{"id":3025,"date":"2026-09-14T11:04:22","date_gmt":"2026-09-14T03:04:22","guid":{"rendered":"http:\/\/139.196.114.170\/?p=3025"},"modified":"2026-09-14T11:04:22","modified_gmt":"2026-09-14T03:04:22","slug":"arrayblockingqueue","status":"publish","type":"post","link":"http:\/\/139.196.114.170\/?p=3025","title":{"rendered":"ArrayBlockingQueue"},"content":{"rendered":"

ArrayBlockingQueue<\/code> \u662f Java \u5e76\u53d1\u5305\u4e2d\u4e00\u4e2a\u57fa\u4e8e\u6570\u7ec4<\/strong>\u5b9e\u73b0\u7684\u6709\u754c\u963b\u585e\u961f\u5217<\/strong>\uff0c\u5176\u6838\u5fc3\u8bbe\u8ba1\u56f4\u7ed5 ReentrantLock<\/code> \u548c\u4e24\u4e2a Condition<\/code> \u6761\u4ef6\u53d8\u91cf\u5c55\u5f00\uff0c\u7528\u4e8e\u9ad8\u6548\u5730\u89e3\u51b3\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u751f\u4ea7\u8005-\u6d88\u8d39\u8005\u95ee\u9898\u3002<\/p>\n

\ud83d\udcca \u5e95\u5c42\u6570\u636e\u7ed3\u6784<\/h3>\n

ArrayBlockingQueue<\/code> \u7684\u6838\u5fc3\u5b57\u6bb5\u5b9a\u4e49\u6e05\u6670\u4f53\u73b0\u4e86\u5176\u6570\u636e\u7ed3\u6784\uff1a<\/p>\n

    \n
  • final Object[] items<\/code><\/strong>\uff1a\u4e00\u4e2a\u5b9a\u957f\u6570\u7ec4\uff0c\u7528\u4e8e\u5b58\u50a8\u961f\u5217\u5143\u7d20\u3002\u5b83\u5728\u6784\u9020\u65f6\u521d\u59cb\u5316\uff0c\u5bb9\u91cf\u4e00\u65e6\u786e\u5b9a\u4fbf\u4e0d\u53ef\u66f4\u6539\u3002<\/li>\n
  • int takeIndex<\/code><\/strong>\uff1a\u6307\u5411\u4e0b\u4e00\u4e2a\u88ab\u53d6\u51fa\u5143\u7d20\uff08\u961f\u5934\uff09\u7684\u7d22\u5f15\u3002<\/li>\n
  • int putIndex<\/code><\/strong>\uff1a\u6307\u5411\u4e0b\u4e00\u4e2a\u88ab\u63d2\u5165\u5143\u7d20\uff08\u961f\u5c3e\uff09\u7684\u7d22\u5f15\u3002<\/li>\n
  • int count<\/code><\/strong>\uff1a\u5f53\u524d\u961f\u5217\u4e2d\u7684\u5143\u7d20\u6570\u91cf\uff0c\u7528\u4e8e\u5224\u65ad\u961f\u5217\u662f\u5426\u4e3a\u7a7a\u6216\u5df2\u6ee1\u3002<\/li>\n
  • final ReentrantLock lock<\/code><\/strong>\uff1a\u4e00\u4e2a\u53ef\u91cd\u5165\u9501\uff0c\u7528\u4e8e\u63a7\u5236\u6240\u6709\u5e76\u53d1\u8bbf\u95ee\uff0c\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u57fa\u7840\u3002<\/li>\n
  • private final Condition notEmpty<\/code><\/strong>\uff1a\u6761\u4ef6\u53d8\u91cf\uff0c\u7528\u4e8e\u6d88\u8d39\u8005\u7ebf\u7a0b<\/strong>\u5728\u961f\u5217\u4e3a\u7a7a\u65f6\u7b49\u5f85\u3002<\/li>\n
  • private final Condition notFull<\/code><\/strong>\uff1a\u6761\u4ef6\u53d8\u91cf\uff0c\u7528\u4e8e\u751f\u4ea7\u8005\u7ebf\u7a0b<\/strong>\u5728\u961f\u5217\u5df2\u6ee1\u65f6\u7b49\u5f85\u3002<\/li>\n<\/ul>\n

