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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.transaction;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.fail;
import java.util.ArrayList;
import java.util.List;
/**
* @author bratseth
*/
public class NestedTransactionTestCase {
@Test
public void testNestedTransaction() {
NestedTransaction t = new NestedTransaction();
t.add(new TransactionTypeB("B1"), TransactionTypeC.class);
t.add(new TransactionTypeC("C1"));
t.add(new TransactionTypeA("A1"), TransactionTypeB.class);
t.add(new TransactionTypeA("A2"));
t.add(new TransactionTypeC("C2"));
// Add two tasks to run after commit
MutableInteger tasksRun = new MutableInteger();
t.onCommitted(() -> { tasksRun.value++; });
t.onCommitted(() -> { tasksRun.value++; });
assertEquals(3, t.transactions().size());
assertEquals(TransactionTypeA.class, t.transactions().get(0).getClass());
assertEquals(TransactionTypeB.class, t.transactions().get(1).getClass());
assertEquals(TransactionTypeC.class, t.transactions().get(2).getClass());
assertEquals("A1", ((MockOperation)t.transactions().get(0).operations().get(0)).name);
assertEquals("A2", ((MockOperation)t.transactions().get(0).operations().get(1)).name);
assertEquals("B1", ((MockOperation)t.transactions().get(1).operations().get(0)).name);
assertEquals("C1", ((MockOperation)t.transactions().get(2).operations().get(0)).name);
assertEquals("C2", ((MockOperation)t.transactions().get(2).operations().get(1)).name);
t.commit();
assertTrue(((MockTransaction)t.transactions().get(0)).committed);
assertTrue(((MockTransaction)t.transactions().get(1)).committed);
assertTrue(((MockTransaction)t.transactions().get(2)).committed);
assertEquals("After commit tasks are run", 2, tasksRun.value);
}
@Test
public void testNestedTransactionFailingOnCommit() {
NestedTransaction t = new NestedTransaction();
t.add(new TransactionTypeC("C1"));
t.add(new TransactionTypeA("A1"), TransactionTypeB.class, FailAtCommitTransactionType.class);
t.add(new TransactionTypeA("A2"));
t.add(new FailAtCommitTransactionType("Fail"), TransactionTypeC.class);
t.add(new TransactionTypeC("C2"));
t.add(new TransactionTypeB("B1"), TransactionTypeC.class, FailAtCommitTransactionType.class);
// Add task to run after commit
MutableInteger tasksRun = new MutableInteger();
t.onCommitted(() -> {
tasksRun.value++;
});
assertEquals(4, t.transactions().size());
assertEquals(TransactionTypeA.class, t.transactions().get(0).getClass());
assertEquals(TransactionTypeB.class, t.transactions().get(1).getClass());
assertEquals(FailAtCommitTransactionType.class, t.transactions().get(2).getClass());
assertEquals(TransactionTypeC.class, t.transactions().get(3).getClass());
try { t.commit(); } catch (IllegalStateException expected) { }
assertTrue(((MockTransaction)t.transactions().get(0)).rolledback);
assertTrue(((MockTransaction)t.transactions().get(1)).rolledback);
assertFalse(((MockTransaction) t.transactions().get(2)).committed);
assertEquals("After commit tasks are not run", 0, tasksRun.value);
}
@Test
public void testConflictingOrdering() {
NestedTransaction t = new NestedTransaction();
t.add(new TransactionTypeA("A1"), TransactionTypeB.class);
t.add(new TransactionTypeB("B1"), TransactionTypeC.class);
t.add(new TransactionTypeC("C1"), TransactionTypeA.class);
try {
t.commit();
fail("Expected exception");
}
catch (IllegalStateException expected) {
}
}
@Test
public void testMoreThanOneCommitThrows() {
NestedTransaction t = new NestedTransaction();
t.add(new TransactionTypeA("A1"), TransactionTypeB.class);
t.commit();
try {
t.commit();
fail("Expected exception");
}
catch (IllegalStateException expected) {
}
}
private static class TransactionTypeA extends MockTransaction {
public TransactionTypeA(String name) { super(name); }
}
private static class TransactionTypeB extends MockTransaction {
public TransactionTypeB(String name) { super(name); }
}
private static class TransactionTypeC extends MockTransaction {
public TransactionTypeC(String name) { super(name); }
}
private static class FailAtCommitTransactionType extends MockTransaction {
public FailAtCommitTransactionType(String name) { super(name); }
@Override
public void commit() {
throw new RuntimeException();
}
}
private static class MockTransaction extends AbstractTransaction {
public boolean prepared = false, committed = false, rolledback = false;
public MockTransaction(String name) {
add(new MockOperation(name));
}
@Override
public void prepare() {
prepared = true;
}
@Override
public void commit() {
if ( ! prepared)
throw new IllegalStateException("Commit before prepare");
committed = true;
}
@Override
public void rollbackOrLog() {
if ( ! committed)
throw new IllegalStateException("Rollback before commit");
rolledback = true;
}
}
private static class MockOperation implements Transaction.Operation {
public String name;
public MockOperation(String name) {
this.name = name;
}
}
private static class MutableInteger {
public int value = 0;
}
}
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