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Pre: Push bookkeeping into an InProcess struct.

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This commit is contained in:
Nick Alexander 2017-06-06 12:59:54 -07:00
parent 05129cefbb
commit 4b0881a957
1 changed files with 52 additions and 31 deletions
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65
db/src/tx.rs
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@ -51,6 +51,7 @@ use std::collections::{
BTreeSet,
VecDeque,
};
use std::rc::Rc;
use db;
use db::{
@ -191,10 +192,24 @@ impl<'conn, 'a> Tx<'conn, 'a> {
/// The `Term` instances produce share interned TempId and LookupRef handles, and we return the
/// interned handle sets so that consumers can ensure all handles are used appropriately.
fn entities_into_terms_with_temp_ids_and_lookup_refs<I>(&self, entities: I) -> Result<(Vec<TermWithTempIdsAndLookupRefs>, intern_set::InternSet<TempId>, intern_set::InternSet<AVPair>)> where I: IntoIterator<Item=Entity> {
let mut temp_ids: intern_set::InternSet<TempId> = intern_set::InternSet::new();
let mut lookup_refs: intern_set::InternSet<AVPair> = intern_set::InternSet::new();
struct InProcess<'a> {
schema: &'a Schema,
mentat_id_count: i64,
temp_ids: intern_set::InternSet<TempId>,
lookup_refs: intern_set::InternSet<AVPair>,
}
let intern_lookup_ref = |lookup_refs: &mut intern_set::InternSet<AVPair>, lookup_ref: &entmod::LookupRef| -> Result<LookupRef> {
impl<'a> InProcess<'a> {
fn with_schema(schema: &'a Schema) -> InProcess<'a> {
InProcess {
schema: schema,
mentat_id_count: 0,
temp_ids: intern_set::InternSet::new(),
lookup_refs: intern_set::InternSet::new(),
}
}
fn intern_lookup_ref(&mut self, lookup_ref: &entmod::LookupRef) -> Result<LookupRef> {
let lr_a: i64 = match lookup_ref.a {
entmod::Entid::Entid(ref a) => *a,
entmod::Entid::Ident(ref a) => self.schema.require_entid(&a)?,
@ -206,8 +221,22 @@ impl<'conn, 'a> Tx<'conn, 'a> {
}
let lr_typed_value: TypedValue = self.schema.to_typed_value(&lookup_ref.v, lr_attribute.value_type)?;
Ok(lookup_refs.intern((lr_a, lr_typed_value)))
};
Ok(self.lookup_refs.intern((lr_a, lr_typed_value)))
}
fn intern_temp_id(&mut self, temp_id: TempId) -> Rc<TempId> {
self.temp_ids.intern(temp_id)
}
/// Allocate private internal tempids reserved for Mentat. Internal tempids just need to be
/// unique within one transaction; they should never escape a transaction.
fn allocate_mentat_id(&mut self) -> entmod::EntidOrLookupRefOrTempId {
self.mentat_id_count += 1;
entmod::EntidOrLookupRefOrTempId::TempId(TempId::Internal(self.mentat_id_count))
}
}
let mut in_process = InProcess::with_schema(&self.schema);
// We want to handle entities in the order they're given to us, while also "exploding" some
// entities into many. We therefore push the initial entities onto the back of the deque,
@ -215,14 +244,6 @@ impl<'conn, 'a> Tx<'conn, 'a> {
let mut deque: VecDeque<Entity> = VecDeque::default();
deque.extend(entities);
// Allocate private internal tempids reserved for Mentat. Internal tempids just need to be
// unique within one transaction; they should never escape a transaction.
let mut mentat_id_count = 0;
let mut allocate_mentat_id = move || {
mentat_id_count += 1;
entmod::EntidOrLookupRefOrTempId::TempId(TempId::Internal(mentat_id_count))
};
let mut terms: Vec<TermWithTempIdsAndLookupRefs> = Vec::with_capacity(deque.len());
while let Some(entity) = deque.pop_front() {
@ -230,7 +251,7 @@ impl<'conn, 'a> Tx<'conn, 'a> {
Entity::MapNotation(mut map_notation) => {
// :db/id is optional; if it's not given, we generate a special internal tempid
// to use for upserting. This tempid will not be reported in the TxReport.
let db_id: entmod::EntidOrLookupRefOrTempId = mentat_tx_parser::remove_db_id(&mut map_notation)?.unwrap_or_else(&mut allocate_mentat_id);
let db_id: entmod::EntidOrLookupRefOrTempId = mentat_tx_parser::remove_db_id(&mut map_notation)?.unwrap_or_else(|| in_process.allocate_mentat_id());
// We're not nested, so :db/isComponent is not relevant. We just explode the
// map notation.
