/
PslDataWriter.java
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/
PslDataWriter.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 com.google.api.core.ApiFuture;
import com.google.cloud.pubsublite.MessageMetadata;
import com.google.cloud.pubsublite.spark.internal.CachedPublishers;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.flogger.GoogleLogger;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.ExecutionException;
import javax.annotation.concurrent.GuardedBy;
import org.apache.spark.sql.catalyst.InternalRow;
import org.apache.spark.sql.sources.v2.writer.DataWriter;
import org.apache.spark.sql.sources.v2.writer.WriterCommitMessage;
import org.apache.spark.sql.types.StructType;
public class PslDataWriter implements DataWriter<InternalRow> {
private static final GoogleLogger log = GoogleLogger.forEnclosingClass();
private static final CachedPublishers CACHED_PUBLISHERS = new CachedPublishers();
private final long partitionId, taskId, epochId;
private final StructType inputSchema;
private final PslWriteDataSourceOptions writeOptions;
private final CachedPublishers cachedPublishers; // just a reference
@GuardedBy("this")
private final List<ApiFuture<MessageMetadata>> futures = new ArrayList<>();
public PslDataWriter(
long partitionId,
long taskId,
long epochId,
StructType schema,
PslWriteDataSourceOptions writeOptions) {
this(partitionId, taskId, epochId, schema, writeOptions, CACHED_PUBLISHERS);
}
@VisibleForTesting
public PslDataWriter(
long partitionId,
long taskId,
long epochId,
StructType schema,
PslWriteDataSourceOptions writeOptions,
CachedPublishers cachedPublishers) {
this.partitionId = partitionId;
this.taskId = taskId;
this.epochId = epochId;
this.inputSchema = schema;
this.writeOptions = writeOptions;
this.cachedPublishers = cachedPublishers;
}
@Override
public synchronized void write(InternalRow record) {
futures.add(
cachedPublishers
.getOrCreate(writeOptions)
.publish(Objects.requireNonNull(PslSparkUtils.toPubSubMessage(inputSchema, record))));
}
@Override
public synchronized WriterCommitMessage commit() throws IOException {
for (ApiFuture<MessageMetadata> f : futures) {
try {
f.get();
} catch (InterruptedException | ExecutionException e) {
throw new IOException(e);
}
}
log.atInfo().log(
"All writes for partitionId:%d, taskId:%d, epochId:%d succeeded, committing...",
partitionId, taskId, epochId);
return PslWriterCommitMessage.create(futures.size());
}
@Override
public synchronized void abort() {
log.atWarning().log(
"One or more writes for partitionId:%d, taskId:%d, epochId:%d failed, aborted.",
partitionId, taskId, epochId);
}
}