kafka JsonTimestampExtractor 源码
kafka JsonTimestampExtractor 代码
文件路径：/streams/examples/src/main/java/org/apache/kafka/streams/examples/pageview/JsonTimestampExtractor.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.examples.pageview;
import com.fasterxml.jackson.databind.JsonNode;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.streams.processor.TimestampExtractor;
/**
* A timestamp extractor implementation that tries to extract event time from
* the "timestamp" field in the Json formatted message.
*/
public class JsonTimestampExtractor implements TimestampExtractor {
@Override
public long extract(final ConsumerRecord<Object, Object> record, final long partitionTime) {
if (record.value() instanceof PageViewTypedDemo.PageView) {
return ((PageViewTypedDemo.PageView) record.value()).timestamp;
}
if (record.value() instanceof PageViewTypedDemo.UserProfile) {
return ((PageViewTypedDemo.UserProfile) record.value()).timestamp;
}
if (record.value() instanceof JsonNode) {
return ((JsonNode) record.value()).get("timestamp").longValue();
}
throw new IllegalArgumentException("JsonTimestampExtractor cannot recognize the record value " + record.value());
}
}
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