Github user dawidwys commented on a diff in the pull request: https://github.com/apache/flink/pull/4145#discussion_r122974349 --- Diff: flink-libraries/flink-cep/src/main/java/org/apache/flink/cep/nfa/ConditionRegistry.java --- @@ -0,0 +1,135 @@ +/* + * 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.functions.RuntimeContext; +import org.apache.flink.api.common.functions.util.FunctionUtils; +import org.apache.flink.cep.pattern.conditions.IterativeCondition; +import org.apache.flink.configuration.Configuration; + +import java.io.Serializable; +import java.util.HashMap; +import java.util.Map; +import java.util.Objects; + +/** + * The {@link ConditionRegistry} is a registry to manage the mapping from a {@link StateTransition} + * to the {@link IterativeCondition}. A {@link StateTransition} is unique in a {@link NFA}, that's + * why we use {@link StateTransition} as the key. + */ +public class ConditionRegistry implements Serializable { + private static final long serialVersionUID = -4130291010425184830L; + + private final Map<TransitionInfo, IterativeCondition<?>> registeredConditions; + + private final TransitionInfo reuse = new TransitionInfo(); + + /** + * Creates a new condition registry. + */ + public ConditionRegistry() { + this.registeredConditions = new HashMap<>(); --- End diff -- Personally prefer initializing it in the static part of the class. It is easier to navigate. Anyway it is already done this way for `TransitionInfo reuse`.
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