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