[GitHub] [kafka] abbccdda commented on a change in pull request #8725: KAFKA-9608: Transaction Event Simulation Test

[GitBox <gi...@apache.org>]

abbccdda commented on a change in pull request #8725:
URL: https://github.com/apache/kafka/pull/8725#discussion_r490713327



##########
File path: clients/src/test/java/org/apache/kafka/clients/producer/internals/TransactionSimulationCoordinator.java
##########
@@ -0,0 +1,316 @@
+/*
+ * 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.clients.producer.internals;
+
+import org.apache.kafka.clients.ClientRequest;
+import org.apache.kafka.clients.MockClient;
+import org.apache.kafka.common.TopicPartition;
+import org.apache.kafka.common.message.AddOffsetsToTxnResponseData;
+import org.apache.kafka.common.message.EndTxnResponseData;
+import org.apache.kafka.common.message.FindCoordinatorResponseData;
+import org.apache.kafka.common.message.InitProducerIdResponseData;
+import org.apache.kafka.common.protocol.Errors;
+import org.apache.kafka.common.record.MemoryRecords;
+import org.apache.kafka.common.record.Record;
+import org.apache.kafka.common.requests.AbstractRequest;
+import org.apache.kafka.common.requests.AbstractResponse;
+import org.apache.kafka.common.requests.AddOffsetsToTxnRequest;
+import org.apache.kafka.common.requests.AddOffsetsToTxnResponse;
+import org.apache.kafka.common.requests.AddPartitionsToTxnRequest;
+import org.apache.kafka.common.requests.AddPartitionsToTxnResponse;
+import org.apache.kafka.common.requests.EndTxnRequest;
+import org.apache.kafka.common.requests.EndTxnResponse;
+import org.apache.kafka.common.requests.FindCoordinatorRequest;
+import org.apache.kafka.common.requests.FindCoordinatorResponse;
+import org.apache.kafka.common.requests.InitProducerIdRequest;
+import org.apache.kafka.common.requests.InitProducerIdResponse;
+import org.apache.kafka.common.requests.ProduceRequest;
+import org.apache.kafka.common.requests.ProduceResponse;
+import org.apache.kafka.common.requests.ProduceResponse.PartitionResponse;
+import org.apache.kafka.common.requests.TransactionResult;
+import org.apache.kafka.common.requests.TxnOffsetCommitRequest;
+import org.apache.kafka.common.requests.TxnOffsetCommitResponse;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Queue;
+import java.util.Random;
+
+import static org.apache.kafka.common.record.RecordBatch.NO_PRODUCER_EPOCH;
+import static org.apache.kafka.common.record.RecordBatch.NO_PRODUCER_ID;
+
+/**
+ * A reduced functionality of a combination of transaction coordinator and group coordinator.
+ * It provides basic event handling from {@link Sender} with transaction turned on.
+ *
+ * Random fault injection is supported as well, which will return a retriable error to
+ * the client.
+ */
+class TransactionSimulationCoordinator {
+
+    private final Map<TopicPartition, List<Record>> pendingPartitionData;
+    private final Map<TopicPartition, Long> pendingOffsets;
+    private boolean offsetsAddedToTxn = false;
+
+    private long currentProducerId = 0L;
+    private short currentEpoch = 0;
+    private Random faultInjectRandom = new Random();
+
+    public Map<TopicPartition, List<Record>> persistentPartitionData() {
+        return persistentPartitionData;
+    }
+
+    public Map<TopicPartition, Long> committedOffsets() {
+        return committedOffsets;
+    }
+
+    private final Map<TopicPartition, List<Record>> persistentPartitionData;
+    private final Map<TopicPartition, Long> committedOffsets;
+
+    private final MockClient networkClient;
+    private final int throttleTimeMs = 10;
+
+    TransactionSimulationCoordinator(MockClient networkClient) {
+        this.networkClient = networkClient;
+        this.pendingPartitionData = new HashMap<>();
+        this.pendingOffsets = new HashMap<>();
+        this.persistentPartitionData = new HashMap<>();
+        this.committedOffsets = new HashMap<>();
+    }
+
+    void runOnce(boolean dropMessage) {

Review comment:
       so you are suggesting `maybeDisconnect`?




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