8:AccessType" />
+        <xs:element xmlns:q10="http://schemas.ntreev.com" minOccurs="0" name="accessType" type="q10:AccessType" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="AddAccessMemberResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q9="http://schemas.ntreev.com" minOccurs="0" name="AddAccessMemberResult" type="q9:ResultBaseOfAccessMemberInfoq8erDhHE" />
+        <xs:element xmlns:q11="http://schemas.ntreev.com" minOccurs="0" name="AddAccessMemberResult" type="q11:ResultBaseOfAccessMemberInfoq8erDhHE" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -92,14 +107,14 @@
       <xs:sequence>
         <xs:element minOccurs="0" name="dataBaseName" nillable="true" type="xs:string" />
         <xs:element minOccurs="0" name="memberID" nillable="true" type="xs:string" />
-        <xs:element xmlns:q10="http://schemas.ntreev.com" minOccurs="0" name="accessType" type="q10:AccessType" />
+        <xs:element xmlns:q12="http://schemas.ntreev.com" minOccurs="0" name="accessType" type="q12:AccessType" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="SetAccessMemberResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q11="http://schemas.ntreev.com" minOccurs="0" name="SetAccessMemberResult" type="q11:ResultBaseOfAccessMemberInfoq8erDhHE" />
+        <xs:element xmlns:q13="http://schemas.ntreev.com" minOccurs="0" name="SetAccessMemberResult" type="q13:ResultBaseOfAccessMemberInfoq8erDhHE" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -114,7 +129,7 @@
   <xs:element name="RemoveAccessMemberResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q12="http://schemas.ntreev.com" minOccurs="0" name="RemoveAccessMemberResult" type="q12:ResultBase" />
+        <xs:element xmlns:q14="http://schemas.ntreev.com" minOccurs="0" name="RemoveAccessMemberResult" type="q14:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -129,7 +144,7 @@
   <xs:element name="LockResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q13="http://schemas.ntreev.com" minOccurs="0" name="LockResult" type="q13:ResultBaseOfLockInfoq8erDhHE" />
+        <xs:element xmlns:q15="http://schemas.ntreev.com" minOccurs="0" name="LockResult" type="q15:ResultBaseOfLockInfoq8erDhHE" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -143,7 +158,7 @@
   <xs:element name="UnlockResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q14="http://schemas.ntreev.com" minOccurs="0" name="UnlockResult" type="q14:ResultBase" />
+        <xs:element xmlns:q16="http://schemas.ntreev.com" minOccurs="0" name="UnlockResult" type="q16:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -157,7 +172,7 @@
   <xs:element name="LoadResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q15="http://schemas.ntreev.com" minOccurs="0" name="LoadResult" type="q15:ResultBase" />
+        <xs:element xmlns:q17="http://schemas.ntreev.com" minOccurs="0" name="LoadResult" type="q17:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -171,7 +186,7 @@
   <xs:element name="UnloadResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q16="http://schemas.ntreev.com" minOccurs="0" name="UnloadResult" type="q16:ResultBase" />
+        <xs:element xmlns:q18="http://schemas.ntreev.com" minOccurs="0" name="UnloadResult" type="q18:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -186,7 +201,7 @@
   <xs:element name="CreateResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q17="http://schemas.ntreev.com" minOccurs="0" name="CreateResult" type="q17:ResultBaseOfDataBaseInfoq8erDhHE" />
+        <xs:element xmlns:q19="http://schemas.ntreev.com" minOccurs="0" name="CreateResult" type="q19:ResultBaseOfDataBaseInfoq8erDhHE" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -203,7 +218,7 @@
   <xs:element name="CopyResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q18="http://schemas.ntreev.com" minOccurs="0" name="CopyResult" type="q18:ResultBaseOfDataBaseInfoq8erDhHE" />
+        <xs:element xmlns:q20="http://schemas.ntreev.com" minOccurs="0" name="CopyResult" type="q20:ResultBaseOfDataBaseInfoq8erDhHE" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -218,7 +233,7 @@
   <xs:element name="RenameResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q19="http://schemas.ntreev.com" minOccurs="0" name="RenameResult" type="q19:ResultBase" />
+        <xs:element xmlns:q21="http://schemas.ntreev.com" minOccurs="0" name="RenameResult" type="q21:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -232,7 +247,7 @@
   <xs:element name="DeleteResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q20="http://schemas.ntreev.com" minOccurs="0" name="DeleteResult" type="q20:ResultBase" />
+        <xs:element xmlns:q22="http://schemas.ntreev.com" minOccurs="0" name="DeleteResult" type="q22:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -246,7 +261,7 @@
   <xs:element name="GetLogResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q21="http://schemas.ntreev.com" minOccurs="0" name="GetLogResult" type="q21:ResultBaseOfArrayOfLogInfoq8erDhHE" />
+        <xs:element xmlns:q23="http://schemas.ntreev.com" minOccurs="0" name="GetLogResult" type="q23:ResultBaseOfArrayOfLogInfoq8erDhHE" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -261,7 +276,7 @@
