{"id":2807,"date":"2022-04-18T15:20:06","date_gmt":"2022-04-18T07:20:06","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=2807"},"modified":"2022-04-18T15:20:06","modified_gmt":"2022-04-18T07:20:06","slug":"%e5%bb%b6%e6%97%b6%e9%98%9f%e5%88%97%e7%9a%84%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=2807","title":{"rendered":"\u5ef6\u65f6\u961f\u5217\u7684\u539f\u7406"},"content":{"rendered":"\n

\u5148\u8bf4\u4e00\u4e0b\u5ef6\u65f6\u961f\u5217\u7684\u573a\u666f\uff0c\u6709\u7684\u65f6\u5019\u9700\u8981\u5728\u4e00\u6bb5\u65f6\u95f4\u4e4b\u540e\uff0c\u5904\u7406\u4e8b\u60c5\uff0c\u8fd9\u4e2a\u5904\u7406\u9700\u8981\u6bd4\u8f83\u53ca\u65f6\u3002\u5047\u8bbe\u626b\u8868\u5408\u9002\u4f7f\u7528\u5b9a\u65f6\u5668\u7684\u8bdd\uff0c\u90fd\u4f1a\u5b58\u5728\u4e00\u5b9a\u7684\u65f6\u6548\u6027\u95ee\u9898\uff0c\u8fd9\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528\u5ef6\u65f6\u961f\u5217\u3002<\/p>\n\n\n\n

\u53c2\u8003\uff1a(26\u6761\u6d88\u606f) \u5ef6\u8fdf\u961f\u5217DelayQueue\u539f\u7406_\u5916\u661f\u55b5\u7684\u535a\u5ba2-CSDN\u535a\u5ba2_delayqueue<\/a><\/p>\n\n\n\n

DelayQueue \u662f\u4e00\u4e2a\u901a\u8fc7PriorityBlockingQueue<\/a>\u5b9e\u73b0\u5ef6\u8fdf\u83b7\u53d6\u5143\u7d20\u7684\u65e0\u754c\u961f\u5217\u65e0\u754c\u963b\u585e\u961f\u5217\uff0c\u5176\u4e2d\u6dfb\u52a0\u8fdb\u8be5\u961f\u5217\u7684\u5143\u7d20\u5fc5\u987b\u5b9e\u73b0Delayed\u63a5\u53e3\uff08\u6307\u5b9a\u5ef6\u8fdf\u65f6\u95f4\uff09\uff0c\u800c\u4e14\u53ea\u6709\u5728\u5ef6\u8fdf\u671f\u6ee1\u540e\u624d\u80fd\u4ece\u4e2d\u63d0\u53d6\u5143\u7d20\u3002<\/p>\n\n\n\n

\u4ec0\u4e48\u662fPriorityBlockingQueue\uff08\u4f18\u5148\u961f\u5217\uff09
PriorityBlockingQueue\u662f\u4e00\u4e2a\u652f\u6301\u4f18\u5148\u7ea7\u7684\u65e0\u754c\u963b\u585e\u961f\u5217\uff0c\u961f\u5217\u7684\u5143\u7d20\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u5143\u7d20\u91c7\u7528\u81ea\u7136\u987a\u5e8f\u5347\u5e8f\u6392\u5217\uff0c\u6216\u8005\u6839\u636e\u6784\u9020\u961f\u5217\u65f6\u63d0\u4f9b\u7684 Comparator \u8fdb\u884c\u6392\u5e8f\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e\u6240\u4f7f\u7528\u7684\u6784\u9020\u65b9\u6cd5\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\u4e0d\u80fd\u4fdd\u8bc1\u540c\u4f18\u5148\u7ea7\u5143\u7d20\u7684\u987a\u5e8f\u3002PriorityBlockingQueue\u4e5f\u662f\u57fa\u4e8e\u6700\u5c0f\u4e8c\u53c9\u5806\u5b9e\u73b0\uff0c\u4f7f\u7528\u57fa\u4e8eCAS\u5b9e\u73b0\u7684\u81ea\u65cb\u9501\u6765\u63a7\u5236\u961f\u5217\u7684\u52a8\u6001\u6269\u5bb9\uff0c\u4fdd\u8bc1\u4e86\u6269\u5bb9\u64cd\u4f5c\u4e0d\u4f1a\u963b\u585etake\u64cd\u4f5c\u7684\u6267\u884c\u3002<\/p>\n\n\n\n

