jdk/test/java/util/LinkedHashMap/ComputeIfAbsentAccessOrder.java
author mduigou
Fri, 13 Dec 2013 13:35:35 -0800
changeset 22054 503bc3781dfe
permissions -rw-r--r--
8030016: HashMap.computeIfAbsent generates spurious access event Reviewed-by: psandoz, bchristi
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/*
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 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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/**
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 * @test
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 * @bug 8030016
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 * @summary computeIfAbsent would generate spurious access
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 */
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import java.util.*;
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public class ComputeIfAbsentAccessOrder {
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    public static void main(String args[]) throws Throwable {
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        LinkedHashMap<String,Object> map = new LinkedHashMap<>(2, 0.75f, true);
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        map.put("first", null);
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        map.put("second", null);
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        map.computeIfAbsent("first", l -> null); // should do nothing
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        String key = map.keySet().stream()
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                .findFirst()
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                .orElseThrow(() -> new RuntimeException("no value"));
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        if(!"first".equals(key)) {
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            throw new RuntimeException("not expected value " + "first" + "!=" + key);
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        }
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    }
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}