Android开发经验谈：并发编程（线程与线程池）（推荐）

//线程工厂
public class TaskThreadFactory implements ThreadFactory {
private final AtomicInteger mThreadNumber = new AtomicInteger(1);
private final String mNamePrefix;
TaskThreadFactory(String name) {
mNamePrefix = name + "#";
}
public Thread newThread(Runnable r) {
Thread t = new Thread(r,mNamePrefix + mThreadNumber.getAndIncrement());
//  if (t.isDaemon())
//   t.setDaemon(false);
//
//  if (t.getPriority() != Thread.NORM_PRIORITY)
//   t.setPriority(Thread.NORM_PRIORITY);
return t;
}
}
//重写runnable
public class PRunnable implements Runnable {
public static final int HIGH = 1;//优先级高
public static final int NORMAL = 2;//优先级中等
public static final int LOW = 3;//优先级低
@IntDef({HIGH,NORMAL,LOW})
@Retention(RetentionPolicy.SOURCE)
public @interface Priority{}
public final int priority;
private final Runnable runnable;
public int serial;
public PRunnable(Runnable runnable){
this(NORMAL,runnable);
}
public PRunnable(@Priority int priority,Runnable runnable){
this.priority = priority;
this.runnable = runnable;
}
@Override
public void run() {
if (runnable != null) {
runnable.run();
}
}
/**
* 线程队列方式 先进先出
* @param r1
* @param r2
* @return
*/
public static final int compareFIFO(PRunnable r1, PRunnable r2) {
int result = r1.priority-r2.priority;
return result==0?r1.serial-r2.serial:result;
}
/**
* 线程队列方式 后进先出
* @param r1
* @param r2
* @return
*/
public static final int compareLIFO(PRunnable r1, PRunnable r2) {
int result = r1.priority-r2.priority;
return result==0?r2.serial-r1.serial:result;
}
}
//线程池实现
public class TaskExecutor implements Executor {
private final static int QUEUE_INIT_CAPACITY = 20;
private static final int CORE = 3;
private static final int MAX = 5;
private static final int TIMEOUT = 30 * 1000;
private AtomicInteger SERIAL = new AtomicInteger(0);//主要获取添加任务
public static class Config {
public int core;
public int max;
public int timeout;
public boolean allowCoreTimeOut;
public boolean fifo;
public Config(int core, int max, int timeout, boolean allowCoreTimeOut,boolean fifo) {
this.core = core;
this.max = max;
this.timeout = timeout;
this.allowCoreTimeOut = allowCoreTimeOut;
this.fifo = fifo;
}
}
public static Config defaultConfig = new Config(CORE, MAX, TIMEOUT, true,true);
private final String name;
private final Config config;
private ExecutorService service;
public TaskExecutor(String name) {
this(name, defaultConfig);
}
public TaskExecutor(String name, Config config) {
this(name, config, true);
}
public TaskExecutor(String name, Config config, boolean startup) {
this.name = name;
this.config = config;
if (startup) {
startup();
}
}
public void startup() {
synchronized (this) {
if (service != null && !service.isShutdown()) {
return;
}
service = createExecutor(config);
}
}
public void shutdown() {
ExecutorService executor = null;
synchronized (this) {
// 交换变量
if (service != null) {
executor = service;
service = null;
}
}
if (executor != null) {
// 停止线程
if (!executor.isShutdown()) {
executor.shutdown();
}
// 回收变量
executor = null;
}
}
private void executeRunnable(PRunnable runnable) {
synchronized (this) {
if (service == null || service.isShutdown()) {
return;
}
runnable.serial = SERIAL.getAndIncrement();
service.execute(runnable);
}
}
@Override
public void execute(Runnable runnable) {
if (runnable instanceof PRunnable) {
executeRunnable((PRunnable) runnable);
}else{
executeRunnable(new PRunnable(runnable));
}
}
public Future<?  submit(Runnable runnable) {
synchronized (this) {
if (service == null || service.isShutdown()) {
return null;
}
if (runnable instanceof PRunnable) {
((PRunnable) runnable).serial = SERIAL.getAndIncrement();
return service.submit(runnable);
}else{
PRunnable pRunnable = new PRunnable(runnable);
pRunnable.serial = SERIAL.getAndIncrement();
return service.submit(pRunnable);
}
}
}
public void execute(Runnable runnable, @PRunnable.Priority int priority) {
executeRunnable(new PRunnable(priority,runnable));
}
private ExecutorService createExecutor(Config config) {
ThreadPoolExecutor service = new ThreadPoolExecutor(config.core, config.max, config.timeout,
TimeUnit.MILLISECONDS, new PriorityBlockingQueue<Runnable (QUEUE_INIT_CAPACITY, config.fifo ? mQueueFIFOComparator : mQueueLIFOComparator),
new TaskThreadFactory(name), new ThreadPoolExecutor.DiscardPolicy());
allowCoreThreadTimeOut(service, config.allowCoreTimeOut);
return service;
}
public boolean isBusy() {
synchronized (this) {
if (service == null || service.isShutdown()) {
return false;
}
if(service instanceof ThreadPoolExecutor){
ThreadPoolExecutor tService = (ThreadPoolExecutor) service;
return tService.getActiveCount()  = tService.getCorePoolSize();
}
return false;
}
}
private static final void allowCoreThreadTimeOut(ThreadPoolExecutor service, boolean value) {
if (Build.VERSION.SDK_INT  = 9) {
allowCoreThreadTimeOut9(service, value);
}
}
@TargetApi(9)
private static final void allowCoreThreadTimeOut9(ThreadPoolExecutor service, boolean value) {
service.allowCoreThreadTimeOut(value);
}
Comparator<Runnable  mQueueFIFOComparator = new Comparator<Runnable () {
@Override
public int compare(Runnable lhs, Runnable rhs) {
PRunnable r1 = (PRunnable) lhs;
PRunnable r2 = (PRunnable) rhs;
return PRunnable.compareFIFO(r1, r2);
}
};
Comparator<Runnable  mQueueLIFOComparator = new Comparator<Runnable () {
@Override
public int compare(Runnable lhs, Runnable rhs) {
PRunnable r1 = (PRunnable) lhs;
PRunnable r2 = (PRunnable) rhs;
return PRunnable.compareLIFO(r1, r2);
}
};
}