org.apache.kafka.streams.state.internals.WindowStoreIteratorWrapper 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.kstream.Windowed;
import org.apache.kafka.streams.state.KeyValueIterator;
import org.apache.kafka.streams.state.WindowStoreIterator;
class WindowStoreIteratorWrapper {
private final KeyValueIterator bytesIterator;
private final long windowSize;
WindowStoreIteratorWrapper(final KeyValueIterator bytesIterator,
final long windowSize) {
this.bytesIterator = bytesIterator;
this.windowSize = windowSize;
}
public WindowStoreIterator valuesIterator() {
return new WrappedWindowStoreIterator(bytesIterator);
}
public KeyValueIterator, byte[]> keyValueIterator() {
return new WrappedKeyValueIterator(bytesIterator, windowSize);
}
private static class WrappedWindowStoreIterator implements WindowStoreIterator {
final KeyValueIterator bytesIterator;
WrappedWindowStoreIterator(
final KeyValueIterator bytesIterator) {
this.bytesIterator = bytesIterator;
}
@Override
public Long peekNextKey() {
return WindowKeySchema.extractStoreTimestamp(bytesIterator.peekNextKey().get());
}
@Override
public boolean hasNext() {
return bytesIterator.hasNext();
}
@Override
public KeyValue next() {
final KeyValue next = bytesIterator.next();
final long timestamp = WindowKeySchema.extractStoreTimestamp(next.key.get());
return KeyValue.pair(timestamp, next.value);
}
@Override
public void close() {
bytesIterator.close();
}
}
private static class WrappedKeyValueIterator implements KeyValueIterator, byte[]> {
final KeyValueIterator bytesIterator;
final long windowSize;
WrappedKeyValueIterator(final KeyValueIterator bytesIterator,
final long windowSize) {
this.bytesIterator = bytesIterator;
this.windowSize = windowSize;
}
@Override
public Windowed peekNextKey() {
final byte[] nextKey = bytesIterator.peekNextKey().get();
return WindowKeySchema.fromStoreBytesKey(nextKey, windowSize);
}
@Override
public boolean hasNext() {
return bytesIterator.hasNext();
}
@Override
public KeyValue, byte[]> next() {
final KeyValue next = bytesIterator.next();
return KeyValue.pair(WindowKeySchema.fromStoreBytesKey(next.key.get(), windowSize), next.value);
}
@Override
public void close() {
bytesIterator.close();
}
}
}