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fix ConcurrentMapTests failed test (#1070) 

* add concurrentmap tests

* fix ConcurrentMapTests#givenConcurrentMap_whenKeyWithSameHashCode_thenPerformanceDegrades
This commit is contained in:
Tian Baoqiang 2017-01-29 21:32:10 +08:00 committed by Grzegorz Piwowarek
parent b852e2edcc
commit c565173601
1 changed files with 3 additions and 4 deletions
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7
core-java/src/test/java/com/baeldung/java/concurrentmap/ConcurrentMapPerformanceTest.java
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@ -9,7 +9,6 @@ import java.util.Map;
import java.util.concurrent.*;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;
public class ConcurrentMapPerformanceTest {
@ -24,11 +23,11 @@ public class ConcurrentMapPerformanceTest {
long syncHashMapAvgRuntime = timeElapseForGetPut(synchronizedHashMap);
long concurrentHashMapAvgRuntime = timeElapseForGetPut(concurrentHashMap);
System.out.println(String.format("Hashtable: %s, syncHashMap: %s, ConcurrentHashMap: %s", hashtableAvgRuntime, syncHashMapAvgRuntime, concurrentHashMapAvgRuntime));
assertTrue(hashtableAvgRuntime > concurrentHashMapAvgRuntime);
assertTrue(syncHashMapAvgRuntime > concurrentHashMapAvgRuntime);
System.out.println(String.format("Hashtable: %s, syncHashMap: %s, ConcurrentHashMap: %s", hashtableAvgRuntime, syncHashMapAvgRuntime, concurrentHashMapAvgRuntime));
}
private long timeElapseForGetPut(Map<String, Object> map) throws InterruptedException {
@ -90,7 +89,7 @@ public class ConcurrentMapPerformanceTest {
long mapOfDefaultHashDuration = System.currentTimeMillis() - defaultHashStartTime;
assertEquals(executeTimes * 2, mapOfDefaultHash.size());
assertNotEquals(executeTimes * 2, mapOfSameHash.size());
assertEquals(executeTimes * 2, mapOfSameHash.size());
System.out.println(String.format("same-hash: %s, default-hash: %s", mapOfSameHashDuration, mapOfDefaultHashDuration));
assertTrue("same hashCode() should greatly degrade performance", mapOfSameHashDuration > mapOfDefaultHashDuration * 10);
}