without this change when user adds a callback then it's not wrapped in a trace representation, thus when executed in a separate thread, it's then missing all the tracing information
with this change we're wrapping the future in our representation that passes the tracing information around
fixes#546
Fix#556
* Explicitly state that `StreamSleuthAutoConfiguration` should
execute before `TraceAutoConfiguration`;
* Also ensure that `ChannelsEndpointAutoConfiguration` is configured
after `StreamSleuthAutoConfiguration` to ensure that the bound
channels are added to the `/channels` actuator endpoint
The main arguments for these features are
* api-agnostic means to collaborate with a span
- use of annotations allows users to add to a span with no library dependency on a span api.
This allows Sleuth to change its core api less impact to user code.
* reduced surface area for basic span operations.
- without this feature one has to use the span api, which has lifecycle commands that
could be used incorrectly. By only exposing scope, tag and log functionality, users can
collaborate without accidentally breaking span lifecycle.
* collaboration with runtime generated code
- with libraries such as Spring Data / Feign the implementations of interfaces are generated
at runtime thus span wrapping of objects was tedious. Now you can provide annotations
over interfaces and arguments of those interfaces
This PR is an adoption of @Koizumi85 work started here - https://github.com/Koizumi85/spring-cloud-sleuth-annotationfixes#182
without this change we get exceptions related to not being able to extend a final class
with this change we're not wrapping any final types and we have a custom bean post processor for okhttp
fixes#513
without this change we're explicitly requiring our users to take both web and actuator into their classpath. That makes little sense since not every app is a web app.
with this change we're making those deps optional
fixes#524
without this change when someone has a missing ErrorController bean then TraceHandlerInterceptor blows up
with this change that problem gets fixed
fixes#512
without this change there's a problem with the time when the SS is set on a span. Currently it's done in TraceFilter's finally block. The problem is that this code is executed after the response has been sent back to the client. Thus CR sometimes was set faster than SS (it doesn't make any sense from the logical point of view).
with this change we're introducing wrappers over the HttpServletResponse where we annotate the span with SS just after the response gets sent to the recipient.
fixes#492#431
without this change you couldn't register your own client (for example to set your ssl config) for Sleuth to reuse it
with this change we're reusing a registered feign client bean or creating a default one if necessary
fixes#502
