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How to use printFlag method of sun.tools.attach.HotSpotVirtualMachine class

Best Powermock code snippet using sun.tools.attach.HotSpotVirtualMachine.printFlag

Source:AttachSetGetFlag.java

...22 */23/*24 * @test25 * @bug 805482326 * @summary Tests the setFlag and printFlag attach command27 * @library /testlibrary28 * @modules java.base/sun.misc29 *          java.compiler30 *          java.management31 *          jdk.attach/sun.tools.attach32 *          jdk.jvmstat/sun.jvmstat.monitor33 * @build com.oracle.java.testlibrary.* AttachSetGetFlag34 * @run driver AttachSetGetFlag35 */36import java.io.BufferedReader;37import java.io.InputStreamReader;38import java.io.InputStream;39import java.lang.reflect.Field;40import java.nio.file.Files;41import java.nio.file.Path;42import java.nio.file.Paths;43import sun.tools.attach.HotSpotVirtualMachine;44import com.oracle.java.testlibrary.Asserts;45import com.oracle.java.testlibrary.Platform;46import com.oracle.java.testlibrary.ProcessTools;47import com.sun.tools.attach.VirtualMachine;48public class AttachSetGetFlag {49  public static void main(String... args) throws Exception {50    // Test a manageable uintx flag.51    testGetFlag("MaxHeapFreeRatio", "60");52    testSetFlag("MaxHeapFreeRatio", "50", "60");53    // Test a non-manageable size_t flag.54    // Since it is not manageable, we can't test the setFlag functionality.55    testGetFlag("ArrayAllocatorMallocLimit", "128");56    // testSetFlag("ArrayAllocatorMallocLimit", "64", "128");57  }58  public static ProcessBuilder runTarget(String flagName, String flagValue) throws Exception {59    return ProcessTools.createJavaProcessBuilder(60        "-XX:+UnlockExperimentalVMOptions",61        "-XX:" + flagName + "=" + flagValue,62        "AttachSetGetFlag$Target");63  }64  public static void testGetFlag(String flagName, String flagValue) throws Exception {65    ProcessBuilder pb = runTarget(flagName, flagValue);66    Process target = pb.start();67    try {68      waitForReady(target);69      int pid = (int)target.getPid();70      HotSpotVirtualMachine vm = (HotSpotVirtualMachine)VirtualMachine.attach(((Integer)pid).toString());71      // Test Get72      BufferedReader remoteDataReader = new BufferedReader(new InputStreamReader(73          vm.printFlag(flagName)));74      boolean foundExpectedLine = false;75      String line = null;76      while((line = remoteDataReader.readLine()) != null) {77        System.out.println("printFlag: " + line);78        if (line.equals("-XX:" + flagName + "=" + flagValue)) {79          foundExpectedLine = true;80        }81      }82      Asserts.assertTrue(foundExpectedLine, "Didn't get the expected output: '-XX:" + flagName + "=" + flagValue + "'");83      vm.detach();84    }85    finally {86      target.destroy();87      target.waitFor();88    }89  }90  public static void testSetFlag(String flagName, String initialFlagValue, String flagValue) throws Exception {91    ProcessBuilder pb = runTarget(flagName, initialFlagValue);92    Process target = pb.start();93    try {94      waitForReady(target);95      int pid = (int)target.getPid();96      HotSpotVirtualMachine vm = (HotSpotVirtualMachine)VirtualMachine.attach(((Integer)pid).toString());97      // First set the value.98      BufferedReader remoteDataReader = new BufferedReader(new InputStreamReader(99          vm.setFlag(flagName, flagValue)));100      String line;101      while((line = remoteDataReader.readLine()) != null) {102        System.out.println("setFlag: " + line);103        // Just empty the stream.104      }105      remoteDataReader.close();106      // Then read and make sure we get back the set value.107      remoteDataReader = new BufferedReader(new InputStreamReader(vm.printFlag(flagName)));108      boolean foundExpectedLine = false;109      line = null;110      while((line = remoteDataReader.readLine()) != null) {111        System.out.println("getFlag: " + line);112        if (line.equals("-XX:" + flagName + "=" + flagValue)) {113          foundExpectedLine = true;114        }115      }116      Asserts.assertTrue(foundExpectedLine, "Didn't get the expected output: '-XX:" + flagName + "=" + flagValue + "'");117      vm.detach();118    } finally {119      target.destroy();120      target.waitFor();121    }...

