Add a configuration to wait for session creation

[sakthivelmanii]

Please add a meaningful description for your change here

We will providing an option to the templates to set a minimum time to wait for session before throwing an error. It also retry the session creation for the duration.

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Summary of Changes

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This pull request enhances the Spanner I/O connector by providing a new configuration to manage the initial setup of Spanner sessions. It allows users to specify a duration for which the system should wait and retry session creation, thereby improving the robustness and resilience of applications connecting to Google Cloud Spanner, especially in environments where session availability might be delayed.

Highlights

• New Configuration Option: Introduced a new configuration option, waitForSessionCreationDuration, in SpannerConfig to allow users to specify how long to wait for a Spanner session to be created.
• Session Pool Configuration: Implemented the use of the new waitForSessionCreationDuration in SpannerAccessor to configure the SessionPoolOptions for Spanner connections, enabling a retry mechanism during session creation.
• Default Wait Duration: Defined a default wait duration of 5 minutes for session creation if no specific duration is provided by the user.

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Changelog

• sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/SpannerAccessor.java
  • Imported necessary classes for SessionPoolOptions and Optional.
  • Added a static final DEFAULT_SESSION_WAIT_DURATION constant.
  • Modified the buildSpannerOptions method to retrieve the waitForSessionCreationDuration from SpannerConfig and apply it to the SessionPoolOptions builder.
• sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/SpannerConfig.java
  • Added an abstract getter method getWaitForSessionCreationDuration().
  • Added an abstract builder setter method setWaitForSessionCreationDuration().
  • Introduced public withWaitForSessionCreationDuration() methods (overloaded for ValueProvider and java.time.Duration) with Javadoc for setting the new configuration.

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R: @kennknowles for label java.
R: @nielm for label spanner.

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