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Home » Archived » Buckminster » Understanding uptodatepolicy(Avoid regenerating Xtext language artifact during each build)
Understanding uptodatepolicy [message #647530] Thu, 06 January 2011 20:07 Go to next message
Tobias Kniep is currently offline Tobias KniepFriend
Messages: 13
Registered: June 2010
Junior Member
Hello,

I'm quite new to Buckminster and trying to set up a build enviroment for our Xtext projects.

I got as far as being able to make Buckminster trigger the mwe2 workflow for generating the Xtext language artifacts before running the eclipse.build action. To achieve this, I added a CSPEX extension to the project which basically adds the src-gen folder as a prerequisite to the eclipse.build action and adds the action 'gen.xtext.artifacts' for running the mwe2 workflow (using an ANT script):

<?xml version="1.0" encoding="UTF-8"?>
<cspecExtension
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:bc="http://www.eclipse.org/buckminster/Common-1.0"
	xmlns="http://www.eclipse.org/buckminster/CSpec-1.0">	
	<artifacts>
	    <private name="mydsl.src" base="${buckminster.home}/src/">
	       <path path="org/xtext/example/mydsl/MyDsl.xtext"/>	       
	    </private>	
	</artifacts>
	
	<actions>	
        <public name="gen.xtext.artifacts" actor="jdt.ant">
            <actorProperties>
                <property key="buildFile" value="gen_code.xml" />
            </actorProperties>
            <prerequisites>
                <attribute name="mydsl.src" alias="grammar"/>                                             
            </prerequisites>
            <products alias="output">
                <private name="sources.generated" path="${buckminster.home}/src-gen/" />                
            </products>
        </public>
    </actions>

    <alterActions>
        <private name="eclipse.build">
            <alterPrerequisites>
                <attribute name="sources.generated"/>		        
            </alterPrerequisites>
        </private>
    </alterActions>
	   
</cspecExtension>


Now, I want to have the gen.xtext.artifacts action only executed if the MyDSl.xtext file actually changed but I'm unable to get it working. It just runs every time.

From what I read in the BuckyBook I assume that I could use an updatepolicy of COUNT to make the action run as soon as the MyDsl.xtext file is younger than all files in src-gen:

<actions>	
        <public name="gen.xtext.artifacts" actor="jdt.ant">
            <actorProperties>
                <property key="buildFile" value="gen_code.xml" />
            </actorProperties>
            <prerequisites>
                <attribute name="mydsl.src" alias="grammar"/>                                             
            </prerequisites>
            <products alias="output" upToDatePolicy="COUNT" fileCount="1">
                <private name="sources.generated" path="${buckminster.home}/src-gen/" />                
            </products>
        </public>
    </actions>


But it keeps always executing that action. Even if I use the NOT EMPTY upToDatePolicy the action is invoked each time.

Do you have any idea where my problem might be or how I can find out why Buckminster decides that the
action needs to be invoked?

Thanks,
Tobias

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Re: Understanding uptodatepolicy [message #647585 is a reply to message #647530] Fri, 07 January 2011 07:53 Go to previous messageGo to next message
Thomas Hallgren is currently offline Thomas HallgrenFriend
Messages: 3240
Registered: July 2009
Senior Member
Setting loglevel DEBUG might give you some more info. It should then log some info about why it thinks the product needs
to be rebuilt.

- thomas

On 2011-01-06 21:07, Tobias wrote:
> Hello,
>
> I'm quite new to Buckminster and trying to set up a build enviroment for our Xtext projects.
>
> I got as far as being able to make Buckminster trigger the mwe2 workflow for generating the Xtext language artifacts
> before running the eclipse.build action. To achieve this, I added a CSPEX extension to the project which basically adds
> the src-gen folder as a prerequisite to the eclipse.build action and adds the action 'gen.xtext.artifacts' for running
> the mwe2 workflow (using an ANT script):
>
>
> <?xml version="1.0" encoding="UTF-8"?>
> <cspecExtension
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> xmlns:bc="http://www.eclipse.org/buckminster/Common-1.0"
> xmlns="http://www.eclipse.org/buckminster/CSpec-1.0">
> <artifacts>
> <private name="mydsl.src" base="${buckminster.home}/src/">
> <path path="org/xtext/example/mydsl/MyDsl.xtext"/> </private>
> </artifacts>
>
> <actions>
> <public name="gen.xtext.artifacts" actor="jdt.ant">
> <actorProperties>
> <property key="buildFile" value="gen_code.xml" />
> </actorProperties>
> <prerequisites>
> <attribute name="mydsl.src" alias="grammar"/> </prerequisites>
> <products alias="output">
> <private name="sources.generated" path="${buckminster.home}/src-gen/" /> </products>
> </public>
> </actions>
>
> <alterActions>
> <private name="eclipse.build">
> <alterPrerequisites>
> <attribute name="sources.generated"/> </alterPrerequisites>
> </private>
> </alterActions>
> </cspecExtension>
>
> Now, I want to have the gen.xtext.artifacts action only executed if the MyDSl.xtext file actually changed but I'm unable
> to get it working. It just runs every time.
> From what I read in the BuckyBook I assume that I could use an updatepolicy of COUNT to make the action run as soon as
> the MyDsl.xtext file is younger than all files in src-gen:
>
>
> <actions>
> <public name="gen.xtext.artifacts" actor="jdt.ant">
> <actorProperties>
> <property key="buildFile" value="gen_code.xml" />
> </actorProperties>
> <prerequisites>
> <attribute name="mydsl.src" alias="grammar"/> </prerequisites>
> <products alias="output" upToDatePolicy="COUNT" fileCount="1">
> <private name="sources.generated" path="${buckminster.home}/src-gen/" /> </products>
> </public>
> </actions>
>
>
> But it keeps always executing that action. Even if I use the NOT EMPTY upToDatePolicy the action is invoked each time.
>
> Do you have any idea where my problem might be or how I can find out why Buckminster decides that the action needs to be
> invoked?
>
> Thanks,
> Tobias
>

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Re: Understanding uptodatepolicy [message #647591 is a reply to message #647585] Fri, 07 January 2011 09:00 Go to previous message
Tobias Kniep is currently offline Tobias KniepFriend
Messages: 13
Registered: June 2010
Junior Member
Hello Thomas,

thanks for your reply. The loglevel is set to DEBUG and I get plenty of output but I don't find
anything about upToDate checks. The output starts with: 

Actions to perform (in order)
  org.xtext.example.mydsl:osgi.bundle$1.0.0#gen.xtext.artifacts
  org.xtext.example.mydsl:osgi.bundle$1.0.0#eclipse.build
  org.xtext.example.mydsl:osgi.bundle$1.0.0#bundle.jar
[start org.xtext.example.mydsl:osgi.bundle$1.0.0#gen.xtext.artifacts]

 ... property output ...

Emitting classpath for project org.xtext.example.mydsl...
 java project, contains 42 entries

 ... classpath output ...

[ant] Buildfile: C:\Workspace\org.xtext.example.mydsl\gen_code.xml
[ant] Grammar = C:\Workspace\org.xtext.example.mydsl\src\org\xtext\example\mydsl\MyDsl.xtext
[ant] 
[ant] gen.xtext.artifacts:
[end org.xtext.example.mydsl:osgi.bundle$1.0.0#gen.xtext.artifacts]
[start org.xtext.example.mydsl:osgi.bundle$1.0.0#eclipse.build]
...


I would expect information about the up to date check somewhere before the 
[start org.xtext.example.mydsl:osgi.bundle$1.0.0#gen.xtext.artifacts]
part or am I wrong?

Regards,
Tobias

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