DelayQueue\u4f7f\u7528\u573a\u666f
DelayQueue\u53ef\u4ee5\u8fd0\u7528\u5728\u4ee5\u4e0b\u5e94\u7528\u573a\u666f\uff1a<\/p>\n\n\n\n

\u7f13\u5b58\u7cfb\u7edf\u7684\u8bbe\u8ba1\uff1a\u53ef\u4ee5\u7528DelayQueue\u4fdd\u5b58\u7f13\u5b58\u5143\u7d20\u7684\u6709\u6548\u671f\uff0c\u4f7f\u7528\u4e00\u4e2a\u7ebf\u7a0b\u5faa\u73af\u67e5\u8be2DelayQueue\uff0c\u4e00\u65e6\u80fd\u4eceDelayQueue\u4e2d\u83b7\u53d6\u5143\u7d20\u65f6\uff0c\u8868\u793a\u7f13\u5b58\u6709\u6548\u671f\u5230\u4e86\u3002
\u5b9a\u65f6\u4efb\u52a1\u8c03\u5ea6\u3002\u4f7f\u7528DelayQueue\u4fdd\u5b58\u5f53\u5929\u5c06\u4f1a\u6267\u884c\u7684\u4efb\u52a1\u548c\u6267\u884c\u65f6\u95f4\uff0c\u4e00\u65e6\u4eceDelayQueue\u4e2d\u83b7\u53d6\u5230\u4efb\u52a1\u5c31\u5f00\u59cb\u6267\u884c\uff0c\u4ece\u6bd4\u5982TimerQueue\u5c31\u662f\u4f7f\u7528DelayQueue\u5b9e\u73b0\u7684\u3002<\/pre>\n\n\n\n
DelayQueue\u5c5e\u6027<\/h2>\n\n\n\n
\/\/\u53ef\u91cd\u5165\u540c\u6b65\u9501\nprivate final transient ReentrantLock lock = new ReentrantLock();\n\n\/\/DelayQueue\u7684\u5b9e\u73b0\u4f9d\u8d56\u4e8ePriorityQueue(\u4f18\u5148\u961f\u5217)\nprivate final PriorityQueue<E> q = new PriorityQueue<E>();\n\n\/\/\u7b2c\u4e00\u4e2a\u7b49\u5f85\u67d0\u4e2a\u5ef6\u65f6\u5bf9\u8c61\u7684\u7ebf\u7a0b\uff0c\u5728\u5ef6\u65f6\u5bf9\u8c61\u8fd8\u6ca1\u6709\u5230\u671f\u65f6\u5176\u4ed6\u7ebf\u7a0b\u770b\u5230\u8fd9\u4e2aleader\u4e0d\u4e3anull\uff0c\u90a3\u4e48\u5c31\u76f4\u63a5wait\n\/\/\u4e3b\u8981\u662f\u4e3a\u4e86\u907f\u514d\u5927\u91cf\u7ebf\u7a0b\u5728\u540c\u4e00\u65f6\u95f4\u70b9\u5524\u9192\uff0c\u5bfc\u81f4\u5927\u91cf\u7684\u7ade\u4e89\uff0c\u53cd\u800c\u5f71\u54cd\u6027\u80fd\nprivate Thread leader = null;\n\n\/\/\u6761\u4ef6\u961f\u5217\uff0c\u7528\u4e8ewait\u7ebf\u7a0b\nprivate final Condition available = lock.newCondition();\n<\/code><\/pre>\n\n\n\n
DelayQueue\u6784\u9020\u65b9\u6cd5<\/h2>\n\n\n\n
