* Add a converter for CurrencyUnits stored in the database
This uses the well-known String representation for currency units. It also
provides a base class for other converters that will be persisting the
toString() representation.
* Add DB and formatting changes
* Add tests, make minor fixes
* Instrument proxy frontend latency metric
Backend latency only captures the time spent waiting for the GAE backend
to respond to a request, which is not representitive of what clients
experience. For instance it does not take into account the time the
proxy spends on processing the requests and the time it takes to send a
response to the client.
This PR adds a metric for frontend latency, which is the time spent on
answering a client request. This should serve as a better proxy for the
latency clients observe.
* Rename AbstractMetrics to BaseMetrics
* Move test resource files into src/test/resources
* fix a test
* Remove references to javatests/ in Java files
* fix import order
* fix semantic merge conflict
Fix or suppress deprecation warnings except those about GoogleCredential,
which is being handled separately.
The @SuppressWarnings("deprecation") annotation does not cover imports
even when it is at the class level. We removed imports of deprecated
classes and use their fully qualified names in class body.
