Re: [PROPOSAL] create e-commerce project as a ServiceComb sample project for user guiding purpose.
I think we need to focus on how to use ServiceComb instead of write another application which only has few audience. My suggestion is we just break down the requirements and show user how to do authentication with ServiceComb java-chassis, how to server the front-end pages with ServiceComb java-chassis, how to interact with edge service. The example should be simple enough which could be the start point for user who is first use ServiceComb. BTW, ZhengYangYong already write a tutorial[1] about how to use ServiceComb last year, you may need to consider to build something on top of that. [1]https://github.com/zhengyangyong/scaffold Willem Jiang Twitter: willemjiang Weibo: 姜宁willem On Mon, Jul 22, 2019 at 10:57 AM Bin Ma wrote: > > It sounds a good idea : ) > > Can you briefly show us the design how to use ServiceComb to build > an e-commerce? thks > > > Best Wishes & Regards > --- > Mabin > > > > 郑志鹏 于2019年7月22日周一 上午10:26写道： > > > Thanks for you suggestions. I will make sure the is licensed under Apache > > License and the libraries it uses is compatible. And I will make the > > document as detailed as possible. > > > > Liubao (A) 于2019年7月20日周六 下午10:55写道： > > > > > Any samples to use ServiceComb is preferred. I have some questions before > > > you contribute the code: > > > > > >* Make sure the project is licensed under Apache License and the > > > libraries it uses is compatible. > > >* Samples are intended to help users how to program. I'd prefer the > > > e-commerce project have some documents to describe the project and the > > > techniches and best proctics. > > > > > > -邮件原件- > > > 发件人: 郑志鹏 [mailto:aleczhen...@gmail.com] > > > 发送时间: 2019年7月19日 17:01 > > > 收件人: dev@servicecomb.apache.org > > > 主题: [PROPOSAL] create e-commerce project as a ServiceComb sample project > > > for user guiding purpose. > > > > > > Hi, All > > > > > > Recently, I communicated with some ServiceComb new users, they want an > > > e-commerce system ServiceComb sample project with real business > > background. > > > They think with this demo they can learn ServiceComb’s abilities and > > > usages *more efficiently*. > > > > > > Then I found this project https://github.com/apache/servicecomb-samples. > > > So I want to develop an e-commerce system demo and *devote* it to this > > > project as this project’s sub-project. > > > -- > > > The business background of my planing project: > > > > > > Traditionally, a real estate developer in china will show their nearing > > > completion buildings to the customers for a couple of days, then > > determine > > > an open sale time for all customers to make real deal offline. Those > > > customers have to get to sale place long before the open sale time and > > > queue up,because only in this way they get the chances to pick the > > > apartment which they like mostly. So recently, more and more real estate > > > developers begin to build an online apartments/houses open sale system. > > The > > > e-commerce system help their customer to pick the houses more easily and > > > more fairly. This is the system which I plan to build with ServiceComb. > > > Why I choose this project as a guiding sample of ServiceComb? > > > > > > Real estate developers use this system to make a deal with their customer > > > online. So, yes! This is a real e-commerce system with real commercial > > > value. But this is also a real simple e-commerce system which has no > > > payment and shipping module. So Its simplicity is good for the guiding > > > purpose. Meanwhile, because these trading subjects of this system are > > very > > > expensive，and there will be high QPS when the open sale time just > > arrives. > > > So There are high requirements for the system’s scalability, availability > > > and robustness.It’s an applicable project to show ServiceComb’s > > abilities. > > > Any questions and suggestions? > > > > > > -- > > > Best Wishes & Regards > > > ——— > > > Alec Zheng > > > > > > > > > -- > > Best Wishes & Regards > > ——— > > Alec Zheng > >
Re: [PROPOSAL] create e-commerce project as a ServiceComb sample project for user guiding purpose.
