126 lines
4.2 KiB
Java
126 lines
4.2 KiB
Java
/*
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* Copyright (c) 2012, 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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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.function.Supplier;
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import org.testng.annotations.Test;
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import static org.testng.Assert.*;
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/**
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* @test
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* @run testng ThreadLocalSupplierTest
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* @summary tests ThreadLocal.withInitial(<Supplier>).
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* Adapted from java.lang.Basic functional test of ThreadLocal
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*
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* @author Jim Gish <jim.gish@oracle.com>
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*/
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@Test
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public class ThreadLocalSupplierTest {
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static final class IntegerSupplier implements Supplier<Integer> {
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private final AtomicInteger supply = new AtomicInteger(0);
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@Override
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public Integer get() {
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return supply.getAndIncrement();
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}
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public int numCalls() {
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return supply.intValue();
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}
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}
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static IntegerSupplier theSupply = new IntegerSupplier();
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static final class MyThreadLocal extends ThreadLocal<Integer> {
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private final ThreadLocal<Integer> delegate;
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public volatile boolean everCalled;
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public MyThreadLocal(Supplier<Integer> supplier) {
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delegate = ThreadLocal.<Integer>withInitial(supplier);
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}
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@Override
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public Integer get() {
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return delegate.get();
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}
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@Override
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protected synchronized Integer initialValue() {
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// this should never be called since we are using the factory instead
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everCalled = true;
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return null;
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}
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}
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/**
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* Our one and only ThreadLocal from which we get thread ids using a
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* supplier which simply increments a counter on each call of get().
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*/
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static MyThreadLocal threadLocal = new MyThreadLocal(theSupply);
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public void testMultiThread() throws Exception {
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final int threadCount = 500;
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final Thread th[] = new Thread[threadCount];
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final boolean visited[] = new boolean[threadCount];
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// Create and start the threads
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for (int i = 0; i < threadCount; i++) {
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th[i] = new Thread() {
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@Override
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public void run() {
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final int threadId = threadLocal.get();
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assertFalse(visited[threadId], "visited[" + threadId + "]=" + visited[threadId]);
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visited[threadId] = true;
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// check the get() again
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final int secondCheckThreadId = threadLocal.get();
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assertEquals(secondCheckThreadId, threadId);
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}
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};
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th[i].start();
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}
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// Wait for the threads to finish
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for (int i = 0; i < threadCount; i++) {
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th[i].join();
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}
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assertEquals(theSupply.numCalls(), threadCount);
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// make sure the provided initialValue() has not been called
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assertFalse(threadLocal.everCalled);
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// Check results
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for (int i = 0; i < threadCount; i++) {
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assertTrue(visited[i], "visited[" + i + "]=" + visited[i]);
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}
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}
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public void testSimple() {
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final String expected = "OneWithEverything";
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final ThreadLocal<String> threadLocal = ThreadLocal.<String>withInitial(() -> expected);
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assertEquals(expected, threadLocal.get());
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}
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}
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