Examples with TransactionStore org.h2.mvstore.db.TransactionStore used on opensource projects

Example 16 with TransactionStore

use of org.h2.mvstore.db.TransactionStore in project h2database by h2database.

the class TestTransactionStore method testKeyIterator.

private void testKeyIterator() {
    MVStore s = MVStore.open(null);
    TransactionStore ts = new TransactionStore(s);
    ts.init();
    Transaction tx, tx2;
    TransactionMap<String, String> m, m2;
    Iterator<String> it, it2;
    tx = ts.begin();
    m = tx.openMap("test");
    m.put("1", "Hello");
    m.put("2", "World");
    m.put("3", ".");
    tx.commit();
    tx2 = ts.begin();
    m2 = tx2.openMap("test");
    m2.remove("2");
    m2.put("3", "!");
    m2.put("4", "?");
    tx = ts.begin();
    m = tx.openMap("test");
    it = m.keyIterator(null);
    assertTrue(it.hasNext());
    assertEquals("1", it.next());
    assertTrue(it.hasNext());
    assertEquals("2", it.next());
    assertTrue(it.hasNext());
    assertEquals("3", it.next());
    assertFalse(it.hasNext());
    it2 = m2.keyIterator(null);
    assertTrue(it2.hasNext());
    assertEquals("1", it2.next());
    assertTrue(it2.hasNext());
    assertEquals("3", it2.next());
    assertTrue(it2.hasNext());
    assertEquals("4", it2.next());
    assertFalse(it2.hasNext());
    s.close();
}

Example 17 with TransactionStore

use of org.h2.mvstore.db.TransactionStore in project h2database by h2database.

the class TestTransactionStore method testSavepoint.

private void testSavepoint() {
    MVStore s = MVStore.open(null);
    TransactionStore ts = new TransactionStore(s);
    ts.init();
    Transaction tx;
    TransactionMap<String, String> m;
    tx = ts.begin();
    m = tx.openMap("test");
    m.put("1", "Hello");
    m.put("2", "World");
    m.put("1", "Hallo");
    m.remove("2");
    m.put("3", "!");
    long logId = tx.setSavepoint();
    m.put("1", "Hi");
    m.put("2", ".");
    m.remove("3");
    tx.rollbackToSavepoint(logId);
    assertEquals("Hallo", m.get("1"));
    assertNull(m.get("2"));
    assertEquals("!", m.get("3"));
    tx.rollback();
    tx = ts.begin();
    m = tx.openMap("test");
    assertNull(m.get("1"));
    assertNull(m.get("2"));
    assertNull(m.get("3"));
    ts.close();
    s.close();
}

Example 18 with TransactionStore

use of org.h2.mvstore.db.TransactionStore in project h2database by h2database.

the class TestTransactionStore method testStoreMultiThreadedReads.

private static void testStoreMultiThreadedReads() throws Exception {
    MVStore s = MVStore.open(null);
    final TransactionStore ts = new TransactionStore(s);
    ts.init();
    Transaction t = ts.begin();
    TransactionMap<Integer, Integer> mapA = t.openMap("a");
    mapA.put(1, 0);
    t.commit();
    Task task = new Task() {

        @Override
        public void call() throws Exception {
            for (int i = 0; !stop; i++) {
                Transaction tx = ts.begin();
                TransactionMap<Integer, Integer> mapA = tx.openMap("a");
                while (!mapA.tryPut(1, i)) {
                // repeat
                }
                tx.commit();
                // map B transaction
                // the other thread will get a map A uncommitted value,
                // but by the time it tries to walk back to the committed
                // value, the undoLog has changed
                tx = ts.begin();
                TransactionMap<Integer, Integer> mapB = tx.openMap("b");
                // put a new value to the map; this will cause a map B
                // undoLog entry to be created with a null pre-image value
                mapB.tryPut(i, -i);
                // this is where the real race condition occurs:
                // some other thread might get the B log entry
                // for this transaction rather than the uncommitted A log
                // entry it is expecting
                tx.commit();
            }
        }
    };
    task.execute();
    try {
        for (int i = 0; i < 10000; i++) {
            Transaction tx = ts.begin();
            mapA = tx.openMap("a");
            if (mapA.get(1) == null) {
                throw new AssertionError("key not found");
            }
            tx.commit();
        }
    } finally {
        task.get();
    }
    ts.close();
}

Example 19 with TransactionStore

use of org.h2.mvstore.db.TransactionStore in project h2database by h2database.

the class TestTransactionStore method testGetModifiedMaps.

private void testGetModifiedMaps() {
    MVStore s = MVStore.open(null);
    TransactionStore ts = new TransactionStore(s);
    ts.init();
    Transaction tx;
    TransactionMap<String, String> m1, m2, m3;
    long sp;
    tx = ts.begin();
    m1 = tx.openMap("m1");
    m2 = tx.openMap("m2");
    m3 = tx.openMap("m3");
    assertFalse(tx.getChanges(0).hasNext());
    tx.commit();
    tx = ts.begin();
    m1 = tx.openMap("m1");
    m2 = tx.openMap("m2");
    m3 = tx.openMap("m3");
    m1.put("1", "100");
    sp = tx.setSavepoint();
    m2.put("1", "100");
    m3.put("1", "100");
    Iterator<Change> it = tx.getChanges(sp);
    assertTrue(it.hasNext());
    Change c;
    c = it.next();
    assertEquals("m3", c.mapName);
    assertEquals("1", c.key.toString());
    assertNull(c.value);
    assertTrue(it.hasNext());
    c = it.next();
    assertEquals("m2", c.mapName);
    assertEquals("1", c.key.toString());
    assertNull(c.value);
    assertFalse(it.hasNext());
    it = tx.getChanges(0);
    assertTrue(it.hasNext());
    c = it.next();
    assertEquals("m3", c.mapName);
    assertEquals("1", c.key.toString());
    assertNull(c.value);
    assertTrue(it.hasNext());
    c = it.next();
    assertEquals("m2", c.mapName);
    assertEquals("1", c.key.toString());
    assertNull(c.value);
    assertTrue(it.hasNext());
    c = it.next();
    assertEquals("m1", c.mapName);
    assertEquals("1", c.key.toString());
    assertNull(c.value);
    assertFalse(it.hasNext());
    tx.rollbackToSavepoint(sp);
    it = tx.getChanges(0);
    assertTrue(it.hasNext());
    c = it.next();
    assertEquals("m1", c.mapName);
    assertEquals("1", c.key.toString());
    assertNull(c.value);
    assertFalse(it.hasNext());
    tx.commit();
    s.close();
}