Source:AttachModelImpl.java

...79        }80        return null;81    }82    83    public synchronized String printFlag(String name) {84        try {85            InputStream in = getVirtualMachine().printFlag(name);86            return readToEOF(in);87        } catch (IOException ex) {88            LOGGER.log(Level.INFO,"printFlag",ex);  // NOI18N89        }90        return null;91    }92    93    public synchronized void setFlag(String name, String value) {94        try {95            InputStream in = getVirtualMachine().setFlag(name,value);96            String out = readToEOF(in);97            if (out.length()>0) {98                LOGGER.log(Level.INFO,"setFlag",out);   // NOI18N99            }100        } catch (IOException ex) {101            LOGGER.log(Level.INFO,"setFlag",ex);    // NOI18N102        }...

Source:CommandExecutor.java

...27                case "jcmd":28                    inputStream = hotSpotVirtualMachine.executeJCmd(command);29                    break;30                case "printflag":31//                    inputStream = hotSpotVirtualMachine.printFlag(cmd);32                    break;33                //jmap -histoææ34                case "inspectheap":35//                    inputStream = hotSpotVirtualMachine.heapHisto("-live");36                    break;37                //jstackææ38                case "threadDump":39                    inputStream = hotSpotVirtualMachine.remoteDataDump(new String[0]);40                    break;41                default:42                    break;43            }44            return inputStream == null ? "Command unsupported" : readVmOutput(inputStream);45        } catch (Exception e) {...

printFlag

Using AI Code Generation

1import sun.tools.attach.HotSpotVirtualMachine;2import com.sun.tools.attach.VirtualMachine;3import java.io.IOException;4import java.lang.management.ManagementFactory;5import java.lang.management.RuntimeMXBean;6import java.util.List;7import java.util.Properties;8public class 4 {9    public static void main(String[] args) throws Exception {10        String pid = getPID();11        HotSpotVirtualMachine vm = (HotSpotVirtualMachine) VirtualMachine.attach(pid);12        vm.printFlag("PrintGC");13        vm.detach();14    }15    private static String getPID() {16        RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean();17        String jvmName = runtimeMXBean.getName();18        int index = jvmName.indexOf("@");19        if (index < 1) {20            return null;21        }22        return jvmName.substring(0, index);23    }24}

printFlag

Using AI Code Generation

1import java.io.*;2import java.lang.reflect.*;3import sun.tools.attach.*;4public class 4 {5    public static void main(String[] args) throws Exception {6        HotSpotVirtualMachine vm = (HotSpotVirtualMachine) VirtualMachine.attach("1234");7        Class cl = Class.forName("sun.tools.attach.HotSpotVirtualMachine");8        Method m = cl.getDeclaredMethod("printFlag", String.class, PrintStream.class);9        m.setAccessible(true);10        m.invoke(vm, "PrintGCDetails", System.out);11    }12}13import java.io.*;14import java.lang.reflect.*;15import sun.tools.attach.*;16public class 5 {17    public static void main(String[] args) throws Exception {18        HotSpotVirtualMachine vm = (HotSpotVirtualMachine) VirtualMachine.attach("1234");19        Class cl = Class.forName("sun.tools.attach.HotSpotVirtualMachine");20        Method m = cl.getDeclaredMethod("printFlags", PrintStream.class);21        m.setAccessible(true);22        m.invoke(vm, System.out);23    }24}25import java.io.*;26import java.lang.reflect.*;27import sun.tools.attach.*;28public class 6 {29    public static void main(String[] args) throws Exception {30        HotSpotVirtualMachine vm = (HotSpotVirtualMachine) VirtualMachine.attach("1234");31        Class cl = Class.forName("sun.tools.attach.HotSpotVirtualMachine");32        Method m = cl.getDeclaredMethod("printStringFlag", String.class, PrintStream.class);33        m.setAccessible(true);34        m.invoke(vm, "PrintGCDetails", System.out);35    }36}37import java.io.*;38import java.lang.reflect.*;39import sun.tools.attach.*;40public class 7 {41    public static void main(String[] args) throws Exception {42        HotSpotVirtualMachine vm = (HotSpotVirtualMachine) VirtualMachine.attach("1234");43        Class cl = Class.forName("sun.tools.attach.HotSpotVirtualMachine");44        Method m = cl.getDeclaredMethod("printVmArgs", PrintStream.class);45        m.setAccessible(true);46        m.invoke(vm, System.out);47    }48}

