1 /* 2 * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.openjdk.bench.java.nio; 24 25 import java.nio.CharBuffer; 26 import java.util.concurrent.TimeUnit; 27 28 import org.openjdk.jmh.annotations.Benchmark; 29 import org.openjdk.jmh.annotations.Fork; 30 import org.openjdk.jmh.annotations.Measurement; 31 import org.openjdk.jmh.annotations.Scope; 32 import org.openjdk.jmh.annotations.State; 33 import org.openjdk.jmh.annotations.Warmup; 34 35 /** 36 * Benchmark for bulk get methods of a {@code CharBuffer} created from a 37 * {@code CharSequence}. 38 */ 39 40 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS) 41 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS) 42 @State(Scope.Benchmark) 43 @Fork(1) 44 public class StringCharBufferBulkTransfer { 45 private static final int LENGTH = 16384; 46 47 char[] buf = new char[LENGTH]; 48 @SuppressWarnings("initialization") 49 CharBuffer cb = CharBuffer.wrap(new String(buf)); 50 char[] dst = new char[LENGTH]; 51 CharBuffer cbw = CharBuffer.allocate(LENGTH); 52 53 @Benchmark 54 public void absoluteBulkGet() { 55 cb.get(0, dst, 0, dst.length); 56 } 57 58 @Benchmark 59 public void relativeBulkGet() { 60 cb.get(dst, 0, dst.length); 61 cb.position(0); 62 } 63 64 @Benchmark 65 public void getChars() { 66 cb.getChars(0, LENGTH, dst, 0); 67 } 68 69 @Benchmark 70 public void absoluteBulkPut() { 71 cbw.put(0, cb, 0, dst.length); 72 } 73 }