1 /*
   2  * Copyright (c) 2014 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.util.stream;
  24 
  25 import org.openjdk.jmh.annotations.Benchmark;
  26 import org.openjdk.jmh.annotations.BenchmarkMode;
  27 import org.openjdk.jmh.annotations.Mode;
  28 import org.openjdk.jmh.annotations.OutputTimeUnit;
  29 import org.openjdk.jmh.annotations.Param;
  30 import org.openjdk.jmh.annotations.Scope;
  31 import org.openjdk.jmh.annotations.Setup;
  32 import org.openjdk.jmh.annotations.State;
  33 
  34 import java.util.concurrent.TimeUnit;
  35 import java.util.function.LongPredicate;
  36 import java.util.stream.LongStream;
  37 
  38 /**
  39  * Benchmark for checking different "noneMatch" schemes.
  40  *
  41  * @author Aleksey Shipilev, aleksey.shipilev@oracle.com
  42  */
  43 @BenchmarkMode(Mode.Throughput)
  44 @OutputTimeUnit(TimeUnit.SECONDS)
  45 @State(Scope.Thread)
  46 public class NoneMatcher {
  47 
  48     /**
  49      * Implementation notes:
  50      *   - operations are explicit inner classes to untangle unwanted lambda effects
  51      *   - all operations have similar semantics
  52      *   - these use the qualifier duality:
  53      *         exists(P(x)) === !all(!P(x)) =>
  54      *         !exists(P(x)) === all(!P(x))
  55      */
  56 
  57     @Param("100000")
  58     private int size;
  59 
  60     private LongPredicate op;
  61 
  62     @Setup
  63     public void setup() {
  64         op = new LongPredicate() {
  65             @Override
  66             public boolean test(long v) {
  67                 return false;
  68             }
  69         };
  70     }
  71 
  72     @Benchmark
  73     public boolean seq_anyMatch() {
  74         return LongStream.range(0, size).noneMatch(op);
  75     }
  76 
  77     @Benchmark
  78     public boolean par_anyMatch() {
  79         return LongStream.range(0, size).parallel().noneMatch(op);
  80     }
  81 
  82 }