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[FLINK-7008] [cep] Update NFA state only when the NFA changes
This closes apache#4195.
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180
flink-libraries/flink-cep/src/test/java/org/apache/flink/cep/nfa/NFAStatusChangeITCase.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.cep.nfa; | ||
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| import org.apache.flink.api.java.tuple.Tuple2; | ||
| import org.apache.flink.cep.Event; | ||
| import org.apache.flink.cep.nfa.compiler.NFACompiler; | ||
| import org.apache.flink.cep.pattern.Pattern; | ||
| import org.apache.flink.cep.pattern.conditions.IterativeCondition; | ||
| import org.apache.flink.cep.pattern.conditions.SimpleCondition; | ||
| import org.apache.flink.streaming.api.windowing.time.Time; | ||
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| import org.junit.Test; | ||
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| import java.util.Collection; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| import static org.junit.Assert.assertFalse; | ||
| import static org.junit.Assert.assertTrue; | ||
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| /** | ||
| * Tests if the {@link NFA} status ({@link NFA#computationStates} or {@link NFA#eventSharedBuffer}) | ||
| * is changed after processing events. | ||
| */ | ||
| public class NFAStatusChangeITCase { | ||
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| @Test | ||
| public void testNFAChange() { | ||
| Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() { | ||
| private static final long serialVersionUID = 1858562682635302605L; | ||
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| @Override | ||
| public boolean filter(Event value) throws Exception { | ||
| return value.getName().equals("a"); | ||
| } | ||
| }).followedByAny("middle").where(new IterativeCondition<Event>() { | ||
| private static final long serialVersionUID = 8061969839441121955L; | ||
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| @Override | ||
| public boolean filter(Event value, Context<Event> ctx) throws Exception { | ||
| return value.getName().equals("b"); | ||
| } | ||
| }).oneOrMore().optional().allowCombinations().followedBy("middle2").where(new IterativeCondition<Event>() { | ||
| private static final long serialVersionUID = 8061969839441121955L; | ||
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| @Override | ||
| public boolean filter(Event value, Context<Event> ctx) throws Exception { | ||
| return value.getName().equals("d"); | ||
| } | ||
| }).followedBy("end").where(new IterativeCondition<Event>() { | ||
| private static final long serialVersionUID = 8061969839441121955L; | ||
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| @Override | ||
| public boolean filter(Event value, Context<Event> ctx) throws Exception { | ||
| return value.getName().equals("e"); | ||
| } | ||
| }).within(Time.milliseconds(10)); | ||
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| NFACompiler.NFAFactory<Event> nfaFactory = NFACompiler.compileFactory(pattern, Event.createTypeSerializer(), true); | ||
| NFA<Event> nfa = nfaFactory.createNFA(); | ||
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| nfa.process(new Event(1, "b", 1.0), 1L); | ||
| assertFalse("NFA status should not change as the event does not match the take condition of the 'start' state", nfa.isNFAChanged()); | ||
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| nfa.resetNFAChanged(); | ||
| nfa.process(new Event(2, "a", 1.0), 2L); | ||
| assertTrue("NFA status should change as the event matches the take condition of the 'start' state", nfa.isNFAChanged()); | ||
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| // the status of the queue of ComputationStatus changed, | ||
| // more than one ComputationStatus is generated by the event from some ComputationStatus | ||
| nfa.resetNFAChanged(); | ||
| nfa.process(new Event(3, "f", 1.0), 3L); | ||
| assertTrue("NFA status should change as the event matches the ignore condition and proceed condition of the 'middle:1' state", nfa.isNFAChanged()); | ||
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| // both the queue of ComputationStatus and eventSharedBuffer have not changed | ||
| nfa.resetNFAChanged(); | ||
| nfa.process(new Event(4, "f", 1.0), 4L); | ||
| assertFalse("NFA status should not change as the event only matches the ignore condition of the 'middle:2' state and the target state is still 'middle:2'", nfa.isNFAChanged()); | ||
