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 package org.mapdb;
 
 import org.junit.Test;
 
 import java.util.Map;
 
 import static org.junit.Assert.assertTrue;
 
 public class Issue157Test {
    @Test
    public void concurrent_BTreeMap() throws InterruptedException {
        DBMaker dbMaker = DBMaker.newMemoryDB().cacheDisable().asyncWriteDisable();
        DB db = dbMaker.make();
        final BTreeMap<IntegerStringmap = db.getTreeMap("COL_2");
        map.clear();
        Thread t1 = new Thread() {
            public void run() {
                for(int i=0; i<=10000; i++) {
                    map.put(i"foo");
                }
            }
        };
        Thread t2 = new Thread() {
            public void run() {
                for(int i=10000; i>=0; i--) {
                    map.put(i"bar");
                }
            }
        };
        t1.start();
        t2.start();
        t1.join();
        t2.join();
//        map.printTreeStructure();
        for(Map.Entry entry : map.entrySet()) {
//            System.out.println(entry.getKey() + " => " + entry.getValue());
            assertTrue(""+entry.getKey(),"bar".equals(entry.getValue())||"foo".equals(entry.getValue()));
        }
    }
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