80 lines
2.4 KiB
Kotlin
80 lines
2.4 KiB
Kotlin
/*
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* Copyright 2020 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.nonBlocking
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import dorkbox.objectPool.Pool
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import dorkbox.objectPool.PoolObject
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import java.util.*
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import java.util.concurrent.ConcurrentLinkedQueue
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/**
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* A non-blocking pool which will grow as much as needed. If the pool is empty, new objects will be created. The items in the
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* pool will never expire or be automatically garbage collected. (see [ObjectPool.NonBlockingSoftReference] for pooled objects
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* that will expire/GC as needed).
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*
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* @author dorkbox, llc
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*/
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internal class NonBlockingPool<T>(
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private val poolObject: PoolObject<T>,
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private val queue: Queue<T> = ConcurrentLinkedQueue()) : Pool<T> {
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/**
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* Takes an object from the pool, Blocks 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 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, Blocks 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 fun takeInterruptibly(): T {
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var take = queue.poll()
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if (take == null) {
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take = poolObject.newInstance()
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}
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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 blocked during take()
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*/
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override fun put(`object`: T) {
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poolObject.onReturn(`object`)
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queue.offer(`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 fun newInstance(): T {
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return poolObject.newInstance()
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}
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}
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