   <xs:element name="RevertResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q22="http://schemas.ntreev.com" minOccurs="0" name="RevertResult" type="q22:ResultBase" />
+        <xs:element xmlns:q24="http://schemas.ntreev.com" minOccurs="0" name="RevertResult" type="q24:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -275,7 +290,7 @@
   <xs:element name="BeginTransactionResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q23="http://schemas.ntreev.com" minOccurs="0" name="BeginTransactionResult" type="q23:ResultBase" />
+        <xs:element xmlns:q25="http://schemas.ntreev.com" minOccurs="0" name="BeginTransactionResult" type="q25:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -289,7 +304,7 @@
   <xs:element name="EndTransactionResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q24="http://schemas.ntreev.com" minOccurs="0" name="EndTransactionResult" type="q24:ResultBase" />
+        <xs:element xmlns:q26="http://schemas.ntreev.com" minOccurs="0" name="EndTransactionResult" type="q26:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -303,7 +318,7 @@
   <xs:element name="CancelTransactionResponse">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q25="http://schemas.ntreev.com" minOccurs="0" name="CancelTransactionResult" type="q25:ResultBase" />
+        <xs:element xmlns:q27="http://schemas.ntreev.com" minOccurs="0" name="CancelTransactionResult" type="q27:ResultBase" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
@@ -322,17 +337,17 @@
   <xs:element name="OnServiceClosed">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q26="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q26:SignatureDate" />
-        <xs:element xmlns:q27="http://schemas.ntreev.com" minOccurs="0" name="closeInfo" type="q27:CloseInfo" />
+        <xs:element xmlns:q28="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q28:SignatureDate" />
+        <xs:element xmlns:q29="http://schemas.ntreev.com" minOccurs="0" name="closeInfo" type="q29:CloseInfo" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesCreated">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q28="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q28:SignatureDate" />
-        <xs:element xmlns:q29="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q29:ArrayOfstring" />
-        <xs:element xmlns:q30="http://schemas.ntreev.com" minOccurs="0" name="dataBaseInfos" nillable="true" type="q30:ArrayOfDataBaseInfo" />
+        <xs:element xmlns:q30="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q30:SignatureDate" />
+        <xs:element xmlns:q31="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q31:ArrayOfstring" />
+        <xs:element xmlns:q32="http://schemas.ntreev.com" minOccurs="0" name="dataBaseInfos" nillable="true" type="q32:ArrayOfDataBaseInfo" />
         <xs:element minOccurs="0" name="comment" nillable="true" type="xs:string" />
       </xs:sequence>
     </xs:complexType>
@@ -340,106 +355,106 @@
   <xs:element name="OnDataBasesRenamed">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q31="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q31:SignatureDate" />
-        <xs:element xmlns:q32="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q32:ArrayOfstring" />
-        <xs:element xmlns:q33="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="newDataBaseNames" nillable="true" type="q33:ArrayOfstring" />
+        <xs:element xmlns:q33="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q33:SignatureDate" />
+        <xs:element xmlns:q34="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q34:ArrayOfstring" />
+        <xs:element xmlns:q35="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="newDataBaseNames" nillable="true" type="q35:ArrayOfstring" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesDeleted">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q34="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q34:SignatureDate" />
-        <xs:element xmlns:q35="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q35:ArrayOfstring" />
+        <xs:element xmlns:q36="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q36:SignatureDate" />
+        <xs:element xmlns:q37="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q37:ArrayOfstring" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesLoaded">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q36="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q36:SignatureDate" />
-        <xs:element xmlns:q37="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q37:ArrayOfstring" />
+        <xs:element xmlns:q38="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q38:SignatureDate" />
+        <xs:element xmlns:q39="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q39:ArrayOfstring" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesUnloaded">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q38="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q38:SignatureDate" />
-        <xs:element xmlns:q39="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q39:ArrayOfstring" />
+        <xs:element xmlns:q40="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q40:SignatureDate" />
