test/jdk/com/sun/jdi/ConnectedVMs.java

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/**
 * @test
 * @bug 4329140
 * @summary ConnectedVMs checks the method
 * VirtualMachineManager.connectedVirtualMachines()
 * @author Robert Field
 *
 * @library /test/lib
 * @run build TestScaffold VMConnection TargetListener TargetAdapter
 * @run compile -g InstTarg.java
 * @run driver ConnectedVMs Kill
 * @run driver ConnectedVMs Resume-to-exit
 * @run driver ConnectedVMs dispose()
 * @run driver ConnectedVMs exit()
 */
import com.sun.jdi.*;
import com.sun.jdi.event.*;
import com.sun.jdi.request.*;
import java.util.List;

import jdk.test.lib.Platform;

public class ConnectedVMs extends TestScaffold {
    static int failCount = 0;;
    static String passName;

    public static void main(String args[]) throws Exception {
        new ConnectedVMs(args[0]).startTests();
        if (failCount > 0) {
            throw new RuntimeException(
             "VirtualMachineManager.connectedVirtualMachines() " +
             failCount + " tests failed");
        } else {
            System.out.println(
          "VirtualMachineManager.connectedVirtualMachines() tests passed");
        }
    }

    ConnectedVMs(String name) throws Exception {
        super(new String[0]);
        passName = name;
        System.out.println("create " + passName);
    }

    @Override
    protected boolean allowedExitValue(int exitValue) {
        if (passName.equals("Kill")) {
            // 143 is SIGTERM, which we expect to get when doing a Process.destroy(),
            // unless we are on Windows, which will exit with a 1. However, sometimes
            // there is a race and the main thread exits before SIGTERM can force
            // an exit(143), so we need to allow exitValue 0 also.
            if (!Platform.isWindows()) {
                return exitValue == 143 || exitValue == 0;
            } else {
                return exitValue == 1 || exitValue == 0;
            }
        } else if (passName.equals("exit()")) {
            // This version of the test does an exit(1), so that's what we expect.
            // But similar to the SIGTERM race issue, the exit(1) might not happen
            // before the main thread exits, so we need to expect 0 also.
            return exitValue == 1 || exitValue == 0;
        }
        return super.allowedExitValue(exitValue);
    }

    void vms(int expected) {
        List vms = Bootstrap.virtualMachineManager().
            connectedVirtualMachines();
        if (vms.size() != expected) {
            System.out.println("FAILURE! " + passName +
                               " - expected: " + expected +
                               ", got: " + vms.size());
            ++failCount;
        }
    }

    protected void runTests() throws Exception {
        System.out.println("Testing " + passName);
        vms(0);
        BreakpointEvent bp = startToMain("InstTarg");
        waitForVMStart();
        StepEvent stepEvent = stepIntoLine(bp.thread());
        vms(1);

        // pick a way to die based on the input arg.
        if (passName.equals("Kill")) {
            vm().process().destroy();
        } else if (passName.equals("Resume-to-exit")) {
            vm().resume();
        } else if (passName.equals("dispose()")) {
            vm().dispose();
        } else if (passName.equals("exit()")) {
            vm().exit(1);
        } else {
            throw new Exception("Unknown pass name");
        }

        resumeToVMDisconnect();
        vms(0);
    }
}