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27 lines (20 loc) · 891 Bytes
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package com.test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import java.util.concurrent.ConcurrentHashMap;
import org.junit.Test;
/**
* @author: jiayu.qiu
*/
public class BeanTest {
private static final ConcurrentHashMap<String, Boolean> PROCESSING=new ConcurrentHashMap<String, Boolean>();
@Test
public void testputIfAbsent() {
Boolean isProcessing=PROCESSING.putIfAbsent("k1", Boolean.TRUE);// 为发减少数据层的并发，增加等待机制。
assertNull(isProcessing);
System.out.println("isProcessing1==" + isProcessing);
isProcessing=PROCESSING.putIfAbsent("k1", Boolean.TRUE);// 为发减少数据层的并发，增加等待机制。
System.out.println("isProcessing2==" + isProcessing);
assertEquals(isProcessing, Boolean.TRUE);
}
}