use of org.h2.mvstore.MVStore in project h2database by h2database.
the class TestTransactionStore method testCompareWithPostgreSQL.
private void testCompareWithPostgreSQL() throws Exception {
ArrayList<Statement> statements = New.arrayList();
ArrayList<Transaction> transactions = New.arrayList();
ArrayList<TransactionMap<Integer, String>> maps = New.arrayList();
int connectionCount = 3, opCount = 1000, rowCount = 10;
try {
Class.forName("org.postgresql.Driver");
for (int i = 0; i < connectionCount; i++) {
Connection conn = DriverManager.getConnection("jdbc:postgresql:test?loggerLevel=OFF", "sa", "sa");
statements.add(conn.createStatement());
}
} catch (Exception e) {
// database not installed - ok
return;
}
statements.get(0).execute("drop table if exists test cascade");
statements.get(0).execute("create table test(id int primary key, name varchar(255))");
MVStore s = MVStore.open(null);
TransactionStore ts = new TransactionStore(s);
ts.init();
for (int i = 0; i < connectionCount; i++) {
Statement stat = statements.get(i);
// 100 ms to avoid blocking (the test is single threaded)
stat.execute("set statement_timeout to 100");
Connection c = stat.getConnection();
c.setTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED);
c.setAutoCommit(false);
Transaction transaction = ts.begin();
transactions.add(transaction);
TransactionMap<Integer, String> map;
map = transaction.openMap("test");
maps.add(map);
}
StringBuilder buff = new StringBuilder();
Random r = new Random(1);
try {
for (int i = 0; i < opCount; i++) {
int connIndex = r.nextInt(connectionCount);
Statement stat = statements.get(connIndex);
Transaction transaction = transactions.get(connIndex);
TransactionMap<Integer, String> map = maps.get(connIndex);
if (transaction == null) {
transaction = ts.begin();
map = transaction.openMap("test");
transactions.set(connIndex, transaction);
maps.set(connIndex, map);
// read all data, to get a snapshot
ResultSet rs = stat.executeQuery("select * from test order by id");
buff.append(i).append(": [" + connIndex + "]=");
int size = 0;
while (rs.next()) {
buff.append(' ');
int k = rs.getInt(1);
String v = rs.getString(2);
buff.append(k).append(':').append(v);
assertEquals(v, map.get(k));
size++;
}
buff.append('\n');
if (size != map.sizeAsLong()) {
assertEquals(size, map.sizeAsLong());
}
}
int x = r.nextInt(rowCount);
int y = r.nextInt(rowCount);
buff.append(i).append(": [" + connIndex + "]: ");
ResultSet rs = null;
switch(r.nextInt(7)) {
case 0:
buff.append("commit");
stat.getConnection().commit();
transaction.commit();
transactions.set(connIndex, null);
break;
case 1:
buff.append("rollback");
stat.getConnection().rollback();
transaction.rollback();
transactions.set(connIndex, null);
break;
case 2:
// insert or update
String old = map.get(x);
if (old == null) {
buff.append("insert " + x + "=" + y);
if (map.tryPut(x, "" + y)) {
stat.execute("insert into test values(" + x + ", '" + y + "')");
} else {
buff.append(" -> row was locked");
// the statement would time out in PostgreSQL
// TODO test sometimes if timeout occurs
}
} else {
buff.append("update " + x + "=" + y + " (old:" + old + ")");
if (map.tryPut(x, "" + y)) {
int c = stat.executeUpdate("update test set name = '" + y + "' where id = " + x);
assertEquals(1, c);
} else {
buff.append(" -> row was locked");
// the statement would time out in PostgreSQL
// TODO test sometimes if timeout occurs
}
}
break;
case 3:
buff.append("delete " + x);
try {
int c = stat.executeUpdate("delete from test where id = " + x);
if (c == 1) {
map.remove(x);
} else {
assertNull(map.get(x));
}
} catch (SQLException e) {
assertNotNull(map.get(x));
assertFalse(map.tryRemove(x));
// PostgreSQL needs to rollback
buff.append(" -> rollback");
stat.getConnection().rollback();
transaction.rollback();
transactions.set(connIndex, null);
}
break;
case 4:
case 5:
case 6:
rs = stat.executeQuery("select * from test where id = " + x);
String expected = rs.next() ? rs.getString(2) : null;
buff.append("select " + x + "=" + expected);
assertEquals("i:" + i, expected, map.get(x));
break;
}
buff.append('\n');
}
} catch (Exception e) {
e.printStackTrace();
fail(buff.toString());
}
for (Statement stat : statements) {
stat.getConnection().close();
}
ts.close();
s.close();
}
use of org.h2.mvstore.MVStore in project h2database by h2database.
the class TestTransactionStore method testTwoPhaseCommit.
private void testTwoPhaseCommit() {
String fileName = getBaseDir() + "/testTwoPhaseCommit.h3";
FileUtils.delete(fileName);
MVStore s;
TransactionStore ts;
Transaction tx;
Transaction txOld;
TransactionMap<String, String> m;
List<Transaction> list;
s = MVStore.open(fileName);
ts = new TransactionStore(s);
ts.init();
tx = ts.begin();
assertEquals(null, tx.getName());
tx.setName("first transaction");
assertEquals("first transaction", tx.getName());
assertEquals(1, tx.getId());
assertEquals(Transaction.STATUS_OPEN, tx.getStatus());
m = tx.openMap("test");
m.put("1", "Hello");
list = ts.getOpenTransactions();
assertEquals(1, list.size());
txOld = list.get(0);
assertTrue(tx.getId() == txOld.getId());
assertEquals("first transaction", txOld.getName());
s.commit();
ts.close();
s.close();
s = MVStore.open(fileName);
ts = new TransactionStore(s);
ts.init();
tx = ts.begin();
assertEquals(2, tx.getId());
m = tx.openMap("test");
assertEquals(null, m.get("1"));
m.put("2", "Hello");
list = ts.getOpenTransactions();
assertEquals(2, list.size());
txOld = list.get(0);
assertEquals(1, txOld.getId());
assertEquals(Transaction.STATUS_OPEN, txOld.getStatus());
assertEquals("first transaction", txOld.getName());
txOld.prepare();
assertEquals(Transaction.STATUS_PREPARED, txOld.getStatus());
txOld = list.get(1);
txOld.commit();
s.commit();
s.close();
s = MVStore.open(fileName);
ts = new TransactionStore(s);
ts.init();
tx = ts.begin();
m = tx.openMap("test");
m.put("3", "Test");
assertEquals(2, tx.getId());
list = ts.getOpenTransactions();
assertEquals(2, list.size());
txOld = list.get(1);
assertEquals(2, txOld.getId());
assertEquals(Transaction.STATUS_OPEN, txOld.getStatus());
assertEquals(null, txOld.getName());
txOld.rollback();
txOld = list.get(0);
assertEquals(1, txOld.getId());
assertEquals(Transaction.STATUS_PREPARED, txOld.getStatus());
assertEquals("first transaction", txOld.getName());
txOld.commit();
assertEquals("Hello", m.get("1"));
s.close();
FileUtils.delete(fileName);
}
use of org.h2.mvstore.MVStore 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();
}
use of org.h2.mvstore.MVStore 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();
}
use of org.h2.mvstore.MVStore 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();
}
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