Interface TxnDouble

  • All Superinterfaces:
    TxnObject
    All Known Implementing Classes:
    GammaTxnDouble

    public interface TxnDouble
    extends TxnObject
    A Transactional Reference comparable to the Clojure Ref. If a method is prefixed with atomic, the call will always run under its own txn, no matter if there already is a txn available (so the propagation level is PropagationLevel.RequiresNew). For the other methods, always an txn needs to be available, else you will get the TxnMandatoryException.

    ControlFlowError

    All non atomic methods are able to throw a (subclass) of the ControlFlowError. This error should not be caught, it is task of the TxnExecutor to deal with.

    TransactionExecutionException

    Most of the methods can throw a TxnExecutionException. This exception can be caught, but in most cases you want to figure out what the cause is (e.g. because there are too many retries) and solve that problem.

    Threadsafe

    All methods are threadsafe.

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      double alterAndGet​(DoubleFunction function)
      Alters the value stored in this Ref using the provided function and returns the result.
      double alterAndGet​(Txn txn, DoubleFunction function)
      Alters the value stored in this Ref using the provided function and lifting on the provided txn.
      double atomicAlterAndGet​(DoubleFunction function)
      Atomically applies the function to the current value in this ref and returns the new value.
      boolean atomicCompareAndSet​(double expectedValue, double newValue)
      Executes a compare and set atomically.
      double atomicGet()
      Atomically gets the value.
      double atomicGetAndAlter​(DoubleFunction function)
      Atomically applies the function to alter the value stored in this ref and returns the old value.
      double atomicGetAndIncrement​(double amount)
      Atomically increments the value and returns the old value.
      double atomicGetAndSet​(double newValue)
      Atomically sets the value and returns the previous value.
      double atomicIncrementAndGet​(double amount)
      Atomically increments the value and returns the old value.
      double atomicSet​(double newValue)
      Atomically sets the value and returns the new value.
      double atomicWeakGet()
      Atomically gets the value without providing any ordering guarantees.
      void await​(double value)
      Awaits for the value to become the given value.
      void await​(DoublePredicate predicate)
      Awaits until the predicate holds.
      void await​(Txn txn, double value)
      Awaits for the reference to become the given value.
      void await​(Txn txn, DoublePredicate predicate)
      Awaits until the predicate holds using the provided txn.
      void commute​(DoubleFunction function)
      Applies the function on the ref in a commuting manner.
      void commute​(Txn txn, DoubleFunction function)
      Applies the function on the ref in a commuting manner.
      double get()
      Gets the value using the provided txn.
      double get​(Txn txn)
      Gets the value using the provided txn.
      double getAndAlter​(DoubleFunction function)
      Alters the value stored in this Ref using the provided function amd returns the old value.
      double getAndAlter​(Txn txn, DoubleFunction function)
      Alters the value stored in this Ref using the function and returns the old value, using the provided txn.
      double getAndIncrement​(double amount)
      Increments the value and returns the old value.
      double getAndIncrement​(Txn txn, double amount)
      Increments the value and returns the old value using the provided txn.
      double getAndLock​(LockMode lockMode)
      Gets the value and applies the lock.
      double getAndLock​(Txn txn, LockMode lockMode)
      Gets the value using the provided txn and acquired the lock with the specified LockMode.
      double getAndSet​(double value)
      Sets the value the value and returns the new value.
      double getAndSet​(Txn txn, double value)
      Sets the value using the provided txn.
      double getAndSetAndLock​(double value, LockMode lockMode)
      Sets the value, acquired the Lock with the specified Lockmode and returns the previous value.
      double getAndSetAndLock​(Txn txn, double value, LockMode lockMode)
      Sets the value and acquired the Lock with the provided LockMode.
      double incrementAndGet​(double amount)
      Increments and gets the new value.
      double incrementAndGet​(Txn txn, double amount)
      Increments and gets the new value using the provided txn.
      double set​(double value)
      Sets the new value.
      double set​(Txn txn, double value)
      Sets the new value using the provided txn.
      double setAndLock​(double value, LockMode lockMode)
      Sets the new value and applies the lock.
      double setAndLock​(Txn txn, double value, LockMode lockMode)
      Sets the new value using the provided txn.
    • Method Detail

