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feat: Add sample to indicate how to recreate a stream writer. by yirutang · Pull Request #1982 · googleapis/java-bigquerystorage · GitHub
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feat: Add sample to indicate how to recreate a stream writer. #1982

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feat: Add sample to indicate how to recreate a stream writer. #1982

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16 changes: 15 additions & 1 deletion samples/snippets/src/main/java/com/example/bigquerystorage/WriteToDefaultStream.java
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Original file line number Diff line number Diff line change
Expand Up @@ -135,19 +135,26 @@ private static class DataWriter {
// Track the number of in-flight requests to wait for all responses before shutting down.
private final Phaser inflightRequestCount = new Phaser(1);
private final Object lock = new Object();

private JsonStreamWriter streamWriter;

@GuardedBy("lock")
private RuntimeException error = null;

public void initialize(TableName parentTable)
throws DescriptorValidationException, IOException, InterruptedException {
initialize(parentTable.toString());
}

private void initialize(String streamOrTableName)
throws DescriptorValidationException, IOException, InterruptedException {
// Use the JSON stream writer to send records in JSON format. Specify the table name to write
// to the default stream.
// For more information about JsonStreamWriter, see:
// https://googleapis.dev/java/google-cloud-bigquerystorage/latest/com/google/cloud/bigquery/storage/v1/JsonStreamWriter.html
streamWriter =
JsonStreamWriter.newBuilder(parentTable.toString(), BigQueryWriteClient.create()).build();
JsonStreamWriter.newBuilder(streamOrTableName, BigQueryWriteClient.create())
.build();
}

public void append(AppendContext appendContext)
Expand All @@ -158,6 +165,13 @@ public void append(AppendContext appendContext)
throw this.error;
}
}
// All the retraible errors should have been retried within StreamWriter, when user saw the
// writer becomes bad, most likely it is not recoverable error. The sample code here shows
// a possibility of recreate the writer but most likely your program wouldn't want it.
// if (streamWriter.isClosed() && !streamWriter.isUserClosed()) {
// streamWriter.close();
// initialize(streamWriter.getStreamName());
// }
// Append asynchronously for increased throughput.
ApiFuture<AppendRowsResponse> future = streamWriter.append(appendContext.data);
ApiFutures.addCallback(
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