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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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import junit.framework.*; |
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public class ThreadLocalTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
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junit.textui.TestRunner.run(suite()); |
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} |
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public static Test suite() { |
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return new TestSuite(ThreadLocalTest.class); |
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} |
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static ThreadLocal tl = new ThreadLocal() { |
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public Object initialValue() { |
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return new Integer(1); |
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static ThreadLocal<Integer> tl = new ThreadLocal<Integer>() { |
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public Integer initialValue() { |
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return one; |
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} |
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}; |
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> |
|
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> |
static InheritableThreadLocal<Integer> itl = |
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new InheritableThreadLocal<Integer>() { |
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> |
protected Integer initialValue() { |
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return zero; |
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} |
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> |
|
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> |
protected Integer childValue(Integer parentValue) { |
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return new Integer(parentValue.intValue() + 1); |
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} |
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}; |
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|
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– |
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/** |
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* remove causes next access to return initial value |
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*/ |
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public void testRemove() { |
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Integer one = new Integer(1); |
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Integer two = new Integer(2); |
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assertEquals(tl.get(), one); |
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tl.set(two); |
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assertEquals(tl.get(), two); |
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tl.remove(); |
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assertEquals(tl.get(), one); |
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} |
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– |
} |
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|
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+ |
/** |
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* remove in InheritableThreadLocal causes next access to return |
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* initial value |
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*/ |
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public void testRemoveITL() { |
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assertEquals(itl.get(), zero); |
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itl.set(two); |
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assertEquals(itl.get(), two); |
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itl.remove(); |
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assertEquals(itl.get(), zero); |
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} |
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|
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private class ITLThread extends Thread { |
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final int[] x; |
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ITLThread(int[] array) { x = array; } |
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public void run() { |
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Thread child = null; |
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if (itl.get().intValue() < x.length - 1) { |
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child = new ITLThread(x); |
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child.start(); |
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} |
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Thread.currentThread().yield(); |
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|
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int threadId = itl.get().intValue(); |
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for (int j = 0; j < threadId; j++) { |
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x[threadId]++; |
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Thread.currentThread().yield(); |
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} |
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|
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if (child != null) { // Wait for child (if any) |
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try { |
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child.join(); |
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} catch (InterruptedException e) { |
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threadUnexpectedException(e); |
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} |
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} |
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} |
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} |
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|
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/** |
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* InheritableThreadLocal propagates generic values. |
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*/ |
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public void testGenericITL() { |
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final int threadCount = 10; |
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final int x[] = new int[threadCount]; |
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Thread progenitor = new ITLThread(x); |
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try { |
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progenitor.start(); |
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progenitor.join(); |
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for (int i = 0; i < threadCount; i++) { |
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assertEquals(i, x[i]); |
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} |
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} catch (InterruptedException e) { |
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unexpectedException(e); |
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} |
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} |
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} |