      • get

        double get()
        Gets the value using the provided txn.
        Returns:
        the current value.
        Throws:
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
        See Also:
        atomicGet()
      • getAndLock

        double getAndLock​(LockMode lockMode)
        Gets the value and applies the lock. If the current lockMode already is higher than the provided lockMode the Lock is not upgraded to a higher value.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        lockMode - the LockMode applied.
        Returns:
        the current value.
        Throws:
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
        See Also:
        atomicGet()
      • get

        double get​(Txn txn)
        Gets the value using the provided txn.
        Parameters:
        txn - the Txn used for this operation.
        Returns:
        the value stored in the ref.
        Throws:
        java.lang.NullPointerException - if txn is null.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • getAndLock

        double getAndLock​(Txn txn,
                          LockMode lockMode)
        Gets the value using the provided txn and acquired the lock with the specified LockMode.
        Parameters:
        txn - the Txn used for this operation.
        lockMode - the LockMode used
        Returns:
        the value stored in the ref.
        Throws:
        java.lang.NullPointerException - if txn is null or if lockMode is null. If LockMode is null and a running txn is available it will be aborted.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • set

        double set​(double value)
        Sets the new value.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        value - the new value.
        Returns:
        the new value.
        Throws:
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • setAndLock

        double setAndLock​(double value,
                          LockMode lockMode)
        Sets the new value and applies the lock.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        value - the new value.
        lockMode - the used LockMode.
        Returns:
        the new value.
        Throws:
        java.lang.NullPointerException - if lockMode is null (if the txn is alive, it will also be aborted.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • set

        double set​(Txn txn,
                   double value)
        Sets the new value using the provided txn.
        Parameters:
        txn - the Txn used for this operation.
        value - the new value
        Returns:
        the old value
        Throws:
        java.lang.NullPointerException - if txn is null.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • setAndLock

        double setAndLock​(Txn txn,
                          double value,
                          LockMode lockMode)
        Sets the new value using the provided txn.
        Parameters:
        txn - the Txn used for this operation.
        value - the new value
        lockMode - the lockMode used.
        Returns:
        the old value
        Throws:
        java.lang.NullPointerException - if txn is null or lockMode is null. If the lockMode is null and the txn is alive, it will be aborted.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • getAndSet

        double getAndSet​(double value)
        Sets the value the value and returns the new value.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        value - the new value.
        Returns:
        the old value.
        Throws:
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • getAndSetAndLock

        double getAndSetAndLock​(double value,
                                LockMode lockMode)
        Sets the value, acquired the Lock with the specified Lockmode and returns the previous value.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        value - the new value.
        lockMode - the LockMode used.
        Returns:
        the old value.
        Throws:
        java.lang.NullPointerException - if LockMode is null. If a running txn is available, it will be aborted.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • getAndSet

        double getAndSet​(Txn txn,
                         double value)
        Sets the value using the provided txn.
        Parameters:
        value - the new value.
        txn - the Txn used for this operation.
        Returns:
        the old value.
        Throws:
        java.lang.NullPointerException - if txn is null.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • getAndSetAndLock

        double getAndSetAndLock​(Txn txn,
                                double value,
                                LockMode lockMode)
        Sets the value and acquired the Lock with the provided LockMode.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        value - the new value.
        txn - the Txn used for this operation.
        lockMode - the LockMode used.
        Returns:
        the old value.
        Throws:
        java.lang.NullPointerException - if txn or LockMode is null. If the txn is running, and the LockMode is null, it will be aborted.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • atomicGet

        double atomicGet()
        Atomically gets the value. The value could be stale as soon as it is returned. This method doesn't care about any running txns. It could be that this call fails e.g. when a ref is locked. If you don't care about correct orderings, see the atomicWeakGet().
        Returns:
        the current value.
        Throws:
        TxnExecutionException
      • atomicWeakGet

        double atomicWeakGet()
        Atomically gets the value without providing any ordering guarantees. This method is extremely cheap and will never fail. So even if the ref is privatized, this call will still complete.

