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地理Compensating Transaction Pattern(事务修正模式)

  • 九月 28, 2018
  • 地理
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【专题:玉】

古玉鉴赏

诚如而言,刚刚出土之古玉都是碰头带有色沁的,而且会以出土地区的不比,色沁也是未雷同的,比如说南方是较湿润的,所以可能大多因水锈,而北方则是干巴巴的,可能再也多之即使是土沁了,因为玉常年的干湿不同,所以就终于有美妙之色沁也是不会见显示出来的,一般还见面躲起来的。

一如既往码古玉如果无盘玩,而是丢在那边的话,那顶就是是暴殄天物啊,因为出土之古玉不通过盘玩的话,是匪会见展现出玉理的,色沁也非会见显现出来,玉石被的浊气就从来不艺术排下了,所以如果想古玉变得进一步的美,就得的而经盘玩。


未经盘玩的高古玉

Undo the work performed by a series of steps, which together define an
eventually consistent operation, if one or more of the steps fail.
Operations that follow the eventual consistency model are commonly found
in cloud-hosted applications that implement complex business processes
and workflows.

相同、高古玉的盘玩之法

古人对盘玉也是深有厚的,就盘玉之效分为三种植:1.急盘;2.缓盘;3.意盘。

取消由同样名目繁多步骤执行之做事,一起定义一个末段一致的操作,如果一个或者多独步骤失败。在云托管的应用程序,实现复杂的事务与劳作流程,通常操作是仍的尾声一致性模型。

1、急盘法

这种措施是得要拿玉石带以身边的,利用人体的气养,也就算是人体之热能及汗气。几独月下,古玉的人品就会见转移硬,这个时段我们就是足以为此干净之老布进行擦拭,等到擦了来起色的时候,再就此新布来擦拭。

可是非克用有色的分布,而是一旦为此白色之土布,越擦古玉就会愈热,不能够暂停的,擦得差不多矣埃和浊气就本褪去了,虽然身为急盘,但是也是待很丰富日子的。急盘法,也称“武盘”。

盘玩出之高古玉

Context and Problem 背景和题材

Applications running in the cloud frequently modify data. This data may
be spread across an assortment of data sources held in a variety of
geographic locations. To avoid contention and improve performance in a
distributed environment such as this, an application should not attempt
to provide strong transactional consistency. Rather, the application
should implement eventual consistency. In this model, a typical
business operation consists of a series of autonomous steps. While these
steps are being performed the overall view of the system state may be
inconsistent, but when the operation has completed and all of the steps
have been executed the system should become consistent again.

以云端运行的应用程序经常修改数据,此数额可能会见分流于不同地理位置的数量源中。为了避免竞争与提高性,如以分布式环境被,应用程序不应计算提供强有力的事情一致性。相反,应用程序应该实现最终的一致性。在这模型中,一个突出的工作操作由同名目繁多之自主步骤做。虽然这些步骤正在拓展系统状态的总体视图可能是未雷同的,但当操作就成功,并都实施之享有手续的系统应成为同。

Note:

The Data Consistency
Primer provides
more information about why distributed transactions do not scale well,
and the principles that underpin the eventual consistency model.

A significant challenge in the eventual consistency model is how to
handle a step that has failed irrecoverably. In this case it may be
necessary to undo all of the work completed by the previous steps in the
operation. However, the data cannot simply be rolled back because other
concurrent instances of the application may have since changed it. Even
in cases where the data has not been changed by a concurrent instance,
undoing a step might not simply be a matter of restoring the original
state. It may be necessary to apply various business-specific rules (see
the travel website described in the
Example
section).

以最终一致性模型的一个关键的挑战是什么处理一个未果的手续。在这种情景下,它恐怕是少不了之取消所有的办事到位的前一步操作。然而,数据不可知大概地回滚,因为应用程序的任何并发实例可能已改变了她。即使没有得到数码的产出情况的改动,撤消一步可能不仅仅是过来原先的状态。它可能是必备之,适用于各种业务的实际规则(见例子)。

If an operation that implements eventual consistency spans several
heterogeneous data stores, undoing the steps in such an operation will
require visiting each data store in turn. The work performed in every
data store must be undone reliably to prevent the system from remaining
inconsistent.

