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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2023 Nordix Foundation
* ================================================================================
* 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
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.ncmp.api.impl.async;
import io.cloudevents.CloudEvent;
import io.cloudevents.kafka.impl.KafkaHeaders;
import java.io.Serializable;
import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.common.header.Headers;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.listener.adapter.RecordFilterStrategy;
/**
* Record filter strategies, which helps to filter the consumer records based on some conditions.
*
*/
@Configuration
@Slf4j
public class RecordFilterStrategies {
private static final boolean EXCLUDE_EVENT = true;
/**
* Include only DataOperation events based on the cloud event type header, It
* returns boolean, true means exclude the consumer record and false
* means include the consumer record.
* @return boolean value.
*/
@Bean
public RecordFilterStrategy<String, CloudEvent> includeDataOperationEventsOnly() {
return consumerRecord ->
isNotCloudEventOfType(consumerRecord.headers(), "DataOperationEvent");
}
/**
* Includes the consumer records based on the cloud event type header, It returns boolean,
* true means exclude the consumer record and false means include the consumer record.
* It includes only the legacy events i.e. non-cloud events
* @return boolean value.
*/
@Bean
public RecordFilterStrategy<String, Serializable> includeNonCloudEventsOnly() {
return consumerRecord -> isCloudEvent(consumerRecord.headers());
}
private boolean isCloudEvent(final Headers headers) {
return headers.lastHeader("ce_type") != null;
}
private boolean isNotCloudEventOfType(final Headers headers, final String requiredEventType) {
final String eventTypeHeaderValue = KafkaHeaders.getParsedKafkaHeader(headers, "ce_type");
if (eventTypeHeaderValue == null) {
log.trace("No ce_type header found, possibly a legacy event (ignored)");
return EXCLUDE_EVENT;
}
return !(eventTypeHeaderValue.contains(requiredEventType));
}
}
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