private UpdateOperations<JobPo> addUpdateField(UpdateOperations<JobPo> operations, String field, Object o) {
        if (!checkCondition(o)) {
            return operations;
        }
        operations.set(field, o);
        return operations;
    }
@author Robert HG (254963746@qq.com) on 6/7/15.
lts-core/src/main/java/com/github/ltsopensource/queue/mongo/AbstractMongoJobQueue.java