diff options
Diffstat (limited to 'v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/read/util/DelegatingReaderRegistry.java')
-rw-r--r-- | v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/read/util/DelegatingReaderRegistry.java | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/read/util/DelegatingReaderRegistry.java b/v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/read/util/DelegatingReaderRegistry.java new file mode 100644 index 000000000..5217024e8 --- /dev/null +++ b/v3po/vpp-facade-utils/src/main/java/io/fd/honeycomb/v3po/vpp/facade/impl/read/util/DelegatingReaderRegistry.java @@ -0,0 +1,113 @@ +/* + * 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.v3po.vpp.facade.impl.read.util; + +import static com.google.common.base.Preconditions.checkNotNull; + +import com.google.common.base.Optional; +import com.google.common.collect.Iterables; +import com.google.common.collect.LinkedListMultimap; +import com.google.common.collect.Multimap; +import io.fd.honeycomb.v3po.vpp.facade.impl.util.VppRWUtils; +import io.fd.honeycomb.v3po.vpp.facade.read.ListVppReader; +import io.fd.honeycomb.v3po.vpp.facade.read.ReadContext; +import io.fd.honeycomb.v3po.vpp.facade.read.ReadFailedException; +import io.fd.honeycomb.v3po.vpp.facade.read.ReaderRegistry; +import io.fd.honeycomb.v3po.vpp.facade.read.VppReader; +import java.util.Collections; +import java.util.List; +import java.util.Map; +import javax.annotation.Nonnull; +import org.opendaylight.yangtools.yang.binding.DataObject; +import org.opendaylight.yangtools.yang.binding.InstanceIdentifier; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * Simple reader registry able to perform and aggregated read (ROOT read) on top of all provided readers. Also able to + * delegate a specific read to one of the delegate readers. + * + * This could serve as a utility to hold & hide all available readers in upper layers. + */ +public final class DelegatingReaderRegistry implements ReaderRegistry { + + private static final Logger LOG = LoggerFactory.getLogger(DelegatingReaderRegistry.class); + + private final Map<Class<? extends DataObject>, VppReader<? extends DataObject>> rootReaders; + + /** + * Create new {@link DelegatingReaderRegistry} + * + * @param rootReaders List of delegate readers + */ + public DelegatingReaderRegistry(@Nonnull final List<VppReader<? extends DataObject>> rootReaders) { + this.rootReaders = VppRWUtils.uniqueLinkedIndex(checkNotNull(rootReaders), VppRWUtils.MANAGER_CLASS_FUNCTION); + } + + @Override + @Nonnull + public Multimap<InstanceIdentifier<? extends DataObject>, ? extends DataObject> readAll( + @Nonnull final ReadContext ctx) throws ReadFailedException { + + LOG.debug("Reading from all delegates: {}", this); + LOG.trace("Reading from all delegates: {}", rootReaders.values()); + + final Multimap<InstanceIdentifier<? extends DataObject>, DataObject> objects = LinkedListMultimap.create(); + for (VppReader<? extends DataObject> rootReader : rootReaders.values()) { + LOG.debug("Reading from delegate: {}", rootReader); + + if (rootReader instanceof ListVppReader) { + final List<? extends DataObject> listEntries = + ((ListVppReader) rootReader).readList(rootReader.getManagedDataObjectType(), ctx); + if (!listEntries.isEmpty()) { + objects.putAll(rootReader.getManagedDataObjectType(), listEntries); + } + } else { + final Optional<? extends DataObject> read = rootReader.read(rootReader.getManagedDataObjectType(), ctx); + if (read.isPresent()) { + objects.putAll(rootReader.getManagedDataObjectType(), Collections.singletonList(read.get())); + } + } + } + + return objects; + } + + @Nonnull + @Override + public Optional<? extends DataObject> read(@Nonnull final InstanceIdentifier<? extends DataObject> id, + @Nonnull final ReadContext ctx) + throws ReadFailedException { + final InstanceIdentifier.PathArgument first = checkNotNull( + Iterables.getFirst(id.getPathArguments(), null), "Empty id"); + final VppReader<? extends DataObject> vppReader = rootReaders.get(first.getType()); + checkNotNull(vppReader, + "Unable to read %s. Missing reader. Current readers for: %s", id, rootReaders.keySet()); + LOG.debug("Reading from delegate: {}", vppReader); + return vppReader.read(id, ctx); + } + + /** + * @throws UnsupportedOperationException This getter is not supported for reader registry since it does not manage a + * specific node type + */ + @Nonnull + @Override + public InstanceIdentifier<DataObject> getManagedDataObjectType() { + throw new UnsupportedOperationException("Root registry has no type"); + } +} |