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sequence.go
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sequence.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package sequence
import (
"context"
"sync"
)
import (
"github.com/arana-db/arana/pkg/proto"
"github.com/arana-db/arana/pkg/runtime"
rcontext "github.com/arana-db/arana/pkg/runtime/context"
"github.com/arana-db/arana/pkg/util/log"
)
func init() {
proto.RegisterSequenceManager(newSequenceManager())
}
func newSequenceManager() proto.SequenceManager {
return &sequenceManager{
tenants: map[string]*tenantBucket{},
}
}
// SequenceManager uniform management of sequence manager
type sequenceManager struct {
lock sync.RWMutex
tenants map[string]*tenantBucket
}
type tenantBucket struct {
lock sync.RWMutex
schemas map[string]*schemaBucket
}
func (t *tenantBucket) getSchema(schema string) *schemaBucket {
t.lock.RLock()
defer t.lock.RUnlock()
return t.schemas[schema]
}
func (t *tenantBucket) getOrCreate(schema string) *schemaBucket {
t.lock.Lock()
defer t.lock.Unlock()
if _, ok := t.schemas[schema]; !ok {
t.schemas[schema] = &schemaBucket{
sequenceRegistry: map[string]proto.EnhancedSequence{},
}
}
return t.schemas[schema]
}
type schemaBucket struct {
lock sync.RWMutex
sequenceRegistry map[string]proto.EnhancedSequence
}
func (t *schemaBucket) getSequence(name string) (proto.Sequence, error) {
t.lock.RLock()
defer t.lock.RUnlock()
val, ok := t.sequenceRegistry[name]
if !ok {
return nil, proto.ErrorNotFoundSequence
}
return val, nil
}
func (t *schemaBucket) createIfAbsent(name string, f func() (proto.EnhancedSequence, error)) error {
t.lock.Lock()
defer t.lock.Unlock()
_, ok := t.sequenceRegistry[name]
if !ok {
val, err := f()
if err != nil {
return err
}
t.sequenceRegistry[name] = val
}
return nil
}
// CreateSequence creates one sequence instance
func (m *sequenceManager) CreateSequence(ctx context.Context, tenant, schema string, conf proto.SequenceConfig) (proto.Sequence, error) {
m.lock.Lock()
if _, ok := m.tenants[tenant]; !ok {
m.tenants[tenant] = &tenantBucket{
schemas: map[string]*schemaBucket{},
}
}
tbucket := m.tenants[tenant]
m.lock.Unlock()
sbucket := tbucket.getOrCreate(schema)
if val, _ := sbucket.getSequence(conf.Name); val != nil {
return val, nil
}
builder, ok := proto.GetSequenceSupplier(conf.Type)
if !ok {
log.Errorf("[sequence] name=%s not exist", conf.Type)
return nil, proto.ErrorNotSequenceType
}
if err := sbucket.createIfAbsent(conf.Name, func() (proto.EnhancedSequence, error) {
rt, err := runtime.Load(rcontext.Tenant(ctx), schema)
if err != nil {
log.Errorf("[sequence] load runtime.Runtime from schema=%s fail, %s", schema, err.Error())
return nil, err
}
sequence := builder()
ctx := context.WithValue(ctx, proto.RuntimeCtxKey{}, rt)
if err := sequence.Start(ctx, conf); err != nil {
log.Errorf("[sequence] type=%s name=%s start fail, %s", conf.Type, conf.Name, err.Error())
return nil, err
}
return sequence, nil
}); err != nil {
return nil, err
}
return sbucket.getSequence(conf.Name)
}
// GetSequence gets sequence instance by name
func (m *sequenceManager) GetSequence(ctx context.Context, tenant, schema, name string) (proto.Sequence, error) {
m.lock.RLock()
tbucket, ok := m.tenants[tenant]
m.lock.RUnlock()
if !ok {
return nil, proto.ErrorNotFoundSequence
}
sbucket := tbucket.getSchema(schema)
if sbucket == nil {
return nil, proto.ErrorNotFoundSequence
}
return sbucket.getSequence(name)
}