(New) Synchronous Pull with Lease Management

[anguillanneuf]

This new code sample for synchronous pull with lease management aims to keep the Pub/Sub logic and the application logic separate, by

1). creating the long running process outside in a worker function, and using setTimeout to simulate this process of unknown length;
2). making use of setInterval instead of a for loop.

Here is what the stdout would look like:

Processing "hello me" for 60.227s...
Processing "hello him" for 95.585s...
Reset ack deadline for "hello me" for 30s.
Reset ack deadline for "hello him" for 30s.
Reset ack deadline for "hello me" for 30s.
Reset ack deadline for "hello him" for 30s.
Reset ack deadline for "hello me" for 30s.
Reset ack deadline for "hello him" for 30s.
Reset ack deadline for "hello me" for 30s.
Reset ack deadline for "hello him" for 30s.
Reset ack deadline for "hello me" for 30s.
Reset ack deadline for "hello him" for 30s.
Reset ack deadline for "hello me" for 30s.
Reset ack deadline for "hello him" for 30s.
Finished procesing "hello me".
Acknowledged: "hello me".
Reset ack deadline for "hello him" for 30s.
Reset ack deadline for "hello him" for 30s.
Reset ack deadline for "hello him" for 30s.
Finished procesing "hello him".
Acknowledged: "hello him".
Done.

[codecov]

Codecov Report

Merging #272 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #272   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          10     10           
  Lines         807    807           
=====================================
  Hits          807    807

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