93 lines
2.6 KiB
Kotlin
93 lines
2.6 KiB
Kotlin
/*
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* Copyright 2023 dorkbox, llc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dorkbox.objectPool.suspending
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import dorkbox.objectPool.Pool
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import dorkbox.objectPool.SuspendingPool
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import dorkbox.objectPool.SuspendingPoolObject
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import kotlinx.coroutines.runBlocking
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/**
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* A suspending pool of a specific size, where the entire pool is initially filled, and when the pool is empty,
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* a [Pool.take] will wait for a corresponding [Pool.put].
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*
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* @author dorkbox, llc
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*/
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internal class SuspendingPool<T> constructor(
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private val poolObject: SuspendingPoolObject<T>,
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size: Int,
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private val queue: SuspendingQueue<T>) : SuspendingPool<T> {
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init {
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runBlocking {
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for (x in 0 until size) {
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val e = newInstance()
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poolObject.onReturn(e)
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queue.offer(e)
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}
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}
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}
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/**
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* Takes an object from the pool, Suspends until an item is available in the pool.
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*
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* This method catches [InterruptedException] and discards it silently.
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*/
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override suspend fun take(): T {
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return try {
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takeInterruptibly()
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} catch (e: InterruptedException) {
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val newInstance = newInstance()
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poolObject.onTake(newInstance)
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newInstance
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}
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}
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/**
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* Takes an object from the pool, Suspends until an item is available in the pool.
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*
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* @throws InterruptedException
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*/
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override suspend fun takeInterruptibly(): T {
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val take = queue.take()
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poolObject.onTake(take)
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return take
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}
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/**
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* Return object to the pool, waking the threads that have suspended during take()
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*/
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override suspend fun put(`object`: T) {
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poolObject.onReturn(`object`)
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queue.put(`object`)
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}
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/**
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* @return a new object instance created by the pool.
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*/
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override suspend fun newInstance(): T {
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return poolObject.newInstance()
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}
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/**
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* Closes the supporting queue implementation
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*/
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override fun close() {
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queue.close()
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}
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}
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