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From dawidwys <...@git.apache.org>
Subject [GitHub] flink pull request #4145: [FLINK-6938][FLINK-6939] [cep] Not store Iterative...
Date Tue, 20 Jun 2017 09:03:32 GMT
Github user dawidwys commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4145#discussion_r122918782
  
    --- 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<>();
    +	}
    +
    +	/**
    +	 * Registers an {@link IterativeCondition} for the {@link StateTransition}.
    +	 * @param transition the state transition
    +	 * @param condition the condition to register, maybe null
    +	 */
    +	public <T> void registerCondition(StateTransition<T> transition, IterativeCondition<T>
condition) {
    +		registeredConditions.put(new TransitionInfo(transition), condition);
    +	}
    +
    +	/**
    +	 * Gets the corresponding {@link IterativeCondition} with the given {@link StateTransition}.
    +	 * @param transition the state transition
    +	 * @return the corresponding {@link IterativeCondition}, maybe null.
    +	 */
    +	public <T> IterativeCondition<T> getCondition(StateTransition<T> transition)
{
    +		reuse.update(transition);
    +		//noinspection unchecked
    +		return (IterativeCondition<T>) registeredConditions.get(reuse);
    +	}
    +
    +	/**
    +	 * Opens every non-null conditions.
    +	 */
    +	public void open() throws Exception {
    +		for (IterativeCondition<?> condition : registeredConditions.values()) {
    +			if (condition != null) {
    +				FunctionUtils.openFunction(condition, new Configuration());
    +			}
    +		}
    +	}
    +
    +	/**
    +	 * Sets the RuntimeContext for every non-null conditions.
    +	 * @param context the runtime context
    +	 */
    +	public void setRuntimeContext(RuntimeContext context) {
    +		for (IterativeCondition<?> condition : registeredConditions.values()) {
    +			if (condition != null) {
    +				FunctionUtils.setFunctionRuntimeContext(condition, context);
    +			}
    +		}
    +	}
    +
    +	private static class TransitionInfo implements Serializable {
    +		private static final long serialVersionUID = -6446693486080356589L;
    +
    +		private StateTransitionAction action;
    +		private String sourceStateName;
    +		private String targetStateName;
    +
    +		TransitionInfo(){
    +		}
    +
    +		TransitionInfo(StateTransition<?> transition) {
    +			this.action = transition.getAction();
    --- End diff --
    
    Could we use `update()` here?


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