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https://github.com/lancedb/lancedb.git
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356e89a800
This also refactors the rust lancedb index builder API (and, correspondingly, the nodejs API)
36 lines
1.1 KiB
Rust
36 lines
1.1 KiB
Rust
use std::sync::Mutex;
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use pyo3::{exceptions::PyRuntimeError, PyResult};
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/// A wrapper around a rust builder
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///
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/// Rust builders are often implemented so that the builder methods
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/// consume the builder and return a new one. This is not compatible
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/// with the pyo3, which, being garbage collected, cannot easily obtain
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/// ownership of an object.
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///
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/// This wrapper converts the compile-time safety of rust into runtime
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/// errors if any attempt to use the builder happens after it is consumed.
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pub struct BuilderWrapper<T> {
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name: String,
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inner: Mutex<Option<T>>,
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}
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impl<T> BuilderWrapper<T> {
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pub fn new(name: impl AsRef<str>, inner: T) -> Self {
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Self {
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name: name.as_ref().to_string(),
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inner: Mutex::new(Some(inner)),
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}
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}
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pub fn consume<O>(&self, mod_fn: impl FnOnce(T) -> O) -> PyResult<O> {
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let mut inner = self.inner.lock().unwrap();
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let inner_builder = inner.take().ok_or_else(|| {
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PyRuntimeError::new_err(format!("{} has already been consumed", self.name))
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})?;
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let result = mod_fn(inner_builder);
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Ok(result)
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}
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}
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