[GitHub] [incubator-seatunnel] Hisoka-X commented on a diff in pull request #2029: [api-draft][connector] Add MongoDB source connector

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

Hisoka-X commented on code in PR #2029:
URL: https://github.com/apache/incubator-seatunnel/pull/2029#discussion_r900920859


##########
seatunnel-connectors/seatunnel-connectors-seatunnel/seatunnel-connector-seatunnel-mongodb/src/main/java/org/apache/seatunnel/connectors/seatunnel/mongodb/source/MongodbSourceSplitEnumerator.java:
##########
@@ -0,0 +1,100 @@
+/*
+ * 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.seatunnel.connectors.seatunnel.mongodb.source;
+
+import org.apache.seatunnel.api.source.SourceSplitEnumerator;
+import org.apache.seatunnel.connectors.seatunnel.mongodb.state.MongodbSourceState;
+
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+
+public class MongodbSourceSplitEnumerator implements SourceSplitEnumerator<MongodbSourceSplit, MongodbSourceState> {
+
+    private final Context<MongodbSourceSplit> context;
+
+    private final Set<Integer> readers;
+
+    private volatile int assigned = -1;
+
+    MongodbSourceSplitEnumerator(Context<MongodbSourceSplit> enumeratorContext) {
+        this.context = enumeratorContext;
+        this.readers = new HashSet<>();
+    }
+
+    @Override
+    public void open() {
+
+    }
+
+    @Override
+    public void run() throws Exception {
+
+    }
+
+    @Override
+    public void close() throws IOException {
+
+    }
+
+    @Override
+    public void addSplitsBack(List<MongodbSourceSplit> splits, int subtaskId) {
+        if (splits.isEmpty()) {
+            return;
+        }
+        if (subtaskId == assigned) {
+            Optional<Integer> otherReader = readers.stream().filter(r -> r != subtaskId).findAny();
+            if (otherReader.isPresent()) {
+                context.assignSplit(otherReader.get(), splits);
+            } else {
+                assigned = -1;
+            }
+        }
+    }
+
+    @Override
+    public int currentUnassignedSplitSize() {
+        return assigned < 0 ? 0 : 1;
+    }
+
+    @Override
+    public void handleSplitRequest(int subtaskId) {
+
+    }
+
+    @Override
+    public void registerReader(int subtaskId) {
+        readers.add(subtaskId);
+        if (assigned < 0) {
+            assigned = subtaskId;
+            context.assignSplit(subtaskId, new MongodbSourceSplit());

Review Comment:
   If every reader will get same split, will it cause duplicate data to be read?



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