Class AsyncProfiler

src/api/one/profiler/AsyncProfiler.java:19–299

Java API for in-process profiling. Serves as a wrapper around async-profiler native library. This class is a singleton. The first call to #getInstance() initiates loading of libasyncProfiler.so.

 * libasyncProfiler.so.
 */
public class AsyncProfiler implements AsyncProfilerMXBean {
    private static AsyncProfiler instance;

    private AsyncProfiler() {
    }

    public static AsyncProfiler getInstance() {
        return getInstance(null);
    }

    public static synchronized AsyncProfiler getInstance(String libPath) {
        if (instance != null) {
            return instance;
        }

        AsyncProfiler profiler = new AsyncProfiler();
        if (libPath != null) {
            System.load(libPath);
        } else {
            try {
                // No need to load library, if it has been preloaded with -agentpath
                profiler.getVersion();
            } catch (UnsatisfiedLinkError e) {
                String libraryPath = System.getProperty("one.profiler.libraryPath");
                if (libraryPath != null && !libraryPath.isEmpty()) {
                    System.load(new File(libraryPath).getAbsolutePath());
                } else {
                    File file = extractEmbeddedLib();
                    if (file != null) {
                        try {
                            System.load(file.getAbsolutePath());
                        } finally {
                            file.delete();
                        }
                    } else {
                        System.loadLibrary("asyncProfiler");
                    }
                }

            }
        }

        instance = profiler;
        return profiler;
    }

    private static File extractEmbeddedLib() {
        String resourceName = "/" + getPlatformTag() + "/libasyncProfiler.so";
        InputStream in = AsyncProfiler.class.getResourceAsStream(resourceName);
        if (in == null) {
            return null;
        }

        try {
            String extractPath = System.getProperty("one.profiler.extractPath");
            File file = File.createTempFile("libasyncProfiler-", ".so",
                    extractPath == null || extractPath.isEmpty() ? null : new File(extractPath));
            try (FileOutputStream out = new FileOutputStream(file)) {