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Introduce version merge engine for primary key table alibaba#213
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Xiaojian Sun
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Dec 25, 2024
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86 changes: 86 additions & 0 deletions
86
fluss-common/src/main/java/com/alibaba/fluss/config/MergeEngine.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| /* | ||
| * Copyright (c) 2024 Alibaba Group Holding Ltd. | ||
| * | ||
| * Licensed 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 com.alibaba.fluss.config; | ||
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| import java.util.Map; | ||
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| /** The merge engine for primary key table. */ | ||
| public class MergeEngine { | ||
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| private final Type type; | ||
| private final String column; | ||
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| private MergeEngine(Type type) { | ||
| this(type, null); | ||
| } | ||
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| private MergeEngine(Type type, String column) { | ||
| this.type = type; | ||
| this.column = column; | ||
| } | ||
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| public static MergeEngine create(Map<String, String> properties) { | ||
| return create(Configuration.fromMap(properties)); | ||
| } | ||
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| public static MergeEngine create(Configuration options) { | ||
| if (options == null) { | ||
| return null; | ||
| } | ||
| MergeEngine.Type type = options.get(ConfigOptions.TABLE_MERGE_ENGINE); | ||
| if (type == null) { | ||
| return null; | ||
| } | ||
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| switch (type) { | ||
| case FIRST_ROW: | ||
| return new MergeEngine(Type.FIRST_ROW); | ||
| case VERSION: | ||
| String column = options.get(ConfigOptions.TABLE_MERGE_ENGINE_VERSION_COLUMN); | ||
| if (column == null) { | ||
| throw new IllegalArgumentException( | ||
| "When the merge engine is set to version, the 'table.merge-engine.version.column' cannot be empty."); | ||
| } | ||
| return new MergeEngine(Type.VERSION, column); | ||
| default: | ||
| throw new UnsupportedOperationException("Unsupported merge engine: " + type); | ||
| } | ||
| } | ||
|
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| public Type getType() { | ||
| return type; | ||
| } | ||
|
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| public String getColumn() { | ||
| return column; | ||
| } | ||
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| public enum Type { | ||
| FIRST_ROW("first_row"), | ||
| VERSION("version"); | ||
| private final String value; | ||
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| Type(String value) { | ||
| this.value = value; | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return value; | ||
| } | ||
| } | ||
| } |
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