| /* |
| * 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; |
| |
| import org.apache.flink.api.common.typeutils.TypeSerializer; |
| import org.apache.flink.api.common.typeutils.base.EnumSerializer; |
| import org.apache.flink.api.common.typeutils.base.LongSerializer; |
| import org.apache.flink.api.common.typeutils.base.StringSerializer; |
| import org.apache.flink.cep.nfa.sharedbuffer.EventId; |
| import org.apache.flink.cep.nfa.sharedbuffer.NodeId; |
| import org.apache.flink.core.memory.DataInputView; |
| import org.apache.flink.util.Preconditions; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.util.LinkedList; |
| import java.util.Queue; |
| |
| /** |
| * Methods for deserialization of old format NFA. |
| */ |
| class MigrationUtils { |
| |
| /** |
| * Skips bytes corresponding to serialized states. In flink 1.6+ the states are no longer kept in state. |
| */ |
| static void skipSerializedStates(DataInputView in) throws IOException { |
| TypeSerializer<String> nameSerializer = StringSerializer.INSTANCE; |
| TypeSerializer<State.StateType> stateTypeSerializer = new EnumSerializer<>(State.StateType.class); |
| TypeSerializer<StateTransitionAction> actionSerializer = new EnumSerializer<>(StateTransitionAction.class); |
| |
| final int noOfStates = in.readInt(); |
| |
| for (int i = 0; i < noOfStates; i++) { |
| nameSerializer.deserialize(in); |
| stateTypeSerializer.deserialize(in); |
| } |
| |
| for (int i = 0; i < noOfStates; i++) { |
| String srcName = nameSerializer.deserialize(in); |
| |
| int noOfTransitions = in.readInt(); |
| for (int j = 0; j < noOfTransitions; j++) { |
| String src = nameSerializer.deserialize(in); |
| Preconditions.checkState(src.equals(srcName), |
| "Source Edge names do not match (" + srcName + " - " + src + ")."); |
| |
| nameSerializer.deserialize(in); |
| actionSerializer.deserialize(in); |
| |
| try { |
| skipCondition(in); |
| } catch (ClassNotFoundException e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| } |
| |
| private static void skipCondition(DataInputView in) throws IOException, ClassNotFoundException { |
| boolean hasCondition = in.readBoolean(); |
| if (hasCondition) { |
| int length = in.readInt(); |
| |
| byte[] serCondition = new byte[length]; |
| in.read(serCondition); |
| |
| ByteArrayInputStream bais = new ByteArrayInputStream(serCondition); |
| ObjectInputStream ois = new ObjectInputStream(bais); |
| |
| ois.readObject(); |
| ois.close(); |
| bais.close(); |
| } |
| } |
| |
| static <T> Queue<ComputationState> deserializeComputationStates( |
| org.apache.flink.cep.nfa.SharedBuffer<T> sharedBuffer, |
| TypeSerializer<T> eventSerializer, |
| DataInputView source) throws IOException { |
| |
| Queue<ComputationState> computationStates = new LinkedList<>(); |
| StringSerializer stateNameSerializer = StringSerializer.INSTANCE; |
| LongSerializer timestampSerializer = LongSerializer.INSTANCE; |
| DeweyNumber.DeweyNumberSerializer versionSerializer = DeweyNumber.DeweyNumberSerializer.INSTANCE; |
| |
| int computationStateNo = source.readInt(); |
| for (int i = 0; i < computationStateNo; i++) { |
| String state = stateNameSerializer.deserialize(source); |
| String prevState = stateNameSerializer.deserialize(source); |
| long timestamp = timestampSerializer.deserialize(source); |
| DeweyNumber version = versionSerializer.deserialize(source); |
| long startTimestamp = timestampSerializer.deserialize(source); |
| int counter = source.readInt(); |
| |
| T event = null; |
| if (source.readBoolean()) { |
| event = eventSerializer.deserialize(source); |
| } |
| |
| NodeId nodeId; |
| EventId startEventId; |
| if (prevState != null) { |
| nodeId = sharedBuffer.getNodeId(prevState, timestamp, counter, event); |
| startEventId = sharedBuffer.getStartEventId(version.getRun()); |
| } else { |
| nodeId = null; |
| startEventId = null; |
| } |
| |
| computationStates.add(ComputationState.createState(state, nodeId, version, startTimestamp, startEventId)); |
| } |
| return computationStates; |
| } |
| |
| private MigrationUtils() { |
| } |
| } |