/
PslDataSource.java
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/
PslDataSource.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.cloud.pubsublite.internal.ExtractStatus.toCanonical;
import com.github.benmanes.caffeine.cache.Ticker;
import com.google.auto.service.AutoService;
import com.google.cloud.pubsublite.AdminClient;
import com.google.cloud.pubsublite.SubscriptionPath;
import com.google.cloud.pubsublite.TopicPath;
import java.util.Objects;
import java.util.Optional;
import org.apache.spark.sql.sources.DataSourceRegister;
import org.apache.spark.sql.sources.v2.ContinuousReadSupport;
import org.apache.spark.sql.sources.v2.DataSourceOptions;
import org.apache.spark.sql.sources.v2.DataSourceV2;
import org.apache.spark.sql.sources.v2.MicroBatchReadSupport;
import org.apache.spark.sql.sources.v2.reader.streaming.ContinuousReader;
import org.apache.spark.sql.sources.v2.reader.streaming.MicroBatchReader;
import org.apache.spark.sql.types.StructType;
@AutoService(DataSourceRegister.class)
public final class PslDataSource
implements DataSourceV2, ContinuousReadSupport, MicroBatchReadSupport, DataSourceRegister {
@Override
public String shortName() {
return "pubsublite";
}
@Override
public ContinuousReader createContinuousReader(
Optional<StructType> schema, String checkpointLocation, DataSourceOptions options) {
if (schema.isPresent()) {
throw new IllegalArgumentException(
"PubSub Lite uses fixed schema and custom schema is not allowed");
}
PslDataSourceOptions pslDataSourceOptions =
PslDataSourceOptions.fromSparkDataSourceOptions(options);
SubscriptionPath subscriptionPath = pslDataSourceOptions.subscriptionPath();
TopicPath topicPath;
try (AdminClient adminClient = pslDataSourceOptions.newAdminClient()) {
topicPath = TopicPath.parse(adminClient.getSubscription(subscriptionPath).get().getTopic());
} catch (Throwable t) {
throw toCanonical(t).underlying;
}
PartitionCountReader partitionCountReader =
new CachedPartitionCountReader(pslDataSourceOptions.newAdminClient(), topicPath);
return new PslContinuousReader(
pslDataSourceOptions.newCursorClient(),
pslDataSourceOptions.newMultiPartitionCommitter(partitionCountReader.getPartitionCount()),
pslDataSourceOptions.getSubscriberFactory(),
subscriptionPath,
Objects.requireNonNull(pslDataSourceOptions.flowControlSettings()),
partitionCountReader);
}
@Override
public MicroBatchReader createMicroBatchReader(
Optional<StructType> schema, String checkpointLocation, DataSourceOptions options) {
if (schema.isPresent()) {
throw new IllegalArgumentException(
"PubSub Lite uses fixed schema and custom schema is not allowed");
}
PslDataSourceOptions pslDataSourceOptions =
PslDataSourceOptions.fromSparkDataSourceOptions(options);
SubscriptionPath subscriptionPath = pslDataSourceOptions.subscriptionPath();
TopicPath topicPath;
try (AdminClient adminClient = pslDataSourceOptions.newAdminClient()) {
topicPath = TopicPath.parse(adminClient.getSubscription(subscriptionPath).get().getTopic());
} catch (Throwable t) {
throw toCanonical(t).underlying;
}
PartitionCountReader partitionCountReader =
new CachedPartitionCountReader(pslDataSourceOptions.newAdminClient(), topicPath);
return new PslMicroBatchReader(
pslDataSourceOptions.newCursorClient(),
pslDataSourceOptions.newMultiPartitionCommitter(partitionCountReader.getPartitionCount()),
pslDataSourceOptions.getSubscriberFactory(),
new LimitingHeadOffsetReader(
pslDataSourceOptions.newTopicStatsClient(),
topicPath,
partitionCountReader,
Ticker.systemTicker()),
subscriptionPath,
Objects.requireNonNull(pslDataSourceOptions.flowControlSettings()),
pslDataSourceOptions.maxMessagesPerBatch());
}
}