\/\/\u4ece\u4e0a\u9762\u5c5e\u6027\u5c31\u53ef\u4ee5\u770b\u51fa\uff0cDelayQueue\u91c7\u7528\u4e86\u997f\u6c49\u6a21\u5f0f\uff0c\u8c03\u7528\u6784\u9020\u65b9\u6cd5\u5373\u521b\u5efa\u4e86\u961f\u5217\u5b9e\u4f8b\npublic DelayQueue() {}\n\n\/**\n * \u521b\u5efa\u4e00\u4e2aDelayQueue\uff0c\u6700\u521d\u5305\u542b\u7ed9\u5b9a\u7684Collection\u5b9e\u4f8b\u96c6\u5408\u3002\n * @param c \u6700\u521d\u5305\u542b\u7684\u5143\u7d20\u96c6\u5408\n *\/\npublic DelayQueue(Collection<? extends E> c) {\n    this.addAll(c);\n}<\/code><\/pre>\n\n\n\n
DelayQueue\u4e3b\u8981\u65b9\u6cd5<\/h3>\n\n\n\n
offer\u6dfb\u52a0\u5143\u7d20<\/h4>\n\n\n\n
public boolean offer(E e) {\n    final ReentrantLock lock = this.lock;\n    lock.lock();\n    try {\n        \/\/\u8c03\u7528\u4f18\u5148\u961f\u5217\n        q.offer(e);\n        \/\/\u68c0\u9a8c\u5143\u7d20\u662f\u5426\u4e3a\u961f\u9996\uff0c\u662f\u5219\u8bbe\u7f6e leader \u4e3anull, \u5e76\u5524\u9192\u4e00\u4e2a\u6d88\u8d39\u7ebf\u7a0b  \n        if (q.peek() == e) {\n            leader = null;\n            available.signal();\n        }\n        return true;\n    } finally {\n        lock.unlock();\n    }\n}\n<\/code><\/pre>\n\n\n\n
take\u83b7\u53d6\u5143\u7d20<\/h4>\n\n\n\n
public E take() throws InterruptedException {\n    final ReentrantLock lock = this.lock;\n    lock.lockInterruptibly();\n    try {\n        for (;;) {\n            \/\/\u4ece\u4f18\u5148\u961f\u5217\u4e2d\u83b7\u53d6\u7b2c\u4e00\u4e2a\u5143\u7d20\uff0cpeek\u65b9\u6cd5\u4e0d\u4f1a\u5220\u9664\u5143\u7d20\n            E first = q.peek();\n            \/\/\u5982\u679c\u83b7\u53d6\u4e0d\u5230\u6570\u636e\uff0c\u5219\u8c03\u7528available.await()\u8fdb\u5165\u963b\u585e\u72b6\u6001\n            if (first == null)\n                available.await();\n            else {\n                \/\/\u83b7\u53d6\u5f53\u524d\u5ef6\u65f6\u5bf9\u8c61\u662f\u5426\u5230\u671f\n                long delay = first.getDelay(NANOSECONDS);\n                \/\/\u5230\u671f\u90a3\u4e48\u8fd4\u56de\u8fd9\u4e2a\u5ef6\u65f6\u5bf9\u8c61\n                if (delay <= 0)\n                    return q.poll();\n                first = null; \/\/ \n                \/\/leader\u4e0d\u4e3a\u7a7a\uff0c\u8868\u660e\u5df2\u7ecf\u6709\u5176\u4ed6\u7ebf\u7a0b\u5728\u7b49\u5f85\u8fd9\u4e2a\u5ef6\u65f6\u5bf9\u8c61\u4e86\n                \/\/\u4e3a\u4ec0\u4e48\u4e0davailable.awaitNanos(delay)\u5462\uff1f\u8fd9\u5c06\u4f1a\u5bfc\u81f4\u5927\u91cf\u7684\u7ebf\u7a0b\u5728\u540c\u4e00\u65f6\u95f4\u70b9\u88ab\u5524\u9192\uff0c\u7136\u540e\u53bb\u7ade\u4e89\n                \/\/\u8fd9\u4e2a\u5230\u671f\u7684\u5ef6\u65f6\u4efb\u52a1\uff0c\u5f71\u54cd\u6027\u80fd\uff0c\u8fd8\u4e0d\u5982\u76f4\u63a5\u5c06\u4ed6\u4eec\u65e0\u65f6\u95f4\u9650\u5236\u7684wait\uff0cleader\u7ebf\u7a0b\u6216\u8005\u5176\u4ed6\u65b0\u8fdb\u6765\u7684\u7ebf\u7a0b\u83b7\u53d6\u5230\u5ef6\u65f6\u5bf9\u8c61\u540e\uff0c\u53bb\u5524\u9192\n                \/\/\u8ba9\u4ed6\u4eec\u53bb\u7ade\u4e89\u4e0b\u4e00\u4e2a\u5ef6\u65f6\u5bf9\u8c61\n                if (leader != null)\n                    available.await();\n                else {\n                    Thread thisThread = Thread.currentThread();\n                    leader = thisThread;\n                    try {\n                        \/\/\u6307\u5b9a\u7eb3\u79d2\u7ea7\u522b\u7ebf\u7a0b\u963b\u585e\u65f6\u95f4\uff0c\u5f53\u524dwait\u4f4f\u7684\u7ebf\u7a0b\u88ab\u5524\u9192\u540e\u6709\u53ef\u80fd\u4e0e\u5176\u4ed6\u7ebf\u7a0b\u7ade\u4e89\u5931\u8d25\uff0c\u5c31\u4f1a\u8fdb\u5165\u4e86\u540c\u6b65\u961f\u5217\u963b\u585e\uff0c\u90a3\u4e2a\u62a2\u5230\u9501\u7684\u7ebf\u7a0b\u5c31\u4f1a\u53d6\u8d70\u8fd9\u4e2a\u5ef6\u65f6\u5bf9\u8c61\n                        available.awaitNanos(delay);\n                    } finally {\n                        \/\/leader\u7ebf\u7a0b\u88ab\u5524\u9192\u5e76\u83b7\u53d6\u5230\u9501\u4e4b\u540e\u4f1a\u5c06leader\u8bbe\u7f6e\u4e3a\u7a7a\n                        if (leader == thisThread)\n                            leader = null;\n                    }\n                }\n            }\n        }\n    } finally {\n        \/\/leader\u4e3a\u7a7a\u5e76\u4e14\u961f\u5217\u4e0d\u4e3a\u7a7a\uff0c\u90a3\u4e48\u5524\u9192\u6b63\u5728\u7b49\u5f85\u7684\u7ebf\u7a0b\n        if (leader == null && q.peek() != null)\n            available.signal();\n        lock.unlock();  \/\/\u91ca\u653e\u9501\n    }\n}\n<\/code><\/pre>\n\n\n\n
\u4ece\u4f18\u5148\u961f\u5217\u4e2d\u53d6\u503c\uff0c\u5982\u679c\u53d6\u5230\u7684\u5ef6\u65f6\u8282\u70b9\u5df2\u7ecf\u5df2\u7ecf\u5230\u671f\uff0c\u90a3\u4e48\u76f4\u63a5\u8fd4\u56de\uff0c\u5982\u679c\u8fd8\u6ca1\u6709\u5230\u671f\u5e76\u4e14\u5df2\u7ecf\u6709\u5176\u4ed6\u7ebf\u7a0b\u5728\u6267\u884cdelay\u65f6\u95f4\u7b49\u5f85\u4e86\uff08\u4e5f\u5c31\u662fleader\u7ebf\u7a0b\uff09\uff0c\u90a3\u4e48\u6302\u8d77\u81ea\u5df1\uff08\u907f\u514d\u5ef6\u65f6 \u76f8\u540c\u65f6\u95f4\u9020\u6210\u5927\u91cf\u7ebf\u7a0b\u540c\u65f6\u5524\u9192\uff09\uff0c leader\u7ebf\u7a0b\u5728\u6307\u5b9adelay\u65f6\u95f4\u540e\u4e3b\u52a8\u5524\u9192\uff0c\u7136\u540e\u53d6\u7ade\u4e89\u9501\uff0c\u5982\u679c\u7ade\u4e89\u6210\u529f\uff0c\u90a3\u4e48\u5f88\u5927\u6982\u7387\u53ef\u4ee5\u83b7\u53d6\u5230\u5ef6\u65f6\u8282\u70b9\uff0c\u5982\u679c\u7ade\u4e89\u5931\u8d25\uff0c\u5c06\u88ab\u963b\u585e\u3002<\/p>\n\n\n\n
remove\u5220\u9664\u5143\u7d20<\/h4>\n\n\n\n
public boolean remove(Object o) {\n    final ReentrantLock lock = this.lock;\n    lock.lock();\n    try {\n        return q.remove(o);\n    } finally {\n        lock.unlock();\n    }\n}\n<\/code><\/pre>\n\n\n\n
Delayed\u63a5\u53e3<\/h3>\n\n\n\n
\u4f7f\u7528DelayQueue\u7684\u8bdd\uff0c\u653e\u5165\u8be5\u961f\u5217\u7684\u5bf9\u8c61\u5fc5\u987b\u5b9e\u73b0Delayed\u63a5\u53e3\uff0c\u5b9e\u73b0\u7684\u63a5\u53e3\u4e2d\u6709\u4e24\u4e2a\u53c2\u6570\uff1a\u5ef6\u8fdf\u65f6\u95f4\u5355\u4f4d\uff0c\u4f18\u5148\u7ea7\u89c4\u5219\uff0ctake\u65b9\u6cd5\u4f1a\u6839\u636e\u89c4\u5219\u6309\u7167\u4f18\u5148\u7ea7\u6267\u884c<\/p>\n\n\n\n
Delayed\u63a5\u53e3\u6e90\u7801\uff1a<\/p>\n\n\n\n
public interface Delayed extends Comparable<Delayed> {\n\n    \/**\n     * \u8fd4\u56de\u4e0e\u6b64\u5bf9\u8c61\u5173\u8054\u7684\u5269\u4f59\u5ef6\u8fdf\uff08\u7ed9\u5b9a\u7684\u65f6\u95f4\u5355\u4f4d\uff09\u3002\n     * @param unit \u65f6\u95f4\u5355\u4f4d\n     * @\u8fd4\u56de\u5269\u4f59\u5ef6\u8fdf\uff1b\u96f6\u503c\u6216\u8d1f\u503c\u8868\u793a \u5ef6\u8fdf\u5df2\u8fc7\u671f\n     *\/\n    long getDelay(TimeUnit unit);\n}\n<\/code><\/pre>\n\n\n\n
\u56e0\u4e3aDelayed\u7ee7\u627f\u4e86Comparable\uff0c\u6240\u4ee5\u8fd8\u9700\u8981\u5b9e\u73b0compareTo\u65b9\u6cd5\uff0c\u5177\u4f53\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n\n\n\n
class MyDelay implements Delayed {\n\n\n    long delayTime; \/\/ \u5ef6\u8fdf\u65f6\u95f4\n    long expire; \/\/ \u8fc7\u671f\u65f6\u95f4\n\n    public MyDelay(long delayTime, Thread t) {\n        this.delayTime = delayTime;\n        \/\/ \u8fc7\u671f\u65f6\u95f4 = \u5f53\u524d\u65f6\u95f4 + \u5ef6\u8fdf\u65f6\u95f4\n        this.expire = System.currentTimeMillis() + delayTime;\n    }\n\n    \/**\n     * \u5269\u4f59\u65f6\u95f4 = \u5230\u671f\u65f6\u95f4 - \u5f53\u524d\u65f6\u95f4\n     *\/\n    @Override\n    public long getDelay(TimeUnit