org.apache.kafka.streams.state.internals.WrappedSessionStoreIterator 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 java.util.function.Function;
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;
class WrappedSessionStoreIterator implements KeyValueIterator, byte[]> {
private final KeyValueIterator bytesIterator;
private final Function> windowConstructor;
WrappedSessionStoreIterator(final KeyValueIterator bytesIterator) {
this(bytesIterator, SessionKeySchema::from);
}
WrappedSessionStoreIterator(final KeyValueIterator bytesIterator,
final Function> windowConstructor) {
this.bytesIterator = bytesIterator;
this.windowConstructor = windowConstructor;
}
@Override
public void close() {
bytesIterator.close();
}
@Override
public Windowed peekNextKey() {
return windowConstructor.apply(bytesIterator.peekNextKey());
}
@Override
public boolean hasNext() {
return bytesIterator.hasNext();
}
@Override
public KeyValue, byte[]> next() {
final KeyValue next = bytesIterator.next();
return KeyValue.pair(windowConstructor.apply(next.key), next.value);
}
}