Package org.springframework.data.redis.support.atomic

Class RedisAtomicDouble

java.lang.Object
java.lang.Number
org.springframework.data.redis.support.atomic.RedisAtomicDouble
All Implemented Interfaces:
Serializable, BoundKeyOperations<String>
public class RedisAtomicDouble extends Number implements Serializable, BoundKeyOperations<String>
Atomic double backed by Redis. Uses Redis atomic increment/decrement and watch/multi/exec operations for CAS operations.
Author:
Jennifer Hickey, Thomas Darimont, Christoph Strobl, Mark Paluch, Graham MacMaster, Ning Wei
See Also:

  • Constructor Details

    • RedisAtomicDouble

      public RedisAtomicDouble(String redisCounter, RedisConnectionFactory factory)
      Constructs a new RedisAtomicDouble instance. Uses the value existing in Redis or 0 if none is found.
      Parameters:
      redisCounter - Redis key of this counter.
      factory - connection factory.

    • RedisAtomicDouble

      public RedisAtomicDouble(String redisCounter, RedisConnectionFactory factory, double initialValue)
      Constructs a new RedisAtomicDouble instance with a initialValue that overwrites the existing value.
      Parameters:
      redisCounter - Redis key of this counter.
      factory - connection factory.
      initialValue - initial value to set.

    • RedisAtomicDouble

      public RedisAtomicDouble(String redisCounter, RedisOperations<String,Double> template)
      Constructs a new RedisAtomicDouble instance. Uses the value existing in Redis or 0 if none is found.
      Parameters:
      redisCounter - Redis key of this counter.
      template - the template.
      See Also:

    • RedisAtomicDouble

      public RedisAtomicDouble(String redisCounter, RedisOperations<String,Double> template, double initialValue)
      Constructs a new RedisAtomicDouble instance with a initialValue that overwrites the existing value at redisCounter.

      Note: You need to configure the given template with appropriate RedisSerializer for the key and value.

      As an alternative one could use the RedisAtomicDouble(String, RedisConnectionFactory, Double) constructor which uses appropriate default serializers.

      Parameters:
      redisCounter - Redis key of this counter.
      template - the template
      initialValue - initial value to set if the Redis key is absent.

  • Method Details

    • get

      public double get()
      Get the current value.
      Returns:
      the current value.

    • set

      public void set(double newValue)
      Set to the given value.
      Parameters:
      newValue - the new value.

    • getAndSet

      public double getAndSet(double newValue)
      Set to the given value and return the old value.
      Parameters:
      newValue - the new value.
      Returns:
      the previous value.

    • compareAndSet

      public boolean compareAndSet(double expect, double update)
      Atomically set the value to the given updated value if the current value == the expected value.
      Parameters:
      expect - the expected value.
      update - the new value.
      Returns:
      true if successful. false indicates that the actual value was not equal to the expected value.

    • getAndIncrement

      public double getAndIncrement()
      Atomically increment by one the current value.
      Returns:
      the previous value.

    • getAndDecrement

      public double getAndDecrement()
      Atomically decrement by one the current value.
      Returns:
      the previous value.

    • getAndAdd

      public double getAndAdd(double delta)
      Atomically add the given value to current value.
      Parameters:
      delta - the value to add.
      Returns:
      the previous value.

    • getAndUpdate

      public double getAndUpdate(DoubleUnaryOperator updateFunction)
      Atomically update the current value using the given update function.
      Parameters:
      updateFunction - the function which calculates the value to set. Should be a pure function (no side effects), because it will be applied several times if update attempts fail due to concurrent calls. Must not be null.
      Returns:
      the previous value.
      Since:
      2.2

    • getAndAccumulate

      public double getAndAccumulate(double updateValue, DoubleBinaryOperator accumulatorFunction)
      Atomically update the current value using the given accumulator function. The new value is calculated by applying the accumulator function to the current value and the given updateValue.
      Parameters:
      updateValue - the value which will be passed into the accumulator function.
      accumulatorFunction - the function which calculates the value to set. Should be a pure function (no side effects), because it will be applied several times if update attempts fail due to concurrent calls. Must not be null.
      Returns:
      the previous value.
      Since:
      2.2

    • incrementAndGet

      public double incrementAndGet()
      Atomically increment by one the current value.
      Returns:
      the updated value.

