Interface TransactionRetryListener
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@InternalApi public interface TransactionRetryListener
Cloud Spanner can abort any read/write transaction because of potential deadlocks or other internal reasons. When a transaction is aborted, the entire transaction should be retried. AConnection
can automatically retry a transaction internally and check whether the results that are returned during a retry attempt are equal to the results during the original transaction. This is done by keeping track of a SHA-256 checksum of all the results that are returned by Spanner during both transactions.This listener class for internal transaction retries allow client applications to do additional testing or logging of transaction retries. Transaction retry listeners of a
Connection
can be added usingConnection.addTransactionRetryListener(TransactionRetryListener)
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Nested Class Summary
Nested Classes Modifier and Type Interface Description static class
TransactionRetryListener.RetryResult
The result of a retry.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description void
retryFinished(com.google.cloud.Timestamp transactionStarted, long transactionId, int retryAttempt, TransactionRetryListener.RetryResult result)
This method is called when a retry has finished.void
retryStarting(com.google.cloud.Timestamp transactionStarted, long transactionId, int retryAttempt)
This method is called when a retry is about to start.
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Method Detail
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retryStarting
void retryStarting(com.google.cloud.Timestamp transactionStarted, long transactionId, int retryAttempt)
This method is called when a retry is about to start.- Parameters:
transactionStarted
- The start date/time of the transaction that is retrying.transactionId
- An internally assigned ID of the transaction (unique during the lifetime of the JVM) that can be used to identify the transaction for logging purposes.retryAttempt
- The number of retry attempts the current transaction has executed, including the current retry attempt.
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retryFinished
void retryFinished(com.google.cloud.Timestamp transactionStarted, long transactionId, int retryAttempt, TransactionRetryListener.RetryResult result)
This method is called when a retry has finished.- Parameters:
transactionStarted
- The start date/time of the transaction that is retrying.transactionId
- An internally assigned ID of the transaction (unique during the lifetime of the JVM) that can be used to identify the transaction for logging purposes.retryAttempt
- The number of retry attempts the current transaction has executed, including the current retry attempt.result
- The result of the retry indicating whether the retry was successful or not.
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