nevzheng commented on code in PR #12132:
URL: https://github.com/apache/gravitino/pull/12132#discussion_r3646933085


##########
common/src/main/java/org/apache/gravitino/encryption/kms/KmsClient.java:
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@@ -0,0 +1,53 @@
+/*
+ * 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 org.apache.gravitino.encryption.kms;
+
+import java.util.Optional;
+import org.apache.gravitino.annotation.DeveloperApi;
+import org.apache.gravitino.exceptions.ConnectionFailedException;
+
+/**
+ * Inspects keys managed by a configured KMS.
+ *
+ * <p>This is a server-side operation client, not a credential-vending API. 
Provider credentials
+ * authenticate calls made by the client and must never be returned to 
callers. This client does not
+ * perform cryptographic operations.
+ */
+@DeveloperApi
+public interface KmsClient extends AutoCloseable {
+
+  /**
+   * Reads the provider-reported properties of a key.
+   *
+   * <p>An empty result means the provider authoritatively reported that the 
key does not exist.
+   * Authentication, authorization, timeout, availability, and other 
indeterminate failures are
+   * reported as exceptions, never as an empty result.
+   *
+   * @param reference key to inspect
+   * @return normalized key properties, or empty when the key authoritatively 
does not exist; never
+   *     null
+   * @throws IllegalArgumentException if the reference does not belong to this 
client
+   * @throws ConnectionFailedException if the provider cannot be queried

Review Comment:
   Done in f4c0e16af. `KmsClient.getKeyProperties` now documents the non-null 
reference requirement and that null or a reference owned by another API/source 
produces `IllegalArgumentException`, matching the reusable contract tests. 
Common tests, Spotless, and Javadocs pass.



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