Move DataSourceServiceImpl to core module

[penghuo]

Signed-off-by: Peng Huo penghuo@gmail.com

Concepts

• DataSourceService: manage DataSource.
  • DataSourceService is constructed by the list of DataSourceFactory at OpenSearch servcie bootstrap time. The list of DataSourceFactory is immutable.
  • Client could add DataSource defined by DataSourceMetaData at any time. DataSourceService use DataSourceFactory to create DataSource.
• DataSourceFactory: Each data source (prometheus, opensearch) MUST define DataSourceFactory and register to DataSourceService. DataSourceFactory is one instance per JVM.
• DataSource: Each user configured datasource mapping to one instance of DataSource per JVM.
• DataSourceType: Pre-defined datasource type. Currently, PROMETHEUS and OPENSEARCH are supported.

Description

1. In Catalog to Datasource changes #1027, we change the catalog to datasource in doc. In this PR. we change the major class name from catalog to datasource to make it sync with doc.
2. Move DataSourceServiceImpl from Plugin module to Core module. And refactor the interface.
   • replace registerDefaultOpenSearchCatalog() with void addDataSource(DataSourceMetadata dataSourceMetadata);
   • add clear() interface.

To Reviewrs

1. You can ignore most of files which only change names. and focus on
   • DataSourceServiceImpl and DataSourceServiceImplTest
   • SQLPlugin
   • DataSourceFactory

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #1084 (457b2e2) into 2.x (fef20f8) will decrease coverage by 2.52%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                2.x    #1084      +/-   ##
============================================
- Coverage     98.27%   95.75%   -2.53%     
- Complexity     3434     3449      +15     
============================================
  Files           343      355      +12     
  Lines          8542     9233     +691     
  Branches        544      665     +121     
============================================
+ Hits           8395     8841     +446     
- Misses          142      334     +192     
- Partials          5       58      +53     

Flag	Coverage Δ
query-workbench	62.76% <ø> (?)
sql-engine	98.28% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ensearch/sql/datasource/DataSourceServiceImpl.java	100.00% <100.00%> (ø)
...pensearch/storage/OpenSearchDataSourceFactory.java	100.00% <100.00%> (ø)
...l/prometheus/storage/PrometheusStorageFactory.java	100.00% <100.00%> (ø)
...h/public/components/QueryLanguageSwitch/Switch.tsx	85.71% <0.00%> (ø)
workbench/public/utils/PanelWrapper.tsx	100.00% <0.00%> (ø)
workbench/public/components/app.tsx	0.00% <0.00%> (ø)
...ublic/components/QueryResults/QueryResultsBody.tsx	68.32% <0.00%> (ø)
workbench/public/components/Header/Header.tsx	100.00% <0.00%> (ø)
...ch/public/components/QueryResults/QueryResults.tsx	61.60% <0.00%> (ø)
workbench/public/components/PPLPage/PPLPage.tsx	56.52% <0.00%> (ø)
... and 3 more

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[vamsi-amazon]

@penghuo I have also made some changes in local for this PR. Have you removed all the references? Should I stop working on this?

[penghuo]

@penghuo I have also made some changes in local for this PR. Have you removed all the references? Should I stop working on this?

you can continue your work. I will merge this PR base on your code change.

[vamsi-amazon]

LGTM. Thanks for the changes.

[dai-chen]

Thanks for the refactoring!