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type_cache.go
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/
type_cache.go
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package pg
import (
"github.com/jackc/pgtype"
"sync"
)
// typeCache caches a map from a Postgres pg_type.oid to a Type.
type typeCache struct {
types map[pgtype.OID]Type
mu *sync.Mutex
}
func newTypeCache() *typeCache {
m := make(map[pgtype.OID]Type, len(defaultKnownTypes))
for oid, typ := range defaultKnownTypes {
m[oid] = typ
}
return &typeCache{
types: m,
mu: &sync.Mutex{},
}
}
// getOIDs returns the cached OIDS (with the type) and uncached OIDs.
func (tc *typeCache) getOIDs(oids ...uint32) (map[pgtype.OID]Type, map[pgtype.OID]struct{}) {
cachedTypes := make(map[pgtype.OID]Type, len(oids))
uncachedTypes := make(map[pgtype.OID]struct{}, len(oids))
tc.mu.Lock()
defer tc.mu.Unlock()
for _, oid := range oids {
if t, ok := tc.types[pgtype.OID(oid)]; ok {
cachedTypes[pgtype.OID(oid)] = t
} else {
uncachedTypes[pgtype.OID(oid)] = struct{}{}
}
}
return cachedTypes, uncachedTypes
}
func (tc *typeCache) getOID(oid uint32) (Type, bool) {
tc.mu.Lock()
typ, ok := tc.types[pgtype.OID(oid)]
tc.mu.Unlock()
return typ, ok
}
func (tc *typeCache) addType(typ Type) {
tc.mu.Lock()
tc.types[typ.OID()] = typ
tc.mu.Unlock()
}