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rejected_execution_handler_only_log.go
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rejected_execution_handler_only_log.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 handler
import (
"sync"
)
import (
"dubbo.apache.org/dubbo-go/v3/common"
"dubbo.apache.org/dubbo-go/v3/common/constant"
"dubbo.apache.org/dubbo-go/v3/common/extension"
"dubbo.apache.org/dubbo-go/v3/common/logger"
"dubbo.apache.org/dubbo-go/v3/filter"
"dubbo.apache.org/dubbo-go/v3/protocol"
)
const (
// HandlerName handler name
HandlerName = "log"
)
func init() {
// this implementation is the the default implementation of RejectedExecutionHandler
extension.SetRejectedExecutionHandler(HandlerName, GetOnlyLogRejectedExecutionHandler)
extension.SetRejectedExecutionHandler(constant.DefaultKey, GetOnlyLogRejectedExecutionHandler)
}
var (
onlyLogHandlerInstance *OnlyLogRejectedExecutionHandler
onlyLogHandlerOnce sync.Once
)
// OnlyLogRejectedExecutionHandler implements the RejectedExecutionHandler
/**
* This implementation only logs the invocation info.
* it always return en error inside the result.
* "UserProvider":
* registry: "hangzhouzk"
* protocol : "dubbo"
* interface : "com.ikurento.user.UserProvider"
* ... # other configuration
* tps.limiter: "method-service" # the name of limiter
* tps.limit.rejected.handler: "default" or "log"
* methods:
* - name: "GetUser"
* OnlyLogRejectedExecutionHandler is designed to be singleton
*/
type OnlyLogRejectedExecutionHandler struct{}
// RejectedExecution will do nothing, it only log the invocation.
func (handler *OnlyLogRejectedExecutionHandler) RejectedExecution(url *common.URL,
_ protocol.Invocation) protocol.Result {
logger.Errorf("The invocation was rejected. url: %s", url.String())
return &protocol.RPCResult{}
}
// GetOnlyLogRejectedExecutionHandler will return the instance of OnlyLogRejectedExecutionHandler
func GetOnlyLogRejectedExecutionHandler() filter.RejectedExecutionHandler {
onlyLogHandlerOnce.Do(func() {
onlyLogHandlerInstance = &OnlyLogRejectedExecutionHandler{}
})
return onlyLogHandlerInstance
}