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/*
 * @test
 * @summary Test verifies that field access/modification events are correctly posted from JNI.
 * @bug 8224852
 * @run main/othervm/native -agentlib:FieldEventsFromJNI FieldEventsFromJNI
 */
public class FieldEventsFromJNI {

    private String accessField = "accessFieldValue";
    private String modifyField = "modifyFieldValue";

    private native void enableEventsAndAccessField(int numOfEventsExpected, Thread eventThread);
    private native void enableEventsAndModifyField(int numOfEventsExpected, Thread eventThread);

    void javaMethod(int numOfEventsExpected, Thread eventThread) {
        enableEventsAndAccessField(numOfEventsExpected, eventThread);
        enableEventsAndModifyField(numOfEventsExpected, eventThread);
    }

    final static Object lock = new Object();
    volatile static boolean isAnotherThreadStarted = false;

    public static void main(String[] args) throws InterruptedException {
        System.loadLibrary("FieldEventsFromJNI");
        // anotherThread doesn't access fields, it is needed only to
        // enable notification somewhere.
        Thread anotherThread = new Thread(() -> {
            isAnotherThreadStarted = true;
            synchronized(lock) {
                lock.notify();
            }
            while(!Thread.currentThread().isInterrupted()) {
                Thread.yield();
            }
        });
        synchronized(lock) {
            anotherThread.start();
            while (!isAnotherThreadStarted) {
                lock.wait();
            }
        }

        FieldEventsFromJNI testObject = new FieldEventsFromJNI();
        // Enable events while the thread is in the same JNI call.
        testObject.javaMethod(1, Thread.currentThread());
        // Verify that field access from JNI doesn't fail if events are
        // not enaled on this thread.
        testObject.javaMethod(0, anotherThread);
        anotherThread.interrupt();
        anotherThread.join();
    }
}