kafka WindowedSerdes 源码

kafka WindowedSerdes 代码

文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/WindowedSerdes.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.kstream;

import org.apache.kafka.common.serialization.Deserializer;
import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.common.serialization.Serializer;

public class WindowedSerdes {

    static public class TimeWindowedSerde<T> extends Serdes.WrapperSerde<Windowed<T>> {
        // Default constructor needed for reflection object creation
        public TimeWindowedSerde() {
            super(new TimeWindowedSerializer<>(), new TimeWindowedDeserializer<>());
        }

        @Deprecated
        public TimeWindowedSerde(final Serde<T> inner) {
            super(new TimeWindowedSerializer<>(inner.serializer()), new TimeWindowedDeserializer<>(inner.deserializer()));
        }

        // This constructor can be used for serialize/deserialize a windowed topic
        public TimeWindowedSerde(final Serde<T> inner, final long windowSize) {
            super(new TimeWindowedSerializer<>(inner.serializer()), new TimeWindowedDeserializer<>(inner.deserializer(), windowSize));
        }

        // Helper method for users to specify whether the input topic is a changelog topic for deserializing the key properly.
        public TimeWindowedSerde<T> forChangelog(final boolean isChangelogTopic) {
            final TimeWindowedDeserializer deserializer = (TimeWindowedDeserializer) this.deserializer();
            deserializer.setIsChangelogTopic(isChangelogTopic);
            return this;
        }
    }

    static public class SessionWindowedSerde<T> extends Serdes.WrapperSerde<Windowed<T>> {
        // Default constructor needed for reflection object creation
        public SessionWindowedSerde() {
            super(new SessionWindowedSerializer<>(), new SessionWindowedDeserializer<>());
        }

        public SessionWindowedSerde(final Serde<T> inner) {
            super(new SessionWindowedSerializer<>(inner.serializer()), new SessionWindowedDeserializer<>(inner.deserializer()));
        }
    }

    /**
     * Construct a {@code TimeWindowedSerde} object for the specified inner class type.
     */
    @Deprecated
    static public <T> Serde<Windowed<T>> timeWindowedSerdeFrom(final Class<T> type) {
        return new TimeWindowedSerde<>(Serdes.serdeFrom(type));
    }

    /**
     * Construct a {@code TimeWindowedSerde} object to deserialize changelog topic
     * for the specified inner class type and window size.
     */
    static public <T> Serde<Windowed<T>> timeWindowedSerdeFrom(final Class<T> type, final long windowSize) {
        return new TimeWindowedSerde<>(Serdes.serdeFrom(type), windowSize);
    }

    /**
     * Construct a {@code SessionWindowedSerde} object for the specified inner class type.
     */
    static public <T> Serde<Windowed<T>> sessionWindowedSerdeFrom(final Class<T> type) {
        return new SessionWindowedSerde<>(Serdes.serdeFrom(type));
    }

    static void verifyInnerSerializerNotNull(final Serializer inner,
                                             final Serializer wrapper) {
        if (inner == null) {
            throw new NullPointerException("Inner serializer is `null`. " +
                "User code must use constructor `" + wrapper.getClass().getSimpleName() + "(final Serializer<T> inner)` " +
                "instead of the no-arg constructor.");
        }
    }

    static void verifyInnerDeserializerNotNull(final Deserializer inner,
                                               final Deserializer wrapper) {
        if (inner == null) {
            throw new NullPointerException("Inner deserializer is `null`. " +
                "User code must use constructor `" + wrapper.getClass().getSimpleName() + "(final Deserializer<T> inner)` " +
                "instead of the no-arg constructor.");
        }
    }
}

相关信息

kafka 源码目录

相关文章

kafka Aggregator 源码

kafka Branched 源码

kafka BranchedKStream 源码

kafka CogroupedKStream 源码

kafka Consumed 源码

kafka EmitStrategy 源码

kafka ForeachAction 源码

kafka ForeachProcessor 源码

kafka GlobalKTable 源码

kafka Grouped 源码