Merge broadcaster and pipeline

[dannylamb]

GitHub Issue: Resolves Islandora/documentation#569

What does this Pull Request do?

Merges the broadcaster and pipeline code to be a single route, where behavior is controlled via a header that gets converted to an ExchangePattern.

What's new?

We're using the routingSlip pattern for both now. Using an exchange pattern of InOnly causes the same message to get passed to each recipient. Processing occurs in parallel. Using the exchange pattern of InOut causes the output of each recipient to get passed to the next, with processing occuring in sequence. In other words, InOut causes each step to 'block', allowing us to control the sequence of steps in a workflow.

If no header is provided for the exchange pattern, the default behaviour is to use InOnly.

How should this be tested?

• Pull these changes into Alpaca
• ./gradlew install
• /opt/karaf/bin/client
• bundle:list | grep islandora to get the number of the islandora-connector-broadcast bundle
• bundle:update THAT_NUMBER

Everything should continue to work as expected. That is, go do some CRUD on an entity and the changes should be reflected in the triplestore.

Additional Notes:

Thanks to @Natkeeran for posing the right questions when working through an earlier issue, as that's what prompted this improvement.

Interested parties

@Islandora-CLAW/committers

[codecov]

Codecov Report

Merging #38 into master will increase coverage by 1.18%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master      #38      +/-   ##
============================================
+ Coverage        70%   71.18%   +1.18%     
  Complexity        3        3              
============================================
  Files             3        2       -1     
  Lines            60       59       -1     
============================================
  Hits             42       42              
+ Misses           18       17       -1

Impacted Files	Coverage Δ	Complexity Δ
...ra/alpaca/connector/broadcast/BroadcastRouter.java	0% <0%> (ø)	0 <0> (ø)	⬇️

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[ruebot]

Tested, and looks good.