Vite 从入门到精通，玩转新时代前端构建法则

Vite 从入门到精通，玩转新时代前端构建法则

/**
 * 锁战略笼统基类
 */
@Slf4j
abstract class LockStrategy {
    @Autowired
    private RedissonClient redissonClient;
    /**
     * 创立RLock
     *
     * @param keys
     * @param parameterNames
     * @param args
     * @param keyConstant
     * @return
     */
    abstract RLock createLock(String[] keys, String[] parameterNames, Object[] args, String keyConstant, RedissonClient redissonClient);
    /**
     * 获取RLock
     *
     * @param keys
     * @param parameterNames
     * @param args
     * @param keyConstant
     * @return
     */
    public RLock[] getRLocks(String[] keys, String[] parameterNames, Object[] args, String keyConstant) {
        List rLocks = new ArrayList<>();
        for (String key : keys) {
            List valueBySpel = getValueBySpel(key, parameterNames, args, keyConstant);
            for (String s : valueBySpel) {
                rLocks.add(redissonClient.getLock(s));
            }
        }
        RLock[] locks = new RLock[rLocks.size()];
        int index = 0;
        for (RLock r : rLocks) {
            locks[index++] = r;
        }
        return locks;
    }
    /**
     * 经过spring Spel 获取参数
     *
     * @param key            定义的key值 以#开头 例如:#user
     * @param parameterNames 形参
     * @param args           形参值
     * @param keyConstant    key的常亮
     * @return
     */
    List getValueBySpel(String key, String[] parameterNames, Object[] args, String keyConstant) {
        List keys = new ArrayList<>();
        if (!key.contains(PLACE_HOLDER)) {
            String s = REDISSON_LOCK + key + keyConstant;
            log.info("没有运用spel表达式value->{}", s);
            keys.add(s);
            return keys;
        }
        // spel解析器
        ExpressionParser parser = new SpelExpressionParser();
        // spel上下文
        EvaluationContext context = new StandardEvaluationContext();
        for (int i = 0; i < parameterNames.length; i++) {
            context.setVariable(parameterNames[i], args[i]);
        }
        Expression expression = parser.parseExpression(key);
        Object value = expression.getValue(context);
        if (value != null) {
            if (value instanceof List) {
                List valueList = (List) value;
                for (Object o : valueList) {
                    keys.add(REDISSON_LOCK + o.toString() + keyConstant);
                }
            } else if (value.getClass().isArray()) {
                Object[] objects = (Object[]) value;
                for (Object o : objects) {
                    keys.add(REDISSON_LOCK + o.toString() + keyConstant);
                }
            } else {
                keys.add(REDISSON_LOCK + value.toString() + keyConstant);
            }
        }
        log.info("spel表达式key={},value={}", key, keys);
        return keys;
    }
}
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再提供各种锁形式的详细完成：

• 可重入锁：

  /**

  • 可重入锁战略 */ public class ReentrantLockStrategy extends LockStrategy { @Override public RLock createLock(String[] keys, String[] parameterNames, Object[] args, String keyConstant, RedissonClient redissonClient) { List valueBySpel = getValueBySpel(keys[0], parameterNames, args, keyConstant); //假如spel表达式是数组或者汇合 则运用红锁 if (valueBySpel.size() == 1) { return redissonClient.getLock(valueBySpel.get(0)); } else { RLock[] locks = new RLock[valueBySpel.size()]; int index = 0; for (String s : valueBySpel) { locks[index++] = redissonClient.getLock(s); } return new RedissonRedLock(locks); } } } 复制代码

• 公平锁：download

  /**

  • 公平锁战略 */ public class FairLockStrategy extends LockStrategy { @Override public RLock createLock(String[] keys, String[] parameterNames, Object[] args, String keyConstant, RedissonClient redissonClient) { return redissonClient.getFairLock(getValueBySpel(keys[0], parameterNames, args, keyConstant).get(0)); } } 复制代码

• 联锁

  /**

  • 联锁战略 */ public class MultipleLockStrategy extends LockStrategy { @Override public RLock createLock(String[] keys, String[] parameterNames, Object[] args, String keyConstant, RedissonClient redissonClient) { RLock[] locks = getRLocks(keys, parameterNames, args, keyConstant); return new RedissonMultiLock(locks); } } 复制代码

• 红锁

  /**

  • 红锁战略 */ public class RedLockStrategy extends LockStrategy { @Override public RLock createLock(String[] keys, String[] parameterNames, Object[] args, String keyConstant, RedissonClient redissonClient) { RLock[] locks = getRLocks(keys, parameterNames, args, keyConstant); return new RedissonRedLock(locks); } } 复制代码

• 读锁

  /**

  • 读锁战略 */ public class ReadLockStrategy extends LockStrategy { @Override public RLock createLock(String[] keys, String[] parameterNames, Object[] args, String keyConstant, RedissonClient redissonClient) { RReadWriteLock rwLock = redissonClient.getReadWriteLock(getValueBySpel(keys[0], parameterNames, args, keyConstant).get(0)); return rwLock.readLock(); } } 复制代码

• 写锁

  /**

  • 写锁战略 */ public class WriteLockStrategy extends LockStrategy { @Override public RLock createLock(String[] keys, String[] parameterNames, Object[] args, String keyConstant, RedissonClient redissonClient) { RReadWriteLock rwLock = redissonClient.getReadWriteLock(getValueBySpel(keys[0], parameterNames, args, keyConstant).get(0)); return rwLock.writeLock(); } } 复制代码

最后提供一个战略工厂初始化锁战略：

/**
 * 锁的战略工厂
 */
@Service
public class LockStrategyFactory {
    private LockStrategyFactory() {
    }
    private static final Map<LockModel, LockStrategy> STRATEGIES = new HashMap<>(6);
    static {
        STRATEGIES.put(LockModel.FAIR, new FairLockStrategy());
        STRATEGIES.put(LockModel.REENTRANT, new ReentrantLockStrategy());
        STRATEGIES.put(LockModel.RED_LOCK, new RedLockStrategy());
        STRATEGIES.put(LockModel.READ, new ReadLockStrategy());
        STRATEGIES.put(LockModel.WRITE, new WriteLockStrategy());
        STRATEGIES.put(LockModel.MULTIPLE, new MultipleLockStrategy());
    }
    public RLock createLock(LockModel lockModel, String[] keys, String[] parameterNames, Object[] args, String keyConstant, RedissonClient redissonClient) {
        return STRATEGIES.get(lockModel).createLock(keys, parameterNames, args, keyConstant, redissonClient);
    }
}
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8、运用方式

    @Lock(keys = "#query.channel") // 支持spel
    @ApiOperation("分页列表")
    @GetMapping
    public ApiPageResult list(VendorProjectItemQuery query, Pagination pagination) {
        return ApiPageResult.success(pagination, vendorProjectItemService.list(query, pagination), vendorProjectItemService.count(query));
    }

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