/*
* 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.checkpoint;
import org.apache.flink.api.common.functions.RichMapFunction;
import org.apache.flink.streaming.api.operators.StreamMap;
import org.apache.flink.streaming.runtime.tasks.OperatorStateHandles;
import org.apache.flink.streaming.util.AbstractStreamOperatorTestHarness;
import org.junit.Assert;
import org.junit.Test;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class ListCheckpointedTest {
@Test
public void testUDFReturningNull() throws Exception {
TestUserFunction userFunction = new TestUserFunction(null);
AbstractStreamOperatorTestHarness<Integer> testHarness =
new AbstractStreamOperatorTestHarness<>(new StreamMap<>(userFunction), 1, 1, 0);
testHarness.open();
OperatorStateHandles snapshot = testHarness.snapshot(0L, 0L);
testHarness.initializeState(snapshot);
Assert.assertTrue(userFunction.isRestored());
}
@Test
public void testUDFReturningEmpty() throws Exception {
TestUserFunction userFunction = new TestUserFunction(Collections.<Integer>emptyList());
AbstractStreamOperatorTestHarness<Integer> testHarness =
new AbstractStreamOperatorTestHarness<>(new StreamMap<>(userFunction), 1, 1, 0);
testHarness.open();
OperatorStateHandles snapshot = testHarness.snapshot(0L, 0L);
testHarness.initializeState(snapshot);
Assert.assertTrue(userFunction.isRestored());
}
@Test
public void testUDFReturningData() throws Exception {
TestUserFunction userFunction = new TestUserFunction(Arrays.asList(1, 2, 3));
AbstractStreamOperatorTestHarness<Integer> testHarness =
new AbstractStreamOperatorTestHarness<>(new StreamMap<>(userFunction), 1, 1, 0);
testHarness.open();
OperatorStateHandles snapshot = testHarness.snapshot(0L, 0L);
testHarness.initializeState(snapshot);
Assert.assertTrue(userFunction.isRestored());
}
private static class TestUserFunction extends RichMapFunction<Integer, Integer> implements ListCheckpointed<Integer> {
private static final long serialVersionUID = -8981369286399531925L;
private final List<Integer> expected;
private boolean restored;
public TestUserFunction(List<Integer> expected) {
this.expected = expected;
this.restored = false;
}
@Override
public Integer map(Integer value) throws Exception {
return value;
}
@Override
public List<Integer> snapshotState(long checkpointId, long timestamp) throws Exception {
return expected;
}
@Override
public void restoreState(List<Integer> state) throws Exception {
if (null != expected) {
Assert.assertEquals(expected, state);
} else {
Assert.assertTrue(state.isEmpty());
}
restored = true;
}
public boolean isRestored() {
return restored;
}
}
}