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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 inmemory
import (
"sync"
)
import (
"github.com/emirpasic/gods/sets"
"github.com/emirpasic/gods/sets/treeset"
)
import (
"github.com/apache/dubbo-go/common"
"github.com/apache/dubbo-go/metadata/service"
)
// InMemoryMetadataService is store and query the metadata info in memory when each service registry
type MetadataService struct {
service.BaseMetadataService
exportedServiceURLs sync.Map
subscribedServiceURLs sync.Map
}
// urlComparator: defined as utils.Comparator for treeset to compare the URL
func urlComparator(a, b interface{}) int {
url1 := a.(common.URL)
url2 := b.(common.URL)
switch {
case url1.String() > url2.String():
return 1
case url1.String() < url2.String():
return -1
default:
return 0
}
}
// addURL: add URL in memory
func addURL(targetMap sync.Map, url common.URL) bool {
var (
urlSet interface{}
loaded bool
lock sync.RWMutex
)
if urlSet, loaded = targetMap.LoadOrStore(url.ServiceKey(), treeset.NewWith(urlComparator)); loaded {
lock.RLock()
if urlSet.(treeset.Set).Contains(url) {
lock.RUnlock()
return false
}
lock.RUnlock()
}
lock.Lock()
urlSet.(treeset.Set).Add(url)
lock.Unlock()
return true
}
// name...
func removeURL(targetMap sync.Map, url common.URL) string {
if value, loaded := targetMap.Load(url.ServiceKey()); loaded {
value.(treeset.Set).Remove(url)
if value.(treeset.Set).Empty() {
targetMap.Delete(url.ServiceKey())
}
}
}
// ExportURL: store the in memory treeset
func (mts *MetadataService) ExportURL(url common.URL) bool {
return addURL(mts.exportedServiceURLs, url)
}
func (MetadataService) UnexportURL(url common.URL) bool {
panic("implement me")
}
func (mts *MetadataService) SubscribeURL(url common.URL) bool {
return addURL(mts.subscribedServiceURLs, url)
}
func (MetadataService) UnsubscribeURL(url common.URL) bool {
panic("implement me")
}
func (MetadataService) PublishServiceDefinition(url common.URL) {
panic("implement me")
}
func (MetadataService) GetExportedURLs(serviceInterface string, group string, version string, protocol string) sets.Set {
panic("implement me")
}
func (MetadataService) GetServiceDefinition(interfaceName string, version string, group string) string {
panic("implement me")
}
func (MetadataService) GetServiceDefinitionByServiceKey(serviceKey string) string {
panic("implement me")
}