| /* |
| * 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.streaming.connectors.kafka.testutils; |
| |
| import org.apache.flink.api.java.tuple.Tuple2; |
| import org.apache.flink.streaming.api.checkpoint.ListCheckpointed; |
| import org.apache.flink.streaming.api.functions.sink.RichSinkFunction; |
| import org.apache.flink.test.util.SuccessException; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.BitSet; |
| import java.util.Collections; |
| import java.util.List; |
| |
| /** |
| * A {@link RichSinkFunction} that verifies that no duplicate records are generated. |
| */ |
| public class ValidatingExactlyOnceSink extends RichSinkFunction<Integer> implements ListCheckpointed<Tuple2<Integer, BitSet>> { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(ValidatingExactlyOnceSink.class); |
| |
| private static final long serialVersionUID = 1748426382527469932L; |
| |
| private final int numElementsTotal; |
| |
| private final boolean exitOnFinish; |
| |
| private BitSet duplicateChecker = new BitSet(); // this is checkpointed |
| |
| private int numElements; // this is checkpointed |
| |
| public ValidatingExactlyOnceSink(int numElementsTotal) { |
| this(numElementsTotal, true); |
| } |
| |
| public ValidatingExactlyOnceSink(int numElementsTotal, boolean exitOnFinish) { |
| this.numElementsTotal = numElementsTotal; |
| this.exitOnFinish = exitOnFinish; |
| } |
| |
| @Override |
| public void invoke(Integer value) throws Exception { |
| numElements++; |
| |
| if (duplicateChecker.get(value)) { |
| throw new Exception("Received a duplicate: " + value); |
| } |
| duplicateChecker.set(value); |
| if (numElements == numElementsTotal) { |
| // validate |
| if (duplicateChecker.cardinality() != numElementsTotal) { |
| throw new Exception("Duplicate checker has wrong cardinality"); |
| } |
| else if (duplicateChecker.nextClearBit(0) != numElementsTotal) { |
| throw new Exception("Received sparse sequence"); |
| } else if (exitOnFinish) { |
| throw new SuccessException(); |
| } |
| } else if (numElements > numElementsTotal) { |
| throw new Exception("Receive too many records"); |
| } |
| } |
| |
| @Override |
| public void close() { |
| if (numElements != numElementsTotal) { |
| throw new RuntimeException("Receive too many records"); |
| } |
| } |
| |
| @Override |
| public List<Tuple2<Integer, BitSet>> snapshotState(long checkpointId, long timestamp) throws Exception { |
| LOG.info("Snapshot of counter " + numElements + " at checkpoint " + checkpointId); |
| return Collections.singletonList(new Tuple2<>(numElements, duplicateChecker)); |
| } |
| |
| @Override |
| public void restoreState(List<Tuple2<Integer, BitSet>> state) throws Exception { |
| if (state.isEmpty() || state.size() > 1) { |
| throw new RuntimeException("Test failed due to unexpected recovered state size " + state.size()); |
| } |
| |
| Tuple2<Integer, BitSet> s = state.get(0); |
| LOG.info("restoring num elements to {}", s.f0); |
| this.numElements = s.f0; |
| this.duplicateChecker = s.f1; |
| } |
| } |