Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21346#discussion_r195592355
--- Diff:
common/network-common/src/test/java/org/apache/spark/network/StreamTestHelper.java
---
@@ -0,0 +1,102 @@
+/*
+ * 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.spark.network;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.nio.ByteBuffer;
+import java.util.Random;
+
+import com.google.common.io.Files;
+
+import org.apache.spark.network.buffer.FileSegmentManagedBuffer;
+import org.apache.spark.network.buffer.ManagedBuffer;
+import org.apache.spark.network.buffer.NioManagedBuffer;
+import org.apache.spark.network.util.TransportConf;
+
+class StreamTestHelper {
+ static final String[] STREAMS = { "largeBuffer", "smallBuffer",
"emptyBuffer", "file" };
+
+ final File testFile;
+ File tempDir;
+
+ ByteBuffer emptyBuffer;
+ ByteBuffer smallBuffer;
+ ByteBuffer largeBuffer;
+
+ private static ByteBuffer createBuffer(int bufSize) {
+ ByteBuffer buf = ByteBuffer.allocate(bufSize);
+ for (int i = 0; i < bufSize; i ++) {
+ buf.put((byte) i);
+ }
+ buf.flip();
+ return buf;
+ }
+
+ StreamTestHelper() throws Exception {
+ tempDir = Files.createTempDir();
+ emptyBuffer = createBuffer(0);
+ smallBuffer = createBuffer(100);
+ largeBuffer = createBuffer(100000);
+
+ testFile = File.createTempFile("stream-test-file", "txt", tempDir);
+ FileOutputStream fp = new FileOutputStream(testFile);
+ try {
+ Random rnd = new Random();
+ for (int i = 0; i < 512; i++) {
+ byte[] fileContent = new byte[1024];
+ rnd.nextBytes(fileContent);
+ fp.write(fileContent);
+ }
+ } finally {
+ fp.close();
+ }
+ }
+
+ public ByteBuffer srcBuffer(String name) {
+ switch (name) {
+ case "largeBuffer":
+ return largeBuffer;
+ case "smallBuffer":
+ return smallBuffer;
+ case "emptyBuffer":
+ return emptyBuffer;
+ default:
+ throw new IllegalArgumentException("Invalid stream: " + name);
+ }
+ }
+
+ public ManagedBuffer openStream(TransportConf conf, String streamId) {
+ switch (streamId) {
+ case "file":
+ return new FileSegmentManagedBuffer(conf, testFile, 0,
testFile.length());
+ default:
+ return new NioManagedBuffer(srcBuffer(streamId));
+ }
+ }
+
+
+ void cleanup() {
+ if (tempDir != null) {
+ for (File f : tempDir.listFiles()) {
--- End diff --
`JavaUtils.deleteRecursively`.
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