As we moved most of the creation of a BufferPool to be via the
Streaming::pool() method, which uses a thread-local, it makes sense
to start cleaning up the design and make it more modern C++.
The above mentioned method would return a reference and you'd see
loads of places use `auto &pool =` which is less than ideal.
As the number of places where we actually instantiate a BufferPool
goes down, the usage of some sort of smart pointer makes more sense.
This now makes all APIs use BufferPool be wrapped in a shared_ptr.
The core APIs in Flowee are quite low-level and especially combining
results from multiple services becomes tedius, verbose and thus
error-prone.
For this reason I wrote a new SearchEngine and related classes which
allow one to create a single compound request, submit it to the engine and
get a callback when it is done.
For instance one can now create a request for a transaction by txid and the
system will split this into a txid-lookup and the actual fetch for the
transaction.
Enough callbacks and options exist to be able to add a lot more details
this way in a simple manner.
tomFlowee
TomZ