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locker.go
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locker.go
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// Copyright (c) 2019 Uber Technologies, Inc.
//
// Licensed 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 lifecyclemgr
import "sync"
// Lockable interface defines the operations that can be locked
type Lockable interface {
// LockKill locks kill operations including executor shutdown
LockKill()
// UnlockKill unlocks kill operations including executor shutdown
UnlockKill()
// LockLaunch locks launch operations
LockLaunch()
// UnlockLaunch unlocks launch operations
UnlockLaunch()
}
// lockState represents if API has no lock/ read lock or write lock
type lockState struct {
sync.RWMutex
// if first bit is set, it means kill ops are locked.
// if second bit is set, it means launch ops are locked.
state int
}
// LockKill locks kill operations including executor shutdown
func (l *lockState) LockKill() {
l.Lock()
defer l.Unlock()
l.state = l.state | 0x1
}
// LockLaunch locks launch operations
func (l *lockState) LockLaunch() {
l.Lock()
defer l.Unlock()
l.state = l.state | (0x1 << 1)
}
// UnlockKill unlocks kill operations including executor shutdown
func (l *lockState) UnlockKill() {
l.Lock()
defer l.Unlock()
l.state = l.state & (^0x1)
}
// UnlockLaunch unlocks launch operations
func (l *lockState) UnlockLaunch() {
l.Lock()
defer l.Unlock()
l.state = l.state & (^(0x1 << 1))
}
func (l *lockState) hasKillLock() bool {
l.RLock()
defer l.RUnlock()
return (l.state & 0x1) != 0
}
func (l *lockState) hasLaunchLock() bool {
l.RLock()
defer l.RUnlock()
return (l.state & (0x1 << 1)) != 0
}