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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 extension
import (
"sync"
)
import (
"github.com/apache/dubbo-go/common/logger"
"github.com/apache/dubbo-go/common/observer"
)
var (
globalEventDispatcher observer.EventDispatcher
initEventListeners []func() observer.EventListener
initEventOnce sync.Once
)
var (
dispatchers = make(map[string]func() observer.EventDispatcher, 8)
)
// SetEventDispatcher, actually, it doesn't really init the global dispatcher
func SetEventDispatcher(name string, v func() observer.EventDispatcher) {
dispatchers[name] = v
}
// SetAndInitGlobalDispatcher will actually init the global dispatcher
// if there is already a global dispatcher,
// it will be override
// if the dispatcher with the name not found, it will panic
func SetAndInitGlobalDispatcher(name string) {
if len(name) == 0 {
name = "direct"
}
if globalEventDispatcher != nil {
logger.Warnf("EventDispatcher has been initialized. It will be replaced")
}
if dp, ok := dispatchers[name]; !ok || dp == nil {
panic("EventDispatcher for " + name + " is not found, make sure you have import the package, " +
"like import _ github.com/apache/dubbo-go/common/observer/dispatcher ")
}
globalEventDispatcher = dispatchers[name]()
}
// GetGlobalDispatcher will init all listener and then return dispatcher
func GetGlobalDispatcher() observer.EventDispatcher {
initEventOnce.Do(func() {
// we should delay to add the listeners to avoid some listeners left
for _, l := range initEventListeners {
globalEventDispatcher.AddEventListener(l())
}
})
return globalEventDispatcher
}
// AddEventListener it will be added in global event dispatcher
func AddEventListener(creator func() observer.EventListener) {
initEventListeners = append(initEventListeners, creator)
}