Some assumptions were being made in tests, e.g. about
there being an AuthenticationManager @Bean, which were
false with the new Security 3.2.1 updates from Rob.
Also parent-child contexts with the actuator were
problematic because they didn't exclude the web configuration
for the management security in the parent context.
Fixes gh-244
Also change strategy for defaulting of Authentication. Spring
Boot authentication defaults are now encapsulated and can easily
be overridden by a user defined AuthenticationManager.
The default executor for publishing metrics was a single
thread (native JDK) ExecutorService with a non-daemon thread.
Changed it to a Spring-managed thread pool of size 1, which
is then shutdown with e ApplicationContext automatically.
Fixes gh-388
Update `EndpointWebMvcAutoConfiguration` to use '-1' to indicate that
the management context should be disabled. This brings consistency
between the server settings and the management settings and allows '0'
to be used to pick a random port.
Fixed gh-311
Spring Boot provides a default AuthenticatiomManager for getting
started quickly with security and never exposing insecure
endpoints. To override that feature as users move to the next
stage in their project, they may have to do something slightly
different depending on whether it is a webapp or not.
In any app (web or not), providing a @Bean of type
AuthenticationManager always works, but you don't get the benefit of
the builder features.
In a webapp the user can also extend WebSecurityConfigurerAdapter
to provides a custom AuthenticationManager, and the preferred
way of doing that is via a void method that is autowired with an
AuthenticationManagerBuilder. The default AuthenticationManager is
built in a configurer with @Order(LOWEST_PRECEDENCE - 3) so
to override it the user's confugrer must have higher precedence
(lower @Order).
@EnableGlobalMethodSecurity can also be used in a non-webapp, and
Spring Boot will still provide a default AuthenticationManager.
To override it the user has to either extend
GlobalMethodSecurityConfiguration or provide a @Bean of type
AuthenticationManager (there's no other way to
capture the AuthenticationManagerBuilder that doesn't happen too late
in the beans lifecyle).
Fixes gh-244
If the context hierarchy is from a SpringApplication we can control
the shutdown semantics a bit. Specifically we need a listener in the child context
that will shut it down when the parent closes (since assummably the child relies
on beans in the arent that may now be disposed).
Fixes gh-275
Instead of adding active prpfiles for every one we encounter, we need to
build up a complete "default" Environment and then ask it what the active
profiles are. Implemented in ConfigFileApplicationListener.
Fixes gh-198
Main user-facing interface is still Counter/GaugeService but the
back end behind that has more options. The Default*Services write
metrics to a MetricWriter and there are some variants of that, and
also variants of MetricReader (basic read-only actions).
MetricRepository is now a combination of MetricReader, MetricWriter
and some more methods that make it a bit more repository like.
There is also a MultiMetricReader and a MultiMetricRepository for
the common case where metrics are stored in related (often open
ended) groups. Examples would be complex metrics like histograms
and "rich" metrics with averages and statistics attached (which
are both closed) and "field counters" which count the occurrences
of values of a particular named field or slot in an incoming message
(e.g. counting Twitter hastags, open ended).
In memory and redis implementations are provided for the repositories.
Generally speaking the in memory repository should be used as a
local buffer and then scheduled "exports" can be executed to copy
metric values accross to a remote repository for aggregation.
There is an Exporter interface to support this and a few implementations
dealing with different strategies for storing the results (singly or
grouped).
Codahale metrics are also supported through the MetricWriter interface.
Currently implemented through a naming convention (since Codahale has
a fixed object model this makes sense): metrics beginning with "histogram"
are Histograms, "timer" for Timers, "meter" for Meters etc.
Support for message driven metric consumption and production are provided
through a MetricWriterMessageHandler and a MessageChannelMetricWriter.
No support yet for pagination in the repositories, or for HATEOAS style
HTTP endpoints.
We get more control over the handling and in particular the registration
of the endpoint this way. It was practically impossible to disable the
AgentServlet bean when in a parent context of the management server
because of lifecyce issues - you don't know that the user wants a
separate management server until too late.
This approach also makes it possible to test with spring-test MVC
support.
