core/org.openjdk.jmc.flightrecorder/src/main/java/org/openjdk/jmc/flightrecorder/jdk/JdkAttributes.java

*** 47,56 ****
--- 47,57 ----
  import static org.openjdk.jmc.common.unit.UnitLookup.THREAD;
  import static org.openjdk.jmc.common.unit.UnitLookup.TIMESPAN;
  import static org.openjdk.jmc.common.unit.UnitLookup.TIMESTAMP;
  import static org.openjdk.jmc.common.unit.UnitLookup.UNKNOWN;
  
+ import java.util.ArrayList;
  import java.util.List;
  
  import org.openjdk.jmc.common.IDisplayable;
  import org.openjdk.jmc.common.IMCClassLoader;
  import org.openjdk.jmc.common.IMCFrame;
*** 71,80 ****
--- 72,82 ----
  import org.openjdk.jmc.common.unit.IQuantity;
  import org.openjdk.jmc.common.unit.UnitLookup;
  import org.openjdk.jmc.common.util.FormatToolkit;
  import org.openjdk.jmc.common.util.LabeledIdentifier;
  import org.openjdk.jmc.common.util.MCClassLoader;
+ import org.openjdk.jmc.common.util.MemberAccessorToolkit;
  import org.openjdk.jmc.flightrecorder.JfrAttributes;
  import org.openjdk.jmc.flightrecorder.jdk.messages.internal.Messages;
  
  /**
   * Various attributes based on JDK flight recorder data.
*** 468,477 ****
--- 470,499 ----
                          Messages.getString(Messages.ATTR_IO_SOCKET_READ_EOS),
                          Messages.getString(Messages.ATTR_IO_SOCKET_READ_EOS_DESC), FLAG);
          public static final IAttribute<IQuantity> IO_SOCKET_BYTES_WRITTEN = attr("bytesWritten", //$NON-NLS-1$
                          Messages.getString(Messages.ATTR_IO_SOCKET_BYTES_WRITTEN),
                          Messages.getString(Messages.ATTR_IO_SOCKET_BYTES_WRITTEN_DESC), MEMORY);
+         
+         public static final IAttribute<IQuantity> IO_SIZE = Attribute.canonicalize(new Attribute<IQuantity>("size",  //#NON-NLS-1$
+                         "Size", null, MEMORY) {
+                 @Override
+                 public <U> IMemberAccessor<IQuantity, U> customAccessor(IType<U> type){
+                         List<IMemberAccessor<IQuantity, U>> accessorList = new ArrayList<>();
+                         
+                         accessorList.add(type.getAccessor(JdkAttributes.IO_SOCKET_BYTES_READ.getKey()));
+                         accessorList.add(type.getAccessor(JdkAttributes.IO_SOCKET_BYTES_WRITTEN.getKey()));
+                         accessorList.add(type.getAccessor(JdkAttributes.IO_FILE_BYTES_READ.getKey()));
+                         accessorList.add(type.getAccessor(JdkAttributes.IO_FILE_BYTES_WRITTEN.getKey()));
+ 
+                         for (IMemberAccessor<IQuantity, U> accessor : accessorList) {
+                                 if(accessor != null) {
+                                         return accessor;
+                                 }
+                         }
+                         return MemberAccessorToolkit.constant(UnitLookup.BYTE.quantity(0));
+                 }
+         });
          public static final IAttribute<String> IO_ADDRESS = attr("address", Messages.getString(Messages.ATTR_IO_ADDRESS), //$NON-NLS-1$
                          PLAIN_TEXT);
          public static final IAttribute<String> IO_HOST = attr("host", Messages.getString(Messages.ATTR_IO_HOST), //$NON-NLS-1$
                          Messages.getString(Messages.ATTR_IO_HOST_DESC), PLAIN_TEXT);
          public static final IAttribute<IQuantity> IO_PORT = attr("port", Messages.getString(Messages.ATTR_IO_PORT), NUMBER); //$NON-NLS-1$