143 lines
2.5 KiB
Go
143 lines
2.5 KiB
Go
package schema
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import (
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"fmt"
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"reflect"
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"sync"
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)
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type Tables struct {
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dialect Dialect
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tables sync.Map
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mu sync.RWMutex
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seen map[reflect.Type]*Table
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inProgress map[reflect.Type]*tableInProgress
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}
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func NewTables(dialect Dialect) *Tables {
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return &Tables{
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dialect: dialect,
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seen: make(map[reflect.Type]*Table),
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inProgress: make(map[reflect.Type]*tableInProgress),
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}
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}
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func (t *Tables) Register(models ...interface{}) {
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for _, model := range models {
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_ = t.Get(reflect.TypeOf(model).Elem())
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}
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}
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func (t *Tables) Get(typ reflect.Type) *Table {
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return t.table(typ, false)
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}
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func (t *Tables) InProgress(typ reflect.Type) *Table {
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return t.table(typ, true)
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}
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func (t *Tables) table(typ reflect.Type, allowInProgress bool) *Table {
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typ = indirectType(typ)
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if typ.Kind() != reflect.Struct {
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panic(fmt.Errorf("got %s, wanted %s", typ.Kind(), reflect.Struct))
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}
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if v, ok := t.tables.Load(typ); ok {
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return v.(*Table)
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}
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t.mu.Lock()
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if v, ok := t.tables.Load(typ); ok {
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t.mu.Unlock()
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return v.(*Table)
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}
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var table *Table
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inProgress := t.inProgress[typ]
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if inProgress == nil {
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table = newTable(t.dialect, typ, t.seen, false)
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inProgress = newTableInProgress(table)
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t.inProgress[typ] = inProgress
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} else {
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table = inProgress.table
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}
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t.mu.Unlock()
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if allowInProgress {
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return table
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}
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if !inProgress.init() {
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return table
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}
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t.mu.Lock()
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delete(t.inProgress, typ)
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t.tables.Store(typ, table)
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t.mu.Unlock()
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t.dialect.OnTable(table)
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for _, field := range table.FieldMap {
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if field.UserSQLType == "" {
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field.UserSQLType = field.DiscoveredSQLType
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}
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if field.CreateTableSQLType == "" {
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field.CreateTableSQLType = field.UserSQLType
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}
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}
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return table
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}
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func (t *Tables) ByModel(name string) *Table {
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var found *Table
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t.tables.Range(func(key, value interface{}) bool {
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t := value.(*Table)
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if t.TypeName == name {
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found = t
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return false
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}
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return true
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})
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return found
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}
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func (t *Tables) ByName(name string) *Table {
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var found *Table
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t.tables.Range(func(key, value interface{}) bool {
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t := value.(*Table)
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if t.Name == name {
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found = t
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return false
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}
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return true
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})
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return found
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}
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type tableInProgress struct {
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table *Table
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initOnce sync.Once
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}
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func newTableInProgress(table *Table) *tableInProgress {
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return &tableInProgress{
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table: table,
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}
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}
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func (inp *tableInProgress) init() bool {
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var inited bool
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inp.initOnce.Do(func() {
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inp.table.init()
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inited = true
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})
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return inited
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}
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