c74fcbf282
Since caching all subject data proved too complex in the time available, this implementation uses a simple key/value lookup table to cache subject names and perform backward searches by uid.
112 lines
2 KiB
Go
112 lines
2 KiB
Go
package entity
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import (
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"strings"
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"sync"
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"github.com/photoprism/photoprism/pkg/sanitize"
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)
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// Strings is a simple string map that should not be accessed by multiple goroutines.
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type Strings map[string]string
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// StringMap is a string (reverse) lookup map that can be accessed by multiple goroutines.
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type StringMap struct {
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sync.RWMutex
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m Strings
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r Strings
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}
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// NewStringMap creates a new string (reverse) lookup map.
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func NewStringMap(s Strings) *StringMap {
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if s == nil {
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return &StringMap{m: make(Strings, 64), r: make(Strings, 64)}
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} else {
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m := &StringMap{m: s, r: make(Strings, len(s))}
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for k := range s {
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m.r[strings.ToLower(s[k])] = k
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}
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return m
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}
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}
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// Get returns a string from the map, empty if not found.
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func (s *StringMap) Get(key string) string {
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if key == "" {
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return ""
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}
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s.RLock()
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defer s.RUnlock()
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return s.m[key]
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}
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// Key returns a string from the map, empty if not found.
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func (s *StringMap) Key(val string) string {
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if val == "" {
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return ""
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}
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s.RLock()
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defer s.RUnlock()
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return s.r[strings.ToLower(val)]
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}
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// Log returns a string sanitized for logging and using the key as fallback value.
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func (s *StringMap) Log(key string) (val string) {
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if val = s.Get(key); val != "" {
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return sanitize.Log(val)
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} else {
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return sanitize.Log(key)
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}
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}
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// Unchanged verifies if the key/value pair is unchanged.
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func (s *StringMap) Unchanged(key string, val string) bool {
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if key == "" {
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return true
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}
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s.RLock()
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defer s.RUnlock()
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return s.m[key] == val && s.r[strings.ToLower(val)] == key
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}
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// Set adds a string to the map.
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func (s *StringMap) Set(key string, val string) {
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if s.Unchanged(key, val) {
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return
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} else if val == "" {
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s.Unset(key)
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return
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}
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s.Lock()
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defer s.Unlock()
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s.m[key] = val
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s.r[strings.ToLower(val)] = key
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}
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// Unset removes a string from the map.
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func (s *StringMap) Unset(key string) {
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if key == "" {
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return
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}
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s.Lock()
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defer s.Unlock()
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if v := s.m[key]; v == "" {
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// Should never happen.
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} else if v = strings.ToLower(v); s.r[v] == key {
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delete(s.r, v)
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}
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delete(s.m, key)
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}
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