> I mainly made these optimizations: > > * Avoid allocating `StringBuilder` when there are no characters in the URL > that need to be encoded; > * Implement a fast path for UTF-8. > > In addition to improving performance, these optimizations also reduce > temporary objects: > > * It no longer allocates any object when there are no characters in the URL > that need to be encoded; > * The initial size of StringBuilder is larger to avoid expansion as much as > possible; > * For UTF-8, the temporary `CharArrayWriter`, strings and byte arrays are no > longer needed. > > The results of the `URLEncodeDecode` benchmark: > > > Before: > Benchmark (count) (maxLength) (mySeed) Mode Cnt > Score Error Units > URLEncodeDecode.testEncodeUTF8 1024 1024 3 avgt 15 > 5.587 ? 0.010 ms/op > > After: > Benchmark (count) (maxLength) (mySeed) Mode Cnt > Score Error Units > URLEncodeDecode.testEncodeUTF8 1024 1024 3 avgt 15 > 3.582 ? 0.054 ms/op > > > I also updated the tests to add more test cases.
Glavo has updated the pull request incrementally with one additional commit since the last revision: UTF8EncodeUtils ------------- Changes: - all: https://git.openjdk.org/jdk/pull/15354/files - new: https://git.openjdk.org/jdk/pull/15354/files/6eea3ea8..03b11276 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=15354&range=01 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15354&range=00-01 Stats: 121 lines in 2 files changed: 109 ins; 0 del; 12 mod Patch: https://git.openjdk.org/jdk/pull/15354.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/15354/head:pull/15354 PR: https://git.openjdk.org/jdk/pull/15354
