/
PslContinuousReader.java
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/
PslContinuousReader.java
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/*
* Copyright 2020 Google LLC
*
* 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.google.cloud.pubsublite.spark;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.cloud.pubsublite.SubscriptionPath;
import com.google.cloud.pubsublite.cloudpubsub.FlowControlSettings;
import com.google.cloud.pubsublite.internal.CursorClient;
import com.google.cloud.pubsublite.internal.wire.SubscriberFactory;
import com.google.cloud.pubsublite.spark.internal.MultiPartitionCommitter;
import com.google.cloud.pubsublite.spark.internal.PartitionCountReader;
import com.google.cloud.pubsublite.spark.internal.PartitionSubscriberFactory;
import com.google.common.annotations.VisibleForTesting;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import org.apache.spark.sql.catalyst.InternalRow;
import org.apache.spark.sql.sources.v2.reader.InputPartition;
import org.apache.spark.sql.sources.v2.reader.streaming.ContinuousReader;
import org.apache.spark.sql.sources.v2.reader.streaming.Offset;
import org.apache.spark.sql.sources.v2.reader.streaming.PartitionOffset;
import org.apache.spark.sql.types.StructType;
public class PslContinuousReader implements ContinuousReader {
private final CursorClient cursorClient;
private final MultiPartitionCommitter committer;
private final PartitionSubscriberFactory partitionSubscriberFactory;
private final SubscriptionPath subscriptionPath;
private final FlowControlSettings flowControlSettings;
private SparkSourceOffset startOffset;
private final PartitionCountReader partitionCountReader;
private final long topicPartitionCount;
@VisibleForTesting
public PslContinuousReader(
CursorClient cursorClient,
MultiPartitionCommitter committer,
PartitionSubscriberFactory partitionSubscriberFactory,
SubscriptionPath subscriptionPath,
FlowControlSettings flowControlSettings,
PartitionCountReader partitionCountReader) {
this.cursorClient = cursorClient;
this.committer = committer;
this.partitionSubscriberFactory = partitionSubscriberFactory;
this.subscriptionPath = subscriptionPath;
this.flowControlSettings = flowControlSettings;
this.partitionCountReader = partitionCountReader;
this.topicPartitionCount = partitionCountReader.getPartitionCount();
}
@Override
public Offset mergeOffsets(PartitionOffset[] offsets) {
return SparkSourceOffset.merge(
Arrays.copyOf(offsets, offsets.length, SparkPartitionOffset[].class));
}
@Override
public Offset deserializeOffset(String json) {
return SparkSourceOffset.fromJson(json);
}
@Override
public Offset getStartOffset() {
return startOffset;
}
@Override
public void setStartOffset(Optional<Offset> start) {
if (start.isPresent()) {
checkArgument(
start.get() instanceof SparkSourceOffset,
"start offset is not instance of SparkSourceOffset.");
startOffset = (SparkSourceOffset) start.get();
return;
}
startOffset =
PslSparkUtils.getSparkStartOffset(cursorClient, subscriptionPath, topicPartitionCount);
}
@Override
public void commit(Offset end) {
checkArgument(
end instanceof SparkSourceOffset, "end offset is not assignable to SparkSourceOffset.");
committer.commit(PslSparkUtils.toPslSourceOffset((SparkSourceOffset) end));
}
@Override
public void stop() {
committer.close();
cursorClient.close();
}
@Override
public StructType readSchema() {
return SparkStructs.DEFAULT_SCHEMA;
}
@Override
public List<InputPartition<InternalRow>> planInputPartitions() {
List<InputPartition<InternalRow>> list = new ArrayList<>();
for (SparkPartitionOffset offset : startOffset.getPartitionOffsetMap().values()) {
PartitionSubscriberFactory partitionSubscriberFactory = this.partitionSubscriberFactory;
SubscriberFactory subscriberFactory =
(consumer) -> partitionSubscriberFactory.newSubscriber(offset.partition(), consumer);
list.add(
new PslContinuousInputPartition(
subscriberFactory,
SparkPartitionOffset.builder()
.partition(offset.partition())
.offset(offset.offset())
.build(),
subscriptionPath,
flowControlSettings));
}
return list;
}
@Override
public boolean needsReconfiguration() {
return partitionCountReader.getPartitionCount() != topicPartitionCount;
}
}