1 /*
   2  * Copyright (c) 2012, 2013, 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.tests.java.util.stream;
  24 
  25 import java.util.Comparators;
  26 import java.util.stream.LambdaTestHelpers;
  27 import java.util.stream.OpTestCase;
  28 import java.util.stream.StreamTestDataProvider;
  29 import org.testng.annotations.Test;
  30 
  31 import java.util.Iterator;
  32 import java.util.Comparator;
  33 import java.util.concurrent.atomic.AtomicInteger;
  34 import java.util.function.Function;
  35 import java.util.function.Supplier;
  36 import java.util.function.UnaryOperator;
  37 import java.util.Spliterator;
  38 import java.util.stream.Stream;
  39 import java.util.stream.TestData;
  40 
  41 import static org.testng.Assert.assertEquals;
  42 import static org.testng.Assert.assertTrue;
  43 
  44 /**
  45  * SequentialOpTest
  46  *
  47  * @author Brian Goetz
  48  */
  49 public class SequentialOpTest extends OpTestCase {
  50     @SuppressWarnings({"rawtypes", "unchecked"})
  51     @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class,
  52           groups = { "serialization-hostile" })
  53     public void testLazy(String name, TestData.OfRef<Integer> data) {
  54         Function<Integer, Integer> id = LambdaTestHelpers.identity();
  55         AtomicInteger counter = new AtomicInteger();
  56         Supplier<Stream<Integer>>[] suppliers = new Supplier[] { () -> data.stream(), () -> data.parallelStream() };
  57         UnaryOperator<Stream<Integer>>[] configs
  58                 = new UnaryOperator[] {
  59                     (UnaryOperator<Stream<Integer>>) s -> s.peek(e -> { counter.incrementAndGet(); }),
  60                     (UnaryOperator<Stream<Integer>>) s -> s.map(id).peek(e -> { counter.incrementAndGet(); }).sequential().map(id),
  61                     (UnaryOperator<Stream<Integer>>) s -> s.map(id).peek(e -> { counter.incrementAndGet(); }).parallel().map(id),
  62                     (UnaryOperator<Stream<Integer>>) s -> s.sequential().map(id).peek(e -> {
  63                         counter.incrementAndGet();
  64                     }).map(id),
  65                     (UnaryOperator<Stream<Integer>>) s -> s.parallel().map(id).peek(e -> { counter.incrementAndGet(); }).map(id)
  66         };
  67 
  68         for (int i = 0; i < suppliers.length; i++) {
  69             setContext("supplierIndex", i);
  70             Supplier<Stream<Integer>> supp = suppliers[i];
  71             for (int j = 0; j < configs.length; j++) {
  72                 setContext("configIndex", j);
  73                 UnaryOperator<Stream<Integer>> config = configs[j];
  74                 counter.set(0);
  75                 Stream<Integer> stream = config.apply(supp.get());
  76                 assertEquals(0, counter.get());
  77 
  78                 Iterator<Integer> iterator = stream.iterator();
  79                 assertEquals(0, counter.get());
  80 
  81                 if (iterator.hasNext())
  82                     iterator.next();
  83                 assertTrue(data.size() == 0 || counter.get() > 0);
  84 
  85                 counter.set(0);
  86                 stream = config.apply(supp.get());
  87                 Spliterator<Integer> spliterator = stream.spliterator();
  88                 assertEquals(0, counter.get());
  89 
  90                 spliterator.forEachRemaining(e -> {
  91                 });
  92                 assertTrue(data.size() == 0 || counter.get() > 0);
  93             }
  94         }
  95     }
  96 
  97     @SuppressWarnings({"rawtypes", "unchecked"})
  98     @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
  99     public void testMixedSeqPar(String name, TestData.OfRef<Integer> data) {
 100         Function<Integer, Integer> id = LambdaTestHelpers.identity();
 101         UnaryOperator<Stream<Integer>>[] changers
 102                 = new UnaryOperator[] {
 103                 (UnaryOperator<Stream<Integer>>) s -> s,
 104                 (UnaryOperator<Stream<Integer>>) s -> s.sequential(),
 105                 (UnaryOperator<Stream<Integer>>) s -> s.parallel(),
 106                 (UnaryOperator<Stream<Integer>>) s -> s.unordered()
 107         };
 108         UnaryOperator<Stream<Integer>>[] stuff
 109                 = new UnaryOperator[] {
 110                 (UnaryOperator<Stream<Integer>>) s -> s,
 111                 (UnaryOperator<Stream<Integer>>) s -> s.map(id),
 112                 (UnaryOperator<Stream<Integer>>) s -> s.sorted(Comparators.naturalOrder()),
 113                 (UnaryOperator<Stream<Integer>>) s -> s.map(id).sorted(Comparators.naturalOrder()).map(id),
 114                 (UnaryOperator<Stream<Integer>>) s -> s.filter(LambdaTestHelpers.pEven).sorted(Comparators.naturalOrder()).map(id),
 115         };
 116 
 117         for (int c1Index = 0; c1Index < changers.length; c1Index++) {
 118             setContext("c1Index", c1Index);
 119             UnaryOperator<Stream<Integer>> c1 = changers[c1Index];
 120             for (int s1Index = 0; s1Index < stuff.length; s1Index++) {
 121                 setContext("s1Index", s1Index);
 122                 UnaryOperator<Stream<Integer>> s1 = stuff[s1Index];
 123                 for (int c2Index = 0; c2Index < changers.length; c2Index++) {
 124                     setContext("c2Index", c2Index);
 125                     UnaryOperator<Stream<Integer>> c2 = changers[c2Index];
 126                     for (int s2Index = 0; s2Index < stuff.length; s2Index++) {
 127                         setContext("s2Index", s2Index);
 128                         UnaryOperator<Stream<Integer>> s2 = stuff[s2Index];
 129                         UnaryOperator<Stream<Integer>> composed = s -> s2.apply(c2.apply(s1.apply(c1.apply(s))));
 130                         exerciseOps(data, composed);
 131                     }
 132                 }
 133             }
 134         }
 135     }
 136 }