要是实现最终一致性跨越多独异构数据存储操作,撤消步骤等操作需要各个看每个数据存储。在每个数据存储着执之做事都须吃撤,以戒系统的莫均等。

Not all data affected by an operation that implements eventual
consistency might be held in a database. In a Service Oriented
Architecture (SOA) environment an operation may invoke an action in a
service, and cause a change in the state held by that service. To undo
the operation, this state change must also be undone. This may involve
invoking the service again and performing another action that reverses
the effects of the first.

连无是有所的数码都见面潜移默化及结尾的一致性,可能在一个数据库中进行。在面向服务的体系布局(SOA)环境下之操作可能以劳务调用动作,而造成的劳动状态的扭转。撤消该操作,该状态更改为须让注销。这或涉嫌还调用服务,并施行另外一个五花大绑的熏陶之步履。

2、缓盘法

貌似的话即使是别于腰间,利用人体的人气来养,缓盘是用发出耐心的,这吗是古人修身养性的如出一辙种办法———亦如之“文盘”。一般的话,缓盘要由此两三年岁月,古玉可能才见面略微小变化,一定要身着十年以上古玉才发生或会见回复,然而要是夏季商周老三代表的古玉可能需要带五六十年才会还原。

高古玉组珮鉴赏

Solution 解决方案

Implement a compensating transaction. The steps in a compensating
transaction must undo the effects of the steps in the original
operation. A compensating transaction might not be able to simply
replace the current state with the state the system was in at the start
of the operation because this approach could overwrite changes made by
other concurrent instances of an application. Rather, it must be an
intelligent process that takes into account any work done by concurrent
instances. This process will usually be application-specific, driven by
the nature of the work performed by the original operation.

兑现补充工作。补偿工作中的步骤必须撤回消原操作步骤的震慑。一个补充工作可能不能够简单地更迭当前运作状态的状态,因为这种办法可覆盖应用程序的外并发实例进行转移。相反,它必须是一个智能的长河,需要考虑到任何工作所举行的出现实例。这个进程一般是一定于应用程序的,由原先操作实施的办事之属性驱动之。

A common approach to implementing an eventually consistent operation
that requires compensation is to use a workflow. As the original
operation proceeds, the system records information about each step and
how the work performed by that step can be undone. If the operation
fails at any point, the workflow rewinds back through the steps it has
completed and performs the work that reverses each step. Note that a
compensating transaction might not have to undo the work in the exact
mirror-opposite order of the original operation, and it may be possible
to perform some of the undo steps in parallel.

同一栽普遍的法来促成一个末尾一致的操作,需要续操作是运一个工作流。作为土生土长之操作进行,系统记录有关各一样步之音讯,以及如何成功该步骤所执行的行事。如果在另外时刻操作失败,工作流将回来到步骤都到位及行工作之各级一样步。请留意,补偿工作可能无待以原来的操作的镜像相反的依次中取消工作,并可能来或实施有互的吊销步骤。

Note:

This approach is similar to the Sagas strategy. A description of this
strategy is available online in Clemens Vasters’
blog.

A compensating transaction is itself an eventually consistent operation
and it could also fail. The system should be able to resume the
compensating transaction at the point of failure and continue. It may be
necessary to repeat a step that has failed, so the steps in a
compensating transaction should be defined as idempotent commands. For
more information about idempotency, see Idempotency
Patterns
on Jonathan Oliver’s blog.

补偿性事务本身即是一致栽最终一致的操作,也说不定破产。该系统应该能够恢复在故障点的补偿性操作,并持续。可能要更失败步骤,那么在补工作之手续应定义也幂等的授命。关于幂等性的再度多信息,参见Idempotency
Patterns
on Jonathan Oliver’s blog。

In some cases it may not be possible to recover from a step that has
failed except through manual intervention. In these situations the
system should raise an alert and provide as much information as possible
about the reason for the failure.

