chia7712 commented on code in PR #23383:
URL: https://github.com/apache/kafka/pull/23383#discussion_r3944367716


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server/src/main/java/org/apache/kafka/server/purgatory/ReplicaManagerAdapter.java:
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@@ -0,0 +1,73 @@
+/*
+ * 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.kafka.server.purgatory;
+
+import org.apache.kafka.common.TopicIdPartition;
+import org.apache.kafka.common.TopicPartition;
+import org.apache.kafka.common.requests.FetchRequest.PartitionData;
+import org.apache.kafka.server.log.remote.TopicPartitionLog;
+import org.apache.kafka.server.quota.ReplicaQuota;
+import org.apache.kafka.server.storage.log.FetchParams;
+import org.apache.kafka.storage.internals.log.LogReadResult;
+
+import java.util.LinkedHashMap;
+
+/**
+ * Interface to decouple {@link DelayedFetch} from ReplicaManager.
+ */
+public interface ReplicaManagerAdapter {
+    /**
+     * Get the partition for the provided topic partition.
+     *
+     * @param topicPartition The topic partition
+     * @return The partition log
+     */
+    TopicPartitionLog getPartitionOrException(TopicPartition topicPartition);
+
+    /**
+     * Whether the leader should throttle the given replica for the partition.
+     *
+     * @param quota The replica quota
+     * @param partition The topic partition log
+     * @param replicaId The replica ID
+     * @return Whether the leader should throttle the replica
+     */
+    boolean shouldLeaderThrottle(ReplicaQuota quota, TopicPartitionLog 
partition, int replicaId);

Review Comment:
   the implementation is not really related to `ReplicaManager`, so converting 
it to a static helper could streamline this interface



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