/
MirrorRangeProcessor.java
75 lines (64 loc) · 2.45 KB
/
MirrorRangeProcessor.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
/*
* Copyright 2022 bakdata GmbH
*
* 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.
*/
package com.bakdata.quick.mirror.range;
import edu.umd.cs.findbugs.annotations.Nullable;
import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.streams.processor.api.Processor;
import org.apache.kafka.streams.processor.api.ProcessorContext;
import org.apache.kafka.streams.processor.api.Record;
import org.apache.kafka.streams.state.KeyValueStore;
/**
* Processor for filling up Kafka state store for range queries.
*
* @param <K> key type
* @param <V> value type
*/
@Slf4j
public class MirrorRangeProcessor<K, V> implements Processor<K, V, Void, Void> {
private final String storeName;
private final RangeIndexer<K, V> defaultRangeIndexer;
@Nullable
private KeyValueStore<String, V> store = null;
/**
* Standard constructor.
*
* @param storeName The name of the range store
* @param defaultRangeIndexer Creates and prepares the range index format
*/
public MirrorRangeProcessor(final String storeName, final RangeIndexer<K, V> defaultRangeIndexer) {
this.storeName = storeName;
this.defaultRangeIndexer = defaultRangeIndexer;
}
@Override
public void init(final ProcessorContext<Void, Void> context) {
this.store = context.getStateStore(this.storeName);
}
@Override
public void process(final Record<K, V> record) {
final K key = record.key();
final V value = record.value();
if (this.store == null) {
throw new IllegalStateException("MirrorProcessor was not initialized.");
}
if (value == null) {
log.warn("Skipping range index creation for key {}. Because the value is null.", key);
return;
}
final String rangeIndex = this.defaultRangeIndexer.createIndex(key, value);
log.debug("crating range index: {}", rangeIndex);
this.store.put(rangeIndex, value);
}
}