Re: redirect from render phase

[Thiago H de Paula Figueiredo]

On Thu, 16 Jan 2014 05:49:09 -0200, Andrey andreus...@gmail.com wrote:


Hello!


Hi!


We are in need of redirect from render phase.
Reasons are: we cannot fetch all required data in onActivate method of
page, because onActivate is called for page even for component events
inside page.
So we load data in setupRender. But there can be problems like data not
found, service unavailable etc.


You don't need to load data in setupRender or onActivate() in most cases.  
Suppose you're using Grid to list some data fetched from a database.  
Instead of


@Property
private ListUser data;

void setupRender() {
data = someMethodThatReturnsYourData();
}

and a template like this: table t:type=Grid t:source=data/, you can  
keep the template and fetch the data in a getter:


// this annotation guarantees the method body will be actually called only  
once per

// request, even if the method is called many times in the same request
@Cached
public ListUser getData() {
return someMethodThatReturnsYourData();
}

In onActivate(), or any other method, you can check whether it's a page  
request or not:


@Inject
private Request request;

@Inject
private ComponentEventLinkEncoder componentEventLinkEncoder;

boolean pageRequest =  
componentEventLinkEncoder.decodePageRenderRequest(request) != null;



Is there any correct way in tapestry to redirect during render?


No.

--
Thiago H. de Paula Figueiredo
Tapestry, Java and Hibernate consultant and developer
http://machina.com.br

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Re: redirect from render phase

[Geoff Callender]

This may help:


http://jumpstart.doublenegative.com.au/jumpstart/examples/infrastructure/handlingabadcontext/1

Geoff

On 16/01/2014, at 6:49 PM, Andrey wrote:

 Hello!
 
 We are in need of redirect from render phase.
 Reasons are: we cannot fetch all required data in onActivate method of
 page, because onActivate is called for page even for component events
 inside page.
 So we load data in setupRender. But there can be problems like data not
 found, service unavailable etc.
 
 To solve this we've made our own RedirectException, and exception handler
 that catches it and performs redirect.
 
 The last problem we have is spam in logs, that goes from RenderQueueImpl
 class.
 
 Is there any correct way in tapestry to redirect during render?
 
 With best regards, Andrey.


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Re: redirect from render phase

[Andrey]

Finally we've solved spam problem (but my collegues are not very happy with
this entire approach):
we use log4j matcher to skip error log message from RenderQueueImpl, and
log it if needed in our exception handler.

p.s. getters do not help, because they will throw exceptions too when data
unavailable.
page request check looks better but, imho, code would become much harder to
understand and support.


2014/1/16 Thiago H de Paula Figueiredo thiag...@gmail.com

 On Thu, 16 Jan 2014 05:49:09 -0200, Andrey andreus...@gmail.com wrote:

  Hello!


 Hi!


  We are in need of redirect from render phase.
 Reasons are: we cannot fetch all required data in onActivate method of
 page, because onActivate is called for page even for component events
 inside page.
 So we load data in setupRender. But there can be problems like data not
 found, service unavailable etc.


 You don't need to load data in setupRender or onActivate() in most cases.
 Suppose you're using Grid to list some data fetched from a database.
 Instead of

 @Property
 private ListUser data;

 void setupRender() {
 data = someMethodThatReturnsYourData();
 }

 and a template like this: table t:type=Grid t:source=data/, you can
 keep the template and fetch the data in a getter:

 // this annotation guarantees the method body will be actually called only
 once per
 // request, even if the method is called many times in the same request
 @Cached
 public ListUser getData() {
 return someMethodThatReturnsYourData();
 }

 In onActivate(), or any other method, you can check whether it's a page
 request or not:

 @Inject
 private Request request;

 @Inject
 private ComponentEventLinkEncoder componentEventLinkEncoder;

 boolean pageRequest = 
 componentEventLinkEncoder.decodePageRenderRequest(request)
 != null;


  Is there any correct way in tapestry to redirect during render?


 No.

 --
 Thiago H. de Paula Figueiredo
 Tapestry, Java and Hibernate consultant and developer
 http://machina.com.br

 -
 To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org
 For additional commands, e-mail: users-h...@tapestry.apache.org




-- 
откланиваюсь,
Андрюха

Re: redirect from render phase

[Thiago H de Paula Figueiredo]

On Thu, 16 Jan 2014 10:41:55 -0200, Andrey andreus...@gmail.com wrote:

Finally we've solved spam problem (but my collegues are not very happy  
with

this entire approach):
we use log4j matcher to skip error log message from RenderQueueImpl, and
log it if needed in our exception handler.

p.s. getters do not help, because they will throw exceptions too when  
data unavailable.


Then this is normal exception handling.

--
Thiago H. de Paula Figueiredo
Tapestry, Java and Hibernate consultant and developer
http://machina.com.br

-
To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org
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Re: redirect from render phase

[Andrey]

But in addition our exception handler extracts redirect destination from
our custom exception and performs redirect.
16.01.2014 17:08 пользователь Thiago H de Paula Figueiredo 
thiag...@gmail.com написал:

 On Thu, 16 Jan 2014 10:41:55 -0200, Andrey andreus...@gmail.com wrote:

  Finally we've solved spam problem (but my collegues are not very happy
 with
 this entire approach):
 we use log4j matcher to skip error log message from RenderQueueImpl, and
 log it if needed in our exception handler.

 p.s. getters do not help, because they will throw exceptions too when
 data unavailable.


 Then this is normal exception handling.

 --
 Thiago H. de Paula Figueiredo
 Tapestry, Java and Hibernate consultant and developer
 http://machina.com.br

 -
 To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org
 For additional commands, e-mail: users-h...@tapestry.apache.org

redirect from render phase

[Andrey]

Hello!

We are in need of redirect from render phase.
Reasons are: we cannot fetch all required data in onActivate method of
page, because onActivate is called for page even for component events
inside page.
So we load data in setupRender. But there can be problems like data not
found, service unavailable etc.

To solve this we've made our own RedirectException, and exception handler
that catches it and performs redirect.

The last problem we have is spam in logs, that goes from RenderQueueImpl
class.

Is there any correct way in tapestry to redirect during render?

With best regards, Andrey.