Re: [aspectwerkz-user] Hot deploying aspects

in such a scenario, you should deploy the aspect to a deployment scope.
Only the deployment scope will have to be defined in the aop.xml file.
Alex

On 4/20/05, Edwards, John C (Credit) <[email protected]> wrote:
> I have a simple example of hot deploying aspects which I'm trying to get
> working. I have a simple aspect which is a field interceptor for a
> collection. In my aspect I have two methods for deploying and undeploying
> the aspect:
> 
>   public static void undeployAspect(String aspectName){
>         Deployer.undeploy(aspectName,ClassLoader.getSystemClassLoader());
>     }
> 
>     public static void deployAspect(String aspectName, String
> collectionName) {
>         String xmlDef = "<aspect name='" + aspectName
>                 + "'
> class='"+FieldInterceptionAspect.class.getClass().getName()+"'
> deployment-model='perClass'>"
>                 + "<pointcut name='interceptGet' expression='get(Collection
> "+collectionName+")' />"
>                 + "</aspect>";
>         System.out.println(xmlDef);
>         Deployer.deploy(FieldInterceptionAspect.class, xmlDef);
>     }
> 
> If I put an entry in aop.xml then the aspect is deployed to begin with and
> then it appears I can undeploy it and redeploy it. Great. But I'd like to
> move to a situation where aop.xml can be empty and I do everything (i.e.
> register, set the pointcut and deploy) at runtime. Note that when aop.xml is
> empty, my main class fails after the first call to Deployer.deploy(..)
> 
>   public static void main(String args[]) {
>          Company company = new Company();
>          if(company.offices !=null){
>              throw new RuntimeException("Offices should be null");
>          }
> 
>          FieldInterceptionAspect.deployAspect("fieldInterceptor",
> "com.quantboy.domain.Company.offices");
>          Company company1 = new Company();
>          if(company.offices ==null){
>              throw new RuntimeException("Offices should not be null after
> hot deployment");
>          }
> 
>          FieldInterceptionAspect.undeployAspect("fieldInterceptor");
>          Company company2 = new Company();
>          if(company2.offices!=null){
>              throw new RuntimeException("Offices should be null after Aspect
> is hot undeployed");
>          }
> 
>          FieldInterceptionAspect.deployAspect("fieldInterceptor",
> "com.quantboy.domain.Company.offices");
>          Company company3 = new Company();
>          if(company3.offices==null){
>              throw new RuntimeException("Locations should not be null after
> Aspect is hot deployed");
>          }
> 
> Am I trying to do something which is impossible? I'm quite fuzzy about the
> notion of hot-deploying. Can one only hot deploy an aspect which is
> prespecified in aop.xml ?
> 
> Regards,
> 
> 
> John
>