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8361640: JFR: RandomAccessFile::readLine emits events for each character

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Reviewed-by: rriggs, alanb, mgronlun
This commit is contained in:
Erik Gahlin 2025-07-15 20:33:24 +00:00
parent 6fc032de2c
commit 9bef2d1610
1 changed files with 17 additions and 2 deletions
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19
src/java.base/share/classes/java/io/RandomAccessFile.java
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@ -1030,17 +1030,32 @@ public class RandomAccessFile implements DataOutput, DataInput, Closeable {
*/
public final String readLine() throws IOException {
if (jfrTracing && FileReadEvent.enabled()) {
long bytesRead = 0;
long start = FileReadEvent.timestamp();
try {
String result = implReadLine();
bytesRead = result == null ? 0 : result.length();
return result;
} finally {
FileReadEvent.offer(start, path, bytesRead);
}
}
return implReadLine();
}
private final String implReadLine() throws IOException {
StringBuilder input = new StringBuilder();
int c = -1;
boolean eol = false;
while (!eol) {
switch (c = read()) {
switch (c = read0()) {
case -1, '\n' -> eol = true;
case '\r' -> {
eol = true;
long cur = getFilePointer();
if ((read()) != '\n') {
if ((read0()) != '\n') {
seek(cur);
}
}