| /* |
| * 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; |
| |
| import org.apache.flink.cep.pattern.Pattern; |
| import org.apache.flink.streaming.api.datastream.DataStream; |
| |
| /** |
| * Utility class for complex event processing. |
| * |
| * <p>Methods which transform a {@link DataStream} into a {@link PatternStream} to do CEP. |
| */ |
| public class CEP { |
| /** |
| * Creates a {@link PatternStream} from an input data stream and a pattern. |
| * |
| * @param input DataStream containing the input events |
| * @param pattern Pattern specification which shall be detected |
| * @param <T> Type of the input events |
| * @return Resulting pattern stream |
| */ |
| public static <T> PatternStream<T> pattern(DataStream<T> input, Pattern<T, ?> pattern) { |
| return new PatternStream<>(input, pattern); |
| } |
| |
| /** |
| * Creates a {@link PatternStream} from an input data stream and a pattern. |
| * |
| * @param input DataStream containing the input events |
| * @param pattern Pattern specification which shall be detected |
| * @param comparator Comparator to sort events with equal timestamps |
| * @param <T> Type of the input events |
| * @return Resulting pattern stream |
| */ |
| public static <T> PatternStream<T> pattern(DataStream<T> input, Pattern<T, ?> pattern, EventComparator<T> comparator) { |
| return new PatternStream<>(input, pattern, comparator); |
| } |
| } |