org.apache.kafka.streams.state.internals.MergedSortedCacheWindowStoreIterator Maven / Gradle / Ivy
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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.state.internals;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.state.KeyValueIterator;
import org.apache.kafka.streams.state.WindowStoreIterator;
import static org.apache.kafka.streams.state.internals.SegmentedCacheFunction.bytesFromCacheKey;
/**
* Merges two iterators. Assumes each of them is sorted by key
*
*/
class MergedSortedCacheWindowStoreIterator extends AbstractMergedSortedCacheStoreIterator implements WindowStoreIterator {
MergedSortedCacheWindowStoreIterator(final PeekingKeyValueIterator cacheIterator,
final KeyValueIterator storeIterator,
final boolean forward) {
super(cacheIterator, storeIterator, forward);
}
@Override
public KeyValue deserializeStorePair(final KeyValue pair) {
return pair;
}
@Override
Long deserializeCacheKey(final Bytes cacheKey) {
final byte[] binaryKey = bytesFromCacheKey(cacheKey);
return WindowKeySchema.extractStoreTimestamp(binaryKey);
}
@Override
byte[] deserializeCacheValue(final LRUCacheEntry cacheEntry) {
return cacheEntry.value();
}
@Override
public Long deserializeStoreKey(final Long key) {
return key;
}
@Override
public int compare(final Bytes cacheKey, final Long storeKey) {
final byte[] binaryKey = bytesFromCacheKey(cacheKey);
final Long cacheTimestamp = WindowKeySchema.extractStoreTimestamp(binaryKey);
return cacheTimestamp.compareTo(storeKey);
}
}