        It is the best method to call if you just want to get the current value stored.

        Returns:
        the value.
      • atomicSet

        double atomicSet​(double newValue)
        Atomically sets the value and returns the new value. This method doesn't care about any running txns.
        Parameters:
        newValue - the new value.
        Returns:
        the new value.
        Throws:
        TxnExecutionException
      • atomicGetAndSet

        double atomicGetAndSet​(double newValue)
        Atomically sets the value and returns the previous value. This method doesn't care about any running txns.
        Parameters:
        newValue - the new value.
        Returns:
        the old value.
        Throws:
        TxnExecutionException
      • commute

        void commute​(DoubleFunction function)
        Applies the function on the ref in a commuting manner. So if there are no dependencies, the function will commute. If somehow there already is a dependency or a dependency is formed on the result of the commuting function, the function will not commute and will be exactly the same as an alter.

        This is different than the behavior in Clojure where the commute will be re-applied at the end of the txn, even though some dependency is introduced, which can lead to inconsistencies.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        function - the function to apply to this reference.
        Throws:
        java.lang.NullPointerException - if function is null.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • commute

        void commute​(Txn txn,
                     DoubleFunction function)
        Applies the function on the ref in a commuting manner. So if there are no dependencies, the function will commute. If somehow there already is a dependency or a dependency is formed on the result of the commuting function, the function will not commute and will be exactly the same as an alter.

        This is different than the behavior in Clojure where the commute will be re-applied at the end of the txn, even though some dependency is introduced, which can lead to inconsistencies.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        txn - the Txn used for this operation.
        function - the function to apply to this reference.
        Throws:
        java.lang.NullPointerException - if function is null. If there is an active txn, it will be aborted.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • atomicAlterAndGet

        double atomicAlterAndGet​(DoubleFunction function)
        Atomically applies the function to the current value in this ref and returns the new value. This method doesn't care about any running txns.
        Parameters:
        function - the Function used
        Returns:
        the new value.
        Throws:
        java.lang.NullPointerException - if function is null.
      • alterAndGet

        double alterAndGet​(DoubleFunction function)
        Alters the value stored in this Ref using the provided function and returns the result.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        function - the function that alters the value stored in this Ref.
        Returns:
        the new value.
        Throws:
        java.lang.NullPointerException - if function is null. The Txn will also be aborted.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • alterAndGet

        double alterAndGet​(Txn txn,
                           DoubleFunction function)
        Alters the value stored in this Ref using the provided function and lifting on the provided txn.
        Parameters:
        function - the function that alters the value stored in this Ref.
        txn - the Txn used for this operation.
        Returns:
        the new value.
        Throws:
        java.lang.NullPointerException - if function or txn is null.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • atomicGetAndAlter

        double atomicGetAndAlter​(DoubleFunction function)
        Atomically applies the function to alter the value stored in this ref and returns the old value. This method doesn't care about any running txns.
        Parameters:
        function - the Function used
        Returns:
        the old value.
        Throws:
        java.lang.NullPointerException - if function is null.
        TxnExecutionException
      • getAndAlter

        double getAndAlter​(DoubleFunction function)
        Alters the value stored in this Ref using the provided function amd returns the old value.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        function - the function that alters the value stored in this Ref.
        Returns:
        the old value.
        Throws:
        java.lang.NullPointerException - if function is null. The txn will be aborted as well.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • getAndAlter

