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object_builder.go
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object_builder.go
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package stored
import (
"reflect"
"strconv"
"strings"
"sync"
"github.com/apple/foundationdb/bindings/go/src/fdb"
)
// ObjectBuilder is main interface to declare objects
type ObjectBuilder struct {
object *Object
waitInit sync.WaitGroup // waiter for main directory
waitAll sync.WaitGroup // waiter for all planned async operations
mux sync.Mutex
scheme schemeFull
}
func (ob *ObjectBuilder) panic(text string) {
panic("Stored error, object «" + ob.object.name + "» declaration: " + text)
}
func (ob *ObjectBuilder) buildScheme(schemeObj interface{}) {
t := reflect.TypeOf(schemeObj)
v := reflect.ValueOf(schemeObj)
if v.Kind() == reflect.Ptr {
t = t.Elem()
v = v.Elem()
}
o := ob.object
ob.mux.Lock()
o.reflectType = t
numfields := v.NumField()
o.immutableFields = map[string]*Field{}
o.mutableFields = map[string]*Field{}
primaryFields := []string{}
for i := 0; i < numfields; i++ {
field := Field{
object: o,
Num: i,
Type: t.Field(i),
Value: v.Field(i),
}
field.Kind = field.Value.Kind()
if field.Kind == reflect.Slice {
field.SubKind = field.Value.Type().Elem().Kind()
}
tag := field.ParseTag()
if tag != nil {
field.Name = tag.Name
if tag.AutoIncrement {
field.SetAutoIncrement()
}
if tag.Primary {
primaryFields = append(primaryFields, tag.Name)
//o.setPrimary(tag.Name)
//panic("not implemented yet")
}
if tag.UnStored {
field.UnStored = true
} else {
o.keysCount++
}
if tag.mutable {
o.mutableFields[tag.Name] = &field
field.mutable = true
} else {
if field.UnStored {
// Looks like an field is unstored, so it MUST be an mutable field, any way we would not write it anywhere
o.mutableFields[tag.Name] = &field
field.mutable = true
} else {
// Do we want to store id as immutable field? Looks like yes, due panics about it
o.immutableFields[tag.Name] = &field
}
}
// init unique field here, tmp disabled, need to test
//if tag.unique {
// ob.Unique(field.Name)
//}
}
}
ob.mux.Unlock()
if len(primaryFields) > 0 {
ob.Primary(primaryFields...)
}
return
}
func (ob *ObjectBuilder) addIndex(indexKey string) *Index {
o := ob.object
ob.mux.Lock()
_, ok := o.indexes[indexKey]
ob.mux.Unlock()
if ok {
ob.panic("already has index «" + indexKey + "»")
}
index := Index{
Name: indexKey,
object: o,
}
ob.waitAll.Add(1)
go func() {
ob.waitInit.Wait()
// at this point in time all index properties are probably set up and configured
indexSubspace, err := o.dir.CreateOrOpen(o.db, []string{indexKey}, nil)
if err != nil {
panic(err)
}
index.dir = indexSubspace
if index.needValueStore() {
indexSubspace, err = o.dir.CreateOrOpen(o.db, []string{indexKey, "value"}, nil)
if err != nil {
panic(err)
}
index.valueDir = indexSubspace
}
ob.mux.Lock()
o.indexes[indexKey] = &index
ob.mux.Unlock()
ob.waitAll.Done()
}()
return &index
}
func (ob *ObjectBuilder) addFieldIndex(fieldKeys []string) *Index {
ob.mux.Lock()
fields := make([]*Field, len(fieldKeys))
for k, keyName := range fieldKeys {
fields[k] = ob.object.field(keyName)
}
ob.mux.Unlock()
index := ob.addIndex(strings.Join(fieldKeys, ","))
index.fields = fields
return index
}
func (ob *ObjectBuilder) addGeoIndex(latKey, longKey, indexKey string) *Index {
ob.mux.Lock()
latField := ob.object.field(latKey)
longField := ob.object.field(longKey)
ob.mux.Unlock()
index := ob.addIndex(indexKey)
//index.field = field
index.fields = []*Field{latField, longField}
return index
}
func (ob *ObjectBuilder) need() {
o := ob.object
o.init()
res, err := o.db.ReadTransact(func(tr fdb.ReadTransaction) (interface{}, error) {
scheme := schemeFull{}
scheme.load(ob, o.miscDir, tr)
return scheme, nil
})
if err != nil {
ob.panic("could not read schema")
}
ob.mux.Lock()
ob.scheme = res.(schemeFull)
ob.mux.Unlock()
//fmt.Println("init -1")
ob.waitInit.Done()
//fmt.Println("all -1")
ob.waitAll.Done()
}
// Done will finish the object
func (ob *ObjectBuilder) Done() *Object {
ob.waitAll.Wait()
ob.scheme.buildCurrent(ob)
return ob.object
}
// Primary sets primary field in case it wasnot set with annotations
func (ob *ObjectBuilder) Primary(names ...string) *ObjectBuilder {
ob.mux.Lock()
for _, name := range names {
_ = ob.object.field(name)
}
//ob.object.setPrimary(names...)
