org.jetbrains.kotlin.utils.concurrent.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2015 JetBrains s.r.o.
*
* 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 org.jetbrains.kotlin.utils.concurrent.block
class LockedClearableLazyValue(val lock: Any, val init: () -> T) {
@Volatile private var value: T? = null
fun get(): T {
val _v1 = value
if (_v1 != null) {
return _v1
}
return synchronized(lock) {
val _v2 = value
// Suppress because of https://youtrack.jetbrains.com/issue/KT-6176
@Suppress("UNNECESSARY_NOT_NULL_ASSERTION")
if (_v2 != null) {
_v2!!
}
else {
val _v3 = init()
this.value = _v3
_v3
}
}
}
fun drop() {
synchronized (lock) {
value = null
}
}
}