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94 lines
2.5 KiB
Go
94 lines
2.5 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package config
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import (
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"strings"
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)
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type EventDispatcher struct {
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registry map[string][]EventHandler
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keyPrefix []string
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}
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func NewEventDispatcher() *EventDispatcher {
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return &EventDispatcher{
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registry: make(map[string][]EventHandler),
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keyPrefix: make([]string, 0),
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}
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}
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func (ed *EventDispatcher) Get(key string) []EventHandler {
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return ed.registry[formatKey(key)]
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}
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func (ed *EventDispatcher) Dispatch(event *Event) {
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var hs []EventHandler
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realKey := formatKey(event.Key)
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hs, ok := ed.registry[realKey]
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if !ok {
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for _, v := range ed.keyPrefix {
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if strings.HasPrefix(realKey, v) {
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if _, exist := ed.registry[v]; exist {
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hs = append(hs, ed.registry[v]...)
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}
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}
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}
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}
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for _, h := range hs {
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h.OnEvent(event)
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}
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}
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// register a handler to watch specific config changed
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func (ed *EventDispatcher) Register(key string, handler EventHandler) {
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key = formatKey(key)
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v, ok := ed.registry[key]
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if ok {
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ed.registry[key] = append(v, handler)
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} else {
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ed.registry[key] = []EventHandler{handler}
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}
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}
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// register a handler to watch specific config changed
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func (ed *EventDispatcher) RegisterForKeyPrefix(keyPrefix string, handler EventHandler) {
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keyPrefix = formatKey(keyPrefix)
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v, ok := ed.registry[keyPrefix]
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if ok {
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ed.registry[keyPrefix] = append(v, handler)
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} else {
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ed.registry[keyPrefix] = []EventHandler{handler}
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}
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ed.keyPrefix = append(ed.keyPrefix, keyPrefix)
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}
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func (ed *EventDispatcher) Unregister(key string, handler EventHandler) {
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key = formatKey(key)
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v, ok := ed.registry[key]
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if !ok {
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return
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}
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newGroup := make([]EventHandler, 0)
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for _, eh := range v {
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if eh.GetIdentifier() == handler.GetIdentifier() {
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continue
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}
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newGroup = append(newGroup, eh)
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}
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ed.registry[key] = newGroup
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}
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