dorkbox.util.sync.CountingLatch.kt Maven / Gradle / Ivy

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/*
 * Copyright 2023 dorkbox, llc
 *
 * 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.
 */
/*
 * Copyright 2018 Venkat Peri
 *
 * 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 dorkbox.util.sync

import kotlinx.coroutines.Job

/**
 * Like a [CountDownLatch] but the count can be increased via [countUp]. At zero, the latch will release.
 *
 * Once the latch is released, you must re-create this object to re-create the latch
 */
class CountingLatch(count: Int = 0, parent: Job? = null) : AbstractLatch(count, Trigger(count, true, parent)) {

    fun countDown() {
        trigger.decrement()
    }

    fun countUp() {
        trigger.increment()
    }
}