Struct mz_adapter::ExecuteContext

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pub struct ExecuteContext { /* private fields */ }
Expand description

Bundle of state related to statement execution.

This struct collects a bundle of state that needs to be threaded through various functions as part of statement execution. Currently, it is only used to finalize execution, by calling one of the methods retire or retire_aysnc. Finalizing execution involves sending the session back to the pgwire layer so that it may be used to process further commands. In the future, it will also involve performing some work on the main coordinator thread (e.g., recording the time at which the statement finished executing) the state necessary to perform this work is bundled in the ExecuteContextExtra object (today, it is simply empty).

Implementations§

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impl ExecuteContext

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pub fn session(&self) -> &Session

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pub fn session_mut(&mut self) -> &mut Session

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pub fn tx(&self) -> &ClientTransmitter<ExecuteResponse>

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pub fn tx_mut(&mut self) -> &mut ClientTransmitter<ExecuteResponse>

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pub fn from_parts( tx: ClientTransmitter<ExecuteResponse>, internal_cmd_tx: UnboundedSender<Message>, session: Session, extra: ExecuteContextExtra ) -> Self

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pub fn into_parts( self ) -> (ClientTransmitter<ExecuteResponse>, UnboundedSender<Message>, Session, ExecuteContextExtra)

By calling this function, the caller takes responsibility for dealing with the instance of ExecuteContextExtra. This is intended to support protocols (like COPY FROM) that involve multiple passes of sending the session back and forth between the coordinator and the pgwire layer. As part of any such protocol, we must ensure that the ExecuteContextExtra (possibly wrapped in a new ExecuteContext) is passed back to the coordinator for eventual retirement.

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pub fn retire(self, result: Result<ExecuteResponse, AdapterError>)

Retire the execution, by sending a message to the coordinator.

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pub fn extra(&self) -> &ExecuteContextExtra

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pub fn extra_mut(&mut self) -> &mut ExecuteContextExtra

Trait Implementations§

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impl Debug for ExecuteContext

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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