    \u8be5\u961f\u5217\u5728\u903b\u8f91\u4e0a\u662f\u4e00\u4e2a\u5faa\u73af\u6570\u7ec4<\/strong>\u3002\u5f53 putIndex<\/code> \u6216 takeIndex<\/code> \u5230\u8fbe\u6570\u7ec4\u672b\u5c3e\u65f6\uff0c\u4f1a\u901a\u8fc7\u53d6\u6a21\u8fd0\u7b97\u56de\u5230\u6570\u7ec4\u7684\u8d77\u59cb\u4f4d\u7f6e\uff080\uff09\uff0c\u4ece\u800c\u9ad8\u6548\u5730\u5229\u7528\u6570\u7ec4\u7a7a\u95f4\uff0c\u5b9e\u73b0\u5148\u8fdb\u5148\u51fa\uff08FIFO\uff09\u7684\u987a\u5e8f\u3002<\/p>\n

    \u2699\ufe0f \u6838\u5fc3\u65b9\u6cd5\u89e3\u6790<\/h3>\n

    ArrayBlockingQueue<\/code> \u7684\u6838\u5fc3\u65b9\u6cd5\u90fd\u4f9d\u8d56\u4e8e lock<\/code> \u548c Condition<\/code> \u6765\u5b9e\u73b0\u7ebf\u7a0b\u95f4\u7684\u540c\u6b65\u4e0e\u963b\u585e\u3002<\/p>\n

    1. \u5165\u961f\u65b9\u6cd5\uff1aput(E e)<\/code><\/h4>\n

    put<\/code> \u65b9\u6cd5\u7528\u4e8e\u5411\u961f\u5217\u5c3e\u90e8\u63d2\u5165\u5143\u7d20\u3002\u5982\u679c\u961f\u5217\u5df2\u6ee1\uff0c\u5b83\u4f1a\u963b\u585e<\/strong>\u5f53\u524d\u751f\u4ea7\u8005\u7ebf\u7a0b\uff0c\u76f4\u5230\u961f\u5217\u6709\u7a7a\u95f2\u7a7a\u95f4\u3002<\/p>\n

