/
ByteBufFluxTest.java
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/
ByteBufFluxTest.java
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/*
* Copyright (c) 2017-2022 VMware, Inc. or its affiliates, All Rights Reserved.
*
* Licensed 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
*
* https://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 reactor.netty;
import io.netty.buffer.ByteBuf;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.test.StepVerifier;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.time.Duration;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import static org.assertj.core.api.Assertions.assertThat;
class ByteBufFluxTest {
private static File temporaryDirectory;
@BeforeAll
static void createTempDir() {
temporaryDirectory = createTemporaryDirectory();
}
@AfterAll
static void deleteTempDir() {
deleteTemporaryDirectoryRecursively(temporaryDirectory);
}
@Test
void testFromString_EmptyFlux() {
doTestFromStringEmptyPublisher(Flux.empty());
}
@Test
void testFromString_EmptyMono() {
doTestFromStringEmptyPublisher(Mono.empty());
}
@Test
void testFromString_Callable() {
doTestFromString(Mono.fromCallable(() -> "123"));
}
@Test
void testFromString_Flux() {
List<String> original = Arrays.asList("1", "2", "3");
StepVerifier.create(ByteBufFlux.fromString(Flux.fromIterable(original)).collectList())
.expectNextMatches(list -> {
List<String> newList =
list.stream()
.map(b -> {
String result = b.toString(Charset.defaultCharset());
b.release();
return result;
})
.collect(Collectors.toList());
return Objects.equals(original, newList);
})
.expectComplete()
.verify(Duration.ofSeconds(30));
}
@Test
void testFromString_Mono() {
doTestFromString(Mono.just("123"));
}
private void doTestFromString(Publisher<? extends String> source) {
StepVerifier.create(ByteBufFlux.fromString(source))
.expectNextMatches(b -> {
String result = b.toString(Charset.defaultCharset());
b.release();
return "123".equals(result);
})
.expectComplete()
.verify(Duration.ofSeconds(30));
}
private void doTestFromStringEmptyPublisher(Publisher<? extends String> source) {
StepVerifier.create(ByteBufFlux.fromString(source))
.expectComplete()
.verify(Duration.ofSeconds(30));
}
@Test
void testFromPath() throws Exception {
// Create a temporary file with some binary data that will be read in chunks using the ByteBufFlux
final int chunkSize = 3;
final Path tmpFile = new File(temporaryDirectory, "content.in").toPath();
final byte[] data = new byte[]{0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9};
Files.write(tmpFile, data);
// Make sure the file is 10 bytes (i.e. the same as the data length)
assertThat(data.length).isEqualTo(Files.size(tmpFile));
// Use the ByteBufFlux to read the file in chunks of 3 bytes max and write them into a ByteArrayOutputStream for verification
final Iterator<ByteBuf> it = ByteBufFlux.fromPath(tmpFile, chunkSize)
.toIterable()
.iterator();
final ByteArrayOutputStream out = new ByteArrayOutputStream();
while (it.hasNext()) {
ByteBuf bb = it.next();
byte[] read = new byte[bb.readableBytes()];
bb.readBytes(read);
bb.release();
assertThat(bb.readableBytes()).isEqualTo(0);
out.write(read);
}
// Verify that we read the file.
assertThat(data).isEqualTo(out.toByteArray());
System.out.println(Files.exists(tmpFile));
}
private static File createTemporaryDirectory() {
try {
final File tempDir = Files.createTempDirectory("ByteBufFluxTest").toFile();
return tempDir;
}
catch (Exception e) {
throw new RuntimeException("Error creating the temporary directory", e);
}
}
private static void deleteTemporaryDirectoryRecursively(final File file) {
if (temporaryDirectory == null || !temporaryDirectory.exists()) {
return;
}
final File[] files = file.listFiles();
if (files != null) {
for (File childFile : files) {
deleteTemporaryDirectoryRecursively(childFile);
}
}
file.deleteOnExit();
}
}