kafka MeteredWindowStoreIterator 源码
kafka MeteredWindowStoreIterator 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredWindowStoreIterator.java
/*
* 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.metrics.Sensor;
import org.apache.kafka.common.utils.Time;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.StreamsMetrics;
import org.apache.kafka.streams.state.WindowStoreIterator;
import java.util.function.Function;
class MeteredWindowStoreIterator<V> implements WindowStoreIterator<V> {
private final WindowStoreIterator<byte[]> iter;
private final Sensor sensor;
private final StreamsMetrics metrics;
private final Function<byte[], V> valueFrom;
private final long startNs;
private final Time time;
MeteredWindowStoreIterator(final WindowStoreIterator<byte[]> iter,
final Sensor sensor,
final StreamsMetrics metrics,
final Function<byte[], V> valueFrom,
final Time time) {
this.iter = iter;
this.sensor = sensor;
this.metrics = metrics;
this.valueFrom = valueFrom;
this.startNs = time.nanoseconds();
this.time = time;
}
@Override
public boolean hasNext() {
return iter.hasNext();
}
@Override
public KeyValue<Long, V> next() {
final KeyValue<Long, byte[]> next = iter.next();
return KeyValue.pair(next.key, valueFrom.apply(next.value));
}
@Override
public void close() {
try {
iter.close();
} finally {
sensor.record(time.nanoseconds() - startNs);
}
}
@Override
public Long peekNextKey() {
return iter.peekNextKey();
}
}
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