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[flink] Extract SourceListState as public utility class
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92 changes: 92 additions & 0 deletions
92
...link/paimon-flink-common/src/main/java/org/apache/paimon/flink/source/SplitListState.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.paimon.flink.source; | ||
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| import org.apache.paimon.utils.Preconditions; | ||
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| import org.apache.flink.api.common.state.ListState; | ||
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| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.function.Function; | ||
| import java.util.stream.Collectors; | ||
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| /** | ||
| * Utility class to provide {@link ListState}-like experience for sources that use {@link | ||
| * SimpleSourceSplit}. | ||
| */ | ||
| public class SplitListState<T> implements ListState<T> { | ||
| private final String splitPrefix; | ||
| private final List<T> values; | ||
| private final Function<T, String> serializer; | ||
| private final Function<String, T> deserializer; | ||
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| public SplitListState( | ||
| String identifier, Function<T, String> serializer, Function<String, T> deserializer) { | ||
| Preconditions.checkArgument( | ||
| !Character.isDigit(identifier.charAt(0)), | ||
| String.format("Identifier %s should not start with digits.", identifier)); | ||
| this.splitPrefix = identifier.length() + identifier; | ||
| this.serializer = serializer; | ||
| this.deserializer = deserializer; | ||
| this.values = new ArrayList<>(); | ||
| } | ||
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| @Override | ||
| public void add(T value) { | ||
| values.add(value); | ||
| } | ||
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| @Override | ||
| public List<T> get() { | ||
| return new ArrayList<>(values); | ||
| } | ||
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| @Override | ||
| public void update(List<T> values) { | ||
| this.values.clear(); | ||
| this.values.addAll(values); | ||
| } | ||
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| @Override | ||
| public void addAll(List<T> values) throws Exception { | ||
| this.values.addAll(values); | ||
| } | ||
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| @Override | ||
| public void clear() { | ||
| values.clear(); | ||
| } | ||
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| public List<SimpleSourceSplit> snapshotState() { | ||
| return values.stream() | ||
| .map(x -> new SimpleSourceSplit(splitPrefix + serializer.apply(x))) | ||
| .collect(Collectors.toList()); | ||
| } | ||
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| public void restoreState(List<SimpleSourceSplit> splits) { | ||
| values.clear(); | ||
| splits.stream() | ||
| .map(SimpleSourceSplit::value) | ||
| .filter(x -> x.startsWith(splitPrefix)) | ||
| .map(x -> x.substring(splitPrefix.length())) | ||
| .map(this.deserializer) | ||
| .forEach(values::add); | ||
| } | ||
| } |
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