jsMain.co.touchlab.stately.concurrency.AtomicReference.kt Maven / Gradle / Ivy

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/*
 * 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

/**
 * Multiplatform AtomicReference implementation
 */
actual class AtomicReference actual constructor(initialValue: V) {
    private var internalValue: V = initialValue

    /**
     * Compare current value with expected and set to new if they're the same. Note, 'compare' is checking
     * the actual object id, not 'equals'.
     */
    actual fun compareAndSet(expected: V, new: V): Boolean {
        return if (expected === internalValue) {
            internalValue = new
            true
        } else {
            false
        }
    }

    actual fun get(): V = internalValue

    actual fun set(value_: V) {
        internalValue = value_
    }
}