69 lines
2.5 KiB
Go
69 lines
2.5 KiB
Go
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/**
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* Licensed to the Apache Software Foundation (ASF) 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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*/
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package detector
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import (
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mesos "github.com/mesos/mesos-go/mesosproto"
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)
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type MasterChanged interface {
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// Invoked when the master changes
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OnMasterChanged(*mesos.MasterInfo)
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}
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// AllMasters defines an optional interface that, if implemented by the same
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// struct as implements MasterChanged, will receive an additional callbacks
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// independently of leadership changes. it's possible that, as a result of a
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// leadership change, both the OnMasterChanged and UpdatedMasters callbacks
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// would be invoked.
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//
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// **NOTE:** Detector implementations are not required to support this optional
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// interface. Please RTFM of the detector implementation that you want to use.
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type AllMasters interface {
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// UpdatedMasters is invoked upon a change in the membership of mesos
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// masters, and is useful to clients that wish to know the entire set
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// of Mesos masters currently running.
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UpdatedMasters([]*mesos.MasterInfo)
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}
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// func/interface adapter
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type OnMasterChanged func(*mesos.MasterInfo)
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func (f OnMasterChanged) OnMasterChanged(mi *mesos.MasterInfo) {
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f(mi)
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}
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// An abstraction of a Master detector which can be used to
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// detect the leading master from a group.
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type Master interface {
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// Detect new master election. Every time a new master is elected, the
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// detector will alert the observer. The first call to Detect is expected
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// to kickstart any background detection processing (and not before then).
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// If detection startup fails, or the listener cannot be added, then an
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// error is returned.
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Detect(MasterChanged) error
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// returns a chan that, when closed, indicates the detector has terminated
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Done() <-chan struct{}
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// cancel the detector. it's ok to call this multiple times, or even if
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// Detect() hasn't been invoked yet.
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Cancel()
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}
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