在某些情况下,它或许无法恢复从一个挫折的步调,除了通过人工干预。在这种状态下,系统应提供预警,并尽量为黄的因由提供多之音讯。

3、意盘法

这种盘玉方法,是与人的身体直接沾最多之同种艺术,也验证了对于玉石之疼与重。这种措施好和缓盘法相互配合,在手里盘结束的当儿,还要想在玉石之贤惠,这样于玩玉的时呢能够让咱们的心性和品德得到一定的晋级,时间老了光本就死灰复燃了。

高古玉鉴赏

盘玉,对于藏古玉的藏友可谓家常便饭,毫无新鲜点可言。

可大家理解为,如果盘玩不当,你会花很多精力也难以盘出想使之功能来,就是所谓的从倍功半,弄不好还见面毁古玉的皮壳,使她失去该的古玉韵味。

发生土古玉年代、坑口情况、南北差异、东西不同、玉材也参差不齐,如何为一概简易的方法盘所有的古玉呢?

我国之育为什么质量不愈吧,关键是绝非以孔夫子的实心教育:因材施教!这么做基金不过老了,绝大多数以无是协调的孩子,谁愿意操心呀!自己的古玉,你说到底归要操心了吧?

提议:因大施盘!

盘玩高古玉,先要下手明白这块古玉的具体情况,是干坑还是水坑?玉质致密度怎么样?玉性还高不高等等。下边,咱们就伙同探究一下高古玉的坑别及不同之盘玉之法……


Issues and Considerations 问题及注意事项

Consider the following points when deciding how to implement this
pattern:

在控制哪些实现这模式时,考虑以下几点:

  • It might not be easy to determine when a step in an operation that
    implements eventual consistency has failed. A step might not fail
    immediately, but instead it could block. It may be necessary to
    implement some form of time-out mechanism.
  • 立刻或许不便于决断,在一个末尾一致性操作的某部步骤的操作失败。一个手续可能未会见即时失败,但其反而为堵塞。它可能得贯彻某种形式的超时机制。
  • Compensation logic is not easily generalized. A compensating
    transaction is application-specific; it relies on the application
    having sufficient information to be able to undo the effects of each
    step in a failed operation.
  • 上论理是未爱普及之。补偿工作是应用程序特定的,它依靠让应用程序有足的音讯,能够撤消一潮失败的操作着之每一样步的熏陶。
  • You should define the steps in a compensating transaction as
    idempotent commands. This enables the steps to be repeated if the
    compensating transaction itself fails.
  • 乃当定义一个续工作也幂等的吩咐。这使得能够再度的手续,如果上本身失败。
  • The infrastructure that handles the steps in the original operation,
    and the compensating transaction, must be resilient. It must not
    lose the information required to compensate for a failing step, and
    it must be able to reliably monitor the progress of the compensation
    logic.
  • 拍卖在原来操作着之手续及补工作的根底要是生弹性的。它不克去所欲的消息为弥补一个黄的手续,它要能可靠地监测补偿论理的过程。
  • A compensating transaction does not necessarily return the data in
    the system to the state it was in at the start of the original
    operation. Instead, it compensates for the work performed by the
    steps that completed successfully before the operation failed.
  • 填补工作不必返回到原有操作起来时之系统被的数额。相反,它弥补了工作做到的步子,在操作失败之前完成的干活。
  • The order of the steps in the compensating transaction does not
    necessarily have to be the mirror opposite of the steps in the
    original operation. For example, one data store may be more
    sensitive to inconsistencies than another, and so the steps in the
    compensating transaction that undo the changes to this store should
    occur first.
  • 以补充工作中步骤的顺序不肯定是以原先的操作步骤的镜像。例如,一个数额存储可能比其余一个更是敏感,因此,在补工作中,撤消对拖欠存储的变动的手续应该首先来。
  • Placing a short-term timeout-based lock on each resource that is
    required to complete an operation, and obtaining these resources in
    advance, can help increase the likelihood that the overall activity
    will succeed. The work should be performed only after all the
    resources have been acquired. All actions must be finalized before
    the locks expire.
  • 当各级一个资源及放一个短期的超时锁,来形成一个操作,并提早获得这些资源,可以帮增加整体走的可能性。所有的资源还为买断后,才进行即时工作。所有行动要以锁到期前成功。
  • Consider using retry logic that is more forgiving than usual to
    minimize failures that trigger a compensating transaction. If a step
    in an operation that implements eventual consistency fails, try
    handling the failure as a transient exception and repeat the step.
    Only abort the operation and initiate a compensating transaction if
    a step fails repeatedly or irrecoverably.
  • 设想使用重试逻辑,通常是的再次爱的,以减小故障,触发一个补充工作。如果以一个操作中实现最终的一致性的步调失败,试着拍卖故障作为一个暂的不胜,然后再度步骤。只有放弃操作,如果一个步骤失败或者屡屡地启动补偿工作。

