nativeCommonMain.co.touchlab.stately.concurrency.ThreadLocal.kt Maven / Gradle / Ivy

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// ktlint-disable filename
/*
 * Copyright (C) 2018 Touchlab, 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 co.touchlab.stately.concurrency

actual open class ThreadLocalRef actual constructor() {
    private val threadLocalId = ThreadLocalIdCounter.nextThreadLocalId()

    actual fun remove() {
        ThreadLocalState.threadLocalMap.remove(threadLocalId)
    }

    actual fun get(): T? {
        return if (ThreadLocalState.threadLocalMap.containsKey(threadLocalId)) {
            ThreadLocalState.threadLocalMap.get(threadLocalId) as T
        } else {
            null
        }
    }

    actual fun set(value: T?) {
        if (value == null) {
            remove()
        } else {
            ThreadLocalState.threadLocalMap.put(threadLocalId, value)
        }
    }
}

@ThreadLocal
private object ThreadLocalState {
    val threadLocalMap = HashMap()
}

private object ThreadLocalIdCounter {
    val threadLocalId = AtomicInt(0)
    fun nextThreadLocalId(): Int = threadLocalId.addAndGet(1)
}