GPrabhudas commented on a change in pull request #555:
URL: https://github.com/apache/pulsar-client-go/pull/555#discussion_r660231758



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File path: pulsar/crypto/message_metadata.go
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@@ -0,0 +1,122 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package crypto
+
+import (
+       pb "github.com/apache/pulsar-client-go/pulsar/internal/pulsar_proto"
+)
+
+// MessageMetadataSupplier wrapper implementation around message metadata
+type MessageMetadataSupplier interface {

Review comment:
       Goal : Is to provide client(user) to set/read the required information 
in/from `MessageMetadata`.
   
   Meaningful name => I think it is meaningful since it just providing a way to 
read some info from internal `MessageMetadata`
   
   `MessageMetadata` => this is from the `proto` which is an internal package 
and client can not access it directly and this class implemented required 
methods to read/write MessageMetadata.




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