package org.multiverse.stms.gamma.transactionalobjects.orec;
import org.junit.Before;
import org.junit.Test;
import org.multiverse.api.exceptions.PanicError;
import org.multiverse.stms.gamma.GammaConstants;
import org.multiverse.stms.gamma.GammaStm;
import org.multiverse.stms.gamma.transactionalobjects.GammaTxnLong;
import static org.junit.Assert.*;
import static org.multiverse.TestUtils.assertOrecValue;
import static org.multiverse.stms.gamma.GammaTestUtils.*;
public class Orec_upgradeWriteLockTest implements GammaConstants {
private GammaStm stm;
@Before
public void setUp() {
stm = new GammaStm();
}
// ==================== write biased ================================
@Test
public void writeBiased_whenNotLocked_thenPanicError() {
GammaTxnLong orec = new GammaTxnLong(stm);
long orecValue = orec.orec;
try {
orec.upgradeWriteLock();
fail();
} catch (PanicError expected) {
}
assertOrecValue(orec, orecValue);
}
@Test
public void writeBiased_whenReadLocked_thenPanicError() {
GammaTxnLong orec = new GammaTxnLong(stm);
orec.arriveAndLock(1, LOCKMODE_READ);
long orecValue = orec.orec;
try {
orec.upgradeWriteLock();
fail();
} catch (PanicError expected) {
}
assertOrecValue(orec, orecValue);
}
@Test
public void writeBiased_whenWriteLockedAndNoSurplus() {
GammaTxnLong orec = new GammaTxnLong(stm);
orec.arriveAndLock(1, LOCKMODE_WRITE);
boolean result = orec.upgradeWriteLock();
assertFalse(result);
assertSurplus(orec, 1);
assertLockMode(orec, LOCKMODE_EXCLUSIVE);
assertWriteBiased(orec);
assertReadonlyCount(orec, 0);
}
@Test
public void writeBiased_whenWriteLockedAndSurplusOfReaders() {
GammaTxnLong orec = new GammaTxnLong(stm);
orec.arrive(1);
orec.arriveAndLock(1, LOCKMODE_WRITE);
boolean result = orec.upgradeWriteLock();
assertTrue(result);
assertSurplus(orec, 2);
assertLockMode(orec, LOCKMODE_EXCLUSIVE);
assertWriteBiased(orec);
assertReadonlyCount(orec, 0);
}
@Test
public void writeBiased_whenExclusiveLocked() {
GammaTxnLong orec = new GammaTxnLong(stm);
orec.arriveAndLock(1, LOCKMODE_EXCLUSIVE);
boolean result = orec.upgradeWriteLock();
assertFalse(result);
assertSurplus(orec, 1);
assertLockMode(orec, LOCKMODE_EXCLUSIVE);
assertWriteBiased(orec);
assertReadonlyCount(orec, 0);
}
// ==================== read biased ================================
@Test
public void readBiased_whenNotLocked_thenPanicError() {
GammaTxnLong orec = makeReadBiased(new GammaTxnLong(stm));
long orecValue = orec.orec;
try {
orec.upgradeWriteLock();
fail();
} catch (PanicError expected) {
}
assertOrecValue(orec, orecValue);
}
@Test
public void readBiased_whenReadLocked_thenPanicError() {
GammaTxnLong orec = makeReadBiased(new GammaTxnLong(stm));
orec.arriveAndLock(1, LOCKMODE_READ);
long orecValue = orec.orec;
try {
orec.upgradeWriteLock();
fail();
} catch (PanicError expected) {
}
assertOrecValue(orec, orecValue);
}
@Test
public void readBiased_whenWriteLockedAndNoSurplus() {
GammaTxnLong orec = makeReadBiased(new GammaTxnLong(stm));
orec.arriveAndLock(1, LOCKMODE_WRITE);
boolean result = orec.upgradeWriteLock();
assertTrue(result);
assertSurplus(orec, 1);
assertLockMode(orec, LOCKMODE_EXCLUSIVE);
assertReadBiased(orec);
assertReadonlyCount(orec, 0);
}
@Test
public void readBiased_whenWriteLockedAndSurplusOfReaders() {
GammaTxnLong orec = makeReadBiased(new GammaTxnLong(stm));
orec.arrive(1);
orec.arriveAndLock(1, LOCKMODE_WRITE);
boolean result = orec.upgradeWriteLock();
assertTrue(result);
assertSurplus(orec, 1);
assertLockMode(orec, LOCKMODE_EXCLUSIVE);
assertReadBiased(orec);
assertReadonlyCount(orec, 0);
}
@Test
public void readBiased_whenExclusiveLocked() {
GammaTxnLong orec = makeReadBiased(new GammaTxnLong(stm));
orec.arriveAndLock(1, LOCKMODE_EXCLUSIVE);
boolean result = orec.upgradeWriteLock();
assertFalse(result);
assertSurplus(orec, 1);
assertLockMode(orec, LOCKMODE_EXCLUSIVE);
assertReadBiased(orec);
assertReadonlyCount(orec, 0);
}
}