| /* |
| * 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.functions.adaptors; |
| |
| import org.apache.flink.annotation.Internal; |
| import org.apache.flink.api.common.functions.util.FunctionUtils; |
| import org.apache.flink.cep.PatternFlatSelectFunction; |
| import org.apache.flink.cep.PatternFlatTimeoutFunction; |
| import org.apache.flink.cep.functions.PatternProcessFunction; |
| import org.apache.flink.cep.functions.TimedOutPartialMatchHandler; |
| import org.apache.flink.configuration.Configuration; |
| import org.apache.flink.util.Collector; |
| import org.apache.flink.util.OutputTag; |
| |
| import java.util.List; |
| import java.util.Map; |
| |
| import static org.apache.flink.util.Preconditions.checkNotNull; |
| |
| /** |
| * Adapter that expresses combination of {@link PatternFlatSelectFunction} and {@link PatternTimeoutFlatSelectAdapter} |
| * with {@link PatternProcessFunction}. |
| */ |
| @Internal |
| public class PatternTimeoutFlatSelectAdapter<IN, OUT, T> |
| extends PatternFlatSelectAdapter<IN, OUT> |
| implements TimedOutPartialMatchHandler<IN> { |
| |
| private final PatternFlatTimeoutFunction<IN, T> flatTimeoutFunction; |
| private final OutputTag<T> timedOutPartialMatchesTag; |
| |
| private transient SideCollector<T> sideCollector; |
| |
| public PatternTimeoutFlatSelectAdapter( |
| PatternFlatSelectFunction<IN, OUT> flatSelectFunction, |
| PatternFlatTimeoutFunction<IN, T> flatTimeoutFunction, |
| OutputTag<T> timedOutPartialMatchesTag) { |
| super(flatSelectFunction); |
| this.flatTimeoutFunction = checkNotNull(flatTimeoutFunction); |
| this.timedOutPartialMatchesTag = checkNotNull(timedOutPartialMatchesTag); |
| } |
| |
| @Override |
| public void open(Configuration parameters) throws Exception { |
| super.open(parameters); |
| FunctionUtils.setFunctionRuntimeContext(flatTimeoutFunction, getRuntimeContext()); |
| FunctionUtils.openFunction(flatTimeoutFunction, parameters); |
| |
| if (sideCollector == null) { |
| sideCollector = new SideCollector<>(checkNotNull(timedOutPartialMatchesTag)); |
| } |
| } |
| |
| @Override |
| public void close() throws Exception { |
| super.close(); |
| FunctionUtils.closeFunction(flatTimeoutFunction); |
| } |
| |
| @Override |
| public void processTimedOutMatch( |
| Map<String, List<IN>> match, |
| Context ctx) throws Exception { |
| sideCollector.setCtx(ctx); |
| flatTimeoutFunction.timeout(match, ctx.timestamp(), sideCollector); |
| } |
| |
| /** |
| * Adapter that emitting timed out results from {@link PatternFlatTimeoutFunction}, which expects {@link Collector} |
| * through the {@link PatternProcessFunction.Context} of enclosing {@link PatternProcessFunction}. |
| */ |
| private static final class SideCollector<T> implements Collector<T> { |
| |
| private final OutputTag<T> timedOutPartialMatchesTag; |
| |
| private transient Context ctx; |
| |
| private SideCollector(OutputTag<T> timedOutPartialMatchesTag) { |
| this.timedOutPartialMatchesTag = checkNotNull(timedOutPartialMatchesTag); |
| } |
| |
| public void setCtx(Context ctx) { |
| this.ctx = ctx; |
| } |
| |
| @Override |
| public void collect(T record) { |
| ctx.output(timedOutPartialMatchesTag, record); |
| } |
| |
| @Override |
| public void close() {} |
| } |
| } |