spring-boot

Spring Boot

Andy Wilkinson 60ac2e5c09 Reduce the amount of garbage produced by JarFile 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		8 years ago
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it	Update copyright year for changed files	9 years ago
main/java/org/springframework/boot/loader	Reduce the amount of garbage produced by JarFile	8 years ago
test	Reduce the amount of garbage produced by JarFile	8 years ago