Note:

Many of the challenges and issues of implementing a compensating
transaction are the same as those concerned with implementing eventual
consistency. See the section Considerations for Implementing Eventual
Consistency in the Data Consistency
Primer for more
information.

第二、高古玉坑别及玉性判定

When to Use this Pattern 什么时以这种模式

Use this pattern only for operations that must be undone if they fail.
If possible, design solutions to avoid the complexity of requiring
compensating transactions (for more information, see the Data
Consistency
Primer).

行使此模式仅用于操作必须是设她们无可知撤。如果可能的话,设计缓解方案因为避免复杂的渴求加工作(更多信息,见数一致性引物)。

1.生坑暨熟坑古玉

生坑古玉是生后,未经清洗和整甚至还带在泥土的古玉器,基本保障正落地时之原生态。凡清洗过后,经人管打,或以有人欺负之处老摆放了的古玉,便是转入熟坑的。

对待熟坑器,盘熟程度划分一暨九成熟,也可是简称半生或者半成熟。经过常年盘玩后土气和葬气味全失,沁色不再转色的,通身美妙滋润,状若宝石(即呈蜜蜡状并带宝石光)的呢熟坑古玉。

尚未入了土之古玉器称传世品,传世品多见面产生把牛毛纹,并无会见脱胎。

波及坑玉如何判断:
涉嫌坑玉有一个斐然特点,透光后玉花成白色团状,似豆腐花。玉表手感偏干,严重的干如枯槁。
土坑玉如何判断:
土坑玉比较独立的特征是玉器被土质沁染成土苷黄色,各地土质不同,色为发出异样。我见了被沁后色如蜜蜡的土苷黄,也起淡淡灰土黄色的土苷黄。
湿坑玉如何判定:
湿坑玉和水坑玉最充分的区分是:水坑玉有强烈的圆被沁方向性,这和水坑有沉淀有关。所谓湿坑,我晓得也含有水分比较高之条件,受沁部各项不规则,但受沁一定非常当然。


Example 例子

A travel website enables customers to book itineraries. A single
itinerary may comprise a series of flights and hotels. A customer
traveling from Seattle to London and then on to Paris could perform the
following steps when creating an itinerary:

一个旅游网站,使客户订购行程。一个十足的路可包同密密麻麻之航班及酒馆。一各类顾客从西雅图到伦敦,然后至巴黎,在创造行程时,可以执行以下步骤:

  1. Book a seat on flight F1 from Seattle to London.
  2. Book a seat on flight F2 from London to Paris.
  3. Book a seat on flight F3 from Paris to Seattle.
  4. Reserve a room at hotel H1 in London.
  5. Reserve a room at hotel H2 in Paris.

