commonMain.io.realm.kotlin.internal.NotificationToken.kt Maven / Gradle / Ivy

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Library code for Realm Kotlin. This artifact is not supposed to be consumed directly, but through 'io.realm.kotlin:gradle-plugin:1.11.1' instead.

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/*
 * Copyright 2020 Realm 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 io.realm.kotlin.internal

import io.realm.kotlin.internal.interop.RealmNativePointer
import io.realm.kotlin.notifications.internal.Cancellable
import kotlinx.atomicfu.AtomicBoolean
import kotlinx.atomicfu.atomic
import kotlinx.atomicfu.locks.reentrantLock
import kotlinx.atomicfu.locks.withLock

// Ideally, this should only support RealmNotificationTokenPointer and RealmCallbackTokenPointer
// But type erasure doesn't make that possible unless we use named constructors.
// Made public to be accessible from sync progress listener notifications
public class NotificationToken constructor(
    private val token: RealmNativePointer
) : Cancellable {

    private val lock = reentrantLock()
    private val observer: AtomicBoolean = atomic(true)

    override fun cancel() {
        lock.withLock {
            if (observer.value) {
                token.release()
            }
            observer.value = false
        }
    }

    // FIXME API We currently favor to do explicit registration.
    //  Only works on JVM. KN Cleaner is not available before v1.4.30-M1-eap-48
    //  https://github.com/realm/realm-kotlin/issues/23
    //  fun finalize() {
    //      cancel()
    //  }
}