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When creating a host containing two servers of the same kind, only one is shown in the Remote Systems. Note that if more than 2 are added, the subsystems shown are the expected - 1. After restarting RSE, only 1 subsystem is shown. A test code to reproduce the issue could be: IHost conn = registry.createHost("Discovery", "name", "name", "description"); SystemRegistry registry = RSEUIPlugin.getDefault().getSystemRegistry(); ISubSystemConfiguration sub1 = registry.getSubSystemConfiguration("ftp.files"); ISubSystemConfiguration sub2 = registry.getSubSystemConfiguration("ftp.files"); registry.createSubSystems(conn, new ISubSystemConfiguration[]{sub1,sub2}); It is necessary to support more than one server of the same kind, as one target can present more than one server (in different ports) such as FTP or telnet servers.
There are some issues with having multiple subsystems of the same kind. Below is a capture of the discussion we had on http://wiki.eclipse.org/index.php?title=DSDP/TM/Committer_Phone_Meeting_20-Mar-2007 # DaveM: wants to switch service for a given subsystem after created. Wants to share "File" filters between services. Wants to share user actions between multiple shells; Uwe: will need to change context menu actions; # DaveM: What file subsystem to link with the editor? # DaveM: Refresh events - when a new file is created under a folder, all file subsystems should be refreshed -- multiple queries to subsystems; Martin -- we can do it today (and discovered issues when doing so), the only difference is that they are under different Host nodes # DaveM: Save in editor - which file subsystem do we use to upload? - first available or the one we opened with - path in the cache is the same! Right now, we keep track of the connection we used when opening the file (Martin: in the future, keep track of the subsystem) Summing up, it seems like 1. Once instanciated, should it be possible to change the service of a given subsystem at runtime? What if multiple subsystems with the same service result from this? - Martin thinks that changing the service at runtime is not a good idea. DaveM wants to have it changeable (what's the use case behind changing?) 2. What about filters - should they be the same for multiple subsystems of the same kind? Martin thinks no; DaveM thinks it is a bug if a filter created for FTP is not available after switching to dstore or ssh. 3. User actions created for shell service A should also be available for shell service B. 4. Current implementations which just take "the first IRemoteFileSubSystem" should be changed to take "the first connected" one 5. There might be a need to get subsystems sorted in a user-defined manner to clarify which one is the first 6. Same file accessed through multiple different channels can lead to caching and refresh issues - but we also have these right now when the same file is accessed through multiple channels below multiple host definitions. 7. Loading editor through subsystem A needs to also store it through the same subsystem - editor needs to remember 8. There might be menu enablement issues
Adding more subsystems of the same kind is interesting but also not easy to handle. It could be especially interesting with a polished wizard as requested by bug #176490. Deferring for now, to look at it again later.
