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refactor: QueryChangeStreamAction (#30)
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...src/main/java/org/apache/beam/sdk/io/gcp/spanner/cdc/actions/QueryChangeStreamAction.java
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| /* | ||
| * 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.beam.sdk.io.gcp.spanner.cdc.actions; | ||
|
|
||
| import com.google.cloud.spanner.ResultSet; | ||
| import java.util.List; | ||
| import java.util.Optional; | ||
| import org.apache.beam.sdk.io.gcp.spanner.cdc.dao.ChangeStreamDao; | ||
| import org.apache.beam.sdk.io.gcp.spanner.cdc.mapper.ChangeStreamRecordMapper; | ||
| import org.apache.beam.sdk.io.gcp.spanner.cdc.model.ChangeStreamRecord; | ||
| import org.apache.beam.sdk.io.gcp.spanner.cdc.model.ChildPartitionsRecord; | ||
| import org.apache.beam.sdk.io.gcp.spanner.cdc.model.DataChangeRecord; | ||
| import org.apache.beam.sdk.io.gcp.spanner.cdc.model.HeartbeatRecord; | ||
| import org.apache.beam.sdk.io.gcp.spanner.cdc.model.PartitionMetadata; | ||
| import org.apache.beam.sdk.io.gcp.spanner.cdc.restriction.PartitionPosition; | ||
| import org.apache.beam.sdk.io.gcp.spanner.cdc.restriction.PartitionRestriction; | ||
| import org.apache.beam.sdk.transforms.DoFn.OutputReceiver; | ||
| import org.apache.beam.sdk.transforms.DoFn.ProcessContinuation; | ||
| import org.apache.beam.sdk.transforms.splittabledofn.ManualWatermarkEstimator; | ||
| import org.apache.beam.sdk.transforms.splittabledofn.RestrictionTracker; | ||
| import org.joda.time.Instant; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| // TODO: Add java docs | ||
| public class QueryChangeStreamAction { | ||
|
|
||
| private static final Logger LOG = LoggerFactory.getLogger(QueryChangeStreamAction.class); | ||
| private final ChangeStreamDao changeStreamDao; | ||
| private final ChangeStreamRecordMapper changeStreamRecordMapper; | ||
| private final DataChangeRecordAction dataChangeRecordAction; | ||
| private final HeartbeatRecordAction heartbeatRecordAction; | ||
| private final ChildPartitionsRecordAction childPartitionsRecordAction; | ||
|
|
||
| public QueryChangeStreamAction( | ||
| ChangeStreamDao changeStreamDao, | ||
| ChangeStreamRecordMapper changeStreamRecordMapper, | ||
| DataChangeRecordAction dataChangeRecordAction, | ||
| HeartbeatRecordAction heartbeatRecordAction, | ||
| ChildPartitionsRecordAction childPartitionsRecordAction) { | ||
| this.changeStreamDao = changeStreamDao; | ||
| this.changeStreamRecordMapper = changeStreamRecordMapper; | ||
| this.dataChangeRecordAction = dataChangeRecordAction; | ||
| this.heartbeatRecordAction = heartbeatRecordAction; | ||
| this.childPartitionsRecordAction = childPartitionsRecordAction; | ||
| } | ||
|
|
||
| public Optional<ProcessContinuation> run( | ||
| PartitionMetadata partition, | ||
| RestrictionTracker<PartitionRestriction, PartitionPosition> tracker, | ||
| OutputReceiver<DataChangeRecord> receiver, | ||
| ManualWatermarkEstimator<Instant> watermarkEstimator) { | ||
| final String token = partition.getPartitionToken(); | ||
| try (ResultSet resultSet = | ||
| changeStreamDao.changeStreamQuery( | ||
| token, | ||
| tracker.currentRestriction().getStartTimestamp(), | ||
| partition.isInclusiveStart(), | ||
| partition.getEndTimestamp(), | ||
| partition.isInclusiveEnd(), | ||
| partition.getHeartbeatMillis())) { | ||
| while (resultSet.next()) { | ||
| // TODO: Check what should we do if there is an error here | ||
| final List<ChangeStreamRecord> records = | ||
| changeStreamRecordMapper.toChangeStreamRecords( | ||
| token, resultSet.getCurrentRowAsStruct()); | ||
| LOG.debug("Mapped records: " + records); | ||
|
|
||
| Optional<ProcessContinuation> maybeContinuation; | ||
| for (ChangeStreamRecord record : records) { | ||
| if (record instanceof DataChangeRecord) { | ||
| maybeContinuation = | ||
| dataChangeRecordAction.run( | ||
| partition, (DataChangeRecord) record, tracker, receiver, watermarkEstimator); | ||
| } else if (record instanceof HeartbeatRecord) { | ||
| maybeContinuation = | ||
| heartbeatRecordAction.run( | ||
| partition, (HeartbeatRecord) record, tracker, watermarkEstimator); | ||
| } else if (record instanceof ChildPartitionsRecord) { | ||
| maybeContinuation = | ||
| childPartitionsRecordAction.run( | ||
| partition, (ChildPartitionsRecord) record, tracker, watermarkEstimator); | ||
| } else { | ||
| LOG.error("[" + token + "] Unknown record type " + record.getClass()); | ||
| // FIXME: Check what should we do if the record is unknown | ||
| throw new IllegalArgumentException("Unknown record type " + record.getClass()); | ||
| } | ||
| if (maybeContinuation.isPresent()) { | ||
| LOG.info("[" + token + "] Continuation present, returning " + maybeContinuation); | ||
| return maybeContinuation; | ||
| } | ||
| } | ||
| } | ||
| LOG.info("[" + token + "] = Query change stream action completed successfully"); | ||
| return Optional.empty(); | ||
| } | ||
| } | ||
| } |
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