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The JBI spec defines service invocation as an instance of an interaction between a service consumer and a service provider. The following are the four service invocation patterns are required to be supported by any JBI implementation:

• OneIn-WayOnly: consumer issues a request to provider with no error (fault) path provided.

• Reliable One In-WayOnly: consumer issues a request to provider. Provider may respond with a fault if it fails to
  process request.

• RequestIn-ResponseOut: consumer issues a request to provider, with expectation of response. Provider may
  respond with a fault if it fails to process request.

• Request In Optional-ResponseOut: consumer issues a request to provider, which may result in a response.
  Consumer and provider both have the option of generating a fault in response to a message received during
  the interaction.

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