订一摆设自西雅图顶伦敦之航班F1。
订一张从伦敦到巴黎之航班F2。
订一布置由巴黎及西雅图的航班F3。
褚在伦敦一样里边酒店H1。
以巴黎食堂预订一个房。

These steps constitute an eventually consistent operation, although each
step is essentially a separate atomic action in its own right.
Therefore, as well as performing these steps, the system must also
record the counter operations necessary to undo each step in case the
customer decides to cancel the itinerary. The steps necessary to perform
the counter operations can then run as a compensating transaction if
necessary.

这些手续做最终一致性操作,虽然各国一样步基本上是以投机之权单独的原子动作。因此,以及在实践这些手续时,系统还得记录必要撤消在状态下,客户决定撤销行程的每个步骤中的计数器的操作。然后要实行计数器操作步骤可以于用经常运行补偿性事务。

Notice that the steps in the compensating transaction might not be the
exact opposite of the original steps, and the logic in each step in the
compensating transaction must take into account any business-specific
rules. For example, “unbooking” a seat on a flight might not entitle the
customer to a complete refund of any money paid.

吁留意,在添工作的步子可能未是本的手续完全相反,并且在补工作之每个步骤都须考虑到任何特定的事务规则逻辑。例如,“订舱”在航班达的坐席或没有资格客户开发的另款项全额退款。

地理 1

Figure 1 – Generating a compensating transaction to undo a long-running
transaction to book a travel itinerary

贪图1 – 生成补偿事务撤消长时运作的业务预订旅游行程

Note:

It may be possible for the steps in the compensating transaction to be
performed in parallel, depending on how you have designed the
compensating logic for each step.

发生或当添工作的步子并行取决于你什么统筹用来每个步骤中的补给论理给实施。

In many business solutions, failure of a single step does not always
necessitate rolling the system back by using a compensating transaction.
For example, if—after having booked flights F1, F2, and F3 in the travel
website scenario—the customer is unable to reserve a room at hotel H1,
it is preferable to offer the customer a room at a different hotel in
the same city rather than cancelling the flights. The customer may still
elect to cancel (in which case the compensating transaction runs and
undoes the bookings made on flights F1, F2, and F3), but this decision
should be made by the customer rather than by the system.

每当过剩工作解决方案,单步的破产并无总是必不可少采取上工作滚动系统恢复。例如,具有预定航班F1,F2和F3在出游网站情景客户无法预订时酒店H1如果-之后,最好是能啊客户提供于与一个城的房在不同之小吃摊要休是撤销航班。客户仍可以选择取消(在这种场面下,补偿工作中运行,并销关于航班F1,F2和F3作出的订购),但欠决定应由用户,而无是出于网开展。

2.致密度如何判断

运用强光灯照射,看结构是否紧密,用手掂量压手感什么水平,有经验的对象都通这个。

强光灯下玉器密度一目了然

Related Patterns and Guidance 相关模式和点

The following patterns and guidance may also be relevant when
implementing this pattern:

  • Data Consistency
    Primer. The
    Compensating Transaction pattern is frequently used to undo
    operations that implement the eventual consistency model. This
    primer provides more information on the benefits and tradeoffs of
    eventual consistency.
  • Scheduler-Agent-Supervisor
    Pattern.
    This pattern describes how to implement resilient systems that
    perform business operations that utilize distributed services and
    resources. In some circumstances, it may be necessary to undo the
    work performed by an operation by using a compensating transaction.
  • Retry
    Pattern.
    Compensating transactions can be expensive to perform, and it may be
    possible to minimize their use by implementing an effective policy
    of retrying failing operations by following the Retry pattern.

3.玉性强度如何判定

发生句老古话:千年古玉烂如泥。

当然就是误传,考古事实证明,史前古玉完好如初的尚大有玉在!

