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// Copyright (c) 2018-present Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
package app
import (
"github.com/mattermost/mattermost-server/mlog"
"github.com/mattermost/mattermost-server/model"
)
// Registers a given function to be called when the cluster leader may have changed. Returns a unique ID for the
// listener which can later be used to remove it. If clustering is not enabled in this build, the callback will never
// be called.
func (a *App) AddClusterLeaderChangedListener(listener func()) string {
id := model.NewId()
a.clusterLeaderListeners.Store(id, listener)
return id
}
// Removes a listener function by the unique ID returned when AddConfigListener was called
func (a *App) RemoveClusterLeaderChangedListener(id string) {
a.clusterLeaderListeners.Delete(id)
}
func (a *App) InvokeClusterLeaderChangedListeners() {
mlog.Info("Cluster leader changed. Invoking ClusterLeaderChanged listeners.")
a.Go(func() {
a.clusterLeaderListeners.Range(func(_, listener interface{}) bool {
listener.(func())()
return true
})
})
}
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