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import junit.framework.*; |
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import java.util.*; |
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import java.util.concurrent.*; |
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import java.util.Enumeration; |
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import java.io.*; |
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import java.util.concurrent.ConcurrentHashMap; |
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public class ConcurrentHashMapTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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} |
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/** |
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* Create a map from Integers 1-5 to Strings "A"-"E". |
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* Returns a new map from Integers 1-5 to Strings "A"-"E". |
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*/ |
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private static ConcurrentHashMap map5() { |
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ConcurrentHashMap map = new ConcurrentHashMap(5); |
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public void testClear() { |
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ConcurrentHashMap map = map5(); |
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map.clear(); |
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assertEquals(map.size(), 0); |
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assertEquals(0, map.size()); |
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} |
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/** |
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* A deserialized map equals original |
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*/ |
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public void testSerialization() throws Exception { |
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ConcurrentHashMap q = map5(); |
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Map x = map5(); |
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Map y = serialClone(x); |
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ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
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ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
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out.writeObject(q); |
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out.close(); |
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ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
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ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
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ConcurrentHashMap r = (ConcurrentHashMap)in.readObject(); |
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assertEquals(q.size(), r.size()); |
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assertTrue(q.equals(r)); |
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assertTrue(r.equals(q)); |
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assertTrue(x != y); |
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assertEquals(x.size(), y.size()); |
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assertEquals(x, y); |
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assertEquals(y, x); |
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} |
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/** |
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map.put(new Integer(i), new Integer(i)); |
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assertFalse(map.isEmpty()); |
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Map.Entry entry1 = (Map.Entry)map.entrySet().iterator().next(); |
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|
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// assert that entry1 is not 16 |
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assertTrue("entry is 16, test not valid", |
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!entry1.getKey().equals(new Integer(16))); |
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// remove 16 (a different key) from map |
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// which just happens to cause entry1 to be cloned in map |
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map.remove(new Integer(16)); |
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entry1.setValue("XYZ"); |
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assertTrue(map.containsValue("XYZ")); // fails |
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// Unless it happens to be first (in which case remainder of |
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// test is skipped), remove a possibly-colliding key from map |
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// which, under some implementations, may cause entry1 to be |
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// cloned in map |
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if (!entry1.getKey().equals(new Integer(16))) { |
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map.remove(new Integer(16)); |
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entry1.setValue("XYZ"); |
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assertTrue(map.containsValue("XYZ")); // fails if write-through broken |
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} |
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} |
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} |