自,古玉长埋地下几千年,必定要多或者有失挨震慑,很多玉器已经干枯,莫氏硬度就颇没有,就是用硬刷子也得以磨坏。

倘若发现立即档子古玉致密度低、色干枯、不发了,就可以看清该玉性极差。

More Information 更多信息

  • The article
    Sagas on
    Clemens Vasters’ blog.
  • The article Idempotency
    Patterns
    on Jonathan Oliver’s blog.

4.干坑玉器盘玩之法

倘您判定这是判的干坑玉器,先使召开的应是雪干净后就此净水浸泡,看状态常变换趟。干坑玉最需要的凡水分,因为于黑干燥环境,玉器内的组织和慢慢走,所以我们会看到团状的玉花。这是强烈失水现象!

经同交几个月的浸泡,你在过程遭到观测,会意识团状玉花逐步转移多少变散,整体玉器慢慢变透,说明您的古玉在慢慢回升受到。要完全恢复,那就是假设扣押您的玉给不叫力了。呵呵!

经过浸泡后,接下去的该是覆盖,揣在贴身的地方保暖,有空常将出去直接用而的手心盘玩,过不多久,油嘟嘟的古玉盘成了。

5.水坑玉器盘玩之法

说白了,水坑古玉是盘玩用心最少的。绝大多数水坑古玉玉质都十分滋润,和干坑不同了咔嚓?区别就是布局和问题。

水坑受沁严重的,每天用八九十度之温水浸泡半小时,捞出后滴干水分。表面上会见凝结成一交汇雾蒙蒙的质(出灰现象),你得用棕老虎(鬃刷)轻巧快速地盘刷,应该迅速会显玉质油脂状的光泽,直到用温水泡好少出灰或者未出灰了,再借助手工盘玩就十分功告成了。

6.湿坑古玉盘玩之法

湿坑古玉有只性状,受沁比较重(不关受沁面积),这同湿坑古玉接触的物质不像水坑那样水稀释,浓度比较高,清洗后频繁蒙起平等重合厚厚的灰皮,就是转干净了重浸泡还是暗的。

因此,建议如此的古玉采用边温水浸泡,边棕老虎盘刷。

短期内无合乎手掌摩挲!

以不了解古玉内呕吐生之微量元素,是否带有对体有毒的成份。

不要盘玩,就因故平等块薄型的棉布做一个布袋子,包在里头盘玩,可使得隔离毒素。

盘玩玉的布袋

卿见面咨询为何这么说呢?因为好切身体会的,有相同块充满沁的古玉每次洗盘刷后一直用手盘玩,手掌上各地长癣,涂了药膏过段时间又长出了。不思量这么极其好放我之!

7.钙化的古玉怎么盘玩

先行使打明白是石灰沁钙化还是地火沁钙化,这里具体不介绍区分方法了,网上资料很多。

石灰沁钙化在轻度钙化(灯光打进去还有稍稍透光),基本还以浅表层,我提议您进一个小的闷烧锅(湿坑也适用),加纯净水三分之一锅子,底部放置碟子,古玉放在碟子上,像闷烧蹄髈一样拿内胆放灶上烧起,放入保温层内,24小时后以出清洗,然后据此棕老虎盘刷。这样几天一如既往浅反复一个品级,玉质内裹的钙离子慢慢析出,等你发现闷烧后原本浑浊的历届开转移干净了,你尽管可就此手盘玩了!

钙化严重的,没有几年生麻烦恢复玉性。石灰沁盘完后典型的特征是沁色变得如浅粉色碧玺的颜料,俗称“孩儿脸”。地火沁钙化很为难恢复,盘结束后呢未尝小朋友脸现象。

实质上文中所谈,也只是私有的片浅见薄识,千万不要照本宣科,因为小古玉前期是湿坑,随着地理条件之转,慢慢又改为了关系坑了。

若果玉质条件大不同,千万不要先用棕老虎盘刷,这样见面指向古玉表层破坏大十分;可以采用浸泡、捂等手段如其回复玉性,然后一发用其它手段。

———南阳-古雅月整理

推荐:信系列的河南省玉雕大师冀少凡作品《万法归一》鉴赏

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