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

@@ -47,10 +47,11 @@
 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;

@@ -71,10 +72,11 @@
 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.

@@ -468,10 +470,30 @@
                         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); //$NON-NLS-1$