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DltAwareProcessor.java
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DltAwareProcessor.java
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/*
* Copyright 2023-2023 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.cloud.stream.binder.kafka.streams;
import java.util.function.BiConsumer;
import java.util.function.Function;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.kafka.streams.processor.api.Record;
import org.springframework.cloud.stream.function.StreamBridge;
import org.springframework.kafka.support.KafkaHeaders;
import org.springframework.messaging.Message;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Custom {@link RecordRecoverableProcessor} that is capable of sending the failed record to a DLT during recovery.
*
* @author Soby Chacko
* @author Steven Gantz
* @sinc 4.1.0
*/
public class DltAwareProcessor<KIn, VIn, KOut, VOut> extends RecordRecoverableProcessor<KIn, VIn, KOut, VOut> {
private static final Log LOG = LogFactory.getLog(DltAwareProcessor.class);
/**
* DLT destination.
*/
private final String dltDestination;
/**
* {@link DltPublishingContext} used for DLT publishing needs.
*/
private final DltPublishingContext dltPublishingContext;
/**
* A {@link BiConsumer} that does the recovery of a failed record.
*/
private BiConsumer<Record<KIn, VIn>, Exception> processorRecordRecoverer;
/**
*
* @param delegateFunction {@link Function} to process the data
* @param dltDestination DLT destination
* @param dltPublishingContext {@link DltPublishingContext}
*/
public DltAwareProcessor(Function<Record<KIn, VIn>, Record<KOut, VOut>> delegateFunction, String dltDestination,
DltPublishingContext dltPublishingContext) {
super(delegateFunction);
Assert.isTrue(StringUtils.hasText(dltDestination), "DLT Destination topic must be provided.");
this.dltDestination = dltDestination;
Assert.notNull(dltPublishingContext, "DltSenderContext cannot be null");
this.dltPublishingContext = dltPublishingContext;
}
@Override
protected BiConsumer<Record<KIn, VIn>, Exception> defaultProcessorRecordRecoverer() {
return (r, e) -> {
StreamBridge streamBridge = this.dltPublishingContext.getStreamBridge();
if (streamBridge != null) {
Message<VIn> message = MessageBuilder.withPayload(r.value())
.setHeader(KafkaHeaders.KEY, r.key()).build();
DltAwareProcessor.LOG.trace("Recovered from Exception: ", e);
streamBridge.send(this.dltDestination, message);
}
};
}
}