android+对象池使用,android中使用对象池 ----- Pools

最新推荐文章于 2022-05-31 22:37:37 发布

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最新推荐文章于 2022-05-31 22:37:37 发布

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文章标签： android+对象池使用

最近在做音频直播间的优化，发现Socket聊天部分，接收到的信息，传递到adapter中时，总是new一个对象，再把信息数据封装进去传递给adapter。

这时候想这个new对象的动作其实是可以优化，试想直播间的聊天吹水是多么频繁，2000多号人在直播间聊天的时候，刷刷刷的满屏滚动的聊天信息，不停的new对象，给GC带来的压力可想而知。

所以搜了一下关于对象池方面的资料，记录如下：

1、Apache Commons-pool2

一开始搜索到这个common pool2框架，在Eclipse跑了下demo，发现还蛮不错的，很多配置属性，可控制；

可惜，移植到android上时，TMD不能用….因为pool2使用了JMX，而android虚拟机中没有jmx….大写的尴尬！

不能用归不能用了，笔记还是记下，也许哪天就可以用上了：

Apache Commons-pool2简记

2.Pools

上面的common-pool2不能用后，又搜索了解android方面的对象池资料，发现其实android自己就有pools工具类，在android.support.v4.util.Pools。

Pools源码很简短：

/** * Helper class for creating pools of objects. An example use looks like this: *

 * public class MyPooledClass {//官方Pools使用demo * * private static final SynchronizedPool sPool = * new SynchronizedPool(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); * } * * . . . * } *

* */

public final class Pools {

/** * Interface for managing a pool of objects. * * @param The pooled type. */

public static interface Pool {

/** * @return An instance from the pool if such, null otherwise. */

public T acquire();//获取对象

/** * 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. */

public boolean release(T instance);//释放对象

}

private Pools() {

/* do nothing - hiding constructor */

}

/** * Simple (non-synchronized) pool of objects. * * @param The pooled type. */

public static class SimplePool implements Pool {

private final Object[] mPool;

private int mPoolSize;

/** * Creates a new instance. * * @param maxPoolSize The max pool size. * * @throws IllegalArgumentException If the max pool size is less than zero. */

public SimplePool(int maxPoolSize) {

if (maxPoolSize <= 0) {

throw new IllegalArgumentException("The max pool size must be > 0");

}

mPool = new Object[maxPoolSize];

}

@Override

@SuppressWarnings("unchecked")

public T acquire() {

if (mPoolSize > 0) {

final int lastPooledIndex = mPoolSize - 1;

T instance = (T) mPool[lastPooledIndex];

mPool[lastPooledIndex] = null;

mPoolSize--;

return instance;

}

return null;

}

@Override

public boolean release(T instance) {

if (isInPool(instance)) {

throw new IllegalStateException("Already in the pool!");

}

if (mPoolSize < mPool.length) {

mPool[mPoolSize] = instance;

mPoolSize++;

return true;

}

return false;

}

private boolean isInPool(T instance) {

for (int i = 0; i < mPoolSize; i++) {

if (mPool[i] == instance) {

return true;

}

return false;

}

/** * Synchronized) pool of objects. * * @param The pooled type. */

public static class SynchronizedPool extends SimplePool {

private final Object mLock = new Object();

/** * Creates a new instance. * * @param maxPoolSize The max pool size. * * @throws IllegalArgumentException If the max pool size is less than zero. */

public SynchronizedPool(int maxPoolSize) {

super(maxPoolSize);

}

@Override

public T acquire() {

synchronized (mLock) {

return super.acquire();

}

@Override

public boolean release(T element) {

synchronized (mLock) {

return super.release(element);