package org.multiverse.stms.gamma.transactionalobjects.txnref;
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.transactionalobjects.GammaTxnRef;
import org.multiverse.stms.gamma.transactions.GammaTxn;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.fail;
import static org.multiverse.TestUtils.assertOrecValue;
import static org.multiverse.api.TxnThreadLocal.clearThreadLocalTxn;
import static org.multiverse.stms.gamma.GammaTestUtils.assertGlobalConflictCount;
import static org.multiverse.stms.gamma.GammaTestUtils.assertVersionAndValue;
import static org.multiverse.stms.gamma.GammaTestUtils.makeReadBiased;
public class GammaTxnRef_atomicGetTest {
private GammaStm stm;
@Before
public void setUp() {
stm = new GammaStm();
clearThreadLocalTxn();
}
// ==================== write biased ====================
@Test
public void writeBiased_whenReadLocked() {
String initialValue = "foo";
GammaTxnRef<String> ref = new GammaTxnRef<String>(stm, initialValue);
long initialVersion = ref.getVersion();
GammaTxn tx = stm.newDefaultTxn();
ref.getLock().acquire(tx, LockMode.Read);
long orecValue = ref.orec;
long conflictCount = stm.globalConflictCounter.count();
String result = ref.atomicGet();
assertSame(result, initialValue);
assertVersionAndValue(ref, initialVersion, initialValue);
assertOrecValue(ref, orecValue);
assertGlobalConflictCount(stm, conflictCount);
}
@Test
public void writeBiased_whenWriteLocked() {
String initialValue = "foo";
GammaTxnRef<String> ref = new GammaTxnRef<String>(stm, initialValue);
long initialVersion = ref.getVersion();
GammaTxn tx = stm.newDefaultTxn();
ref.getLock().acquire(tx, LockMode.Write);
long orecValue = ref.orec;
long conflictCount = stm.globalConflictCounter.count();
String result = ref.atomicGet();
assertSame(result, initialValue);
assertVersionAndValue(ref, initialVersion, initialValue);
assertOrecValue(ref, orecValue);
assertGlobalConflictCount(stm, conflictCount);
}
@Test
public void writeBiased_whenExclusiveLocked_thenLockedException() {
String initialValue = "foo";
GammaTxnRef<String> ref = new GammaTxnRef<String>(stm, initialValue);
long initialVersion = ref.getVersion();
GammaTxn tx = stm.newDefaultTxn();
ref.getLock().acquire(tx, LockMode.Exclusive);
long orecValue = ref.orec;
long conflictCount = stm.globalConflictCounter.count();
try {
ref.atomicGet();
fail();
} catch (LockedException expected) {
}
assertVersionAndValue(ref, initialVersion, initialValue);
assertOrecValue(ref, orecValue);
assertGlobalConflictCount(stm, conflictCount);
}
@Test
public void writeBiased_whenNull() {
GammaTxnRef<String> ref = new GammaTxnRef<String>(stm, null);
long initialVersion = ref.getVersion();
long conflictCount = stm.globalConflictCounter.count();
long orecValue = ref.orec;
String result = ref.atomicGet();
assertNull(result);
assertVersionAndValue(ref, initialVersion, null);
assertOrecValue(ref, orecValue);
assertGlobalConflictCount(stm, conflictCount);
}
@Test
public void writeBiased_whenNotNull() {
String initialValue = "foo";
GammaTxnRef<String> ref = new GammaTxnRef<String>(stm, initialValue);
long initialVersion = ref.getVersion();
long conflictCount = stm.globalConflictCounter.count();
long orecValue = ref.orec;
String result = ref.atomicGet();
assertSame(initialValue, result);
assertVersionAndValue(ref, initialVersion, initialValue);
assertOrecValue(ref, orecValue);
assertGlobalConflictCount(stm, conflictCount);
}
// ==================== read biased ====================
@Test
public void readBiased_whenReadLocked() {
String initialValue = "foo";
GammaTxnRef<String> ref = makeReadBiased(new GammaTxnRef<String>(stm, initialValue));
long initialVersion = ref.getVersion();
GammaTxn tx = stm.newDefaultTxn();
ref.getLock().acquire(tx, LockMode.Read);
long orecValue = ref.orec;
long conflictCount = stm.globalConflictCounter.count();
String result = ref.atomicGet();
assertSame(result, initialValue);
assertVersionAndValue(ref, initialVersion, initialValue);
assertOrecValue(ref, orecValue);
assertGlobalConflictCount(stm, conflictCount);
}
@Test
public void readBiased_whenWriteLocked() {
String initialValue = "foo";
GammaTxnRef<String> ref = makeReadBiased(new GammaTxnRef<String>(stm, initialValue));
long initialVersion = ref.getVersion();
GammaTxn tx = stm.newDefaultTxn();
ref.getLock().acquire(tx, LockMode.Write);
long orecValue = ref.orec;
long conflictCount = stm.globalConflictCounter.count();
String result = ref.atomicGet();
assertSame(result, initialValue);
assertVersionAndValue(ref, initialVersion, initialValue);
assertOrecValue(ref, orecValue);
assertGlobalConflictCount(stm, conflictCount);
}
@Test
public void readBiased_whenExclusiveLocked_thenLockedException() {
String initialValue = "foo";
GammaTxnRef<String> ref = makeReadBiased(new GammaTxnRef<String>(stm, initialValue));
long initialVersion = ref.getVersion();
GammaTxn tx = stm.newDefaultTxn();
ref.getLock().acquire(tx, LockMode.Exclusive);
long orecValue = ref.orec;
long conflictCount = stm.globalConflictCounter.count();
try {
ref.atomicGet();
fail();
} catch (LockedException expected) {
}
assertVersionAndValue(ref, initialVersion, initialValue);
assertOrecValue(ref, orecValue);
assertGlobalConflictCount(stm, conflictCount);
}
@Test
public void readBiased_whenNull() {
GammaTxnRef<String> ref = makeReadBiased(new GammaTxnRef<String>(stm, null));
long initialVersion = ref.getVersion();
long conflictCount = stm.globalConflictCounter.count();
long orecValue = ref.orec;
String result = ref.atomicGet();
assertNull(result);
assertVersionAndValue(ref, initialVersion, null);
assertOrecValue(ref, orecValue);
assertGlobalConflictCount(stm, conflictCount);
}
@Test
public void readBiased_whenNotNull() {
String initialValue = "foo";
GammaTxnRef<String> ref = makeReadBiased(new GammaTxnRef<String>(stm, initialValue));
long initialVersion = ref.getVersion();
long conflictCount = stm.globalConflictCounter.count();
long orecValue = ref.orec;
String result = ref.atomicGet();
assertSame(initialValue, result);
assertVersionAndValue(ref, initialVersion, initialValue);
assertOrecValue(ref, orecValue);
assertGlobalConflictCount(stm, conflictCount);
}
}