package org.multiverse.stms.gamma.transactionalobjects.txnlong;
import org.junit.Before;
import org.junit.Test;
import org.multiverse.api.LockMode;
import org.multiverse.api.exceptions.LockedException;
import org.multiverse.stms.gamma.GammaStm;
import org.multiverse.stms.gamma.GammaStmConfig;
import org.multiverse.stms.gamma.transactionalobjects.GammaTxnLong;
import org.multiverse.stms.gamma.transactions.GammaTxn;
import static org.junit.Assert.*;
import static org.multiverse.TestUtils.joinAll;
import static org.multiverse.TestUtils.sleepMs;
import static org.multiverse.api.TxnThreadLocal.clearThreadLocalTxn;
import static org.multiverse.api.TxnThreadLocal.setThreadLocalTxn;
import static org.multiverse.stms.gamma.GammaTestUtils.*;
public class GammaTxnLong_atomicCompareAndSetTest {
private GammaStm stm;
@Before
public void setUp() {
GammaStmConfig config = new GammaStmConfig();
config.maxRetries = 10;
stm = new GammaStm(config);
clearThreadLocalTxn();
}
@Test
public void whenPrivatizedByOther_thenLockedException() {
long initialValue = 1;
GammaTxnLong ref = new GammaTxnLong(stm, initialValue);
long initialVersion = ref.getVersion();
GammaTxn otherTx = stm.newDefaultTxn();
ref.getLock().acquire(otherTx, LockMode.Exclusive);
long newValue = 2;
try {
ref.atomicCompareAndSet(initialValue, newValue);
fail();
} catch (LockedException expected) {
}
assertSurplus(ref, 1);
assertRefHasExclusiveLock(ref, otherTx);
assertVersionAndValue(ref, initialVersion, initialValue);
}
@Test
public void whenEnsuredByOther_thenLockedException() {
long initialValue = 1;
GammaTxnLong ref = new GammaTxnLong(stm, initialValue);
long initialVersion = ref.getVersion();
GammaTxn otherTx = stm.newDefaultTxn();
ref.getLock().acquire(otherTx, LockMode.Write);
long newValue = 2;
try {
ref.atomicCompareAndSet(initialValue, newValue);
fail();
} catch (LockedException expected) {
}
assertSurplus(ref, 1);
assertRefHasWriteLock(ref, otherTx);
assertVersionAndValue(ref, initialVersion, initialValue);
}
@Test
public void whenActiveTransactionAvailable_thenIgnored() {
int initialValue = 1;
GammaTxnLong ref = new GammaTxnLong(stm, initialValue);
long initialVersion = ref.getVersion();
GammaTxn tx = stm.newDefaultTxn();
setThreadLocalTxn(tx);
ref.set(initialValue + 100);
long newValue = 2;
boolean result = ref.atomicCompareAndSet(initialValue, newValue);
assertTrue(result);
assertRefHasNoLocks(ref);
assertSurplus(ref, 0);
assertVersionAndValue(ref, initialVersion + 1, newValue);
}
@Test
public void whenExpectedValueFoundAndUpdateIsSame() {
long initialValue = 1;
GammaTxnLong ref = new GammaTxnLong(stm, initialValue);
long initialVersion = ref.getVersion();
boolean result = ref.atomicCompareAndSet(initialValue, initialValue);
assertTrue(result);
assertVersionAndValue(ref, initialVersion, initialValue);
assertRefHasNoLocks(ref);
assertSurplus(ref, 0);
}
@Test
public void whenExpectedValueFound() {
long initialValue = 1;
GammaTxnLong ref = new GammaTxnLong(stm, initialValue);
long initialVersion = ref.getVersion();
long newValue = initialValue + 1;
boolean result = ref.atomicCompareAndSet(initialValue, newValue);
assertTrue(result);
assertRefHasNoLocks(ref);
assertSurplus(ref, 0);
assertVersionAndValue(ref, initialVersion + 1, newValue);
}
@Test
public void whenExpectedValueNotFound() {
int initialValue = 2;
GammaTxnLong ref = new GammaTxnLong(stm, initialValue);
long initialVersion = ref.getVersion();
boolean result = ref.atomicCompareAndSet(1, 3);
assertFalse(result);
assertVersionAndValue(ref, initialVersion, initialValue);
assertRefHasNoLocks(ref);
assertSurplus(ref, 0);
}
@Test
public void whenListenersAvailable() {
long initialValue = 10;
GammaTxnLong ref = new GammaTxnLong(stm, initialValue);
long initialVersion = ref.getVersion();
long newValue = initialValue + 1;
TxnLongAwaitThread thread = new TxnLongAwaitThread(ref, newValue);
thread.start();
sleepMs(500);
ref.atomicCompareAndSet(initialValue, newValue);
joinAll(thread);
assertRefHasNoLocks(ref);
assertVersionAndValue(ref, initialVersion + 1, newValue);
}
}