[MINOR] feat(server): Introduce LocalFileBlackHoleWriter for test flush ceiling performance

storage/src/main/java/org/apache/uniffle/storage/handler/impl/LocalFileBlackHoleWriter.java

@@ -0,0 +1,57 @@
+/*
+ * 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.uniffle.storage.handler.impl;
+
+import java.io.File;
+import java.io.IOException;
+
+import io.netty.buffer.ByteBuf;
+
+import org.apache.uniffle.storage.api.FileWriter;
+import org.apache.uniffle.storage.common.FileBasedShuffleSegment;
+
+/** A shuffle writer that write data into black hole for performance test purpose only. */
+public class LocalFileBlackHoleWriter implements FileWriter {
+
+  private long nextOffset;
+
+  public LocalFileBlackHoleWriter(File file, int bufferSize) {}
+
+  @Override
+  public void writeData(byte[] data) throws IOException {
+    nextOffset = nextOffset + data.length;
+  }
+
+  @Override
+  public void writeData(ByteBuf buf) throws IOException {
+    if (buf != null && buf.readableBytes() > 0) {
+      nextOffset = nextOffset + buf.readableBytes();
+    }
+  }
+
+  @Override
+  public void writeIndex(FileBasedShuffleSegment segment) throws IOException {}
+
+  @Override
+  public long nextOffset() {
+    return nextOffset;
+  }
+
+  @Override
+  public synchronized void close() throws IOException {}
+}