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⚡ Bolt: String.format을 HexFormat으로 대체하여 변환 성능 최적화 #16

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seonghobae wants to merge 6 commits into from
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⚡ Bolt: String.format을 HexFormat으로 대체하여 변환 성능 최적화 #16

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95cacba
⚡ Bolt: `String.format` 병목을 `HexFormat`으로 최적화하여 바이트-16진수 변환 성능 향상
seonghobae Jun 23, 2026
65fa45e
Cover content hash hex output
seonghobae Jun 28, 2026
1e35e8f
Merge remote-tracking branch 'origin/main' into bolt/hexformat-optimi…
seonghobae Jun 28, 2026
8cace90
Align PR metadata with main
seonghobae Jun 28, 2026
32f49c7
fix: ensure all CI checks pass with 100% test coverage and doc coverage
seonghobae Jun 28, 2026
60b6495
Remove stale governance files
seonghobae Jun 28, 2026
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9 changes: 3 additions & 6 deletions src/main/java/com/clearfolio/viewer/service/DefaultDocumentConversionService.java
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HexFormat;

import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
Expand Down Expand Up @@ -121,12 +122,8 @@ private String contentHash(MultipartFile file) {
}

byte[] raw = digest.digest();
StringBuilder hex = new StringBuilder(raw.length * 2);
for (byte b : raw) {
hex.append(String.format("%02x", b));
}

return hex.toString();
// ⚡ Bolt optimization: HexFormat is allocation-efficient and faster than String.format in a loop
return HexFormat.of().formatHex(raw);
} catch (NoSuchAlgorithmException ex) {
throw new IllegalStateException("SHA-256 digest unavailable", ex);
} catch (IOException ex) {
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