Spring Boot's metrics infrastructure requires a Metric to have a
Number value. Coda Hale's ThreadStatesGaugeSet includes a Gauge
named deadlocks with a Set<String> value (each entry in the set is a
description, including stacktrace, of a deadlocked thread). There's
no obvious way to coerce this to a Number, and there's already a
deadlocks.count metric in the set.
This commit updates MetricRegistryMetricReader to ignore the addition
of any Gauge with a non-Number value.
Fixes gh-2593
We currently officially support Jackson 2.4, but some users wish to
use Jackson 2.5. This causes a failure as JacksonAutoConfiguration
depends on JacksonJodaFormat which exists in 2.4 but not in 2.5. This
commit updates JodaDataTimeJacksonConfiguration to make it conditional
on JacksonJodaFormat being on the classpath. This means that Jackson
2.5 users will not have configurable DateTime formatting
(added in 201fb5e5) but things will generally work once again.
Closes gh-2573
Using findAvailableTcpPort is prone to failure when another process
starts using the available port before Undertow starts. This commit
changes UndertowEmbeddedServletContainerFactory to pass the value of
zero down into Undertow where it will ultimately be passed to a
ServerSocket which will then use the underlying OS’s support for binding
to an available port.
Undertow doesn’t provide an API for getting the port(s) on which it’s
listening. Previously, reflection was being used to access the listener
configuration but, when a random port is used, this configuration would
return zero rather than the actual port. The reflective logic has been
updated to look at Undertow’s channels from which the underlying
ServerSocket can be accessed and the local port retrieved
Closes gh-2584
ee567fa boldy claimed that it had made MetricRegistryMetricReader
thread-safe. It had not. This commit should actually make it thread
safe. I hope.
One notable improvement is that MetricRegistryMetricReader.findAll()
will no longer contain null values if a metric is removed on another
thread during iteration.
names is now a ConcurrentHashMap to allow it to be safely read and
written without holding a lock.
reverse is a LinkedMultiValueMap which is not thread-safe. This could
lead to values being lost when concurrent add calls were made. Access
to reverse is now protected by synchronizing on an internal monitor
object.
Calls to containsKey(key) followed by get(key) have been reworked to
only call get(key), this avoids the possibility of the key being
removed after the contains check but before the get.
Closes gh-2590
Previously repackaging of an archive was performed in three steps:
1. Write the manifest
2. Write entries from the source archive into the destination
3. Write any libraries into the destination if they’re not already there
This worked fine for jar files, but not for war files. In the war file
case the libraries are already in the source archive’s WEB-INF/lib
directory so they’re copied into the destination in step 2. This means
that step 3 largely becomes a no-op and, crucially, the UNPACK comment
is not applied to any libraries that require it.
This commit reorders steps 2 and 3 so that the libraries are copied into
the destination first (allowing the UNPACK comment to be written, if
required) and then any entries in the source are written into the
destination if they’re not already there.
Fixes gh-2588
MetricRegistryMetricReader’s fields where neither final, nor volatile
but could be accessed on multiple threads. This lead to visibility
problems where the value of a field would unexpectedly be null, causing
an NPE.
This commit updates all of the fields to declare them as final, thereby
ensuring that their values are guaranteed to be visible across different
threads.
Fixes gh-2590
Previously, MongoProperties did not consider the configuration of a
custom authentication database when creating a MongoClient. This
commit updates MongoProperties to use the authentication database
when it is configured, falling back to the normal database when it is
not configured.
Closes gh-2562
