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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-8750) Change the variable s_logger to non-static and fixed its name in “com.cloud.utils.component.ComponentLifecycleBase” and its subclasses
Date Wed, 16 Sep 2015 07:45:47 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-8750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14747094#comment-14747094
] 

ASF GitHub Bot commented on CLOUDSTACK-8750:
--------------------------------------------

Github user wilderrodrigues commented on the pull request:

    https://github.com/apache/cloudstack/pull/778#issuecomment-140658135
  
    All,
    
    Given the current blocker issues we have to fix on master in order to release 4.6.0 and
the fact that those changes don't really improve the current code base, I will :-1:  this
PR and will object if this PR gets 2 LGTMs.
    
    @rafaelweingartner, please have a look at the dev-list in order to see the proposal for
PRs and how they should be created.
    
    In addition, for your students with less experience with Java/Eclipse/Maven/Git, try to
avoid giving them such a huge task.
    
    Cheers,
    Wilder


> Change the variable s_logger to non-static and fixed its name in “com.cloud.utils.component.ComponentLifecycleBase”
and its subclasses
> --------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CLOUDSTACK-8750
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8750
>             Project: CloudStack
>          Issue Type: Improvement
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Management Server
>            Reporter: pedro henrique pereira martins
>            Assignee: pedro henrique pereira martins
>            Priority: Minor
>             Fix For: Future
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> We have noticed that every single class that is a subclass of “ComponentLifecycleBase”
instantiate their on “logger” manually and uses a nonstandard name. We fixed that by changing
the variable in “ComponentLifecycleBase” to protected and non-static and instantiated
it using the method “getClass” from Object class. Therefore, we can reduce the code in
a few hundred lines and use a more intuitive name for the logger variable.
> We do understand that “s_ something“ is a proper way to instantiate a static variable
in ACS classes. However, in few of the subclasses of “com.cloud.utils.component.ComponentLifecycleBase”
it was used names such as “LOGGER” (that is a proper name for static field as JAVA standards),
log, status_logger and others.
> What we propose is to change the logger variable in “com.cloud.utils.component.ComponentLifecycleBase”
to protected and remove its static and final declaration. Therefore we did the following in
ComponentLifecycleBase:
>    protected Logger logger = Logger.getLogger(getClass());
>   This way, every single subclass of ComponentLifecycleBase, when instantiated would
automatically have a logger instance for its proper class ready to be used.
> During that process we found a static method in class that used the “s_logger” variable
in classes:
> com.cloud.network.element.VirtualRouterElement 
> org.apache.cloudstack.network.element.InternalLoadBalancerElement 
> To fix that we proposed to create a new class 
> “com.cloud.network.element.HAProxyLBRule”, instantiate it with @Componente and inject
into the aforementioned classes.
> That class will contain the following methods extracted from com.cloud.network.element.VirtualRouterElement
class:
> com.cloud.network.element.HAProxyLBRule.containsOnlyNumbers(String, String)
> com.cloud.network.element.HAProxyLBRule.validateHAProxyLBRule(LoadBalancingRule)
> However we don't know if all analyzed classes are singletons, if some of analyzed classes
aren't singletons. Therefore that change could have an impact on memory consumption. It will
require a deeper analysis to check which classes are singleton or not and leave the “logger”
as static in such classes.  
> We have a solution at our own branch 
> https://github.com/rafaelweingartner/cloudstack/tree/master-lrg-cs-hackday-003
> However, there is still the need to double-check the singleton problem.
> There is a PR we created in our first attempt to solve that problem:
> https://github.com/apache/cloudstack/pull/714
> The dev that starts working on this ticket can reach us at any moment, hence that we
have mapped all of ComponentLifecycleBase subclasses that use the logger variable.



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