On Wed, Apr 30, 2008 at 12:52 PM, Simon Laws <[EMAIL PROTECTED]> wrote:
> > > On Wed, Apr 30, 2008 at 12:40 PM, ant elder <[EMAIL PROTECTED]> wrote: > > > > > > > On Wed, Apr 30, 2008 at 12:00 PM, Simon Laws <[EMAIL PROTECTED]> > > wrote: > > > > > > > > > > > On Wed, Apr 30, 2008 at 11:12 AM, ant elder <[EMAIL PROTECTED]> > > > wrote: > > > > > > > Bring this comment to the dev list: > > > > > > > > "The tuscany web app support doesn't use this evolving node > > > > implementation > > > > just yet. I don't imagine it would be difficult to plug it in ...." > > > > - http://apache.markmail.org/message/4hvdrcafhapy3kyy > > > > > > > > Coincidentally i was having a look at this just the other day after > > > > that > > > > user posted about support for Tomcat with multiple webapps in the > > > > same SCA > > > > domain - http://apache.markmail.org/message/ttssxoruzpndkado. > > > > > > > > Could you give any pointers at all on where to start with using this > > > > evolving node implementation like this? Theres no doc and I'm a bit > > > > lost on > > > > even which Tuscany modules, samples or tests are current. What I'd > > > > like to > > > > do is start exploring the updating of the old runtime-tomcat code to > > > > use the > > > > latest domain stuff so that as Tomcat starts up webapps are detected > > > > as SCA > > > > contributions and added to a single Tomcat SCA domain. One issue > > > > that I > > > > remember came up last time doing this is that as this happens during > > > > Tomcat > > > > startup no http communication can take place so all the > > > > registrations of > > > > contributions with the domain need to be in-vm. > > > > > > > > ...ant > > > > > > > > > > Hi Ant > > > > > > Am keen to work with you on this. While svn has been down I've spent > > > time to resurrect a load balancing demo I have on my local disc (not > > > checked > > > in yet) and would like to update the webapps I'm using to the lasted > > > domain > > > code but of course I can't. > > > > > > Here's a summary of what I think is current in terms of > > > domain/node/runtime support (but have to admit that there is an amount of > > > guessing here)..... > > > > > > sca/distribution/standalone - not sure but think it's redundant - > > > forerunner of runtime-standalone? > > > sca/distribution/tomcat - not sure but think it's redundant - > > > forerunner of runtime-tomcat? > > > sca/distribution/war - not sure but think it's redundant - forerunner > > > of runtime-war? > > > sca/distribution/webapp - not sure but think it's redundant > > > sca/modules/domain - old domain SPI > > > sca/modules/domain-api - old domain API > > > sca/modules/domain-impl - old domain Implementation - has been > > > superseded by domain-manager > > > sca/modules/domain-manager - new domain management application - > > > replaces domain-impl > > > sca/modules/host-embedded - original single JVM domain implementation > > > - still used in most samples > > > sca/modules/host-webapp - original webapp runtime - fires up tuscany > > > based on web.xml filter > > > sca/modules/host-webapp-junit - not sure but have a feeling it's > > > something to do with running itests in different web containers > > > sca/modules/node - old node SPI > > > sca/modules/node-api - old node API > > > sca/modules/node-impl - old node implementation that runs one or more > > > composites in a single JVM as part of a distributed domain > > > sca/modules/node2-api - new node API > > > sca/modules/node2-impl - new node implementation. This node is coded > > > to read it's configuration as an atom feed from the new domain-manager > > > sca/modules/node2-launcher - start up a node from the command line > > > sca/modules/node2-launcher-webapp - had noticed this before - maybe > > > node2 integration with webapps has been looked at. Let's see! > > > sca/modules/runtime - I think this was the last attempt at providing a > > > common runtime baseline to be specialized for different environments > > > sca/modules/runtime-standalone - command line runtime > > > sca/modules/runtime-tomcat - deep tomcat integration (IIRC) > > > sca/modules/runtime-war - war rutime > > > sca/modules/workspace - SPI for some of the machinery required to > > > process contributions at the domain level. Used by domain-manager > > > sca/modules/workspace-impl - Implementation of the workspace > > > sca/modules/workspace-xml - Reading/writing workspace as XML > > > > > > So can we get together here and work out what the true picture is and > > > how to mode modules/runtime* to node2. First things first I'm going to go > > > look at node2-launcher-webapp. > > > > > > I think the start up process for nodes in a webapp will potentially be > > > easier now as the node is just reading atom feeds and not making soap > > > calls. > > > Time will tell! > > > > > > Simon > > > > > > > Great, working together would be good and i'm sure make getting > > somewhere useful happen much quicker :) > > > > Thanks for the list of module statuses thats helpful, i'll also go look > > the node2-launcher-webapp one. > > > > The comment on the use of atom feeds is interesting. To be honest i'd > > hope we could have a way to avoid that being needed in this Tomcat use case, > > or at least being optional. One issue we had last time when we tried to do > > this was that there had to be a separate standalone "domain manager" running > > before you could start up a Tomcat instance, and that sucks quite a bit IMHO > > so i'd like to try to get a design from the beginning where its not needed. > > This will all be happening in a single JVM and with the code bootstrapping > > Tuscany being at the "top" classloader so everything should be accessible to > > just make direct SPI calls to configure a domain instead of going via a > > remote binding shouldn't it? There have been some emails recently about the > > domain/workspace SPIs i guess i need to go read more closely what they were > > about. > > > > ...ant > > > > > Also, the node is setup so that there are several ways to provide the > details of the composite/contributions that it needs (this is what started > this off on the user list). When I say that the node is configured via an > atom feed what this means is that the node reads the URL of the composite to > run and the contributions that requires from and atom feed. It then uses > these URLs to go get the composite/contributions in question. You can > provide these URLs directly without using the feed. For example, I updated > the validation tests, e.g [1], to make the latest node read from the file > system. No domain manager involved. Here's the code... > > SCANode2Factory nodeFactory = SCANode2Factory.newInstance(); > node = nodeFactory.createSCANode(new > File("src/main/resources/DuplicateComponentName/Calculator.composite").toURL().toString(), > new > SCAContribution("TestContribution", > > new > File("src/main/resources/DuplicateComponentName").toURL().toString())); > node.start(); > calculatorService = ((SCAClient)node).getService(CalculatorService.class, > "CalculatorServiceComponent"); > > So a little bit more complicated that what we have in host-embedded. The > parameters to this version of createSCANode are > > URL to composite > List of Contributions (each having a URI and a URL) > > I quite like this very explicit specification but we could add the helper > method back in so, for sample running, we could do something like > > node = > SCANode2Factory.createSCANodeWithComposite("DuplicateComponentName/Calculator.composite"); > > Regards > > Simon > > [1] > http://svn.apache.org/repos/asf/incubator/tuscany/java/sca/itest/validation/src/test/java/calculator/DuplicateComponentNameTestCase.java Cool thats really helpful. Ok so if we can have a Tomcat TuscanyHost (i.e. an extension of org.apache.catalina.core.StandardHost not related to the Tuscany host stuff) that will get its addChild method called for each webapp and we can get a File to the root of the webbapp so call nodeFactory.createSCANode with that and treat each webapp as a seperate contribution which seems reasonable. That would give us a node per webapp which i'm not sure is good or bad till theres some answers to the "what is a node" question. How do nodes talk to each other or become part of a bigger domain? Theres nothing in SCANode2Factory.newInstance().createSCANode or node.start that mentions anything about any domain? ...ant