+        <xs:element xmlns:q41="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q41:ArrayOfstring" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesResetting">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q40="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q40:SignatureDate" />
-        <xs:element xmlns:q41="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q41:ArrayOfstring" />
+        <xs:element xmlns:q42="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q42:SignatureDate" />
+        <xs:element xmlns:q43="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q43:ArrayOfstring" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesReset">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q42="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q42:SignatureDate" />
-        <xs:element xmlns:q43="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q43:ArrayOfstring" />
-        <xs:element xmlns:q44="http://schemas.ntreev.com" minOccurs="0" name="metaDatas" nillable="true" type="q44:ArrayOfDomainMetaData" />
+        <xs:element xmlns:q44="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q44:SignatureDate" />
+        <xs:element xmlns:q45="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q45:ArrayOfstring" />
+        <xs:element xmlns:q46="http://schemas.ntreev.com" minOccurs="0" name="metaDatas" nillable="true" type="q46:ArrayOfDomainMetaData" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesAuthenticationEntered">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q45="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q45:SignatureDate" />
-        <xs:element xmlns:q46="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q46:ArrayOfstring" />
-        <xs:element xmlns:q47="http://schemas.ntreev.com" minOccurs="0" name="authenticationInfo" type="q47:AuthenticationInfo" />
+        <xs:element xmlns:q47="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q47:SignatureDate" />
+        <xs:element xmlns:q48="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q48:ArrayOfstring" />
+        <xs:element xmlns:q49="http://schemas.ntreev.com" minOccurs="0" name="authenticationInfo" type="q49:AuthenticationInfo" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesAuthenticationLeft">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q48="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q48:SignatureDate" />
-        <xs:element xmlns:q49="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q49:ArrayOfstring" />
-        <xs:element xmlns:q50="http://schemas.ntreev.com" minOccurs="0" name="authenticationInfo" type="q50:AuthenticationInfo" />
+        <xs:element xmlns:q50="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q50:SignatureDate" />
+        <xs:element xmlns:q51="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q51:ArrayOfstring" />
+        <xs:element xmlns:q52="http://schemas.ntreev.com" minOccurs="0" name="authenticationInfo" type="q52:AuthenticationInfo" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesInfoChanged">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q51="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q51:SignatureDate" />
-        <xs:element xmlns:q52="http://schemas.ntreev.com" minOccurs="0" name="dataBaseInfos" nillable="true" type="q52:ArrayOfDataBaseInfo" />
+        <xs:element xmlns:q53="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q53:SignatureDate" />
+        <xs:element xmlns:q54="http://schemas.ntreev.com" minOccurs="0" name="dataBaseInfos" nillable="true" type="q54:ArrayOfDataBaseInfo" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesStateChanged">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q53="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q53:SignatureDate" />
-        <xs:element xmlns:q54="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q54:ArrayOfstring" />
-        <xs:element xmlns:q55="http://schemas.ntreev.com" minOccurs="0" name="dataBaseStates" nillable="true" type="q55:ArrayOfDataBaseState" />
+        <xs:element xmlns:q55="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q55:SignatureDate" />
+        <xs:element xmlns:q56="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="dataBaseNames" nillable="true" type="q56:ArrayOfstring" />
+        <xs:element xmlns:q57="http://schemas.ntreev.com" minOccurs="0" name="dataBaseStates" nillable="true" type="q57:ArrayOfDataBaseState" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesAccessChanged">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q56="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q56:SignatureDate" />
-        <xs:element xmlns:q57="http://schemas.ntreev.com" minOccurs="0" name="changeType" type="q57:AccessChangeType" />
-        <xs:element xmlns:q58="http://schemas.ntreev.com" minOccurs="0" name="accessInfos" nillable="true" type="q58:ArrayOfAccessInfo" />
-        <xs:element xmlns:q59="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="memberIDs" nillable="true" type="q59:ArrayOfstring" />
-        <xs:element xmlns:q60="http://schemas.ntreev.com" minOccurs="0" name="accessTypes" nillable="true" type="q60:ArrayOfAccessType" />
