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Merge pull request #327 from xxjy/master
Memory thrashing problem.
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102 changes: 102 additions & 0 deletions
102
library/src/main/java/com/opensource/svgaplayer/utils/Pools.kt
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| @@ -0,0 +1,102 @@ | ||
| package com.opensource.svgaplayer.utils | ||
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| /** | ||
| * Helper class for creating pools of objects. An example use looks like this: | ||
| * <pre> | ||
| * public class MyPooledClass { | ||
| * | ||
| * private static final SynchronizedPool<MyPooledClass> sPool = | ||
| * new SynchronizedPool<MyPooledClass>(10); | ||
| * | ||
| * public static MyPooledClass obtain() { | ||
| * MyPooledClass instance = sPool.acquire(); | ||
| * return (instance != null) ? instance : new MyPooledClass(); | ||
| * } | ||
| * | ||
| * public void recycle() { | ||
| * // Clear state if needed. | ||
| * sPool.release(this); | ||
| * } | ||
| * | ||
| * . . . | ||
| * } | ||
| * </pre> | ||
| * | ||
| */ | ||
| class Pools private constructor() { | ||
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| /** | ||
| * Interface for managing a pool of objects. | ||
| * | ||
| * @param <T> The pooled type. | ||
| */ | ||
| interface Pool<T> { | ||
| /** | ||
| * @return An instance from the pool if such, null otherwise. | ||
| */ | ||
| fun acquire(): T? | ||
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| /** | ||
| * Release an instance to the pool. | ||
| * | ||
| * @param instance The instance to release. | ||
| * @return Whether the instance was put in the pool. | ||
| * | ||
| * @throws IllegalStateException If the instance is already in the pool. | ||
| */ | ||
| fun release(instance: T): Boolean | ||
| } | ||
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| /** | ||
| * Simple (non-synchronized) pool of objects. | ||
| * | ||
| * @param maxPoolSize The max pool size. | ||
| * | ||
| * @throws IllegalArgumentException If the max pool size is less than zero. | ||
| * | ||
| * @param <T> The pooled type. | ||
| */ | ||
| open class SimplePool<T>(maxPoolSize: Int) : Pool<T> { | ||
| private val mPool: Array<Any?> | ||
| private var mPoolSize = 0 | ||
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| init { | ||
| require(maxPoolSize > 0) { "The max pool size must be > 0" } | ||
| mPool = arrayOfNulls(maxPoolSize) | ||
| } | ||
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| @Suppress("UNCHECKED_CAST") | ||
| override fun acquire(): T? { | ||
| if (mPoolSize > 0) { | ||
| val lastPooledIndex = mPoolSize - 1 | ||
| val instance = mPool[lastPooledIndex] as T? | ||
| mPool[lastPooledIndex] = null | ||
| mPoolSize-- | ||
| return instance | ||
| } | ||
| return null | ||
| } | ||
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| override fun release(instance: T): Boolean { | ||
| check(!isInPool(instance)) { "Already in the pool!" } | ||
| if (mPoolSize < mPool.size) { | ||
| mPool[mPoolSize] = instance | ||
| mPoolSize++ | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
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| private fun isInPool(instance: T): Boolean { | ||
| for (i in 0 until mPoolSize) { | ||
| if (mPool[i] === instance) { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } | ||
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| } | ||
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| } |