It sounds a good idea : ) Can you briefly show us the design how to use ServiceComb to build an e-commerce? thks Best Wishes & Regards --- Mabin 郑志鹏 于2019年7月22日周一 上午10:26写道： > Thanks for you suggestions. I will make sure the is licensed under Apache > License and the libraries it uses is compatible. And I will make the > document as detailed as possible. > > Liubao (A) 于2019年7月20日周六 下午10:55写道： > > > Any samples to use ServiceComb is preferred. I have some questions before > > you contribute the code: > > > >* Make sure the project is licensed under Apache License and the > > libraries it uses is compatible. > >* Samples are intended to help users how to program. I'd prefer the > > e-commerce project have some documents to describe the project and the > > techniches and best proctics. > > > > -邮件原件- > > 发件人: 郑志鹏 [mailto:aleczhen...@gmail.com] > > 发送时间: 2019年7月19日 17:01 > > 收件人: dev@servicecomb.apache.org > > 主题: [PROPOSAL] create e-commerce project as a ServiceComb sample project > > for user guiding purpose. > > > > Hi, All > > > > Recently, I communicated with some ServiceComb new users, they want an > > e-commerce system ServiceComb sample project with real business > background. > > They think with this demo they can learn ServiceComb’s abilities and > > usages *more efficiently*. > > > > Then I found this project https://github.com/apache/servicecomb-samples. > > So I want to develop an e-commerce system demo and *devote* it to this > > project as this project’s sub-project. > > -- > > The business background of my planing project: > > > > Traditionally, a real estate developer in china will show their nearing > > completion buildings to the customers for a couple of days, then > determine > > an open sale time for all customers to make real deal offline. Those > > customers have to get to sale place long before the open sale time and > > queue up,because only in this way they get the chances to pick the > > apartment which they like mostly. So recently, more and more real estate > > developers begin to build an online apartments/houses open sale system. > The > > e-commerce system help their customer to pick the houses more easily and > > more fairly. This is the system which I plan to build with ServiceComb. > > Why I choose this project as a guiding sample of ServiceComb? > > > > Real estate developers use this system to make a deal with their customer > > online. So, yes! This is a real e-commerce system with real commercial > > value. But this is also a real simple e-commerce system which has no > > payment and shipping module. So Its simplicity is good for the guiding > > purpose. Meanwhile, because these trading subjects of this system are > very > > expensive，and there will be high QPS when the open sale time just > arrives. > > So There are high requirements for the system’s scalability, availability > > and robustness.It’s an applicable project to show ServiceComb’s > abilities. > > Any questions and suggestions? > > > > -- > > Best Wishes & Regards > > ——— > > Alec Zheng > > > > > -- > Best Wishes & Regards > ——— > Alec Zheng >
Re: [PROPOSAL] create e-commerce project as a ServiceComb sample project for user guiding purpose.
Thanks for you suggestions. I will make sure the is licensed under Apache License and the libraries it uses is compatible. And I will make the document as detailed as possible. Liubao (A) 于2019年7月20日周六 下午10:55写道： > Any samples to use ServiceComb is preferred. I have some questions before > you contribute the code: > >* Make sure the project is licensed under Apache License and the > libraries it uses is compatible. >* Samples are intended to help users how to program. I'd prefer the > e-commerce project have some documents to describe the project and the > techniches and best proctics. > > -邮件原件- > 发件人: 郑志鹏 [mailto:aleczhen...@gmail.com] > 发送时间: 2019年7月19日 17:01 > 收件人: dev@servicecomb.apache.org > 主题: [PROPOSAL] create e-commerce project as a ServiceComb sample project > for user guiding purpose. > > Hi, All > > Recently, I communicated with some ServiceComb new users, they want an > e-commerce system ServiceComb sample project with real business background. > They think with this demo they can learn ServiceComb’s abilities and > usages *more efficiently*. > > Then I found this project https://github.com/apache/servicecomb-samples. > So I want to develop an e-commerce system demo and *devote* it to this > project as this project’s sub-project. > -- > The business background of my planing project: > > Traditionally, a real estate developer in china will show their nearing > completion buildings to the customers for a couple of days, then determine > an open sale time for all customers to make real deal offline. Those > customers have to get to sale place long before the open sale time and > queue up,because only in this way they get the chances to pick the > apartment which they like mostly. So recently, more and more real estate > developers begin to build an online apartments/houses open sale system. The > e-commerce system help their customer to pick the houses more easily and > more fairly. This is the system which I plan to build with ServiceComb. > Why I choose this project as a guiding sample of ServiceComb? > > Real estate developers use this system to make a deal with their customer > online. So, yes! This is a real e-commerce system with real commercial > value. But this is also a real simple e-commerce system which has no > payment and shipping module. So Its simplicity is good for the guiding > purpose. Meanwhile, because these trading subjects of this system are very > expensive，and there will be high QPS when the open sale time just arrives. > So There are high requirements for the system’s scalability, availability > and robustness.It’s an applicable project to show ServiceComb’s abilities. > Any questions and suggestions? > > -- > Best Wishes & Regards > ——— > Alec Zheng > -- Best Wishes & Regards ——— Alec Zheng
Re: [DISCUSSION] Async support for Saga
I rethink the idea I proposed, yes, provide low level apis is a bad idea,
and I also don't suggest that let user code use omega-xxx-transport api.
