src/java.management/share/classes/sun/management/ManagementFactoryHelper.java

rev 58228 : 8238665: Add JFR event for direct memory statistics

*** 37,48 ****
  import javax.management.RuntimeOperationsException;
  import java.security.AccessController;
  import java.security.PrivilegedActionException;
  import java.security.PrivilegedExceptionAction;
  
- import jdk.internal.access.JavaNioAccess;
  import jdk.internal.access.SharedSecrets;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import java.lang.reflect.UndeclaredThrowableException;
--- 37,49 ----
  import javax.management.RuntimeOperationsException;
  import java.security.AccessController;
  import java.security.PrivilegedActionException;
  import java.security.PrivilegedExceptionAction;
  
  import jdk.internal.access.SharedSecrets;
+ import jdk.internal.misc.VM;
+ import jdk.internal.misc.VM.BufferPool;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import java.lang.reflect.UndeclaredThrowableException;
*** 50,59 ****
--- 51,61 ----
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Optional;
+ import java.util.stream.Collectors;
  
  /**
   * ManagementFactoryHelper provides static factory methods to create
   * instances of the management interface.
   */
*** 335,365 ****
           }
  
          static final PlatformLoggingMXBean MBEAN = getInstance();
      }
  
!     private static List<BufferPoolMXBean> bufferPools = null;
!     public static synchronized List<BufferPoolMXBean> getBufferPoolMXBeans() {
          if (bufferPools == null) {
!             bufferPools = new ArrayList<>(2);
!             bufferPools.add(createBufferPoolMXBean(SharedSecrets.getJavaNioAccess()
!                 .getDirectBufferPool()));
!             bufferPools.add(createBufferPoolMXBean(sun.nio.ch.FileChannelImpl
!                 .getMappedBufferPool()));
!             bufferPools.add(createBufferPoolMXBean(sun.nio.ch.FileChannelImpl
!                 .getSyncMappedBufferPool()));
          }
          return bufferPools;
      }
  
      private final static String BUFFER_POOL_MXBEAN_NAME = "java.nio:type=BufferPool";
  
      /**
       * Creates management interface for the given buffer pool.
       */
      private static BufferPoolMXBean
!         createBufferPoolMXBean(final JavaNioAccess.BufferPool pool)
      {
          return new BufferPoolMXBean() {
              private volatile ObjectName objname;  // created lazily
              @Override
              public ObjectName getObjectName() {
--- 337,367 ----
           }
  
          static final PlatformLoggingMXBean MBEAN = getInstance();
      }
  
!     private static volatile List<BufferPoolMXBean> bufferPools;
!     public static List<BufferPoolMXBean> getBufferPoolMXBeans() {
          if (bufferPools == null) {
!             synchronized (ManagementFactoryHelper.class) {
!                 if (bufferPools == null) {
!                     bufferPools = VM.getBufferPools().stream()
!                                     .map(ManagementFactoryHelper::createBufferPoolMXBean)
!                                     .collect(Collectors.toList());
!                 }
!             }
          }
          return bufferPools;
      }
  
      private final static String BUFFER_POOL_MXBEAN_NAME = "java.nio:type=BufferPool";
  
      /**
       * Creates management interface for the given buffer pool.
       */
      private static BufferPoolMXBean
!         createBufferPoolMXBean(final BufferPool pool)
      {
          return new BufferPoolMXBean() {
              private volatile ObjectName objname;  // created lazily
              @Override
              public ObjectName getObjectName() {