Yoshi Yamaguchi 9ed97980e2 Add Stackdriver Trace exporter for trace. (#160) ... * Add Stackdriver Trace exporter for trace. TODOs for future work is: * to replace bundler.Bundler * to add proper tests for the exporter * to move the exporter to proper repository once it will be created. * Change to use functions for the exporter initialization instead of passing option struct directly. This fix is aliging the same fix for Jaeger (#146, #161) * Change Option struct to be function type * Change the original Option struct to be private * Add line comments to maxMessageEventsPerSpan to leave it for future implementation * Fix unnessesary expressions specified by `make precommit` Left errors by `make precommit` in experimental/bridge/opentracing. * Ran make precommit * Add new line at EOF * WIP: Start implementing BatchSpanExporter interfaces * Change to use RegisterSpanProcessor to register bsp * Change function names to fit current implementation of sdk * Removed google.golang.org/api/support/bundler and implement ssp and bsp * Change spanProcessor as a member of Exporter. * Fix option names used for BatchSpanProcessor initialization. * Change Exporter.Shutdown just to unregister spanProcessor. * Removed copyright statements of OpenCensus. * Fix small typo and EOF new line * Fix interfaces of ExportSpan/ExportSpans to meet SpanSyncer/SpanBatcher * Change to follow context.Context passed in ExportSpan/ExportSpans * Fix Stackdriver Exporter to hold sync.Once to lock when it is registered and unregistered.		2019-10-08 23:33:19 -07:00
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trace	Add Stackdriver Trace exporter for trace. (#160)	2019-10-08 23:33:19 -07:00