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diff --git a/samples/interfaces/mapping/src/main/java/io/fd/honeycomb/samples/interfaces/mapping/oper/InterfaceReaderCustomizer.java b/samples/interfaces/mapping/src/main/java/io/fd/honeycomb/samples/interfaces/mapping/oper/InterfaceReaderCustomizer.java
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+++ b/samples/interfaces/mapping/src/main/java/io/fd/honeycomb/samples/interfaces/mapping/oper/InterfaceReaderCustomizer.java
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+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.fd.honeycomb.samples.interfaces.mapping.oper;
+
+import io.fd.honeycomb.samples.interfaces.mapping.LowerLayerAccess;
+import io.fd.honeycomb.translate.read.ReadContext;
+import io.fd.honeycomb.translate.read.ReadFailedException;
+import io.fd.honeycomb.translate.spi.read.ListReaderCustomizer;
+import java.util.List;
+import java.util.stream.Collectors;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.io.fd.honeycomb.samples.interfaces.rev160810.InterfaceId;
+import org.opendaylight.yang.gen.v1.io.fd.honeycomb.samples.interfaces.rev160810.InterfacesStateBuilder;
+import org.opendaylight.yang.gen.v1.io.fd.honeycomb.samples.interfaces.rev160810.interfaces.state.Interface;
+import org.opendaylight.yang.gen.v1.io.fd.honeycomb.samples.interfaces.rev160810.interfaces.state.InterfaceBuilder;
+import org.opendaylight.yang.gen.v1.io.fd.honeycomb.samples.interfaces.rev160810.interfaces.state.InterfaceKey;
+import org.opendaylight.yangtools.concepts.Builder;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * This is a customizer responsible for reading Interface operational data
+ */
+public class InterfaceReaderCustomizer implements ListReaderCustomizer<Interface, InterfaceKey, InterfaceBuilder> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(InterfaceReaderCustomizer.class);
+    private final LowerLayerAccess access;
+
+    public InterfaceReaderCustomizer(final LowerLayerAccess access) {
+        this.access = access;
+    }
+
+    @Nonnull
+    @Override
+    public List<InterfaceKey> getAllIds(@Nonnull final InstanceIdentifier<Interface> id,
+                                        @Nonnull final ReadContext context) throws ReadFailedException {
+        // context can be used to access cache (lifetime during a transaction) to store any information for
+        // subsequent invocations or for other customizers
+        // context.getModificationCache();
+
+        // context can also be used to access context data. Context data are stored in a persistent data store
+        // and usually are additional data required to perform the translation in customizers e.g. if underlying layer
+        // does not recognize interface-ids as string names, but only indices, the mapping between them can should
+        // be stored in the context data store
+        // Note: The context datastore is also YANG drive, so context data must be modeled in YANG prior to using them
+        // context.getMappingContext();
+
+        // return some sample IDs
+        return access.getAllInterfaceNames().stream()
+                .map(InterfaceId::new)
+                .map(InterfaceKey::new)
+                .collect(Collectors.toList());
+    }
+
+    @Override
+    public void merge(@Nonnull final Builder<? extends DataObject> builder, @Nonnull final List<Interface> readData) {
+        // Just set the result of this customizers read into parent builder
+        // Builder has to be cast properly
+        ((InterfacesStateBuilder) builder).setInterface(readData);
+    }
+
+    @Nonnull
+    @Override
+    public InterfaceBuilder getBuilder(@Nonnull final InstanceIdentifier<Interface> id) {
+        // Just providing empty builder
+        return new InterfaceBuilder();
+    }
+
+    @Override
+    public void readCurrentAttributes(@Nonnull final InstanceIdentifier<Interface> id,
+                                      @Nonnull final InterfaceBuilder builder, @Nonnull final ReadContext ctx)
+            throws ReadFailedException {
+        // This is where the actual "read" is happening, read attributes for a specific interface
+        final InterfaceKey k = id.firstKeyOf(Interface.class);
+        final String ifcId = k.getInterfaceId().getValue();
+        LOG.info("Reading data for interface: {} at {}", ifcId, id);
+
+        // Fill in some random values, this is actually the place where communication with lower layer
+        // would occur to get the real values
+        builder.setMtu(access.getMtuForInterface(ifcId));
+        builder.setInterfaceId(k.getInterfaceId());
+        // Counters container is not set here, instead a dedicated customizer is created for it
+        // It could be set here, if this customizer + its reader were marked as subtree reader in the ReaderFactory
+        // However its a good practice to provide a dedicated reader+customizer for every complex node
+    }
+
+}