@ -255,7 +276,7 @@ impl<'conn, 'a> Tx<'conn, 'a> {
let v = match v {
entmod::AtomOrLookupRefOrVectorOrMapNotation::Atom(v) => {
if attribute.value_type == ValueType::Ref && v.inner.is_text() {
Either::Right(LookupRefOrTempId::TempId(temp_ids.intern(v.inner.as_text().cloned().map(TempId::External).unwrap())))
Either::Right(LookupRefOrTempId::TempId(in_process.intern_temp_id(v.inner.as_text().cloned().map(TempId::External).unwrap())))
} else {
// Here is where we do schema-aware typechecking: we either assert that
// the given value is in the attribute's value set, or (in limited
@ -270,7 +291,7 @@ impl<'conn, 'a> Tx<'conn, 'a> {
bail!(ErrorKind::NotYetImplemented(format!("Cannot resolve value lookup ref for attribute {} that is not :db/valueType :db.type/ref", a)))
}
Either::Right(LookupRefOrTempId::LookupRef(intern_lookup_ref(&mut lookup_refs, lookup_ref)?))
Either::Right(LookupRefOrTempId::LookupRef(in_process.intern_lookup_ref(lookup_ref)?))
},
entmod::AtomOrLookupRefOrVectorOrMapNotation::Vector(vs) => {
@ -306,7 +327,7 @@ impl<'conn, 'a> Tx<'conn, 'a> {
// to use for upserting. This tempid will not be reported in the TxReport.
let db_id: Option<entmod::EntidOrLookupRefOrTempId> = mentat_tx_parser::remove_db_id(&mut map_notation)?;
let mut dangling = db_id.is_none();
let db_id: entmod::EntidOrLookupRefOrTempId = db_id.unwrap_or_else(&mut allocate_mentat_id);
let db_id: entmod::EntidOrLookupRefOrTempId = db_id.unwrap_or_else(|| in_process.allocate_mentat_id());
// We're nested, so we want to ensure we're not creating "dangling"
// entities that can't be reached. If we're :db/isComponent, then this
@ -357,11 +378,11 @@ impl<'conn, 'a> Tx<'conn, 'a> {
},
entmod::EntidOrLookupRefOrTempId::TempId(e) => {
Either::Right(LookupRefOrTempId::TempId(temp_ids.intern(e)))
Either::Right(LookupRefOrTempId::TempId(in_process.intern_temp_id(e)))
},
entmod::EntidOrLookupRefOrTempId::LookupRef(ref lookup_ref) => {
Either::Right(LookupRefOrTempId::LookupRef(intern_lookup_ref(&mut lookup_refs, lookup_ref)?))
Either::Right(LookupRefOrTempId::LookupRef(in_process.intern_lookup_ref(lookup_ref)?))
},
}
},
@ -377,11 +398,11 @@ impl<'conn, 'a> Tx<'conn, 'a> {
},
entmod::EntidOrLookupRefOrTempId::TempId(e) => {
Either::Right(LookupRefOrTempId::TempId(temp_ids.intern(e)))
Either::Right(LookupRefOrTempId::TempId(in_process.intern_temp_id(e)))
},
entmod::EntidOrLookupRefOrTempId::LookupRef(ref lookup_ref) => {
Either::Right(LookupRefOrTempId::LookupRef(intern_lookup_ref(&mut lookup_refs, lookup_ref)?))
Either::Right(LookupRefOrTempId::LookupRef(in_process.intern_lookup_ref(lookup_ref)?))
},
};
@ -389,7 +410,7 @@ impl<'conn, 'a> Tx<'conn, 'a> {
},
}
};
Ok((terms, temp_ids, lookup_refs))
Ok((terms, in_process.temp_ids, in_process.lookup_refs))
}
/// Pipeline stage 2: rewrite `Term` instances with lookup refs into `Term` instances without