unit) {\n        return unit.convert(this.expire - System.currentTimeMillis(), TimeUnit.MILLISECONDS);\n    }\n\n    \/**\n     * \u4f18\u5148\u7ea7\u89c4\u5219\uff1a\u4e24\u4e2a\u4efb\u52a1\u6bd4\u8f83\uff0c\u65f6\u95f4\u77ed\u7684\u4f18\u5148\u6267\u884c\n     *\/\n    @Override\n    public int compareTo(Delayed o) {\n        long f = this.getDelay(TimeUnit.MILLISECONDS) - o.getDelay(TimeUnit.MILLISECONDS);\n        return (int) f;\n    }\n}\n<\/code><\/pre>\n\n\n\n
\u4f7f\u7528\u793a\u4f8b<\/h2>\n\n\n\n
\u5b9e\u73b0Delayed\u63a5\u53e3\uff1a<\/p>\n\n\n\n
class MyDelay<T> implements Delayed {\n\n\n    long delayTime; \/\/ \u5ef6\u8fdf\u65f6\u95f4\n    long expire; \/\/ \u8fc7\u671f\u65f6\u95f4\n    T data;\n\n    public MyDelay(long delayTime, T t) {\n        this.delayTime = delayTime;\n        \/\/ \u8fc7\u671f\u65f6\u95f4 = \u5f53\u524d\u65f6\u95f4 + \u5ef6\u8fdf\u65f6\u95f4\n        this.expire = System.currentTimeMillis() + delayTime;\n        data = t;\n    }\n\n    \/**\n     * \u5269\u4f59\u65f6\u95f4 = \u5230\u671f\u65f6\u95f4 - \u5f53\u524d\u65f6\u95f4\n     *\/\n    @Override\n    public long getDelay(TimeUnit unit) {\n        return unit.convert(this.expire - System.currentTimeMillis(), TimeUnit.MILLISECONDS);\n    }\n\n    \/**\n     * \u4f18\u5148\u7ea7\u89c4\u5219\uff1a\u4e24\u4e2a\u4efb\u52a1\u6bd4\u8f83\uff0c\u65f6\u95f4\u77ed\u7684\u4f18\u5148\u6267\u884c\n     *\/\n    @Override\n    public int compareTo(Delayed o) {\n        long f = this.getDelay(TimeUnit.MILLISECONDS) - o.getDelay(TimeUnit.MILLISECONDS);\n        return (int) f;\n    }\n\n\n    @Override\n    public String toString() {\n        return \"delayTime=\" + delayTime +\n                \", expire=\" + expire +\n                \", data=\" + data;\n    }\n}\n<\/code><\/pre>\n\n\n\n
\u6d4b\u8bd5\u7528\u4f8b\u5982\u4e0b\uff1a<\/p>\n\n\n\n
public class DelayQueueDemo {\n\n\n    static BlockingQueue<Delayed> queue = new DelayQueue();\n\n    public static void main(String[] args) throws InterruptedException {\n        queue.add(new MyDelay(8, \"\u7b2c\u4e00\u6b21\u6dfb\u52a0\u4efb\u52a1\"));\n        queue.add(new MyDelay(3, \"\u7b2c\u4e8c\u6b21\u6dfb\u52a0\u4efb\u52a1\"));\n        queue.add(new MyDelay(5, \"\u7b2c\u4e09\u6b21\u6dfb\u52a0\u4efb\u52a1\"));\n\n        while (!queue.isEmpty()) {\n            Delayed delayed = queue.take();\n            System.out.println(delayed);\n        }\n    }\n\n}\n<\/code><\/pre>\n\n\n\n
