test/jdk/jdk/jfr/jvm/TestLogOutput.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 *
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package jdk.jfr.jvm;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

/*
 * @test TestLogOutput
 * @key jfr
 * @summary Sanity test jfr logging output
 * @library /test/lib
 * @run main/othervm -Xlog:disable -Xlog:jfr*=trace:file=jfr_trace.txt -XX:StartFlightRecording=duration=1s,filename=recording.jfr jdk.jfr.jvm.TestLogOutput
 */
public class TestLogOutput {
    public static void main(String[] args) throws Exception {
        final String fileName = "jfr_trace.txt";
        final List<String>findWhat = new ArrayList<>();
        findWhat.add("Starting up Jfr startup recording");
        findWhat.add("Flight Recorder initialized");
        boolean passed = false;
        List<String> matches = new ArrayList<String>(findWhat);

        do {
            List<String> lines;
            try {
                lines = Files.readAllLines(Paths.get(fileName));
            } catch (IOException e) {
                throw new Error(e);
            }
            for (String l : lines) {
                for (String m : matches) {
                    if (l.toString().contains(m)) {
                        matches.remove(m);
                        break;
                    }
                }
            }
            if (matches.size() < 1) {
                passed = true;
                break;
            }
            if (lines.size() > 100) {
                break; /* did not find it */
            }
        } while(!passed);

        if (!passed) {
            throw new Error("Not found " + findWhat  + " in stream");
        }

       System.out.println("PASSED");
    }
}