kafka TaggedFields 源码

  • 2022-10-20
  • 浏览 (472)

kafka TaggedFields 代码

文件路径:/clients/src/main/java/org/apache/kafka/common/protocol/types/TaggedFields.java

/*
 * 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.common.protocol.types;

import org.apache.kafka.common.protocol.types.Type.DocumentedType;
import org.apache.kafka.common.utils.ByteUtils;

import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.Map;
import java.util.NavigableMap;
import java.util.TreeMap;

/**
 * Represents a tagged fields section.
 */
public class TaggedFields extends DocumentedType {
    private static final String TAGGED_FIELDS_TYPE_NAME = "TAGGED_FIELDS";

    private final Map<Integer, Field> fields;

    /**
     * Create a new TaggedFields object with the given tags and fields.
     *
     * @param fields    This is an array containing Integer tags followed
     *                  by associated Field objects.
     * @return          The new {@link TaggedFields}
     */
    @SuppressWarnings("unchecked")
    public static TaggedFields of(Object... fields) {
        if (fields.length % 2 != 0) {
            throw new RuntimeException("TaggedFields#of takes an even " +
                "number of parameters.");
        }
        TreeMap<Integer, Field> newFields = new TreeMap<>();
        for (int i = 0; i < fields.length; i += 2) {
            Integer tag = (Integer) fields[i];
            Field field = (Field) fields[i + 1];
            newFields.put(tag, field);
        }
        return new TaggedFields(newFields);
    }

    public TaggedFields(Map<Integer, Field> fields) {
        this.fields = fields;
    }

    @Override
    public boolean isNullable() {
        return false;
    }

    @SuppressWarnings("unchecked")
    @Override
    public void write(ByteBuffer buffer, Object o) {
        NavigableMap<Integer, Object> objects = (NavigableMap<Integer, Object>) o;
        ByteUtils.writeUnsignedVarint(objects.size(), buffer);
        for (Map.Entry<Integer, Object> entry : objects.entrySet()) {
            Integer tag = entry.getKey();
            Field field = fields.get(tag);
            ByteUtils.writeUnsignedVarint(tag, buffer);
            if (field == null) {
                RawTaggedField value = (RawTaggedField) entry.getValue();
                ByteUtils.writeUnsignedVarint(value.data().length, buffer);
                buffer.put(value.data());
            } else {
                ByteUtils.writeUnsignedVarint(field.type.sizeOf(entry.getValue()), buffer);
                field.type.write(buffer, entry.getValue());
            }
        }
    }

    @SuppressWarnings("unchecked")
    @Override
    public NavigableMap<Integer, Object> read(ByteBuffer buffer) {
        int numTaggedFields = ByteUtils.readUnsignedVarint(buffer);
        if (numTaggedFields == 0) {
            return Collections.emptyNavigableMap();
        }
        NavigableMap<Integer, Object> objects = new TreeMap<>();
        int prevTag = -1;
        for (int i = 0; i < numTaggedFields; i++) {
            int tag = ByteUtils.readUnsignedVarint(buffer);
            if (tag <= prevTag) {
                throw new RuntimeException("Invalid or out-of-order tag " + tag);
            }
            prevTag = tag;
            int size = ByteUtils.readUnsignedVarint(buffer);
            Field field = fields.get(tag);
            if (field == null) {
                byte[] bytes = new byte[size];
                buffer.get(bytes);
                objects.put(tag, new RawTaggedField(tag, bytes));
            } else {
                objects.put(tag, field.type.read(buffer));
            }
        }
        return objects;
    }

    @SuppressWarnings("unchecked")
    @Override
    public int sizeOf(Object o) {
        int size = 0;
        NavigableMap<Integer, Object> objects = (NavigableMap<Integer, Object>) o;
        size += ByteUtils.sizeOfUnsignedVarint(objects.size());
        for (Map.Entry<Integer, Object> entry : objects.entrySet()) {
            Integer tag = entry.getKey();
            size += ByteUtils.sizeOfUnsignedVarint(tag);
            Field field = fields.get(tag);
            if (field == null) {
                RawTaggedField value = (RawTaggedField) entry.getValue();
                size += value.data().length + ByteUtils.sizeOfUnsignedVarint(value.data().length);
            } else {
                int valueSize = field.type.sizeOf(entry.getValue());
                size += valueSize + ByteUtils.sizeOfUnsignedVarint(valueSize);
            }
        }
        return size;
    }

    @Override
    public String toString() {
        StringBuilder bld = new StringBuilder("TAGGED_FIELDS_TYPE_NAME(");
        String prefix = "";
        for (Map.Entry<Integer, Field> field : fields.entrySet()) {
            bld.append(prefix);
            prefix = ", ";
            bld.append(field.getKey()).append(" -> ").append(field.getValue().toString());
        }
        bld.append(")");
        return bld.toString();
    }

    @SuppressWarnings("unchecked")
    @Override
    public Map<Integer, Object> validate(Object item) {
        try {
            NavigableMap<Integer, Object> objects = (NavigableMap<Integer, Object>) item;
            for (Map.Entry<Integer, Object> entry : objects.entrySet()) {
                Integer tag = entry.getKey();
                Field field = fields.get(tag);
                if (field == null) {
                    if (!(entry.getValue() instanceof RawTaggedField)) {
                        throw new SchemaException("The value associated with tag " + tag +
                            " must be a RawTaggedField in this version of the software.");
                    }
                } else {
                    field.type.validate(entry.getValue());
                }
            }
            return objects;
        } catch (ClassCastException e) {
            throw new SchemaException("Not a NavigableMap.");
        }
    }

    @Override
    public String typeName() {
        return TAGGED_FIELDS_TYPE_NAME;
    }

    @Override
    public String documentation() {
        return "Represents a series of tagged fields.";
    }

    /**
     * The number of tagged fields
     */
    public int numFields() {
        return this.fields.size();
    }
}

相关信息

kafka 源码目录

相关文章

kafka ArrayOf 源码

kafka BoundField 源码

kafka CompactArrayOf 源码

kafka Field 源码

kafka RawTaggedField 源码

kafka RawTaggedFieldWriter 源码

kafka Schema 源码

kafka SchemaException 源码

kafka Struct 源码

kafka Type 源码

0  赞