\u8f93\u51fa\u5982\u4e0b\uff1a<\/p>\n\n\n\n
delayTime=3, expire=1625902338874, data=\u7b2c\u4e8c\u6b21\u6dfb\u52a0\u4efb\u52a1\ndelayTime=5, expire=1625902338876, data=\u7b2c\u4e09\u6b21\u6dfb\u52a0\u4efb\u52a1\ndelayTime=8, expire=1625902338879, data=\u7b2c\u4e00\u6b21\u6dfb\u52a0\u4efb\u52a1\n<\/code><\/pre>\n\n\n\n
\u603b\u7ed3
DelayQueue\u5176\u5b9e\u91c7\u7528\u4e86\u88c5\u9970\u5668\u6a21\u5f0f\uff0c\u5728\u5bf9PriorityQueue\u8fdb\u884c\u5305\u88c5\u4e0b\u589e\u52a0\u4e86\u5ef6\u65f6\u65f6\u95f4\u83b7\u53d6\u5143\u7d20\u7684\u529f\u80fd\uff0c\u5176\u4e3b\u8981\u7279\u70b9\u5f52\u7eb3\u5982\u4e0b\uff1a<\/p>\n\n\n\n
1.DelayQueue\u662f\u4e00\u4e2a\u65e0\u754c\u963b\u585e\u961f\u5217\uff0c\u961f\u5217\u5185\u90e8\u4f7f\u7528PriorityQueue\u6765\u5b9e\u73b0\u3002<\/p>\n\n\n\n
2.\u8fdb\u5165\u961f\u5217\u7684\u5143\u7d20\u5fc5\u987b\u5b9e\u73b0Delayed\u63a5\u53e3\uff0c\u5728\u521b\u5efa\u5143\u7d20\u65f6\u53ef\u4ee5\u6307\u5b9a\u591a\u4e45\u624d\u80fd\u4ece\u961f\u5217\u4e2d\u83b7\u53d6\u5f53\u524d\u5143\u7d20\uff0c\u53ea\u6709\u5728\u5ef6\u8fdf\u671f\u6ee1\u65f6\u624d\u80fd\u4ece\u4e2d\u63d0\u53d6\u5143\u7d20\uff1b<\/p>\n\n\n\n
3.\u8be5\u961f\u5217\u5934\u90e8\u662f\u5ef6\u8fdf\u671f\u6ee1\u540e\u4fdd\u5b58\u65f6\u95f4\u6700\u957f\u7684Delayed\u5143\u7d20\uff1b<\/p>\n\n\n\n
4.\u5982\u679c\u6ca1\u6709\u5ef6\u8fdf\u672a\u8fc7\u671f\u5143\u7d20\uff0c\u4e14\u961f\u5217\u6ca1\u6709\u5934\u90e8\uff0c\u5e76\u4e14poll\u5c06\u8fd4\u56denull\uff1b<\/p>\n\n\n\n
5.\u5f53\u4e00\u4e2a\u5143\u7d20\u7684getDelay\uff08TimeUnit.NANOSECONDS\uff09\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5c0f\u4e8e\u7b49\u4e8e0\u7684\u503c\u65f6\uff0c\u8868\u793a\u8be5\u5143\u7d20\u5df2\u8fc7\u671f\uff1b<\/p>\n\n\n\n
6.\u65e0\u6cd5\u4f7f\u7528poll\u6216take\u79fb\u9664\u672a\u5230\u671f\u7684\u5143\u7d20\uff0c\u4e5f\u4e0d\u4f1a\u5c06\u8fd9\u4e9b\u5143\u7d20\u4f5c\u4e3a\u6b63\u5e38\u5143\u7d20\u5bf9\u5f85\uff1b\u4f8b\u5982\uff1asize\u65b9\u6cd5\u8fd4\u56de\u5230\u671f\u548c\u672a\u5230\u671f\u5143\u7d20\u7684\u8ba1\u6570\u4e4b\u548c\u3002<\/p>\n\n\n\n
7.\u6b64\u961f\u5217\u4e0d\u5141\u8bb8\u4f7f\u7528null\u5143\u7d20\u3002<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
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