I think the essential issues are three:
1. How to pass tx context info across threads
2. How to asynchronously tell Alpha that Saga is ended or aborted, which
means not triggered on @SagaStart method returns.
3. How to asynchronously tell Alpha that LocalTx is ended or aborted,
which means not triggered on @Compensable method returns.
I think we can keep using @SagaStart @Compensable for the XXXStartedEvent,
and provide a helper to manually end/abort Saga/LocalTx. Thanks for PR #506
(SCB-1385) we can use TransactionContext to achieve that. Below is a code
sample:
@SagaStart(async=true)
public void foo() {
TransactionContext txContext = OmegaContext.getTransactionContext();
someAsyncCall()
.onSuccess(Callback() {
omega.endSaga(txContext);
})
.onException(Callback() {
omega.abortSaga(txContext);
})
}
@Compensable(async=true, compensationMethod="rollbackBar")
public void bar() {
TransactionContext txContext = OmegaContext.getTransactionContext();
someAsyncCall()
.onSuccess(Callback() {
omega.endTx(txContext);
})
.onException(Callback() {
omega.abortTx(txContext);
})
}
The async attribute on @SagaStart and @Compensable prevents Saga/LocalTx
ended when method returns.
TransactionContext object can be passed around safely because it's
immutable.
What I have not considered clearly is that how to deal with compensation
method if it's also async.
Willem Jiang 于2019年7月20日周六 下午10:30写道：
>
> Yeah, I agree we need provide some low level API for the user to pass.
> In the recent change of SCB-1386, I introduce the TransactionContext
> object which holds the reference of GID and LID, we may add some other
> transaction context information there too.
> If the sub transaction is happened in other JVM, we need to pass the
> TxContext across the JVM with help of omega-xxx-transport.
>
> We already have some internal API to send the message from Omega to
> Alpha, I prefer to use annotation instead of expose low level API to
> the user.
>
> Willem Jiang
>
> Twitter: willemjiang
> Weibo: 姜宁willem
>
> On Sat, Jul 20, 2019 at 9:50 PM Daniel Qian wrote:
> >
> > After look into SCB-163, SCB-1385 and SCB-1386 I have some thoughts on
Saga
> > involved in async invocation.
> > Current implementation is basically based on sync invocation, there are
> > some assumption:
> >
> >1. When @SagaStart method returns, the Saga finished.
> >2. When @Compensable method returns/throws exception, the Local Tx
> >succeeds/failed.
> >3. When compensationMethod returns, the Local Tx is compensated.
> >
> > Even if considering what SCB-100 provided:
> >
> >1. Add @OmegaContextAware annotation enabling
> >java.util.concurrent.Executor inject OmegaConext into threads it
> >manages/spawns
> >2. Make OmegaContext use InheritableThreadLocal field let child
thread
> >inherit parent thread's Local Tx info
> >
> > There are still some limitations:
> >
> >1. @OmegaContextAware is only viable if you use spring framework
> >2. @OmegaContextAware and OmegaContext's InheritableThreadLocal field
> >assuming that the calling thread or initator thread has Local Tx
info.
> >
> >
> > What if user code use producer-consumer pattern in which
> > InheritableThreadLocal can't work?
> > What if user code use a thread scheduling library which we cannot use
> > @OmegaContextAware,RxJava and Reactor, for example?
> > I think we could provide some low-level APIs that user code can manualy
> > starts/ends Saga and Local Tx, something like below:
> >
> > TxContext context = omega.startSaga();
> > TxContext subTxContext = omega.startTx(TxContext parentTxContext);
> > omega.endTx(TxContext);
> > omega.abortTx(TxContext);
> > omega.abortSaga(TxContext);
> > omega.endSaga(TxContext);
> >
> > TxContext is just a immutable dto like this:
> >
> > public class TxContext {
> > private final String globalTxId;
> > private final String localTxId;
> > }
> >
> > Above is a just a rough idea. So any thoughts?
> > --
> > Daniel Qian
> >
> > 博客：https://segmentfault.com/u/chanjarster
> > github：https://github.com/chanjarster
--
Daniel Qian
博客：https://segmentfault.com/u/chanjarster
github：https://github.com/chanjarster
