/*
* 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.api.operators;
import org.apache.flink.api.common.functions.AbstractRichFunction;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.state.ListState;
import org.apache.flink.api.common.state.ListStateDescriptor;
import org.apache.flink.api.common.typeutils.base.IntSerializer;
import org.apache.flink.api.java.operators.translation.WrappingFunction;
import org.apache.flink.runtime.state.FunctionInitializationContext;
import org.apache.flink.runtime.state.FunctionSnapshotContext;
import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction;
import org.apache.flink.streaming.api.checkpoint.ListCheckpointed;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import org.apache.flink.streaming.runtime.tasks.OperatorStateHandles;
import org.apache.flink.streaming.util.OneInputStreamOperatorTestHarness;
import org.junit.Assert;
import org.junit.Test;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
public class WrappingFunctionSnapshotRestoreTest {
@Test
public void testSnapshotAndRestoreWrappedCheckpointedFunction() throws Exception {
StreamMap<Integer, Integer> operator = new StreamMap<>(
new WrappingTestFun(new WrappingTestFun(new InnerTestFun())));
OneInputStreamOperatorTestHarness<Integer, Integer> testHarness =
new OneInputStreamOperatorTestHarness<>(operator);
testHarness.setup();
testHarness.open();
testHarness.processElement(new StreamRecord<>(5, 12L));
// snapshot and restore from scratch
OperatorStateHandles snapshot = testHarness.snapshot(0, 0);
testHarness.close();
InnerTestFun innerTestFun = new InnerTestFun();
operator = new StreamMap<>(new WrappingTestFun(new WrappingTestFun(innerTestFun)));
testHarness = new OneInputStreamOperatorTestHarness<>(operator);
testHarness.setup();
testHarness.initializeState(snapshot);
testHarness.open();
Assert.assertTrue(innerTestFun.wasRestored);
testHarness.close();
}
@Test
public void testSnapshotAndRestoreWrappedListCheckpointed() throws Exception {
StreamMap<Integer, Integer> operator = new StreamMap<>(
new WrappingTestFun(new WrappingTestFun(new InnerTestFunList())));
OneInputStreamOperatorTestHarness<Integer, Integer> testHarness =
new OneInputStreamOperatorTestHarness<>(operator);
testHarness.setup();
testHarness.open();
testHarness.processElement(new StreamRecord<>(5, 12L));
// snapshot and restore from scratch
OperatorStateHandles snapshot = testHarness.snapshot(0, 0);
testHarness.close();
InnerTestFunList innerTestFun = new InnerTestFunList();
operator = new StreamMap<>(new WrappingTestFun(new WrappingTestFun(innerTestFun)));
testHarness = new OneInputStreamOperatorTestHarness<>(operator);
testHarness.setup();
testHarness.initializeState(snapshot);
testHarness.open();
Assert.assertTrue(innerTestFun.wasRestored);
testHarness.close();
}
static class WrappingTestFun
extends WrappingFunction<MapFunction<Integer, Integer>> implements MapFunction<Integer, Integer> {
private static final long serialVersionUID = 1L;
public WrappingTestFun(MapFunction<Integer, Integer> wrappedFunction) {
super(wrappedFunction);
}
@Override
public Integer map(Integer value) throws Exception {
return value;
}
}
static class InnerTestFun
extends AbstractRichFunction implements MapFunction<Integer, Integer>, CheckpointedFunction {
private static final long serialVersionUID = 1L;
private ListState<Integer> serializableListState;
private boolean wasRestored;
public InnerTestFun() {
wasRestored = false;
}
@Override
public void snapshotState(FunctionSnapshotContext context) throws Exception {
if (!wasRestored) {
serializableListState.add(42);
}
}
@Override
public void initializeState(FunctionInitializationContext context) throws Exception {
serializableListState = context
.getOperatorStateStore()
.getListState(new ListStateDescriptor<>("test-state", IntSerializer.INSTANCE));
if (context.isRestored()) {
Iterator<Integer> integers = serializableListState.get().iterator();
int act = integers.next();
Assert.assertEquals(42, act);
Assert.assertFalse(integers.hasNext());
wasRestored = true;
}
}
@Override
public Integer map(Integer value) throws Exception {
return value;
}
}
static class InnerTestFunList
extends AbstractRichFunction implements MapFunction<Integer, Integer>, ListCheckpointed<Integer> {
private static final long serialVersionUID = 1L;
private boolean wasRestored;
public InnerTestFunList() {
wasRestored = false;
}
@Override
public List<Integer> snapshotState(long checkpointId, long timestamp) throws Exception {
return Collections.singletonList(42);
}
@Override
public void restoreState(List<Integer> state) throws Exception {
Assert.assertEquals(1, state.size());
int val = state.get(0);
Assert.assertEquals(42, val);
wasRestored = true;
}
@Override
public Integer map(Integer value) throws Exception {
return value;
}
}
}