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| // both the queue of ComputationStatus and eventSharedBuffer have changed | ||
| nfa.resetNFAChanged(); | ||
| nfa.process(new Event(5, "b", 1.0), 5L); | ||
| assertTrue("NFA status should change as the event matches the take condition of 'middle:2' state", nfa.isNFAChanged()); | ||
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| // both the queue of ComputationStatus and eventSharedBuffer have changed | ||
| nfa.resetNFAChanged(); | ||
| nfa.process(new Event(6, "d", 1.0), 6L); | ||
| assertTrue("NFA status should change as the event matches the take condition of 'middle2' state", nfa.isNFAChanged()); | ||
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| // both the queue of ComputationStatus and eventSharedBuffer have not changed | ||
| // as the timestamp is within the window | ||
| nfa.resetNFAChanged(); | ||
| nfa.process(null, 8L); | ||
| assertFalse("NFA status should not change as the timestamp is within the window", nfa.isNFAChanged()); | ||
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| // timeout ComputationStatus will be removed from the queue of ComputationStatus and timeout event will | ||
| // be removed from eventSharedBuffer as the timeout happens | ||
| nfa.resetNFAChanged(); | ||
| Collection<Tuple2<Map<String, List<Event>>, Long>> timeoutResults = nfa.process(null, 12L).f1; | ||
| assertTrue("NFA status should change as timeout happens", nfa.isNFAChanged() && !timeoutResults.isEmpty()); | ||
| } | ||
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| @Test | ||
| public void testNFAChangedOnOneNewComputationState() { | ||
| Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new SimpleCondition<Event>() { | ||
| @Override | ||
| public boolean filter(Event value) throws Exception { | ||
| return value.getName().equals("start"); | ||
| } | ||
| }).followedBy("a*").where(new SimpleCondition<Event>() { | ||
| private static final long serialVersionUID = 1858562682635302605L; | ||
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| @Override | ||
| public boolean filter(Event value) throws Exception { | ||
| return value.getName().equals("a"); | ||
| } | ||
| }).oneOrMore().optional().next("end").where(new IterativeCondition<Event>() { | ||
| private static final long serialVersionUID = 8061969839441121955L; | ||
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| @Override | ||
| public boolean filter(Event value, Context<Event> ctx) throws Exception { | ||
| return value.getName().equals("b"); | ||
| } | ||
| }).within(Time.milliseconds(10)); | ||
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| NFACompiler.NFAFactory<Event> nfaFactory = NFACompiler.compileFactory(pattern, Event.createTypeSerializer(), true); | ||
| NFA<Event> nfa = nfaFactory.createNFA(); | ||
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| nfa.resetNFAChanged(); | ||
| nfa.process(new Event(6, "start", 1.0), 6L); | ||
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| nfa.resetNFAChanged(); | ||
| nfa.process(new Event(6, "a", 1.0), 7L); | ||
| assertTrue(nfa.isNFAChanged()); | ||
| } | ||
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| @Test | ||
| public void testNFAChangedOnTimeoutWithoutPrune() { | ||
| Pattern<Event, ?> pattern = Pattern.<Event>begin("start").where(new IterativeCondition<Event>() { | ||
| @Override | ||
| public boolean filter(Event value, Context<Event> ctx) throws Exception { | ||
| return value.getName().equals("start"); | ||
| } | ||
| }).followedBy("end").where(new IterativeCondition<Event>() { | ||
| private static final long serialVersionUID = 8061969839441121955L; | ||
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| @Override | ||
| public boolean filter(Event value, Context<Event> ctx) throws Exception { | ||
| return value.getName().equals("end"); | ||
| } | ||
| }).within(Time.milliseconds(10)); | ||
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| NFACompiler.NFAFactory<Event> nfaFactory = NFACompiler.compileFactory(pattern, Event.createTypeSerializer(), true); | ||
| NFA<Event> nfa = nfaFactory.createNFA(); | ||
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| nfa.resetNFAChanged(); | ||
| nfa.process(new Event(6, "start", 1.0), 6L); | ||
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| nfa.resetNFAChanged(); | ||
| nfa.process(new Event(6, "end", 1.0), 17L); | ||
| assertTrue(nfa.isNFAChanged()); | ||
| } | ||
| } |
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