| /* |
| * 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.concurrent.atomic.LongAdder; |
| import java.util.function.Function; |
| |
| import org.apache.kafka.common.metrics.Sensor; |
| import org.apache.kafka.common.utils.Time; |
| import org.apache.kafka.streams.state.VersionedRecordIterator; |
| import org.apache.kafka.streams.state.VersionedRecord; |
| |
| public class MeteredMultiVersionedKeyQueryIterator<V> implements VersionedRecordIterator<V> { |
| |
| private final VersionedRecordIterator<byte[]> iterator; |
| private final Function<VersionedRecord<byte[]>, VersionedRecord<V>> deserializeValue; |
| private final LongAdder numOpenIterators; |
| private final Sensor sensor; |
| private final Time time; |
| private final long startNs; |
| |
| public MeteredMultiVersionedKeyQueryIterator(final VersionedRecordIterator<byte[]> iterator, |
| final Sensor sensor, |
| final Time time, |
| final Function<VersionedRecord<byte[]>, VersionedRecord<V>> deserializeValue, |
| final LongAdder numOpenIterators) { |
| this.iterator = iterator; |
| this.deserializeValue = deserializeValue; |
| this.numOpenIterators = numOpenIterators; |
| this.sensor = sensor; |
| this.time = time; |
| this.startNs = time.nanoseconds(); |
| numOpenIterators.increment(); |
| } |
| |
| |
| @Override |
| public void close() { |
| try { |
| iterator.close(); |
| } finally { |
| sensor.record(time.nanoseconds() - startNs); |
| numOpenIterators.decrement(); |
| } |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return iterator.hasNext(); |
| } |
| |
| @Override |
| public VersionedRecord<V> next() { |
| return deserializeValue.apply(iterator.next()); |
| } |
| } |
| |
| |