private void testSavepoint() {
MVStore s = MVStore.open(null);
TransactionStore ts = new TransactionStore(s);
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();
}
private void testKeyIterator() {
MVStore s = MVStore.open(null);
TransactionStore ts = new TransactionStore(s);
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();
}
/** Roll the transaction back. Afterwards, this transaction is closed. */
public void rollback() {
if (status != STATUS_CLOSED) {
store.rollback(this, logId);
status = STATUS_CLOSED;
}
}
/** Commit the transaction. Afterwards, this transaction is closed. */
public void commit() {
if (status != STATUS_CLOSED) {
store.commit(this, logId);
status = STATUS_CLOSED;
}
}
/**
* Prepare the transaction. Afterwards, the transaction can only be committed or rolled back.
*/
public void prepare() {
checkOpen();
store.prepare(this);
status = STATUS_PREPARED;
}
/**
* Roll back to the given savepoint. This is only allowed if the transaction is open.
*
* @param savepointId the savepoint id
*/
public void rollbackToSavepoint(long savepointId) {
checkOpen();
store.rollbackTo(this, this.logId, savepointId);
this.logId = savepointId;
}
/**
* Add a log entry.
*
* @param opType the operation type
* @param mapId the map id
* @param key the key
* @param oldValue the old value
*/
void log(int opType, int mapId, Object key, Object oldValue) {
store.log(this, logId++, opType, mapId, key, oldValue);
}
/**
* Set the name of the transaction.
*
* @param name the new name
*/
public void setName(String name) {
checkOpen();
store.setTransactionName(this, name);
this.name = name;
}
private void testSingleConnection() {
MVStore s = MVStore.open(null);
TransactionStore ts = new TransactionStore(s);
Transaction tx;
TransactionMap<String, String> m;
// add, rollback
tx = ts.begin();
m = tx.openMap("test");
m.put("1", "Hello");
assertEquals("Hello", m.get("1"));
m.put("2", "World");
assertEquals("World", m.get("2"));
tx.rollback();
tx = ts.begin();
m = tx.openMap("test");
assertNull(m.get("1"));
assertNull(m.get("2"));
// add, commit
tx = ts.begin();
m = tx.openMap("test");
m.put("1", "Hello");
m.put("2", "World");
assertEquals("Hello", m.get("1"));
assertEquals("World", m.get("2"));
tx.commit();
tx = ts.begin();
m = tx.openMap("test");
assertEquals("Hello", m.get("1"));
assertEquals("World", m.get("2"));
// update+delete+insert, rollback
tx = ts.begin();
m = tx.openMap("test");
m.put("1", "Hallo");
m.remove("2");
m.put("3", "!");
assertEquals("Hallo", m.get("1"));
assertNull(m.get("2"));
assertEquals("!", m.get("3"));
tx.rollback();
tx = ts.begin();
m = tx.openMap("test");
assertEquals("Hello", m.get("1"));
assertEquals("World", m.get("2"));
assertNull(m.get("3"));
// update+delete+insert, commit
tx = ts.begin();
m = tx.openMap("test");
m.put("1", "Hallo");
m.remove("2");
m.put("3", "!");
assertEquals("Hallo", m.get("1"));
assertNull(m.get("2"));
assertEquals("!", m.get("3"));
tx.commit();
tx = ts.begin();
m = tx.openMap("test");
assertEquals("Hallo", m.get("1"));
assertNull(m.get("2"));
assertEquals("!", m.get("3"));
ts.close();
s.close();
}
private void testConcurrentTransactionsReadCommitted() {
MVStore s = MVStore.open(null);
TransactionStore ts = new TransactionStore(s);
Transaction tx1, tx2;
TransactionMap<String, String> m1, m2;
tx1 = ts.begin();
m1 = tx1.openMap("test");
m1.put("1", "Hi");
m1.put("3", ".");
tx1.commit();
tx1 = ts.begin();
m1 = tx1.openMap("test");
m1.put("1", "Hello");
m1.put("2", "World");
m1.remove("3");
tx1.commit();
// start new transaction to read old data
tx2 = ts.begin();
m2 = tx2.openMap("test");
// start transaction tx1, update/delete/add
tx1 = ts.begin();
m1 = tx1.openMap("test");
m1.put("1", "Hallo");
m1.remove("2");
m1.put("3", "!");
assertEquals("Hello", m2.get("1"));
assertEquals("World", m2.get("2"));
assertNull(m2.get("3"));
tx1.commit();
assertEquals("Hallo", m2.get("1"));
assertNull(m2.get("2"));
assertEquals("!", m2.get("3"));
tx1 = ts.begin();
m1 = tx1.openMap("test");
m1.put("2", "World");
assertNull(m2.get("2"));
assertFalse(m2.tryRemove("2"));
assertFalse(m2.tryPut("2", "Welt"));
tx2 = ts.begin();
m2 = tx2.openMap("test");
assertNull(m2.get("2"));
m1.remove("2");
assertNull(m2.get("2"));
tx1.commit();
tx1 = ts.begin();
m1 = tx1.openMap("test");
assertNull(m1.get("2"));
m1.put("2", "World");
m1.put("2", "Welt");
tx1.rollback();
tx1 = ts.begin();
m1 = tx1.openMap("test");
assertNull(m1.get("2"));
ts.close();
s.close();
}
private void testStopWhileCommitting() throws Exception {
String fileName = getBaseDir() + "/testStopWhileCommitting.h3";
FileUtils.delete(fileName);
Random r = new Random(0);
for (int i = 0; i < 10; ) {
MVStore s;
TransactionStore ts;
Transaction tx;
TransactionMap<Integer, String> m;
s = MVStore.open(fileName);
ts = new TransactionStore(s);
tx = ts.begin();
s.setReuseSpace(false);
m = tx.openMap("test");
final String value = "x" + i;
for (int j = 0; j < 1000; j++) {
m.put(j, value);
}
final AtomicInteger state = new AtomicInteger();
final MVStore store = s;
final MVMap<Integer, String> other = s.openMap("other");
Task task =
new Task() {
@Override
public void call() throws Exception {
