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extended cache comments

This commit is contained in:
James Bardin 2020-10-14 12:28:06 -04:00
parent bb76c3b50c
commit e27ecba6e4
1 changed files with 7 additions and 1 deletions
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8
configs/configschema/decoder_spec.go
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@ -17,6 +17,12 @@ var mapLabelNames = []string{"key"}
// Caching these externally rather than within the struct is required because // Caching these externally rather than within the struct is required because
// Blocks are used by value and copied when working with NestedBlocks, and the // Blocks are used by value and copied when working with NestedBlocks, and the
// copying of the value prevents any safe synchronisation of the struct itself. // copying of the value prevents any safe synchronisation of the struct itself.
//
// While we are using the *Block pointer as the cache key, and the Block
// contents are mutable, once a Block is created it is treated as immutable for
// the duration of its life. Because a Block is a representation of a logical
// schema, which cannot change while it's being used, any modifications to the
// schema during execution would be an error.
type specCache struct { type specCache struct {
sync.Mutex sync.Mutex
specs map[uintptr]hcldec.Spec specs map[uintptr]hcldec.Spec
@ -26,7 +32,7 @@ var decoderSpecCache = specCache{
specs: map[uintptr]hcldec.Spec{}, specs: map[uintptr]hcldec.Spec{},
} }
// get returns the Spec associated with the given Block, or nil if none is // get returns the Spec associated with eth given Block, or nil if non is
// found. // found.
func (s *specCache) get(b *Block) hcldec.Spec { func (s *specCache) get(b *Block) hcldec.Spec {
s.Lock() s.Lock()