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Kafka on Pulsar implemented using Pulsar Protocol Handler
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/**
 * 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 io.streamnative.pulsar.handlers.kop;

import io.streamnative.pulsar.handlers.kop.storage.PartitionLog;
import io.streamnative.pulsar.handlers.kop.storage.ReplicaManager;
import io.streamnative.pulsar.handlers.kop.utils.delayed.DelayedOperation;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import lombok.extern.slf4j.Slf4j;
import org.apache.bookkeeper.mledger.impl.PositionImpl;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.message.FetchRequestData;

@Slf4j
public class DelayedFetch extends DelayedOperation {
    private final CompletableFuture> callback;
    private final ReplicaManager replicaManager;
    private final long bytesReadable;
    private final int fetchMaxBytes;
    private final boolean readCommitted;
    private final Map readPartitionInfo;
    private final Map readRecordsResult;
    private final MessageFetchContext context;
    protected volatile Boolean hasError;
    protected volatile Boolean produceHappened;
    protected volatile int maxReadEntriesNum;

    protected static final AtomicReferenceFieldUpdater HAS_ERROR_UPDATER =
            AtomicReferenceFieldUpdater.newUpdater(DelayedFetch.class, Boolean.class, "hasError");

    protected static final AtomicReferenceFieldUpdater IS_PRODUCE_HAPPENED_UPDATER =
            AtomicReferenceFieldUpdater.newUpdater(DelayedFetch.class, Boolean.class, "produceHappened");

    protected static final AtomicIntegerFieldUpdater MAX_READ_ENTRIES_NUM_UPDATER =
            AtomicIntegerFieldUpdater.newUpdater(DelayedFetch.class, "maxReadEntriesNum");

    public DelayedFetch(final long delayMs,
                        final int fetchMaxBytes,
                        final long bytesReadable,
                        final boolean readCommitted,
                        final MessageFetchContext context,
                        final ReplicaManager replicaManager,
                        final Map readPartitionInfo,
                        final Map readRecordsResult,
                        final CompletableFuture> callback) {
        super(delayMs, Optional.empty());
        this.readCommitted = readCommitted;
        this.context = context;
        this.callback = callback;
        this.readRecordsResult = readRecordsResult;
        this.readPartitionInfo = readPartitionInfo;
        this.replicaManager = replicaManager;
        this.bytesReadable = bytesReadable;
        this.fetchMaxBytes = fetchMaxBytes;
        this.maxReadEntriesNum = context.getMaxReadEntriesNum();
        this.hasError = false;
        this.produceHappened = false;
    }

    @Override
    public void onExpiration() {
        if (log.isDebugEnabled()) {
            log.debug("Delayed fetch on expiration triggered.");
        }
    }

    @Override
    public void onComplete() {
        if (this.callback.isDone()) {
            return;
        }
        if (HAS_ERROR_UPDATER.get(this) || !IS_PRODUCE_HAPPENED_UPDATER.get(this)) {
            callback.complete(readRecordsResult);
            return;
        }
        replicaManager.readFromLocalLog(
            readCommitted, fetchMaxBytes, maxReadEntriesNum, readPartitionInfo, context
        ).thenAccept(readRecordsResult -> {
            this.context.getStatsLogger().getWaitingFetchesTriggered().addCount(1);
            this.callback.complete(readRecordsResult);
        }).thenAccept(__ -> {
            // Ensure the old decode result are recycled.
            readRecordsResult.forEach((ignore, result) -> {
                result.recycle();
            });
        });
    }

    @Override
    public boolean tryComplete() {
        if (this.callback.isDone()) {
            return true;
        }
        for (Map.Entry entry : readRecordsResult.entrySet()) {
            PartitionLog.ReadRecordsResult result = entry.getValue();
            PartitionLog partitionLog = result.partitionLog();
            if (partitionLog == null) {
                return true;
            }
            PositionImpl currLastPosition = (PositionImpl) partitionLog.getLastPosition();
            if (currLastPosition.compareTo(PositionImpl.EARLIEST) == 0) {
                HAS_ERROR_UPDATER.set(this, true);
                return forceComplete();
            }
            PositionImpl lastPosition = (PositionImpl) result.lastPosition();
            if (currLastPosition.compareTo(lastPosition) > 0) {
                int diffBytes = (int) (fetchMaxBytes - bytesReadable);
                if (diffBytes != fetchMaxBytes) {
                    int adjustedMaxReadEntriesNum = (diffBytes / fetchMaxBytes) * maxReadEntriesNum * 2
                            + maxReadEntriesNum;
                    if (log.isDebugEnabled()) {
                        log.debug("The fetch max bytes is {}, byte readable is {}, "
                                        + "try to adjust the max read entries num to: {}.",
                                fetchMaxBytes, bytesReadable, adjustedMaxReadEntriesNum);
                    }
                    MAX_READ_ENTRIES_NUM_UPDATER.set(this, adjustedMaxReadEntriesNum);
                }
                return IS_PRODUCE_HAPPENED_UPDATER.compareAndSet(this, false, true) && forceComplete();
            }
        }
        return false;
    }
}