exceptionfactory commented on code in PR #7076: URL: https://github.com/apache/nifi/pull/7076#discussion_r1203185815
########## nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/eventhub/utils/ComponentStateCheckpointStore.java: ########## @@ -0,0 +1,228 @@ +/* + * 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.nifi.processors.azure.eventhub.utils; + +import com.azure.messaging.eventhubs.CheckpointStore; +import com.azure.messaging.eventhubs.models.Checkpoint; +import com.azure.messaging.eventhubs.models.PartitionContext; +import com.azure.messaging.eventhubs.models.PartitionOwnership; +import org.apache.nifi.components.state.StateMap; +import org.apache.nifi.processor.exception.ProcessException; +import reactor.core.publisher.Flux; +import reactor.core.publisher.Mono; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.function.BiFunction; + +public class ComponentStateCheckpointStore implements CheckpointStore { + public interface State { + StateMap getState() throws IOException; + boolean replaceState(StateMap oldValue, Map<String, String> newValue) throws IOException; + } + + private final String identifier; + private final State state; + + private static final String KEY_CHECKPOINT = "checkpoint"; + private static final String KEY_OWNERSHIP = "ownership"; + + public ComponentStateCheckpointStore(String identifier, State state) { + this.identifier = identifier; + this.state = state; + } + + public Flux<PartitionOwnership> listOwnership(String fullyQualifiedNamespace, String eventHubName, String consumerGroup) { + return Flux.defer( + () -> { + Map<String, String> map; + try { + map = state.getState().toMap(); + } catch (IOException e) { + return Flux.error(e); + } + List<PartitionOwnership> ownerships = getEntries(map, KEY_OWNERSHIP, this::convertOwnership); + return Flux.fromIterable(ownerships).filter( + ownership -> + ownership.getFullyQualifiedNamespace().equals(fullyQualifiedNamespace) + && ownership.getEventHubName().equals(eventHubName) + && ownership.getConsumerGroup().equals(consumerGroup) + ); + } + ); + } + + public Flux<PartitionOwnership> claimOwnership(List<PartitionOwnership> requestedPartitionOwnerships) { + return Flux.fromIterable(requestedPartitionOwnerships).flatMap( + partitionOwnership -> { + final StateMap oldState; + try { + oldState = state.getState(); + } catch (IOException e) { + return Mono.error(e); + } + + String key = makeKey( + KEY_OWNERSHIP, + partitionOwnership.getFullyQualifiedNamespace(), + partitionOwnership.getEventHubName(), + partitionOwnership.getConsumerGroup(), + partitionOwnership.getPartitionId() + ); + + final Map<String, String> newState = new HashMap<>(oldState.toMap()); + long timestamp = System.currentTimeMillis(); + String eTag = identifier + "/" + timestamp; + newState.put(key, eTag); + final boolean success; + try { + success = state.replaceState(oldState, newState); + } catch (IOException e) { + return Mono.error(e); + } + + if (success) { + return Mono.just(partitionOwnership.setETag(eTag)); + } + + return Mono.empty(); + } + ); + } + + public Flux<Checkpoint> listCheckpoints(String fullyQualifiedNamespace, String eventHubName, String consumerGroup) { + return Flux.defer(() -> { + Map<String, String> stateMap; + try { + stateMap = state.getState().toMap(); + } catch (IOException e) { + return Flux.error(e); + } + + List<Checkpoint> checkpoints = getEntries(stateMap, KEY_CHECKPOINT, this::convertCheckpoint); + return Flux.fromIterable(checkpoints).filter( + checkpoint -> + checkpoint.getFullyQualifiedNamespace().equals(fullyQualifiedNamespace) + && checkpoint.getEventHubName().equals(eventHubName) + && checkpoint.getConsumerGroup().equals(consumerGroup) + ); + }); + } + + public Mono<Void> updateCheckpoint(Checkpoint checkpoint) { + final StateMap oldState; + try { + oldState = state.getState(); + } catch (IOException e) { + return Mono.error(e); + } + + Map<String, String> newState = new HashMap<>(oldState.toMap()); + Long offset = checkpoint.getOffset(); + String key = makeKey( + KEY_CHECKPOINT, + checkpoint.getFullyQualifiedNamespace(), + checkpoint.getEventHubName(), + checkpoint.getConsumerGroup(), + checkpoint.getPartitionId() + ); + if (offset == null) { + newState.remove(key); + } else { + newState.put(key, offset.toString()); + } + + try { + state.replaceState(oldState, newState); + } catch (IOException e) { + return Mono.error(e); + } + + // Note that we do not commit here because there is an implicit + // agreement that the process session factory will provide a session + // that is automatically committed (this is done by the processor). + return Mono.empty(); + } + + private Checkpoint convertCheckpoint(PartitionContext context, String value) { + return new Checkpoint() + .setFullyQualifiedNamespace(context.getFullyQualifiedNamespace()) + .setEventHubName(context.getEventHubName()) + .setConsumerGroup(context.getConsumerGroup()) + .setPartitionId(context.getPartitionId()) + .setOffset(Long.parseLong(value)); + } + + private PartitionOwnership convertOwnership(PartitionContext context, String value) { + final String[] parts = value.split("/", 2); + if (parts.length != 2) { + throw new ProcessException(String.format("Invalid ownership value: %s", value)); + } + return new PartitionOwnership() + .setFullyQualifiedNamespace(context.getFullyQualifiedNamespace()) + .setEventHubName(context.getEventHubName()) + .setConsumerGroup(context.getConsumerGroup()) + .setPartitionId(context.getPartitionId()) + .setETag(value) + .setOwnerId(parts[0]) + .setLastModifiedTime(Long.parseLong(parts[1]) + ); + } + + private <T> List<T> getEntries(final Map<String, String> map, String kind, BiFunction<PartitionContext, String, T> extract) throws ProcessException { + final List<T> result = new ArrayList<>(); + for (Map.Entry<String, String> entry : map.entrySet()) { + final String key = entry.getKey(); + final String[] parts = key.split("/", 5); + if (parts.length != 5) { + throw new ProcessException( + String.format("Invalid %s key: %s", kind, entry.getKey()) + ); + } + if (!parts[0].equals(kind)) { + continue; + } + final String fullyQualifiedNamespace = parts[1]; + final String eventHubName = parts[2]; + final String consumerGroup = parts[3]; + final String partitionId = parts[4]; + PartitionContext partitionContext = new PartitionContext( + fullyQualifiedNamespace, + eventHubName, + consumerGroup, + partitionId + ); Review Comment: Recommend pulling this logic out to a separate method so the formatting approach is clear. -- This is an automated message from the Apache Git Service. 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