Пример #1
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 public void LockConversionTest1()
 {
     MyLM target = new MyLM();
     target.setDeadlockTimeout(1000);
     Transaction context = new Transaction();
     Lockable resource = new RID(RID.Type.CAR, "test");
     target.LockForUpdate(context, resource);
     target.LockForWrite(context, resource);
 }
Пример #2
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        public void LM_DowngradeWriteLockToReadLock()
        {
            MyLM lm = new MyLM();
            RID res1 = new RID();

            Transaction t1 = new Transaction();

            lm.LockForWrite(t1, res1);
            lm.LockForRead(t1, res1);
        }
Пример #3
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        /// <summary>
        /// Default constructor.
        /// </summary>
        protected StorageManager()
        {
            this.activeContextMap   = new Dictionary <Transaction, StorageContext>();
            this.preparedContextMap = new StorageTransactionTable();
            this.pageManager        = new StoragePageManager();

            this.lockManager = new MyLM();

            this.disposed = false;
        }
Пример #4
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        public void LM_GetReadLockForManyTransactions()
        {
            MyLM lm = new MyLM();
            RID res1 = new RID();

            Transaction t1 = new Transaction();
            Transaction t2 = new Transaction();

            lm.LockForRead(t1, res1);
            lm.LockForRead(t2, res1);
        }
Пример #5
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        public void LM_GetWritelockOnResLockedWithWriteLock()
        {
            MyLM lm = new MyLM();
            RID res1 = new RID();

            Transaction t1 = new Transaction();
            Transaction t2 = new Transaction();

            lm.setDeadlockTimeout(500); // Shorten deadlock timeout to speed up unit test
            lm.LockForWrite(t1, res1);
            lm.LockForWrite(t2, res1);
        }
Пример #6
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 public void LockConversionTest2()
 {
     MyLM target = new MyLM();
     target.setDeadlockTimeout(1000);
     Transaction context = new Transaction();
     Transaction context2 = new Transaction();
     Lockable resource = new RID(RID.Type.CAR, "test");
     target.setDeadlockTimeout(10);
     target.LockForUpdate(context, resource);
     target.LockForRead(context2, resource);
     target.LockForWrite(context, resource);
     Assert.Fail("shall not reach this line");
 }
Пример #7
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 public void LockConversionTest3()
 {
     MyLM target = new MyLM();
     target.setDeadlockTimeout(1000);
     Transaction context = new Transaction();
     Transaction context2 = new Transaction();
     Lockable resource = new RID(RID.Type.CAR, "test");
     target.LockForUpdate(context, resource);
     target.LockForRead(context2, resource);
     ManualResetEvent e = new ManualResetEvent(false);
     ThreadPool.QueueUserWorkItem((obj) =>
     {
         Thread.Sleep(200);
         target.UnlockRead(context2, resource);
         e.Set();
     });
     target.LockForWrite(context, resource);
     if (!e.WaitOne(2000))
     {
         Assert.Fail("Failed");
     }
 }
Пример #8
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 public LM_Rid_Bundle(MyLM lm, RID rid)
 {
     this.lm = lm; this.rid = rid; status = 0; event1 = new AutoResetEvent(false);
 }
Пример #9
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        public void LM_UpgradeReadLockToWriteLock5()
        {
            MyLM lm = new MyLM();
            RID res1 = new RID();

            Transaction t1 = new Transaction();

            lm.LockForRead(t1, res1);
            lm.LockForWrite(t1, res1);
            lm.LockForWrite(t1, res1); // This should be a noop since the transaction already has a write lock on the resource.
        }
Пример #10
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        public void LM_UpgradeReadLockToWriteLock4()
        {
            MyLM lm = new MyLM();
            RID res1 = new RID();

            Transaction t1 = new Transaction();
            Transaction t2 = new Transaction();

            lm.setDeadlockTimeout(500); // Shorten deadlock timeout to speed up unit test
            lm.LockForWrite(t2, res1);
            lm.LockForWrite(t1, res1);
        }
Пример #11
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        public void LM_UpgradeReadLockToWriteLock2()
        {
            MyLM lm = new MyLM();
            RID res1 = new RID();

            Transaction t1 = new Transaction();

            LM_Rid_Bundle param = new LM_Rid_Bundle(lm, res1);

            Thread thread = new Thread(AttemptWriteLockOnResource);

            lm.setDeadlockTimeout(3000); // Shorten deadlock timeout to 3 seconds speed up unit test
            lm.LockForRead(t1, res1);
            thread.Start(param);
            Thread.Sleep(1000);
            lm.LockForWrite(t1, res1);
            thread.Join();
            // Make sure that the second thread failed with deadlock exception.
            // This should happen because the first thread is still holding either the read lock or write lock
            // when the second thread trys to acquire a write lock. The second thread won't be able to steal the
            // lock from the first thread because two phase locking was used when the LM upgrades the read lock
            // to a write lock.
            Assert.AreEqual(param.status, 1);
        }
Пример #12
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 public MyRM()
 {
     this._lockManager = new MyLM();
     _name             = "MyRM";
 }
Пример #13
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 public void UnlockWriteTest()
 {
     MyLM target = new MyLM();
     Transaction context = new Transaction();
     Transaction context2 = new Transaction();
     Lockable resource = new RID(RID.Type.CAR, "test");
     target.LockForWrite(context, resource);
     target.UnlockWrite(context, resource);
     target.LockForWrite(context2, resource);
 }
Пример #14
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 public void LockForReadTest2()
 {
     MyLM target = new MyLM();
     target.setDeadlockTimeout(1000);
     Transaction context = new Transaction();
     Transaction context2 = new Transaction();
     Lockable resource = new RID(RID.Type.CAR, "test");
     target.setDeadlockTimeout(10);
     target.LockForRead(context, resource);
     target.LockForWrite(context2, resource);
     target.LockForWrite(context2, resource);
 }
Пример #15
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 public MyRM()
 {
     this._lockManager = new MyLM();
     _name = "MyRM";
 }