for (int i = 0; !stop; i++) {
state.set(i);
other.put(i, value);
store.commit();
}
}
};
task.execute();
// wait for the task to start
while (state.get() < 1) {
Thread.yield();
}
// commit while writing in the task
tx.commit();
// wait for the task to stop
task.get();
store.close();
s = MVStore.open(fileName);
// roll back a bit, until we have some undo log entries
assertTrue(s.hasMap("undoLog"));
for (int back = 0; back < 100; back++) {
int minus = r.nextInt(10);
s.rollbackTo(Math.max(0, s.getCurrentVersion() - minus));
MVMap<?, ?> undo = s.openMap("undoLog");
if (undo.size() > 0) {
break;
}
}
ts = new TransactionStore(s);
List<Transaction> list = ts.getOpenTransactions();
if (list.size() != 0) {
tx = list.get(0);
if (tx.getStatus() == Transaction.STATUS_COMMITTING) {
i++;
}
}
s.close();
FileUtils.delete(fileName);
assertFalse(FileUtils.exists(fileName));
}
}
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", "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);
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) {
assertTrue(map.get(x) != null);
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();
}
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);
tx = ts.begin();
assertEquals(null, tx.getName());
tx.setName("first transaction");
assertEquals("first transaction", tx.getName());
assertEquals(0, 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());
s.commit();
ts.close();
s.close();
s = MVStore.open(fileName);
ts = new TransactionStore(s);
tx = ts.begin();
assertEquals(1, 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(0, txOld.getId());
assertEquals(Transaction.STATUS_OPEN, txOld.getStatus());
assertEquals("first transaction", txOld.getName());
txOld.prepare();
assertEquals(Transaction.STATUS_PREPARED, txOld.getStatus());
s.commit();
s.close();
s = MVStore.open(fileName);
ts = new TransactionStore(s);
tx = ts.begin();
m = tx.openMap("test");
// TransactionStore was not closed, so we lost some ids
assertEquals(65, tx.getId());
list = ts.getOpenTransactions();
assertEquals(2, list.size());
txOld = list.get(1);
assertEquals(1, txOld.getId());
assertEquals(Transaction.STATUS_OPEN, txOld.getStatus());
assertEquals(null, txOld.getName());
txOld.rollback();
txOld = list.get(0);
assertEquals(0, 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);
}
/**
* Tests behavior when used for a sequence of SQL statements. Each statement uses a savepoint.
* Within a statement, changes by the statement itself are not seen; the change is only seen when
* the statement finished.
*
* <p>Update statements that change the key of multiple rows may use delete/add pairs to do so
* (they don't need to first delete all entries and then re-add them). Trying to add multiple
* values for the same key is not allowed (an update statement that would result in a duplicate
* key).
*/
private void testMultiStatement() {
MVStore s = MVStore.open(null);
TransactionStore ts = new TransactionStore(s);
Transaction tx;
TransactionMap<String, String> m;
long startUpdate;
tx = ts.begin();
// start of statement
// create table test
startUpdate = tx.setSavepoint();
m = tx.openMap("test");
m.setSavepoint(startUpdate);
// start of statement
// insert into test(id, name) values(1, 'Hello'), (2, 'World')
startUpdate = tx.setSavepoint();
m.setSavepoint(startUpdate);
assertTrue(m.trySet("1", "Hello", true));
assertTrue(m.trySet("2", "World", true));
// not seen yet (within the same statement)
assertNull(m.get("1"));
assertNull(m.get("2"));
// start of statement
startUpdate = tx.setSavepoint();
// now we see the newest version
m.setSavepoint(startUpdate);
assertEquals("Hello", m.get("1"));
assertEquals("World", m.get("2"));
// update test set primaryKey = primaryKey + 1
// (this is usually a tricky case)
assertEquals("Hello", m.get("1"));
assertTrue(m.trySet("1", null, true));
assertTrue(m.trySet("2", "Hello", true));
assertEquals("World", m.get("2"));
// already updated by this statement, so it has no effect
// but still returns true because it was changed by this transaction
assertTrue(m.trySet("2", null, true));
assertTrue(m.trySet("3", "World", true));
// not seen within this statement
assertEquals("Hello", m.get("1"));
assertEquals("World", m.get("2"));
assertNull(m.get("3"));
// start of statement
startUpdate = tx.setSavepoint();
m.setSavepoint(startUpdate);
// select * from test
assertNull(m.get("1"));
assertEquals("Hello", m.get("2"));
assertEquals("World", m.get("3"));
// start of statement
startUpdate = tx.setSavepoint();
m.setSavepoint(startUpdate);
// update test set id = 1
// should fail: duplicate key
assertTrue(m.trySet("2", null, true));
assertTrue(m.trySet("1", "Hello", true));
assertTrue(m.trySet("3", null, true));
assertFalse(m.trySet("1", "World", true));
tx.rollbackToSavepoint(startUpdate);
startUpdate = tx.setSavepoint();
m.setSavepoint(startUpdate);
assertNull(m.get("1"));
assertEquals("Hello", m.get("2"));
assertEquals("World", m.get("3"));
tx.commit();
ts.close();
s.close();
}
private void testGetModifiedMaps() {
MVStore s = MVStore.open(null);
TransactionStore ts = new TransactionStore(s);
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();
}