+        <xs:element xmlns:q58="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q58:SignatureDate" />
+        <xs:element xmlns:q59="http://schemas.ntreev.com" minOccurs="0" name="changeType" type="q59:AccessChangeType" />
+        <xs:element xmlns:q60="http://schemas.ntreev.com" minOccurs="0" name="accessInfos" nillable="true" type="q60:ArrayOfAccessInfo" />
+        <xs:element xmlns:q61="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="memberIDs" nillable="true" type="q61:ArrayOfstring" />
+        <xs:element xmlns:q62="http://schemas.ntreev.com" minOccurs="0" name="accessTypes" nillable="true" type="q62:ArrayOfAccessType" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
   <xs:element name="OnDataBasesLockChanged">
     <xs:complexType>
       <xs:sequence>
-        <xs:element xmlns:q61="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q61:SignatureDate" />
-        <xs:element xmlns:q62="http://schemas.ntreev.com" minOccurs="0" name="changeType" type="q62:LockChangeType" />
-        <xs:element xmlns:q63="http://schemas.ntreev.com" minOccurs="0" name="lockInfos" nillable="true" type="q63:ArrayOfLockInfo" />
-        <xs:element xmlns:q64="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="comments" nillable="true" type="q64:ArrayOfstring" />
+        <xs:element xmlns:q63="http://schemas.ntreev.com" minOccurs="0" name="signatureDate" type="q63:SignatureDate" />
+        <xs:element xmlns:q64="http://schemas.ntreev.com" minOccurs="0" name="changeType" type="q64:LockChangeType" />
+        <xs:element xmlns:q65="http://schemas.ntreev.com" minOccurs="0" name="lockInfos" nillable="true" type="q65:ArrayOfLockInfo" />
+        <xs:element xmlns:q66="http://schemas.microsoft.com/2003/10/Serialization/Arrays" minOccurs="0" name="comments" nillable="true" type="q66:ArrayOfstring" />
       </xs:sequence>
     </xs:complexType>
   </xs:element>
diff --git a/common/Ntreev.Crema.Services.Sharing/ICremaHost.cs b/common/Ntreev.Crema.Services.Sharing/ICremaHost.cs
index 0b946dbef..97a19c448 100644
--- a/common/Ntreev.Crema.Services.Sharing/ICremaHost.cs
+++ b/common/Ntreev.Crema.Services.Sharing/ICremaHost.cs
@@ -28,6 +28,7 @@ public interface ICremaHost : IServiceProvider, IDisposable, IDispatcherObject
     {
 #if CLIENT
         Guid Open(string address, string userID, SecureString password);
+        Guid Open(string address, string dataBase, string userID, SecureString password);
 
         string Address { get; }
 
diff --git a/server/Ntreev.Crema.ServiceHosts/Data/DataBaseCollectionService.cs b/server/Ntreev.Crema.ServiceHosts/Data/DataBaseCollectionService.cs
index 002a06dc3..0777f342e 100644
--- a/server/Ntreev.Crema.ServiceHosts/Data/DataBaseCollectionService.cs
+++ b/server/Ntreev.Crema.ServiceHosts/Data/DataBaseCollectionService.cs
@@ -85,6 +85,40 @@ public ResultBase<DataBaseCollectionMetaData> Subscribe(Guid authenticationToken
             return result;
         }
 
+
+        public ResultBase<DataBaseCollectionMetaData> SubscribeDataBase(Guid authenticationToken, string dataBase)
+        {
+            var result = new ResultBase<DataBaseCollectionMetaData>();
+            try
+            {
+                this.userContext.Dispatcher.Invoke(() =>
+                {
+                    this.authentication = this.userContext.Authenticate(authenticationToken);
+                    this.authentication.AddRef(this);
+                    this.OwnerID = this.authentication.ID;
+                    this.userContext.UsersLoggedOut += UserContext_UsersLoggedOut;
+                });
+                result.Value = this.cremaHost.Dispatcher.Invoke(() =>
+                {
+                    this.AttachEventHandlers();
+                    this.logService.Debug($"[{this.OwnerID}] {nameof(DataBaseCollectionService)} {nameof(SubscribeDataBase)}");
+                    return new DataBaseCollectionMetaData
+                    {
+                        DataBases = new[]
+                        {
+                            this.cremaHost.DataBases[dataBase].GetMetaData(authentication)
+                        }
+                    };
+                });
+                result.SignatureDate = this.authentication.SignatureDate;
+            }
+            catch (Exception e)
+            {
+                result.Fault = new CremaFault(e);
+            }
+            return result;
+        }
+
         public ResultBase Unsubscribe()
         {
             var result = new ResultBase();
diff --git a/server/Ntreev.Crema.ServiceHosts/Data/IDataBaseCollectionService.cs b/server/Ntreev.Crema.ServiceHosts/Data/IDataBaseCollectionService.cs
index 90c94c3d2..011ccb46c 100644
--- a/server/Ntreev.Crema.ServiceHosts/Data/IDataBaseCollectionService.cs
+++ b/server/Ntreev.Crema.ServiceHosts/Data/IDataBaseCollectionService.cs
@@ -40,6 +40,9 @@ public interface IDataBaseCollectionService
         [OperationContract]
         ResultBase<DataBaseCollectionMetaData> Subscribe(Guid authenticationToken);
 
+        [OperationContract]
+        ResultBase<DataBaseCollectionMetaData> SubscribeDataBase(Guid authenticationToken, string dataBase);
+
         [OperationContract]
         ResultBase Unsubscribe();