| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.flink.cep.nfa.sharedbuffer; |
| |
| import org.apache.flink.api.common.typeutils.base.TypeSerializerSingleton; |
| import org.apache.flink.cep.nfa.DeweyNumber; |
| import org.apache.flink.core.memory.DataInputView; |
| import org.apache.flink.core.memory.DataOutputView; |
| |
| import java.io.IOException; |
| |
| /** |
| * Versioned edge in {@link SharedBuffer} that allows retrieving predecessors. |
| */ |
| public class SharedBufferEdge { |
| |
| private final NodeId target; |
| private final DeweyNumber deweyNumber; |
| |
| /** |
| * Creates versioned (with {@link DeweyNumber}) edge that points to the target entry. |
| * |
| * @param target id of target entry |
| * @param deweyNumber version for this edge |
| */ |
| public SharedBufferEdge(NodeId target, DeweyNumber deweyNumber) { |
| this.target = target; |
| this.deweyNumber = deweyNumber; |
| } |
| |
| NodeId getTarget() { |
| return target; |
| } |
| |
| DeweyNumber getDeweyNumber() { |
| return deweyNumber; |
| } |
| |
| @Override |
| public String toString() { |
| return "SharedBufferEdge{" + |
| "target=" + target + |
| ", deweyNumber=" + deweyNumber + |
| '}'; |
| } |
| |
| /** Serializer for {@link SharedBufferEdge}. */ |
| public static class SharedBufferEdgeSerializer extends TypeSerializerSingleton<SharedBufferEdge> { |
| |
| private static final long serialVersionUID = -5122474955050663979L; |
| |
| static final SharedBufferEdgeSerializer INSTANCE = new SharedBufferEdgeSerializer(); |
| |
| private SharedBufferEdgeSerializer() {} |
| |
| @Override |
| public boolean isImmutableType() { |
| return true; |
| } |
| |
| @Override |
| public SharedBufferEdge createInstance() { |
| return null; |
| } |
| |
| @Override |
| public SharedBufferEdge copy(SharedBufferEdge from) { |
| return new SharedBufferEdge(from.target, from.deweyNumber); |
| } |
| |
| @Override |
| public SharedBufferEdge copy(SharedBufferEdge from, SharedBufferEdge reuse) { |
| return copy(from); |
| } |
| |
| @Override |
| public int getLength() { |
| return -1; |
| } |
| |
| @Override |
| public void serialize(SharedBufferEdge record, DataOutputView target) throws IOException { |
| NodeId.NodeIdSerializer.INSTANCE.serialize(record.target, target); |
| DeweyNumber.DeweyNumberSerializer.INSTANCE.serialize(record.deweyNumber, target); |
| } |
| |
| @Override |
| public SharedBufferEdge deserialize(DataInputView source) throws IOException { |
| NodeId target = NodeId.NodeIdSerializer.INSTANCE.deserialize(source); |
| DeweyNumber deweyNumber = DeweyNumber.DeweyNumberSerializer.INSTANCE.deserialize(source); |
| return new SharedBufferEdge(target, deweyNumber); |
| } |
| |
| @Override |
| public SharedBufferEdge deserialize(SharedBufferEdge reuse, DataInputView source) throws IOException { |
| return deserialize(source); |
| } |
| |
| @Override |
| public void copy(DataInputView source, DataOutputView target) throws IOException { |
| NodeId.NodeIdSerializer.INSTANCE.copy(source, target); |
| DeweyNumber.DeweyNumberSerializer.INSTANCE.copy(source, target); |
| } |
| |
| @Override |
| public boolean canEqual(Object obj) { |
| return obj.getClass().equals(SharedBufferEdgeSerializer.class); |
| } |
| } |
| } |