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