o := ob.object
var name string
if len(names) == 1 {
name = names[0]
}
if o.primaryKey != "" {
for k, name := range names {
if o.primaryFields[k].Name != name {
o.panic("primary key already set to «" + o.primaryKey + "», could not set to «" + strings.Join(names, ", ") + "»")
}
}
o.panic("primary key already set to «" + o.primaryKey + "», could not set to «" + name + "»")
}
if len(names) > 1 {
o.primaryFields = []*Field{}
for _, rangeName := range names {
field := o.field(rangeName)
field.primary = true
o.primaryFields = append(o.primaryFields, field)
}
o.primaryKey = names[0]
o.multiplePrimary = true
} else {
o.primaryKey = name
field := o.field(name)
field.primary = true
o.primaryFields = []*Field{field}
}
ob.mux.Unlock()
ob.waitAll.Add(1)
//fmt.Println("all +1")
go func() {
ob.waitInit.Wait()
var err error
o.primary, err = o.dir.CreateOrOpen(o.db, names, nil)
if err != nil {
ob.panic(err.Error())
}
ob.waitAll.Done()
//fmt.Println("all -1")
}()
return ob
}
// IDDate is unique id generated using date as first part, this approach is usefull
// if date index necessary too
// field type should be int64
func (ob *ObjectBuilder) IDDate(fieldName string) *ObjectBuilder {
ob.mux.Lock()
field := ob.object.field(fieldName)
field.SetID(GenIDDate)
ob.mux.Unlock()
return ob
}
// IDRandom is unique id generated using random number, this approach is usefull
// if you whant randomly distribute objects, and you do not whant to unveil data object
func (ob *ObjectBuilder) IDRandom(fieldName string) *ObjectBuilder {
ob.mux.Lock()
field := ob.object.field(fieldName)
field.SetID(GenIDRandom)
ob.mux.Unlock()
return ob
}
// AutoIncrement make defined field autoincremented before adding new objects
//
func (ob *ObjectBuilder) AutoIncrement(name string) *ObjectBuilder {
ob.mux.Lock()
field := ob.object.field(name)
field.SetAutoIncrement()
ob.mux.Unlock()
return ob
}
// Unique index: if object with same field value already presented, Set and Add will return an ErrAlreadyExist
func (ob *ObjectBuilder) Unique(names ...string) *ObjectBuilder {
index := ob.addFieldIndex(names)
index.Unique = true
return ob
}
// UniqueOptional index: if object with same field value already presented, Set and Add will return an ErrAlreadyExist
// If the value is empty index do not set
func (ob *ObjectBuilder) UniqueOptional(names ...string) *ObjectBuilder {
index := ob.addFieldIndex(names)
index.Unique = true
index.optional = true
return ob
}
// Index add an simple index for specific key or set of keys
func (ob *ObjectBuilder) Index(names ...string) *ObjectBuilder {
ob.addFieldIndex(names)
return ob
}
// IndexOptional is the simple index which will be written only if field is not empty
func (ob *ObjectBuilder) IndexOptional(names ...string) *ObjectBuilder {
index := ob.addFieldIndex(names)
index.optional = true
return ob
}
// FastIndex will set index storing copy of object, performing denormalisation
func (ob *ObjectBuilder) FastIndex(names ...string) *ObjectBuilder {
ob.mux.Lock()
for _, name := range names {
_ = ob.object.field(name)
}
ob.mux.Unlock()
// init fast index here
return ob
}
// IndexGeo will add and geohash based index to allow geographicly search objects
// geoPrecision 0 means full precision:
// 10 < 1m, 9 ~ 7.5m, 8 ~ 21m, 7 ~ 228m, 6 ~ 1.8km, 5 ~ 7.2km, 4 ~ 60km, 3 ~ 234km, 2 ~ 1890km, 1 ~ 7500km
func (ob *ObjectBuilder) IndexGeo(latKey string, longKey string, geoPrecision int) *IndexGeo {
index := ob.addGeoIndex(latKey, longKey, latKey+","+longKey+":"+strconv.Itoa(geoPrecision))
if geoPrecision < 1 || geoPrecision > 12 {
geoPrecision = 12
}
index.Geo = geoPrecision
return &IndexGeo{index: index}
}
// IndexCustom add an custom index generated dynamicly using callback function
// custom indexes in an general way to implement any index on top of it
func (ob *ObjectBuilder) IndexCustom(key string, cb func(object interface{}) KeyTuple) *Index {
index := ob.addIndex(key)
index.handle = cb
return index
}
// IndexSearch will add serchable index which will allow
func (ob *ObjectBuilder) IndexSearch(key string, options ...IndexOption) *IndexSearch {
index := ob.addFieldIndex([]string{key})
field := ob.object.field(key)
if field.Kind != reflect.String {
ob.panic("field " + key + " should be string for IndexSearch")
}
for _, opt := range options {
index.SetOption(opt)
}
index.search = true
return &IndexSearch{index: index}
}
// Counter will count all objects with same value of passed fields
func (ob *ObjectBuilder) Counter(fieldNames ...string) *Counter {
fields := []*Field{}
ob.mux.Lock()
for _, fieldName := range fieldNames {
field := ob.object.field(fieldName)
fields = append(fields, field)
}
ob.mux.Unlock()
return counterNew(ob, fields)
}
// N2N Creates object to object relation between current object and other one.
// Other words it represents relations when unlimited number of host objects connected to unlimited
// amount of client objects
func (ob *ObjectBuilder) N2N(client *ObjectBuilder, name string) *Relation {
rel := Relation{name: name}
rel.init(RelationN2N, ob.object, client.object)
return &rel
}