CSHARP-915: added MaxWireBatchSize to server info.

Author: craiggwilson

MongoDB.Driver/Communication/MongoServerInstance.cs

@@ -302,6 +302,23 @@ public int MaxWireDocumentSize
             }
         }
 
+        /// <summary>
+        /// Gets the maximum size of the wire batch.
+        /// </summary>
+        /// <value>
+        /// The maximum size of the wire batch.
+        /// </value>
+        public int MaxWireBatchSize
+        {
+            get
+            {
+                lock (_serverInstanceLock)
+                {
+                    return _serverInfo.MaxWireBatchSize;
+                }
+            }
+        }
+
         /// <summary>
         /// Gets the unique sequential Id for this server instance.
         /// </summary>
@@ -703,6 +720,7 @@ private void LookupServerInformation(MongoConnection connection)
                         IsSecondary = false,
                         MaxDocumentSize = currentServerInfo.MaxDocumentSize,
                         MaxMessageLength = currentServerInfo.MaxMessageLength,
+                        MaxWireBatchSize = currentServerInfo.MaxWireBatchSize,
                         ReplicaSetInformation = currentServerInfo.ReplicaSetInformation
                     };
 
@@ -860,6 +878,8 @@ private class ServerInformation
 
             public int MaxWireDocumentSize { get { return MaxDocumentSize + 16 * 1024; } }
 
+            public int MaxWireBatchSize { get; set; }
+
             public ReplicaSetInformation ReplicaSetInformation { get; set; }
 
             public bool IsDifferentFrom(ServerInformation other)
@@ -904,6 +924,11 @@ public bool IsDifferentFrom(ServerInformation other)
                     return true;
                 }
 
+                if (MaxWireBatchSize != other.MaxWireBatchSize)
+                {
+                    return true;
+                }
+
                 if ((ReplicaSetInformation == null && other.ReplicaSetInformation != null) || (ReplicaSetInformation != other.ReplicaSetInformation))
                 {
                     return true;