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KAFKA-18304; Introduce json converter generator (#18458)
This patch introduces json converter generator for the coordinator records. It is not used yet but more patches will follow to make us of them. Reviewers: Chia-Ping Tsai <[email protected]>
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209 changes: 209 additions & 0 deletions
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...ator/src/main/java/org/apache/kafka/message/CoordinatorRecordJsonConvertersGenerator.java
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|---|---|---|
| @@ -0,0 +1,209 @@ | ||
| /* | ||
| * 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.message; | ||
|
|
||
| import java.io.BufferedWriter; | ||
| import java.io.IOException; | ||
| import java.util.Map; | ||
| import java.util.TreeMap; | ||
|
|
||
| public class CoordinatorRecordJsonConvertersGenerator implements TypeClassGenerator { | ||
| private final HeaderGenerator headerGenerator; | ||
| private final CodeBuffer buffer; | ||
| private final TreeMap<Short, CoordinatorRecord> records; | ||
|
|
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| private static final class CoordinatorRecord { | ||
| final short id; | ||
| MessageSpec key; | ||
| MessageSpec value; | ||
|
|
||
| CoordinatorRecord(short id) { | ||
| this.id = id; | ||
| } | ||
| } | ||
|
|
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| public CoordinatorRecordJsonConvertersGenerator(String packageName) { | ||
| this.headerGenerator = new HeaderGenerator(packageName); | ||
| this.records = new TreeMap<>(); | ||
| this.buffer = new CodeBuffer(); | ||
| } | ||
|
|
||
| @Override | ||
| public String outputName() { | ||
| return MessageGenerator.COORDINATOR_RECORD_JSON_CONVERTERS_JAVA; | ||
| } | ||
|
|
||
| @Override | ||
| public void registerMessageType(MessageSpec spec) { | ||
| switch (spec.type()) { | ||
| case COORDINATOR_KEY: { | ||
| short id = spec.apiKey().get(); | ||
| CoordinatorRecord record = records.computeIfAbsent(id, __ -> new CoordinatorRecord(id)); | ||
| if (record.key != null) { | ||
| throw new RuntimeException("Duplicate coordinator record key for type " + | ||
| id + ". Original claimant: " + record.key.name() + ". New " + | ||
| "claimant: " + spec.name()); | ||
| } | ||
| record.key = spec; | ||
| break; | ||
| } | ||
|
|
||
| case COORDINATOR_VALUE: { | ||
| short id = spec.apiKey().get(); | ||
| CoordinatorRecord record = records.computeIfAbsent(id, __ -> new CoordinatorRecord(id)); | ||
| if (record.value != null) { | ||
| throw new RuntimeException("Duplicate coordinator record value for type " + | ||
| id + ". Original claimant: " + record.key.name() + ". New " + | ||
| "claimant: " + spec.name()); | ||
| } | ||
| record.value = spec; | ||
| break; | ||
| } | ||
|
|
||
| default: | ||
| // Ignore | ||
| } | ||
| } | ||
|
|
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| @Override | ||
| public void generateAndWrite(BufferedWriter writer) throws IOException { | ||
| buffer.printf("public class CoordinatorRecordJsonConverters {%n"); | ||
| buffer.incrementIndent(); | ||
| generateWriteKeyJson(); | ||
| buffer.printf("%n"); | ||
| generateWriteValueJson(); | ||
| buffer.printf("%n"); | ||
| generateReadKeyFromJson(); | ||
| buffer.printf("%n"); | ||
| generateReadValueFromJson(); | ||
| buffer.printf("%n"); | ||
| buffer.decrementIndent(); | ||
| buffer.printf("}%n"); | ||
| headerGenerator.generate(); | ||
|
|
||
| headerGenerator.buffer().write(writer); | ||
| buffer.write(writer); | ||
| } | ||
|
|
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| private void generateWriteKeyJson() { | ||
| headerGenerator.addImport(MessageGenerator.JSON_NODE_CLASS); | ||
| headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS); | ||
|
|
||
| buffer.printf("public static JsonNode writeRecordKeyAsJson(ApiMessage key) {%n"); | ||
| buffer.incrementIndent(); | ||
| buffer.printf("switch (key.apiKey()) {%n"); | ||
| buffer.incrementIndent(); | ||
| for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) { | ||
| String apiMessageClassName = MessageGenerator.capitalizeFirst(entry.getValue().key.name()); | ||
| buffer.printf("case %d:%n", entry.getKey()); | ||
| buffer.incrementIndent(); | ||
| buffer.printf("return %sJsonConverter.write((%s) key, (short) 0);%n", apiMessageClassName, apiMessageClassName); | ||
| buffer.decrementIndent(); | ||
| } | ||
