104 lines
2.9 KiB
Java
104 lines
2.9 KiB
Java
/*
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*
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* MIT License
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*
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* Copyright (c) 2020 TerraForged
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package com.terraforged.core.util.concurrent;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.function.Supplier;
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public class ObjectPool<T> {
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private final int capacity;
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private final List<Item<T>> pool;
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private final Supplier<? extends T> supplier;
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public ObjectPool(int size, Supplier<? extends T> supplier) {
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this.capacity = size;
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this.pool = new ArrayList<>(size);
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this.supplier = supplier;
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}
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public Item<T> get() {
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synchronized (pool) {
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if (pool.size() > 0) {
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return pool.remove(pool.size() - 1).retain();
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}
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}
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return new Item<>(supplier.get(), this);
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}
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public int size() {
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synchronized (pool) {
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return pool.size();
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}
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}
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private boolean restore(Item<T> item) {
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synchronized (pool) {
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int size = pool.size();
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if (size < capacity) {
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pool.add(item);
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return true;
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}
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}
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return false;
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}
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public static class Item<T> implements AutoCloseable {
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private final T value;
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private final ObjectPool<T> pool;
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private boolean released = false;
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private Item(T value, ObjectPool<T> pool) {
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this.value = value;
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this.pool = pool;
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}
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public T getValue() {
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return value;
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}
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public void release() {
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if (!released) {
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released = true;
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released = pool.restore(this);
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}
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}
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private Item<T> retain() {
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released = false;
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return this;
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}
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@Override
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public void close() {
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release();
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}
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}
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}
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