printFlag

Using AI Code Generation

1import sun.tools.attach.HotSpotVirtualMachine;2import com.sun.tools.attach.VirtualMachine;3import com.sun.tools.attach.VirtualMachineDescriptor;4import java.io.IOException;5import java.util.List;6public class 4 {7public static void main(String[] args) throws IOException {8List<VirtualMachineDescriptor> vmds = VirtualMachine.list();9VirtualMachineDescriptor vmd = vmds.get(0);10VirtualMachine vm = VirtualMachine.attach(vmd);11HotSpotVirtualMachine hvm = (HotSpotVirtualMachine)vm;12String flagValue = hvm.printFlag("PrintGCDetails");13System.out.println(flagValue);14vm.detach();15}16}

printFlag

Using AI Code Generation

1import java.io.IOException;2import java.util.Properties;3import sun.tools.attach.HotSpotVirtualMachine;4public class 4 {5    public static void main(String[] args) throws IOException {6        HotSpotVirtualMachine vm = new HotSpotVirtualMachine("1234");7        Properties props = vm.getSystemProperties();8        vm.printFlag("PrintGCDetails");9        vm.detach();10    }11}12import java.io.IOException;13import java.util.Properties;14import sun.tools.attach.HotSpotVirtualMachine;15public class 5 {16    public static void main(String[] args) throws IOException {17        HotSpotVirtualMachine vm = new HotSpotVirtualMachine("1234");18        Properties props = vm.getSystemProperties();19        vm.printFlag("PrintGCDetails");20        vm.detach();21    }22}23import java.io.IOException;24import java.util.Properties;25import sun.tools.attach.HotSpotVirtualMachine;26public class 6 {27    public static void main(String[] args) throws IOException {28        HotSpotVirtualMachine vm = new HotSpotVirtualMachine("1234");29        Properties props = vm.getSystemProperties();30        vm.printFlag("PrintGCDetails");31        vm.detach();32    }33}34import java.io.IOException;35import java.util.Properties;36import sun.tools.attach.HotSpotVirtualMachine;37public class 7 {38    public static void main(String[] args) throws IOException {39        HotSpotVirtualMachine vm = new HotSpotVirtualMachine("1234");40        Properties props = vm.getSystemProperties();41        vm.printFlag("PrintGCDetails");42        vm.detach();43    }44}45import java.io.IOException;46import java.util.Properties;47import sun.tools.attach.HotSpot

printFlag

Using AI Code Generation

1import java.io.IOException;2import java.util.List;3import java.util.ArrayList;4import java.util.Arrays;5import com.sun.tools.attach.VirtualMachine;6import com.sun.tools.attach.VirtualMachineDescriptor;7import com.sun.tools.attach.AttachNotSupportedException;8import com.sun.tools.attach.spi.AttachProvider;9import sun.tools.attach.HotSpotVirtualMachine;10public class PrintFlag {11    public static void main(String[] args) throws IOException,12            IllegalArgumentException, InvocationTargetException {13        String flagName = args[0];14        List<VirtualMachineDescriptor> vmdList = VirtualMachine.list();15        for (VirtualMachineDescriptor vmd : vmdList) {16            String command = "jcmd " + vmd.id() + " VM.print_flag " + flagName;17            System.out.println(command);18            Process process = Runtime.getRuntime().exec(command);19            process.waitFor();20            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));21            String line = reader.readLine();22            System.out.println(line);23            reader.close();24            process.destroy();25        }26    }27}

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