| buffer.printf("default:%n"); | ||
| buffer.incrementIndent(); | ||
| headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS); | ||
| buffer.printf("throw new UnsupportedVersionException(\"Unknown record id \"" + | ||
| " + key.apiKey());%n"); | ||
| buffer.decrementIndent(); | ||
| buffer.decrementIndent(); | ||
| buffer.printf("}%n"); | ||
| buffer.decrementIndent(); | ||
| buffer.printf("}%n"); | ||
| } | ||
|
|
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| private void generateWriteValueJson() { | ||
| headerGenerator.addImport(MessageGenerator.JSON_NODE_CLASS); | ||
| headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS); | ||
|
|
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| buffer.printf("public static JsonNode writeRecordValueAsJson(ApiMessage value, short version) {%n"); | ||
| buffer.incrementIndent(); | ||
| buffer.printf("switch (value.apiKey()) {%n"); | ||
| buffer.incrementIndent(); | ||
| for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) { | ||
| String apiMessageClassName = MessageGenerator.capitalizeFirst(entry.getValue().value.name()); | ||
| buffer.printf("case %d:%n", entry.getKey()); | ||
| buffer.incrementIndent(); | ||
| buffer.printf("return %sJsonConverter.write((%s) value, version);%n", apiMessageClassName, apiMessageClassName); | ||
| buffer.decrementIndent(); | ||
| } | ||
| buffer.printf("default:%n"); | ||
| buffer.incrementIndent(); | ||
| headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS); | ||
| buffer.printf("throw new UnsupportedVersionException(\"Unknown record id \"" + | ||
| " + value.apiKey());%n"); | ||
| buffer.decrementIndent(); | ||
| buffer.decrementIndent(); | ||
| buffer.printf("}%n"); | ||
| buffer.decrementIndent(); | ||
| buffer.printf("}%n"); | ||
| } | ||
|
|
||
| private void generateReadKeyFromJson() { | ||
| headerGenerator.addImport(MessageGenerator.JSON_NODE_CLASS); | ||
| headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS); | ||
|
|
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| buffer.printf("public static ApiMessage readRecordKeyFromJson(JsonNode json, short apiKey) {%n"); | ||
| buffer.incrementIndent(); | ||
| buffer.printf("switch (apiKey) {%n"); | ||
| buffer.incrementIndent(); | ||
| for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) { | ||
| String apiMessageClassName = MessageGenerator.capitalizeFirst(entry.getValue().key.name()); | ||
| buffer.printf("case %d:%n", entry.getKey()); | ||
| buffer.incrementIndent(); | ||
| buffer.printf("return %sJsonConverter.read(json, (short) 0);%n", apiMessageClassName); | ||
| buffer.decrementIndent(); | ||
| } | ||
| buffer.printf("default:%n"); | ||
| buffer.incrementIndent(); | ||
| headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS); | ||
| buffer.printf("throw new UnsupportedVersionException(\"Unknown record id \"" + | ||
| " + apiKey);%n"); | ||
| buffer.decrementIndent(); | ||
| buffer.decrementIndent(); | ||
| buffer.printf("}%n"); | ||
| buffer.decrementIndent(); | ||
| buffer.printf("}%n"); | ||
| } | ||
|
|
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| private void generateReadValueFromJson() { | ||
| headerGenerator.addImport(MessageGenerator.JSON_NODE_CLASS); | ||
| headerGenerator.addImport(MessageGenerator.API_MESSAGE_CLASS); | ||
|
|
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| buffer.printf("public static ApiMessage readRecordValueFromJson(JsonNode json, short apiKey, short version) {%n"); | ||
| buffer.incrementIndent(); | ||
| buffer.printf("switch (apiKey) {%n"); | ||
| buffer.incrementIndent(); | ||
| for (Map.Entry<Short, CoordinatorRecord> entry : records.entrySet()) { | ||
| String apiMessageClassName = MessageGenerator.capitalizeFirst(entry.getValue().value.name()); | ||
| buffer.printf("case %d:%n", entry.getKey()); | ||
| buffer.incrementIndent(); | ||
| buffer.printf("return %sJsonConverter.read(json, version);%n", apiMessageClassName); | ||
| buffer.decrementIndent(); | ||
| } | ||
| buffer.printf("default:%n"); | ||
| buffer.incrementIndent(); | ||
| headerGenerator.addImport(MessageGenerator.UNSUPPORTED_VERSION_EXCEPTION_CLASS); | ||
| buffer.printf("throw new UnsupportedVersionException(\"Unknown record id \"" + | ||
| " + apiKey);%n"); | ||
| buffer.decrementIndent(); | ||
| buffer.decrementIndent(); | ||
| buffer.printf("}%n"); | ||
| buffer.decrementIndent(); | ||
| buffer.printf("}%n"); | ||
| } | ||
| } |
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