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use std::sync::Arc;
use DocId;
// Doc to opstamp is used to identify which
// document should be deleted.
//
// Since the docset matching the query of a delete operation
// is not computed right when the delete operation is received,
// we need to find a way to evaluate, for each document,
// whether the document was added before or after
// the delete operation. This anteriority is used by comparing
// the docstamp of the document.
//
// The doc to opstamp mapping stores precisely an array
// indexed by doc id and storing the opstamp of the document.
//
// This mapping is (for the moment) stricly increasing
// because of the way document id are allocated.
#[derive(Clone)]
pub enum DocToOpstampMapping {
WithMap(Arc<Vec<u64>>),
None,
}
impl From<Vec<u64>> for DocToOpstampMapping {
fn from(opstamps: Vec<u64>) -> DocToOpstampMapping {
DocToOpstampMapping::WithMap(Arc::new(opstamps))
}
}
impl DocToOpstampMapping {
/// Given an opstamp return the limit doc id L
/// such that all doc id D such that
// D >= L iff opstamp(D) >= than `target_opstamp`.
//
// The edge case opstamp = some doc opstamp is in practise
// never called.
pub fn compute_doc_limit(&self, target_opstamp: u64) -> DocId {
match *self {
DocToOpstampMapping::WithMap(ref doc_opstamps) => {
match doc_opstamps.binary_search(&target_opstamp) {
Ok(doc_id) | Err(doc_id) => doc_id as DocId,
}
}
DocToOpstampMapping::None => DocId::max_value(),
}
}
}
#[cfg(test)]
mod tests {
use super::DocToOpstampMapping;
#[test]
fn test_doc_to_opstamp_mapping_none() {
let doc_to_opstamp_mapping = DocToOpstampMapping::None;
assert_eq!(
doc_to_opstamp_mapping.compute_doc_limit(1),
u32::max_value()
);
}
#[test]
fn test_doc_to_opstamp_mapping_complex() {
{
let doc_to_opstamp_mapping = DocToOpstampMapping::from(vec![]);
assert_eq!(doc_to_opstamp_mapping.compute_doc_limit(0u64), 0);
assert_eq!(doc_to_opstamp_mapping.compute_doc_limit(2u64), 0);
}
{
let doc_to_opstamp_mapping = DocToOpstampMapping::from(vec![1u64]);
assert_eq!(doc_to_opstamp_mapping.compute_doc_limit(0u64), 0);
assert_eq!(doc_to_opstamp_mapping.compute_doc_limit(2u64), 1);
}
{
let doc_to_opstamp_mapping = DocToOpstampMapping::from(vec![1u64, 12u64, 17u64, 23u64]);
assert_eq!(doc_to_opstamp_mapping.compute_doc_limit(0u64), 0);
for i in 2u64..13u64 {
assert_eq!(doc_to_opstamp_mapping.compute_doc_limit(i), 1);
}
for i in 13u64..18u64 {
assert_eq!(doc_to_opstamp_mapping.compute_doc_limit(i), 2);
}
for i in 18u64..24u64 {
assert_eq!(doc_to_opstamp_mapping.compute_doc_limit(i), 3);
}
for i in 24u64..30u64 {
assert_eq!(doc_to_opstamp_mapping.compute_doc_limit(i), 4);
}
}
}
}
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