java实现简单的锁

1. 简单线程锁,一个一个访问

import com.zhl.framework.web.message.SimpleMessage;
import com.zhl.scheduling.service.ProgrammeService;
import com.zhl.scheduling.service.SchedulingDispatchMediaService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Map;
import java.util.concurrent.locks.ReentrantLock;

@Service
public class SchedulingDispatchMediaServiceImpl implements SchedulingDispatchMediaService {
    private final ReentrantLock lock = new ReentrantLock();

    @Override
    @Transactional
    public SimpleMessage autoDispatchMedia(Map map) {
        lock.lock();
        try {
            //需要执行的代码
            return '调用自己的service层'(map);
        } catch (Exception e) {
            e.printStackTrace();
            return SimpleMessage.fail("失败!");
        } finally {
            lock.unlock();
        }
    }
}