/*
* 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.functions;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.sink.PrintSinkFunction;
import org.apache.flink.streaming.api.operators.StreamingRuntimeContext;
import org.junit.After;
import org.junit.Assert;
import org.junit.Test;
import org.mockito.Mockito;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import static org.junit.Assert.assertEquals;
/**
* Tests for the {@link org.apache.flink.streaming.api.functions.sink.PrintSinkFunction}.
*/
public class PrintSinkFunctionTest {
public PrintStream printStreamOriginal = System.out;
private String line = System.lineSeparator();
@Test
public void testPrintSinkStdOut(){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream stream = new PrintStream(baos);
System.setOut(stream);
final StreamingRuntimeContext ctx = Mockito.mock(StreamingRuntimeContext.class);
PrintSinkFunction<String> printSink = new PrintSinkFunction<>();
printSink.setRuntimeContext(ctx);
try {
printSink.open(new Configuration());
} catch (Exception e) {
Assert.fail();
}
printSink.setTargetToStandardOut();
printSink.invoke("hello world!");
assertEquals("Print to System.out", printSink.toString());
assertEquals("hello world!" + line, baos.toString());
printSink.close();
stream.close();
}
@Test
public void testPrintSinkStdErr(){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream stream = new PrintStream(baos);
System.setOut(stream);
final StreamingRuntimeContext ctx = Mockito.mock(StreamingRuntimeContext.class);
PrintSinkFunction<String> printSink = new PrintSinkFunction<>();
printSink.setRuntimeContext(ctx);
try {
printSink.open(new Configuration());
} catch (Exception e) {
Assert.fail();
}
printSink.setTargetToStandardErr();
printSink.invoke("hello world!");
assertEquals("Print to System.err", printSink.toString());
assertEquals("hello world!" + line, baos.toString());
printSink.close();
stream.close();
}
@Test
public void testPrintSinkWithPrefix(){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream stream = new PrintStream(baos);
System.setOut(stream);
final StreamingRuntimeContext ctx = Mockito.mock(StreamingRuntimeContext.class);
Mockito.when(ctx.getNumberOfParallelSubtasks()).thenReturn(2);
Mockito.when(ctx.getIndexOfThisSubtask()).thenReturn(1);
PrintSinkFunction<String> printSink = new PrintSinkFunction<>();
printSink.setRuntimeContext(ctx);
try {
printSink.open(new Configuration());
} catch (Exception e) {
Assert.fail();
}
printSink.setTargetToStandardErr();
printSink.invoke("hello world!");
assertEquals("Print to System.err", printSink.toString());
assertEquals("2> hello world!" + line, baos.toString());
printSink.close();
stream.close();
}
@After
public void restoreSystemOut() {
System.setOut(printStreamOriginal);
}
}