kafka MeteredTimestampedWindowStore 源码

2022-10-20
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kafka MeteredTimestampedWindowStore 代码

文件路径：/streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredTimestampedWindowStore.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.serialization.Serde;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.common.utils.Time;
import org.apache.kafka.streams.processor.internals.SerdeGetter;
import org.apache.kafka.streams.state.TimestampedWindowStore;
import org.apache.kafka.streams.state.ValueAndTimestamp;
import org.apache.kafka.streams.state.WindowStore;

/**
 * A Metered {@link TimestampedWindowStore} wrapper that is used for recording operation metrics, and hence its
 * inner WindowStore implementation do not need to provide its own metrics collecting functionality.
 * The inner {@link WindowStore} of this class is of type &lt;Bytes,byte[]&gt;, hence we use {@link Serde}s
 * to convert from &lt;K,ValueAndTimestamp&lt;V&gt&gt; to &lt;Bytes,byte[]&gt;
 *
 * @param <K>
 * @param <V>
 */
class MeteredTimestampedWindowStore<K, V>
    extends MeteredWindowStore<K, ValueAndTimestamp<V>>
    implements TimestampedWindowStore<K, V> {

    MeteredTimestampedWindowStore(final WindowStore<Bytes, byte[]> inner,
                                  final long windowSizeMs,
                                  final String metricScope,
                                  final Time time,
                                  final Serde<K> keySerde,
                                  final Serde<ValueAndTimestamp<V>> valueSerde) {
        super(inner, windowSizeMs, metricScope, time, keySerde, valueSerde);
    }

    @SuppressWarnings("unchecked")
    @Override
    protected Serde<ValueAndTimestamp<V>> prepareValueSerde(final Serde<ValueAndTimestamp<V>> valueSerde, final SerdeGetter getter) {
        if (valueSerde == null) {
            return new ValueAndTimestampSerde<>((Serde<V>) getter.valueSerde());
        } else {
            return super.prepareValueSerde(valueSerde, getter);
        }
    }
}

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