Java tutorial
/* * Copyright 2016-present Open Networking Laboratory * * 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 org.onosproject.net.resource; import com.esotericsoftware.kryo.Kryo; import com.esotericsoftware.kryo.Serializer; import com.esotericsoftware.kryo.io.Input; import com.esotericsoftware.kryo.io.Output; import com.google.common.annotations.Beta; import com.google.common.collect.DiscreteDomain; import com.google.common.collect.Range; import com.google.common.collect.TreeRangeSet; import org.onlab.util.ClosedOpenRange; import org.onlab.util.Tools; import java.util.ArrayList; import java.util.List; import java.util.Set; import java.util.stream.Collectors; import java.util.stream.IntStream; /** * Kryo serializer for {@link DiscreteResourceSet}. */ @Beta public final class DiscreteResourceSetSerializer extends Serializer<DiscreteResourceSet> { public DiscreteResourceSetSerializer() { super(false, true); } @Override public void write(Kryo kryo, Output output, DiscreteResourceSet object) { TreeRangeSet<Integer> rangeSet = TreeRangeSet.create(); object.values().stream().map(x -> x.valueAs(Object.class)).flatMap(Tools::stream) .map(x -> object.codec().encode(x)).map(Range::singleton) .map(x -> x.canonical(DiscreteDomain.integers())).forEach(rangeSet::add); List<ClosedOpenRange> ranges = rangeSet.asRanges().stream().map(ClosedOpenRange::of) .collect(Collectors.toList()); kryo.writeObject(output, ranges); kryo.writeClassAndObject(output, object.codec()); kryo.writeObject(output, object.parent()); } @Override public DiscreteResourceSet read(Kryo kryo, Input input, Class<DiscreteResourceSet> type) { @SuppressWarnings("unchecked") List<ClosedOpenRange> ranges = kryo.readObject(input, ArrayList.class); DiscreteResourceCodec codec = (DiscreteResourceCodec) kryo.readClassAndObject(input); DiscreteResourceId parent = kryo.readObject(input, DiscreteResourceId.class); if (ranges.isEmpty()) { return DiscreteResourceSet.empty(); } Set<DiscreteResource> resources = ranges.stream() .flatMapToInt(x -> IntStream.range(x.lowerBound(), x.upperBound())).mapToObj(x -> codec.decode(x)) .map(x -> Resources.discrete(parent, x).resource()).collect(Collectors.toSet()); return DiscreteResourceSet.of(resources, codec); } }