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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
}
}
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