我是云效的全栈开发女工程师，朱默，花名：墨瑜。

据说认真工作的程序员魅力值加10：

我的第83行代码来自云效RDC上某一功能的代码, 猜猜是哪个功能：

public class MysqlLockBuilder {
    private DataSource dataSource;
    private String mysqlTableName;

    private LockDataAccessor lockDataAccessor;

    private LockStateAccessor lockStateAccessor;
    private String defaultClientId;

    public void init() throws SQLException {
        MysqlLockDataAccessor mysqlLockDataAccessor = new MysqlLockDataAccessor();
        mysqlLockDataAccessor.setMysqlTableName(mysqlTableName);
        mysqlLockDataAccessor.setConnection(dataSource.getConnection());
        lockDataAccessor = mysqlLockDataAccessor;

        defaultClientId = IP.getIpAddr();

        lockStateAccessor = buildMysqlLockStateAccessor();
    }

    private LockStateAccessor buildMysqlLockStateAccessor() throws SQLException {
        MysqlLockStateAccessor lockStateAccessor = new MysqlLockStateAccessor();
        lockStateAccessor.setMysqlTableName(mysqlTableName);
        lockStateAccessor.setConnection(dataSource.getConnection());
        lockStateAccessor.init();
        return lockStateAccessor;
    }

    public String getDefaultClientId() {
        return defaultClientId;
    }

    public void setDefaultClientId(String defaultClientId) {
        this.defaultClientId = defaultClientId;
    }

    public TimedLock lockForAWhile(String lockId, int timeout) throws LockAccessException {
        TimedLock lock = new TimedLock(lockId, defaultClientId, timeout);
        try {
            lock.setLockStateAccessor(buildMysqlLockStateAccessor());
            lock(lock);
            return lock;
        } catch (SQLException e){
            lock.close();
            throw new LockAccessException(e);
        } catch (LockAccessException e) {
            lock.close();
            throw e;
        }
    }

    public ScopedLock lockWhenAlive(String lockId) throws LockAccessException {
        ScopedLock lock = new ScopedLock(lockId, defaultClientId);
        try {
            lock.setLockStateAccessor(buildMysqlLockStateAccessor());
            lock(lock);
            return lock;
        } catch (SQLException e){
            lock.close();
            throw new LockAccessException(e);
        } catch (LockAccessException e){
            lock.close();
            throw e;
        }
    }

    /**
     * 指定clientId，加时间锁
     * @param lockId: 锁名称
     * @param timeout: 加锁时长
     * @param clientId: 锁的持有者
     * @return
     * @throws LockAccessException
     */
    public TimedLock lockForAWhileByClient(String lockId, int timeout, String clientId) throws LockAccessException {
        TimedLock lock = new TimedLock(lockId, clientId, timeout);
        try {
            LockStateAccessor timeLockStateAccessor = buildMysqlLockStateAccessor();
            lock.setLockStateAccessor(timeLockStateAccessor);
            lock(lock);
            return lock;
        } catch (SQLException e){
            lock.close();
            throw new LockAccessException(e);
        } catch (LockAccessException e) {
            lock.close();
            throw e;
        }
    }

    /**
     * 刷新时间锁，延长加锁时长
     * @param lockingContext
     * @return
     * @throws LockAccessException
     */
    public Boolean refreshTimeLockByContext(LockingContext lockingContext) throws LockAccessException {
        if(lockStateAccessor == null){
            try {
                lockStateAccessor = buildMysqlLockStateAccessor();
            }catch (SQLException e) {
                throw new LockAccessException(e);
            }
        }

        return lockStateAccessor.refreshTimeLock(lockingContext);
    }

    /**
     * 手动解锁
     * @param lockingContext
     * @return
     * @throws LockAccessException
     */
    public Boolean unlockTimeLockByContext(LockingContext lockingContext) throws LockAccessException {
        if(lockStateAccessor == null){
            try {
                lockStateAccessor = buildMysqlLockStateAccessor();
            }catch (SQLException e) {
                throw new LockAccessException(e);
            }
        }

        return lockStateAccessor.timedUnlock(lockingContext);
    }

    /**
     * 根据锁id，获取时间锁信息
     * @param lockId
     * @return
     * @throws LockAccessException
     */
    public LockingInfo getTimedLockInfo(String lockId) throws LockAccessException{
        return lockStateAccessor.getTimedLockingInfo(lockId);
    }

    private void lock(Lockable lock) throws LockAccessException {
        try {
            lockDataAccessor.createIfNotPresent(lock.id());

            boolean locked = lock.lock();
            if (!locked) {
                throw new LockAccessException("Lock has been occupied");
            }
        } catch (Exception e) {
            throw new LockAccessException(e);
        }
    }

    public String getMysqlTableName() {
        return mysqlTableName;
    }

    public void setMysqlTableName(String mysqlTableName) {
        this.mysqlTableName = mysqlTableName;
    }

    public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
    }

    public DataSource getDataSource() {
        return dataSource;
    }

}

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