[GitHub] meisam opened a new pull request #48: [LIVY-41] Let users access sessions by session name

[GitBox <gi...@apache.org>]

meisam opened a new pull request #48: [LIVY-41] Let users access sessions by session name
URL: https://github.com/apache/incubator-livy/pull/48
 
 
   This commit  enables Livy users to access sessions either by names or by auto-generated sessiond id's.
   
   It also prevents users from creating sessions that have the same name.
   
   This commit keeps API change  minimal. Thse are palces that API change
   is needed:
   - `Session` and its subclasses adds a new field, `name`.
   - `RecoveryMetadata` and its subclasses adds a new field, `name`.
   - `SessionManager` adds a new method `getSession(name: String)` which lookups sessions by name.
   
   A more clean implementation would change the signature of `SessionManager.register` so it returns a proper container around the session value to determine if it failed to register the given session.  For example,
   ```Scala
   def register(session S): Either[S, Throwable]
    ```
   
   Task-url: https://issues.apache.org/jira/browse/LIVY-41

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