    public void put(E e) throws InterruptedException {\n    Objects.requireNonNull(e);\n    final ReentrantLock lock = this.lock;\n    lock.lockInterruptibly(); \/\/ \u83b7\u53d6\u53ef\u4e2d\u65ad\u9501\n    try {\n        while (count == items.length) \/\/ \u5982\u679c\u961f\u5217\u5df2\u6ee1\n            notFull.await(); \/\/ \u5728 notFull \u6761\u4ef6\u4e0a\u7b49\u5f85\n        enqueue(e); \/\/ \u5c06\u5143\u7d20\u63d2\u5165\u961f\u5217\n    } finally {\n        lock.unlock();\n    }\n}<\/code><\/pre>\n
    \u6d41\u7a0b\u89e3\u6790<\/strong>\uff1a<\/p>\n
      \n
    1. \u83b7\u53d6\u9501<\/strong>\uff1a\u8c03\u7528 lock.lockInterruptibly()<\/code> \u83b7\u53d6\u9501\uff0c\u6b64\u64cd\u4f5c\u53ef\u54cd\u5e94\u4e2d\u65ad\u3002<\/li>\n
    2. \u68c0\u67e5\u961f\u5217\u6ee1<\/strong>\uff1a\u5728 while<\/code> \u5faa\u73af\u4e2d\u68c0\u67e5 count == items.length<\/code>\u3002\u4f7f\u7528 while<\/code> \u800c\u975e if<\/code> \u662f\u4e3a\u4e86\u9632\u6b62\u865a\u5047\u5524\u9192<\/strong>\u3002<\/li>\n
    3. \u7b49\u5f85<\/strong>\uff1a\u82e5\u961f\u5217\u5df2\u6ee1\uff0c\u8c03\u7528 notFull.await()<\/code>\uff0c\u7ebf\u7a0b\u88ab\u963b\u585e\u5e76\u91ca\u653e\u9501\uff0c\u8fdb\u5165 notFull<\/code> \u7684\u7b49\u5f85\u961f\u5217\u3002<\/li>\n
    4. \u5165\u961f<\/strong>\uff1a\u5f53\u88ab\u5524\u9192\u4e14\u961f\u5217\u4e0d\u6ee1\u65f6\uff0c\u8c03\u7528 enqueue(e)<\/code> \u6267\u884c\u5165\u961f\u64cd\u4f5c\u3002<\/li>\n
    5. \u91ca\u653e\u9501<\/strong>\uff1a\u65e0\u8bba\u64cd\u4f5c\u6210\u529f\u4e0e\u5426\uff0c\u90fd\u5728 finally<\/code> \u5757\u4e2d\u91ca\u653e\u9501\u3002<\/li>\n<\/ol>\n
      2. \u51fa\u961f\u65b9\u6cd5\uff1atake()<\/code><\/h4>\n
      take<\/code> \u65b9\u6cd5\u7528\u4e8e\u4ece\u961f\u5217\u5934\u90e8\u53d6\u51fa\u5e76\u79fb\u9664\u5143\u7d20\u3002\u5982\u679c\u961f\u5217\u4e3a\u7a7a\uff0c\u5b83\u4f1a\u963b\u585e<\/strong>\u5f53\u524d\u6d88\u8d39\u8005\u7ebf\u7a0b\uff0c\u76f4\u5230\u961f\u5217\u4e2d\u6709\u5143\u7d20\u53ef\u7528\u3002<\/p>\n
      public E take() throws InterruptedException {\n    final ReentrantLock lock = this.lock;\n    lock.lockInterruptibly();\n    try {\n        while (count == 0) \/\/ \u5982\u679c\u961f\u5217\u4e3a\u7a7a\n            notEmpty.await(); \/\/ \u5728 notEmpty \u6761\u4ef6\u4e0a\u7b49\u5f85\n        return dequeue(); \/\/ \u4ece\u961f\u5217\u4e2d\u53d6\u51fa\u5143\u7d20\u5e76\u8fd4\u56de\n    } finally {\n        lock.unlock();\n    }\n}<\/code><\/pre>\n
      \u6d41\u7a0b\u89e3\u6790<\/strong>\uff1a<\/p>\n
        \n
      1. \u83b7\u53d6\u9501<\/strong>\uff1a\u540c\u6837\u901a\u8fc7 lock.lockInterruptibly()<\/code> \u83b7\u53d6\u9501\u3002<\/li>\n
      2. \u68c0\u67e5\u961f\u5217\u7a7a<\/strong>\uff1a\u68c0\u67e5 count == 0<\/code>\u3002<\/li>\n
      3. \u7b49\u5f85<\/strong>\uff1a\u82e5\u961f\u5217\u4e3a\u7a7a\uff0c\u8c03\u7528 notEmpty.await()<\/code> \u963b\u585e\u7ebf\u7a0b\uff0c\u8fdb\u5165 notEmpty<\/code> \u7684\u7b49\u5f85\u961f\u5217\u3002<\/li>\n
      4. \u51fa\u961f<\/strong>\uff1a\u5f53\u88ab\u5524\u9192\u4e14\u961f\u5217\u975e\u7a7a\u65f6\uff0c\u8c03\u7528 dequeue()<\/code> \u6267\u884c\u51fa\u961f\u64cd\u4f5c\u5e76\u8fd4\u56de\u5143\u7d20\u3002<\/li>\n
      5. \u91ca\u653e\u9501<\/strong>\uff1a\u5728 finally<\/code> \u5757\u4e2d\u91ca\u653e\u9501\u3002<\/li>\n<\/ol>\n
        3. \u975e\u963b\u585e\u65b9\u6cd5\uff1aoffer(E e)<\/code> \u4e0e poll()<\/code><\/h4>\n
        \u9664\u4e86\u963b\u585e\u65b9\u6cd5\uff0c\u8be5\u7c7b\u8fd8\u63d0\u4f9b\u4e86\u975e\u963b\u585e\u7684\u66ff\u4ee3\u65b9\u6848\uff1a<\/p>\n