| /* |
| * 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 graceful_shutdown |
| |
| import ( |
| "context" |
| "sync" |
| ) |
| |
| import ( |
| "github.com/dubbogo/gost/log/logger" |
| ) |
| |
| import ( |
| "dubbo.apache.org/dubbo-go/v3/common/constant" |
| "dubbo.apache.org/dubbo-go/v3/common/extension" |
| "dubbo.apache.org/dubbo-go/v3/config" |
| "dubbo.apache.org/dubbo-go/v3/filter" |
| "dubbo.apache.org/dubbo-go/v3/protocol" |
| ) |
| |
| var ( |
| csfOnce sync.Once |
| csf *consumerGracefulShutdownFilter |
| ) |
| |
| func init() { |
| // `init()` is performed before config.Load(), so shutdownConfig will be retrieved after config was loaded. |
| extension.SetFilter(constant.GracefulShutdownConsumerFilterKey, func() filter.Filter { |
| return newConsumerGracefulShutdownFilter() |
| }) |
| |
| } |
| |
| type consumerGracefulShutdownFilter struct { |
| shutdownConfig *config.ShutdownConfig |
| } |
| |
| func newConsumerGracefulShutdownFilter() filter.Filter { |
| if csf == nil { |
| csfOnce.Do(func() { |
| csf = &consumerGracefulShutdownFilter{} |
| }) |
| } |
| return csf |
| } |
| |
| // Invoke adds the requests count and block the new requests if application is closing |
| func (f *consumerGracefulShutdownFilter) Invoke(ctx context.Context, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result { |
| f.shutdownConfig.ConsumerActiveCount.Inc() |
| return invoker.Invoke(ctx, invocation) |
| } |
| |
| // OnResponse reduces the number of active processes then return the process result |
| func (f *consumerGracefulShutdownFilter) OnResponse(ctx context.Context, result protocol.Result, invoker protocol.Invoker, invocation protocol.Invocation) protocol.Result { |
| f.shutdownConfig.ConsumerActiveCount.Dec() |
| return result |
| } |
| |
| func (f *consumerGracefulShutdownFilter) Set(name string, conf interface{}) { |
| switch name { |
| case constant.GracefulShutdownFilterShutdownConfig: |
| if shutdownConfig, ok := conf.(*config.ShutdownConfig); ok { |
| f.shutdownConfig = shutdownConfig |
| return |
| } |
| logger.Warnf("the type of config for {%s} should be *config.ShutdownConfig", constant.GracefulShutdownFilterShutdownConfig) |
| default: |
| // do nothing |
| } |
| } |