// Copyright 2018 Shift Devices AG
//
// 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 locker

import "sync"

// Locker wraps a RWMutex with a nicer api.
type Locker struct {
	mutex sync.RWMutex
}

// Lock wraps RWMutex.Lock, returning a function to unlock. Usage: `defer locker.Lock()()`.
func (locker *Locker) Lock() func() {
	locker.mutex.Lock()
	return locker.mutex.Unlock
}

// RLock wraps RWMutex.RLock, returning a function to unlock. Usage: `defer locker.RLock()()`.
func (locker *Locker) RLock() func() {
	locker.mutex.RLock()
	return locker.mutex.RUnlock
}
