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How-to Guides

How-to Guides

How-to Guides

Step-by-step guides for extending Failover with custom behaviour. Every extension point is a Spring @Bean — declare your bean and auto-configuration detects it via @ConditionalOnMissingBean.

  • Custom Key Generator

    Method args are complex objects, need normalisation, or you want composite keys.

    Customise keys

  • Custom Expiry Policy

    Business-calendar TTL, payload-driven expiry, or per-service SLA.

    Customise expiry

  • Exception Policy

    Control whether exceptions are rethrown or swallowed when recovery finds nothing.

    Configure exceptions

  • Recovered Payload Handler

    Return an empty list or default value instead of null when recovery finds nothing.

    Handle null recovery

  • Custom Payload Enricher

    Inject custom metadata into stored or recovered payloads at interception time.

    Enrich payloads

  • Payload Splitter

    Scatter/gather — split collection entries into individual store entries for partial recovery.

    Configure scatter/gather

  • Context Propagation

    Propagate MDC, tenant, or security context across parallel scatter slices.

    Propagate context

  • Payload Column Resolver

    Control how the JDBC store serialises and deserialises the PAYLOAD column.

    Customise serialisation

  • Database Resolver

    Route JDBC operations to different DataSource instances per tenant.

    Configure routing

  • Store Query Resolver

    Override the SQL queries used by the JDBC store for custom schemas or dialects.

    Override queries

  • Observability

    Wire Micrometer metrics, health indicators, and custom log levels for your setup.

    Add observability

Next Steps