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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.
*/
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 {
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;
}
}