Previously, working with a JarFile created a large amount of garbage
that was allocated on the thread local allocation buffer (TLAB).
The TLAB allocations made a significant contribution to GC pressure
and slowed down startup. This commit reduces the amount of garbage
by making a number of changes.
Reading from a RandomAccessDataFile has been reworked to avoid
creating new RandomAccessFile instances. A single RandomAccessFile
is now created for an entire jar file and it is used to read data from
anywhere in that jar file, including entries in nested jar files. To
ensure that reads remain thread-safe, a lock is taken on the
RandomAccessFile that is shared by all RandomAccessDataFile instances
that are provided access to (portions of) the same jar file.
Reading all of the bytes from a RandomAccessData has been reworked to
avoid the use of an InputStream that was created, used to read the
data, and then thrown away. In place of the InputStream-based
mechanism a method has been introduced that returns all of the
RandomAccessData as a byte[]. Building on this change, a method has
also been introduced to read a portion of a RandomAccessData as a
byte[]. This avoids the need to create a new RandomAccessData
subsection where the subsection was only used to read its entire
contents and then thrown away.
Decoding of an MS-DOS datetime has been reworked to use LocalDataTime
rather than GregorianCalendar. The former produces less garbage than
the latter.
Closes gh-12226
Update `PropertySourceLoader` so that it no longer needs to deal with
matching multi-document files using the `spring.profile` property. The
loader now simply returns one or more `PropertSource` instances for a
given `Resource`.
All property matching now occurs in the `ConfigFileApplicationListener`.
This allows document processing logic to be contained in a single place,
and allows us to rationalize the algorithm so that negative matching
profiles are processed last.
Fixes gh-12159
Update `ValidationBindHandler` so that validation only occurs when a
value is bound, or the bind depth is zero. This prevents validation from
triggering getters which may throw an exception.
Fixes gh-12227
This commit updates all `toLowerCase()` and `toUpperCase` invocations to
use the variant that takes a `Locale` to avoid locale-specific side
effect.
Closes gh-12213
This commit changes invocations to immediately return the expression
instead of assigning it to a temporary variable. The method name should
be sufficient for callers to know exactly what will be returned.
Closes gh-12211
Andy Wilkinson
Stephane Nicoll
Phillip Webb
Madhura Bhave
Kedar Joshi
dreis2211
Johnny Lim
Arnaud Heritier
igor-suhorukov