[GitHub] [rocketmq] ni-ze commented on a diff in pull request #5351: [ISSUE #3799]main compaction process

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

ni-ze commented on code in PR #5351:
URL: https://github.com/apache/rocketmq/pull/5351#discussion_r1049152634


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store/src/main/java/org/apache/rocketmq/store/kv/MessageFetcher.java:
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@@ -0,0 +1,206 @@
+/*
+ * 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.rocketmq.store.kv;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+import org.apache.rocketmq.common.constant.LoggerName;
+import org.apache.rocketmq.common.consumer.ConsumeFromWhere;
+import org.apache.rocketmq.common.protocol.RequestCode;
+import org.apache.rocketmq.common.protocol.ResponseCode;
+import org.apache.rocketmq.common.protocol.header.PullMessageRequestHeader;
+import org.apache.rocketmq.common.protocol.header.PullMessageResponseHeader;
+import org.apache.rocketmq.common.protocol.header.UnregisterClientRequestHeader;
+import org.apache.rocketmq.common.protocol.heartbeat.ConsumeType;
+import org.apache.rocketmq.common.protocol.heartbeat.ConsumerData;
+import org.apache.rocketmq.common.protocol.heartbeat.HeartbeatData;
+import org.apache.rocketmq.common.protocol.heartbeat.MessageModel;
+import org.apache.rocketmq.common.protocol.heartbeat.SubscriptionData;
+import org.apache.rocketmq.common.sysflag.PullSysFlag;
+import org.apache.rocketmq.logging.InternalLogger;
+import org.apache.rocketmq.logging.InternalLoggerFactory;
+import org.apache.rocketmq.remoting.RemotingClient;
+import org.apache.rocketmq.remoting.common.RemotingUtil;
+import org.apache.rocketmq.remoting.exception.RemotingCommandException;
+import org.apache.rocketmq.remoting.exception.RemotingConnectException;
+import org.apache.rocketmq.remoting.exception.RemotingSendRequestException;
+import org.apache.rocketmq.remoting.exception.RemotingTimeoutException;
+import org.apache.rocketmq.remoting.netty.NettyClientConfig;
+import org.apache.rocketmq.remoting.netty.NettyRemotingClient;
+import org.apache.rocketmq.remoting.protocol.LanguageCode;
+import org.apache.rocketmq.remoting.protocol.RemotingCommand;
+
+import java.io.IOException;
+import java.util.function.BiFunction;
+
+public class MessageFetcher implements AutoCloseable {
+
+    private static final InternalLogger log = InternalLoggerFactory.getLogger(LoggerName.STORE_LOGGER_NAME);
+    private final RemotingClient client;
+    public MessageFetcher() {
+        NettyClientConfig nettyClientConfig = new NettyClientConfig();
+        nettyClientConfig.setUseTLS(false);
+        this.client = new NettyRemotingClient(nettyClientConfig);
+        this.client.start();
+    }
+
+    @Override
+    public void close() throws IOException {
+        this.client.shutdown();
+    }
+
+    private PullMessageRequestHeader createPullMessageRequest(String topic, int queueId, long queueOffset, long subVersion) {
+        int sysFlag = PullSysFlag.buildSysFlag(false, false, false, false, true);
+
+        PullMessageRequestHeader requestHeader = new PullMessageRequestHeader();
+        requestHeader.setConsumerGroup(getConsumerGroup(topic, queueId));
+        requestHeader.setTopic(topic);
+        requestHeader.setQueueId(queueId);
+        requestHeader.setQueueOffset(queueOffset);
+        requestHeader.setMaxMsgNums(10);
+        requestHeader.setSysFlag(sysFlag);
+        requestHeader.setCommitOffset(0L);
+        requestHeader.setSuspendTimeoutMillis(20_000L);
+//        requestHeader.setSubscription(subExpression);
+        requestHeader.setSubVersion(subVersion);
+        requestHeader.setMaxMsgBytes(Integer.MAX_VALUE);
+//        requestHeader.setExpressionType(expressionType);
+        return requestHeader;
+    }
+
+    private String getConsumerGroup(String topic, int queueId) {
+        return String.join("-", topic, String.valueOf(queueId), "pull", "group");
+    }
+    private String getClientId() {
+        return String.join("@", RemotingUtil.getLocalAddress(), "compactionIns", "compactionUnit");
+    }
+
+    private boolean prepare(String masterAddr, String topic, String groupName, long subVersion)
+        throws RemotingConnectException, RemotingSendRequestException, RemotingTimeoutException, InterruptedException {
+        HeartbeatData heartbeatData = new HeartbeatData();
+
+        heartbeatData.setClientID(getClientId());
+
+        ConsumerData consumerData = new ConsumerData();
+        consumerData.setGroupName(groupName);
+        consumerData.setConsumeType(ConsumeType.CONSUME_ACTIVELY);
+        consumerData.setMessageModel(MessageModel.CLUSTERING);
+        consumerData.setConsumeFromWhere(ConsumeFromWhere.CONSUME_FROM_FIRST_OFFSET);
+//        consumerData.setSubscriptionDataSet();
+        SubscriptionData subscriptionData = new SubscriptionData();
+        subscriptionData.setTopic(topic);
+        subscriptionData.setSubString(SubscriptionData.SUB_ALL);
+        subscriptionData.setSubVersion(subVersion);
+        consumerData.setSubscriptionDataSet(Sets.newHashSet(subscriptionData));
+
+        heartbeatData.getConsumerDataSet().add(consumerData);
+
+        RemotingCommand request = RemotingCommand.createRequestCommand(RequestCode.HEART_BEAT, null);
+        request.setLanguage(LanguageCode.JAVA);
+        request.setBody(heartbeatData.encode());
+
+        RemotingCommand response = client.invokeSync(masterAddr, request, 1000 * 30L);
+        if (response != null && response.getCode() == ResponseCode.SUCCESS) {
+            return true;
+        }
+        return false;
+    }
+
+    private boolean pullDone(String masterAddr, String groupName)
+        throws RemotingConnectException, RemotingSendRequestException, RemotingTimeoutException, InterruptedException {
+        UnregisterClientRequestHeader requestHeader = new UnregisterClientRequestHeader();
+        requestHeader.setClientID(getClientId());
+        requestHeader.setProducerGroup("");
+        requestHeader.setConsumerGroup(groupName);
+        RemotingCommand request = RemotingCommand.createRequestCommand(RequestCode.UNREGISTER_CLIENT, requestHeader);
+
+        RemotingCommand response = client.invokeSync(masterAddr, request, 1000 * 30L);
+        if (response != null && response.getCode() == ResponseCode.SUCCESS) {
+            return true;
+        }
+        return false;
+    }
+
+    private boolean stopPull(long currPullOffset, long endOffset) {
+        return currPullOffset >= endOffset && endOffset != -1;
+    }
+
+    public void pullMessageFromMaster(String topic, int queueId, long endOffset, String masterAddr,
+        BiFunction<Long, RemotingCommand, Boolean> responseHandler) throws Exception {
+        long currentPullOffset = 0;
+
+        try {
+            long subVersion = System.currentTimeMillis();
+            String groupName = getConsumerGroup(topic, queueId);
+            prepare(masterAddr, topic, groupName, subVersion);

Review Comment:
   the return value is ignored.



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