zouzanyan

public class CopyOnWriteHashMap<K, V> implements Map<K, V>, Cloneable {
    private volatile Map<K, V> internalMap = new HashMap<>();
    private static final Unsafe UNSAFE;
    private static final long INTERNAL_MAP_OFFSET;

    static {
        try {
            Field theUnsafeField = Unsafe.class.getDeclaredField("theUnsafe");
            theUnsafeField.setAccessible(true);
            UNSAFE = (Unsafe) theUnsafeField.get(null);

zouzanyan

class SnowflakeIdGenerator {
    // 起始时间戳 (2024-01-01 00:00:00)
    private final long START_TIMESTAMP = 1704038400000L;
    
    // 每部分占用位数
    private final long SEQUENCE_BIT = 12;    // 序列号占12位
    private final long MACHINE_BIT = 5;      // 机器ID占5位
    private final long DATACENTER_BIT = 5;   // 数据中心占5位
    
    // 最大值

zouzanyan

你好,gist.github