Allow user to set up a lambda to initialize new connections #705
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sergiyvamz
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| ConnectionProviderManager.setConnectionInitFunc((connection, protocol, hostSpec, props) -> { | ||
| if ("test-database".equals(props.getProperty("database"))) { | ||
| connection.setSchema("test-database-schema"); |
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NIT: assert schema is set for the connection?
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Ops. That's not supposed to be here.
| ### Connection Initialization | ||
| In some cases it's necessary to configure a connection before a user application can use it. Some target drivers provides such functionality and allow to specify a configuration parameter with SQL statements that are executed when connection is established. However, not all drivers supports such functionality. Also, in some cases, additional conditions should be checked in order to identify what initialization is required for a particular connection. | ||
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| AWS JDBC Driver allows to specify a special function that can initialize a connection. It can be done with `ConnectionProviderManager.setConnectionInitFunc` method. `resetConnectionInitFunc` method is also available. |
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The AWS JDBC Driver allows users to specify a specific function that will be executed every time a connection is initialized. This function needs to be wrapped in a ConnectionInitFunc object, that implements the initConnection() method. Once that object is defined, it is passed to the driver using the ConnectionProviderManager.setConnectionInitFunc method.
It is also possible to stop/reset executing this function by using the resetConnectionInitFunc method.
| > :warning: Executing CPU and network intensive code in the initialization function may cause significant performance degradation. | ||
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| ```java | ||
| ConnectionProviderManager.setConnectionInitFunc((connection, protocol, hostSpec, props) -> { |
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NIT: let's also add a case without a lambda
| @@ -100,6 +100,25 @@ DriverConfigurationProfiles.addOrReplaceProfile( | |||
| CustomConnectionPluginFactory.class)); | |||
| ``` | |||
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| ### Connection Initialization | |||
| In some cases it's necessary to configure a connection before a user application can use it. Some target drivers provides such functionality and allow to specify a configuration parameter with SQL statements that are executed when connection is established. However, not all drivers supports such functionality. Also, in some cases, additional conditions should be checked in order to identify what initialization is required for a particular connection. | |||
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In some particular cases, users may need to define a specific configuration for a connection that has just been opened by the driver before an application can use it.
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Co-authored-by: crystall-bitquill <[email protected]>
Co-authored-by: crystall-bitquill <[email protected]>
karenc-bq
reviewed
Oct 27, 2023
karenc-bq
reviewed
Oct 27, 2023
karenc-bq
reviewed
Oct 27, 2023
Co-authored-by: crystall-bitquill <[email protected]>
Co-authored-by: Karen <[email protected]>
Co-authored-by: Karen <[email protected]>
Co-authored-by: Karen <[email protected]>
karenc-bq
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Oct 27, 2023
Merged
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Summary
Allow user to set up a lambda to initialize new connections.
Description
User needs to set an connection initialization function with ConnectionProviderManager.setConnectionInitFunc()
Related to #679
Additional Reviewers
@karenc-bq
@crystall-bitquill
@brunos-bq
@aaronchung-bitquill
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.