GitHub user ottobackwards opened a pull request:
https://github.com/apache/metron/pull/739
METRON-1165 [FEATURE-BRANCH] Add ability for BundleSystem to add bundles
after initialization
As part of supporting parser extensions and the bundle system hosted in
other applications than storm, and specifically for hosting in the rest
service, we need the ability to add new bundles to the system, preferably
without requiring an application restart or reloading the entire system.
The use case:
1. Install a parser extension assembly from the extension ui
2. switch to the sensor ui
3. create new instance (+) and be able to use the parser(s) from the
assembly you just installed.
This PR lays down the ground work for that capability, and will be
integrated with the extension ui branch if or when taken to the Feature Branch.
In this PR I further refactor the original NIFI Nar concept of Initial
Context, which is used in the BundleClassLoaders and the ExtensionManager. I
have moved the context to full classes, and moved their creation to those
classes in a Builder implementation.
This allows the creation of multiple 'contexts' with different parameters
and scopes.
I have also added the ability to merge one context into another.
Thus the idea is that:
- these classes have their initial context from the full scan of the bundle
system library directories.
- adding a new bundle means on demand creation of a new context, for just
that bundle
- we merge the bundles to make the new content available
The addXXXX capability is limited availability ( it is ```java protected
``` ).
It's only public facing exposure is through the BundleSystem class.
BundleSystem is the 'easy button', simplified interface to the bundles, and
should be in most cases the only interface required. Exposing it this way
allows us to be sure that the ADD calls are only called in a context where we
can do the type of locking we want to do.
## Testing
This is a preparation PR. The add functionality is not utilized outside
the tests.
So this is a code review, no regressions check.
- Build and Tests should run
- Full Dev should start and have data in kibana ( no regression )
- [x] Is there a JIRA ticket associated with this PR? If not one needs to
be created at [Metron
Jira](https://issues.apache.org/jira/browse/METRON/?selectedTab=com.atlassian.jira.jira-projects-plugin:summary-panel).
- [x] Does your PR title start with METRON-XXXX where XXXX is the JIRA
number you are trying to resolve? Pay particular attention to the hyphen "-"
character.
- [x] Has your PR been rebased against the latest commit within the target
branch (typically master)?
- [na] Have you included steps to reproduce the behavior or problem that is
being changed or addressed?
- [na] Have you included steps or a guide to how the change may be verified
and tested manually?
- [x] Have you ensured that the full suite of tests and checks have been
executed in the root metron
- [x] Have you written or updated unit tests and or integration tests to
verify your changes?
- [na] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [x] Have you verified the basic functionality of the build by building
and running locally with Vagrant full-dev environment or the equivalent?
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ottobackwards/metron ext-bundle-add
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/metron/pull/739.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #739
----
commit 4d294b9b5ea646e38f2ae6072e6f7f83277d65aa
Author: Otto Fowler <[email protected]>
Date: 2017-09-08T05:35:05Z
implement ability to add new bundles to system
----
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