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8215237: jdk.jfr.Recording javadoc does not compile

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Reviewed-by: mgronlun
This commit is contained in:
Erik Gahlin 2018-12-13 15:40:11 +01:00
parent a85ad0aa18
commit ebdf83f88e
2 changed files with 21 additions and 34 deletions
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2
src/jdk.jfr/share/classes/jdk/jfr/Recording.java
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@ -54,7 +54,7 @@ import jdk.jfr.internal.WriteableUserPath;
* System.gc();
* Thread.sleep(5000);
* r.stop();
* r.copyTo(Files.createTempFile("my-recording", ".jfr"));
* r.dump(Files.createTempFile("my-recording", ".jfr"));
* </code>
* </pre>
*

53
src/jdk.jfr/share/classes/jdk/jfr/consumer/package-info.java
View File

@ -29,40 +29,27 @@
* In the following example, the program prints a histogram of all method samples in a recording.
* <pre>
* <code>
* public static void main(String[] args) {
* if (args.length != 0) {
* System.out.println("Must specify recording file.");
* return;
* public static void main(String[] args) throws IOException {
* if (args.length != 1) {
* System.err.println("Must specify a recording file.");
* return;
* }
* try (RecordingFile f = new RecordingFile(Paths.get(args[0]))) {
* Map{@literal <}String, SimpleEntry{@literal <}String, Integer{@literal >}{@literal >} histogram = new HashMap{@literal <}{@literal >}();
* int total = 0;
* while (f.hasMoreEvents()) {
* RecordedEvent event = f.readEvent();
* if (event.getEventType().getName().equals("jdk.ExecutionSample")) {
* RecordedStackTrace s = event.getStackTrace();
* if (s != null) {
* RecordedFrame topFrame= s.getFrames().get(0);
* if (topFrame.isJavaFrame()) {
* RecordedMethod method = topFrame.getMethod();
* String methodName = method.getType().getName() + "#" + method.getName() + " " + method.getDescriptor();
* Entry entry = histogram.computeIfAbsent(methodName, u -{@literal >} new SimpleEntry{@literal <}String, Integer{@literal >}(methodName, 0));
* entry.setValue(entry.getValue() + 1);
* total++;
* }
* }
* }
* }
* List{@literal <}SimpleEntry{@literal <}String, Integer{@literal >}{@literal >} entries = new ArrayList{@literal <}{@literal >}(histogram.values());
* entries.sort((u, v) -{@literal >} v.getValue().compareTo(u.getValue()));
* for (SimpleEntry{@literal <}String, Integer{@literal >} c : entries) {
* System.out.printf("%2.0f%% %s\n", 100 * (float) c.getValue() / total, c.getKey());
* }
* System.out.println("\nSample count: " + total);
* } catch (IOException ioe) {
* System.out.println("Error reading file " + args[0] + ". " + ioe.getMessage());
* }
* }
*
* RecordingFile.readAllEvents(Path.of(args[0])).stream()
* .filter(e -> e.getEventType().getName().equals("jdk.ExecutionSample"))
* .map(e -> e.getStackTrace())
* .filter(s -> s != null)
* .map(s -> s.getFrames().get(0))
* .filter(f -> f.isJavaFrame())
* .map(f -> f.getMethod())
* .collect(
* Collectors.groupingBy(m -> m.getType().getName() + "." + m.getName() + " " + m.getDescriptor(),
* Collectors.counting()))
* .entrySet()
* .stream()
* .sorted((a, b) -> b.getValue().compareTo(a.getValue()))
* .forEach(e -> System.out.printf("%8d %s\n", e.getValue(), e.getKey()));
* }
* </code>
* </pre>
* <p>