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protocol.go
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protocol.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 protocol
import (
"sync"
)
import (
"github.com/apache/dubbo-go/common"
"github.com/apache/dubbo-go/common/logger"
)
// Protocol
// Extension - protocol
type Protocol interface {
Export(invoker Invoker) Exporter
Refer(url common.URL) Invoker
Destroy()
}
// Exporter
// wrapping invoker
type Exporter interface {
GetInvoker() Invoker
Unexport()
}
/////////////////////////////
// base protocol
/////////////////////////////
// BaseProtocol ...
type BaseProtocol struct {
exporterMap *sync.Map
invokers []Invoker
}
// NewBaseProtocol ...
func NewBaseProtocol() BaseProtocol {
return BaseProtocol{
exporterMap: new(sync.Map),
}
}
// SetExporterMap ...
func (bp *BaseProtocol) SetExporterMap(key string, exporter Exporter) {
bp.exporterMap.Store(key, exporter)
}
// ExporterMap ...
func (bp *BaseProtocol) ExporterMap() *sync.Map {
return bp.exporterMap
}
// SetInvokers ...
func (bp *BaseProtocol) SetInvokers(invoker Invoker) {
bp.invokers = append(bp.invokers, invoker)
}
// Invokers ...
func (bp *BaseProtocol) Invokers() []Invoker {
return bp.invokers
}
// Export ...
func (bp *BaseProtocol) Export(invoker Invoker) Exporter {
return NewBaseExporter("base", invoker, bp.exporterMap)
}
// Refer ...
func (bp *BaseProtocol) Refer(url common.URL) Invoker {
return NewBaseInvoker(url)
}
// Destroy will destroy all invoker and exporter, so it only is called once.
func (bp *BaseProtocol) Destroy() {
// destroy invokers
for _, invoker := range bp.invokers {
if invoker != nil {
invoker.Destroy()
}
}
bp.invokers = []Invoker{}
// unexport exporters
bp.exporterMap.Range(func(key, exporter interface{}) bool {
if exporter != nil {
exporter.(Exporter).Unexport()
} else {
bp.exporterMap.Delete(key)
}
return true
})
}
/////////////////////////////
// base exporter
/////////////////////////////
// BaseExporter ...
type BaseExporter struct {
key string
invoker Invoker
exporterMap *sync.Map
}
// NewBaseExporter ...
func NewBaseExporter(key string, invoker Invoker, exporterMap *sync.Map) *BaseExporter {
return &BaseExporter{
key: key,
invoker: invoker,
exporterMap: exporterMap,
}
}
// GetInvoker ...
func (de *BaseExporter) GetInvoker() Invoker {
return de.invoker
}
// Unexport ...
func (de *BaseExporter) Unexport() {
logger.Infof("Exporter unexport.")
de.invoker.Destroy()
de.exporterMap.Delete(de.key)
}