        double getAndAlter​(Txn txn,
                           DoubleFunction function)
        Alters the value stored in this Ref using the function and returns the old value, using the provided txn.
        Parameters:
        function - the function that alters the value stored in this Ref.
        txn - the Txn used for this operation.
        Returns:
        the old value
        Throws:
        java.lang.NullPointerException - if function or txn is null. The txn will be aborted as well.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • atomicCompareAndSet

        boolean atomicCompareAndSet​(double expectedValue,
                                    double newValue)
        Executes a compare and set atomically. This method doesn't care about any running txns.
        Parameters:
        expectedValue - the expected value.
        newValue - the new value.
        Returns:
        true if the compareAndSwap was a success, false otherwise.
        Throws:
        TxnExecutionException
      • atomicGetAndIncrement

        double atomicGetAndIncrement​(double amount)
        Atomically increments the value and returns the old value. This method doesn't care about any running txns.
        Parameters:
        amount - the amount to increase with.
        Returns:
        the old value.
        Throws:
        TxnExecutionException
      • getAndIncrement

        double getAndIncrement​(double amount)
        Increments the value and returns the old value.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        amount - the amount to increment with.
        Returns:
        the old value.
        Throws:
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • getAndIncrement

        double getAndIncrement​(Txn txn,
                               double amount)
        Increments the value and returns the old value using the provided txn.
        Parameters:
        txn - the Txn used for this operation.
        amount - the amount to increment with.
        Returns:
        the old value.
        Throws:
        java.lang.NullPointerException - if txn is null.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • atomicIncrementAndGet

        double atomicIncrementAndGet​(double amount)
        Atomically increments the value and returns the old value. This method doesn't care about any running txns.
        Parameters:
        amount - the amount to increment with.
        Returns:
        the new value.
        Throws:
        TxnExecutionException
      • incrementAndGet

        double incrementAndGet​(double amount)
        Increments and gets the new value.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        amount - the amount to increment with.
        Returns:
        the new value.
        Throws:
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • incrementAndGet

        double incrementAndGet​(Txn txn,
                               double amount)
        Increments and gets the new value using the provided txn.
        Parameters:
        txn - the Txn used for this operation.
        amount - the amount to increment with.
        Returns:
        the new value.
        Throws:
        java.lang.NullPointerException - if txn is null.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • await

        void await​(double value)
        Awaits for the value to become the given value. If the value already has the the specified value, the call continues, else a retry is done.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        value - the value to wait for.
        Throws:
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • await

        void await​(Txn txn,
                   double value)
        Awaits for the reference to become the given value. If the value already has the the specified value, the call continues, else a retry is done.
        Parameters:
        txn - the Txn used for this operation.
        value - the value to wait for.
        Throws:
        java.lang.NullPointerException - if txn is null.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • await

        void await​(DoublePredicate predicate)
        Awaits until the predicate holds. If the value already evaluates to true, the call continues else a retry is done. If the predicate throws an exception, the txn is aborted and the throwable is propagated.

        This call lifts on the Txn stored in the TxnThreadLocal.

        Parameters:
        predicate - the predicate to evaluate.
        Throws:
        java.lang.NullPointerException - if predicate is null. When there is a non dead txn, it will be aborted.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.
      • await

        void await​(Txn txn,
                   DoublePredicate predicate)
        Awaits until the predicate holds using the provided txn. If the value already evaluates to true, the call continues else a retry is done. If the predicate throws an exception, the txn is aborted and the throwable is propagated.
        Parameters:
        txn - the Txn used for this operation.
        predicate - the predicate to evaluate.
        Throws:
        java.lang.NullPointerException - if predicate is null or txn is null. When there is a non dead txn, it will be aborted.
        TxnExecutionException - if something failed while using the txn. The txn is guaranteed to have been aborted.
        ControlFlowError - if the Stm needs to control the flow in a different way than normal returns of exceptions. The txn is guaranteed to have been aborted.