add UserStore + RoleStore

zero.Core/Extensions/DocumentStoreExtensions.cs

@@ -0,0 +1,52 @@
+using Raven.Client.Documents;
+using Raven.Client.Documents.Operations.CompareExchange;
+using System;
+using System.Threading.Tasks;
+
+namespace zero.Core.Extensions
+{
+  public static class DocumentStoreExtensions
+  {
+    /// <summary>
+    /// Reserves a key cluster-wide
+    /// </summary>
+    public static async Task<bool> ReserveAsync(this IDocumentStore store, string key, string value = null)
+    {
+      if (String.IsNullOrWhiteSpace(key))
+      {
+        return false;
+      }
+      if (value == null)
+      {
+        value = key;
+      }
+      var operation = new PutCompareExchangeValueOperation<string>(key, value, 0);
+      CompareExchangeResult<string> result = await store.Operations.SendAsync(operation).ConfigureAwait(false);
+      return result.Successful;
+    }
+
+
+    /// <summary>
+    /// Removes a cluster-wide key reservation
+    /// </summary>
+    public static async Task<bool> RemoveReservationAsync(this IDocumentStore store, string key)
+    {
+      if (!String.IsNullOrWhiteSpace(key))
+      {
+        return false;
+      }
+
+      CompareExchangeValue<string> readResult = store.Operations.Send(new GetCompareExchangeValueOperation<string>(key));
+
+      if (readResult == null)
+      {
+        return false;
+      }
+
+      DeleteCompareExchangeValueOperation<string> operation = new DeleteCompareExchangeValueOperation<string>(key, readResult.Index);
+
+      CompareExchangeResult<string> result = await store.Operations.SendAsync(operation).ConfigureAwait(false);
+      return result.Successful;
+    }
+  }
+}