com.expediagroup.rhapsody.kafka.acknowledgement.MultipleReceiverAcknowledgementStrategy Maven / Gradle / Ivy

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/**
 * Copyright 2019 Expedia, Inc.
 *
 * 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.
 */
package com.expediagroup.rhapsody.kafka.acknowledgement;

import java.util.function.UnaryOperator;

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.reactivestreams.Publisher;

import com.expediagroup.rhapsody.api.Acknowledgeable;
import com.expediagroup.rhapsody.core.acknowledgement.MultipleAcknowledgementOperator;
import com.expediagroup.rhapsody.kafka.extractor.ConsumerRecordExtraction;

public final class MultipleReceiverAcknowledgementStrategy extends AbstractReceiverAcknowledgementStrategy {

    @Override
    protected  UnaryOperator>>> createOperator(long maxInFlight) {
        // Since acknowledging any Record's offset is assumed to acknowledge all previous offsets,
        // when we're in "unbounded" mode, there's no Operation to apply
        return maxInFlight == Long.MAX_VALUE ? UnaryOperator.identity() :
            (Publisher>> source) ->
                new MultipleAcknowledgementOperator<>(source, ConsumerRecordExtraction::extractTopicPartition, maxInFlight);
    }
}