Re: Session manager architecture

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Gabe Schine

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Dec 15, 2020, 1:34:15 PM12/15/20
to Shai Barack, Geevarghese V K, component-framework-dev, session-fr...@fuchsia.dev

Hello,

A great question. We are working to rectify this right now. The decision is a legacy one, and was made because when session_manager was introduced, it was not yet possible for tools like session_control to access services exposed by session_manager without putting a v1 component in its ancestral tree.

This restriction no longer exists.

Let us know if you have any other questions!
-Gabe

On Mon, Dec 14, 2020 at 9:24 PM Shai Barack <sha...@google.com> wrote:
I believe it's a temporary arrangement for testing. Adding Gabe who knows more. 

On Mon, Dec 14, 2020, 9:14 PM Geevarghese V K <jince...@gmail.com> wrote:
  Dear team,

session manager is a v2 component. Ideally all V2 components are handled by component manager. But there is a difference in the session framework architecture.

The session manager is ran by component_manager_sfw.cmx..eg:"fuchsia.session.ElementManager": [ "fuchsia-pkg://fuchsia.com/component_manager_sfw#meta/component_manager_sfw.cmx", "fuchsia-pkg://fuchsia.com/session_manager#meta/session_manager.cm" ]

Also the services in the emulator shows that 
 j: 17585             95.2M   95.1M
    p: 17636         2428.4k   2428k     36k         appmgr.cm
    j: 18716           92.8M   92.8M                 app
      j: 19342        700.4k    700k
        p: 19351      700.4k    700k     36k         sysmgr.cmx
      j: 19964         91.6M   91.5M                 sys

          j: 25835     1853.1k   1852k
                 p: 25860   1120.4k   1120k     36k         component_manager_sfw.cmx
                     j: 29329    304.4k    304k
                         p: 29633  304.4k    304k     36k         session_manager.cm
                     j: 30569    428.4k    428k
                         p: 30722  428.4k    428k     36k         workstation_session.cm

Why component_manager_sfw is used and why can't session manager be ran by component manager directly?

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Gabe Schine
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