kafka SubscriptionWrapper 源码

kafka SubscriptionWrapper 代码

文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/foreignkeyjoin/SubscriptionWrapper.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.streams.kstream.internals.foreignkeyjoin;

import org.apache.kafka.common.errors.UnsupportedVersionException;

import java.util.Arrays;
import java.util.Objects;


public class SubscriptionWrapper<K> {
    static final byte VERSION_0 = 0;
    static final byte VERSION_1 = 1;

    static final byte CURRENT_VERSION = VERSION_1;

    // v0 fields:
    private final long[] hash;
    private final Instruction instruction;
    private final byte version;
    private final K primaryKey;
    // v1 fields:
    private final Integer primaryPartition;

    public enum Instruction {
        //Send nothing. Do not propagate.
        DELETE_KEY_NO_PROPAGATE((byte) 0x00),

        //Send (k, null)
        DELETE_KEY_AND_PROPAGATE((byte) 0x01),

        //(changing foreign key, but FK+Val may not exist)
        //Send (k, fk-val) OR
        //Send (k, null) if fk-val does not exist
        PROPAGATE_NULL_IF_NO_FK_VAL_AVAILABLE((byte) 0x02),

        //(first time ever sending key)
        //Send (k, fk-val) only if fk-val exists.
        PROPAGATE_ONLY_IF_FK_VAL_AVAILABLE((byte) 0x03);

        private final byte value;
        Instruction(final byte value) {
            this.value = value;
        }

        public byte getValue() {
            return value;
        }

        public static Instruction fromValue(final byte value) {
            for (final Instruction i: values()) {
                if (i.value == value) {
                    return i;
                }
            }
            throw new IllegalArgumentException("Unknown instruction byte value = " + value);
        }
    }

    public SubscriptionWrapper(final long[] hash, final Instruction instruction, final K primaryKey, final Integer primaryPartition) {
        this(hash, instruction, primaryKey, CURRENT_VERSION, primaryPartition);
    }

    public SubscriptionWrapper(final long[] hash, final Instruction instruction, final K primaryKey, final byte version, final Integer primaryPartition) {
        Objects.requireNonNull(instruction, "instruction cannot be null. Required by downstream processor.");
        Objects.requireNonNull(primaryKey, "primaryKey cannot be null. Required by downstream processor.");
        if (version < 0 || version > CURRENT_VERSION) {
            throw new UnsupportedVersionException("SubscriptionWrapper does not support version " + version);
        }

        this.instruction = instruction;
        this.hash = hash;
        this.primaryKey = primaryKey;
        this.version = version;
        this.primaryPartition = primaryPartition;
    }

    public Instruction getInstruction() {
        return instruction;
    }

    public long[] getHash() {
        return hash;
    }

    public K getPrimaryKey() {
        return primaryKey;
    }

    public byte getVersion() {
        return version;
    }

    public Integer getPrimaryPartition() {
        return primaryPartition;
    }

    @Override
    public String toString() {
        return "SubscriptionWrapper{" +
            "version=" + version +
            ", primaryKey=" + primaryKey +
            ", instruction=" + instruction +
            ", hash=" + Arrays.toString(hash) +
            ", primaryPartition=" + primaryPartition +
            '}';
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        final SubscriptionWrapper<?> that = (SubscriptionWrapper<?>) o;
        return version == that.version && Arrays.equals(hash, that.hash)
            && instruction == that.instruction && Objects.equals(primaryKey, that.primaryKey)
            && Objects.equals(primaryPartition, that.primaryPartition);
    }

    @Override
    public int hashCode() {
        int result = Objects.hash(instruction, version, primaryKey, primaryPartition);
        result = 31 * result + Arrays.hashCode(hash);
        return result;
    }
}

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