org.jetbrains.kotlin.builtins.BuiltInsInitializer.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.builtins
import org.jetbrains.kotlin.utils.sure
class BuiltInsInitializer(
private val constructor: () -> T
) {
@Volatile private var instance: T? = null
@Volatile private var initializing: Boolean = false
private var initializationFailed: Throwable? = null
@Synchronized private fun initialize() {
if (instance == null) {
if (initializationFailed != null) {
throw IllegalStateException(
"Built-in library initialization failed previously: " + initializationFailed!!, initializationFailed)
}
if (initializing) {
throw IllegalStateException("Built-in library initialization loop")
}
initializing = true
try {
instance = constructor()
}
catch (e: Throwable) {
initializationFailed = e
throw IllegalStateException("Built-in library initialization failed. " + "Please ensure you have kotlin-runtime.jar in the classpath: " + e, e)
}
finally {
initializing = false
}
}
}
fun get(): T {
if (initializing) {
synchronized (this) {
return instance.sure {
"Built-ins are not initialized (note: We are under the same lock as initializing and instance)"
}
}
}
if (instance == null) {
initialize()
}
return instance!!
}
}