    • decrementAndGet

      public double decrementAndGet()
      Atomically decrement by one the current value.
      Returns:
      the updated value.

    • addAndGet

      public double addAndGet(double delta)
      Atomically add the given value to current value.
      Parameters:
      delta - the value to add.
      Returns:
      the updated value.

    • updateAndGet

      public double updateAndGet(DoubleUnaryOperator updateFunction)
      Atomically update the current value using the given update function.
      Parameters:
      updateFunction - the function which calculates the value to set. Should be a pure function (no side effects), because it will be applied several times if update attempts fail due to concurrent calls. Must not be null.
      Returns:
      the updated value.
      Since:
      2.2

    • accumulateAndGet

      public double accumulateAndGet(double updateValue, DoubleBinaryOperator accumulatorFunction)
      Atomically update the current value using the given accumulator function. The new value is calculated by applying the accumulator function to the current value and the given updateValue.
      Parameters:
      updateValue - the value which will be passed into the accumulator function.
      accumulatorFunction - the function which calculates the value to set. Should be a pure function (no side effects), because it will be applied several times if update attempts fail due to concurrent calls. Must not be null.
      Returns:
      the updated value.
      Since:
      2.2

    • toString

      public String toString()
      Overrides:
      toString in class Object
      Returns:
      the String representation of the current value.

    • getKey

      public String getKey()
      Description copied from interface: BoundKeyOperations
      Returns the key associated with this entity.
      Specified by:
      getKey in interface BoundKeyOperations<String>
      Returns:
      key associated with the implementing entity

    • getType

      public DataType getType()
      Description copied from interface: BoundKeyOperations
      Returns the associated Redis type.
      Specified by:
      getType in interface BoundKeyOperations<String>
      Returns:
      key type. null when used in pipeline / transaction.

    • getExpire

      public Long getExpire()
      Description copied from interface: BoundKeyOperations
      Returns the expiration of this key.
      Specified by:
      getExpire in interface BoundKeyOperations<String>
      Returns:
      expiration value (in seconds). null when used in pipeline / transaction.

    • expire

      public Boolean expire(long timeout, TimeUnit unit)
      Description copied from interface: BoundKeyOperations
      Sets the key time-to-live/expiration.
      Specified by:
      expire in interface BoundKeyOperations<String>
      Parameters:
      timeout - expiration value
      unit - expiration unit
      Returns:
      true if expiration was set, false otherwise. null when used in pipeline / transaction.

    • expireAt

      public Boolean expireAt(Date date)
      Description copied from interface: BoundKeyOperations
      Sets the key time-to-live/expiration.
      Specified by:
      expireAt in interface BoundKeyOperations<String>
      Parameters:
      date - expiration date
      Returns:
      true if expiration was set, false otherwise. null when used in pipeline / transaction.

    • persist

      public Boolean persist()
      Description copied from interface: BoundKeyOperations
      Removes the expiration (if any) of the key.
      Specified by:
      persist in interface BoundKeyOperations<String>
      Returns:
      true if expiration was removed, false otherwise. null when used in pipeline / transaction.

    • rename

      public void rename(String newKey)
      Description copied from interface: BoundKeyOperations
      Renames the key.
      Note: The new name for empty collections will be propagated on add of first element.
      Specified by:
      rename in interface BoundKeyOperations<String>
      Parameters:
      newKey - new key. Must not be null.

    • getOperations

      public RedisOperations<String,?> getOperations()
      Specified by:
      getOperations in interface BoundKeyOperations<String>
      Returns:
      never null.

    • intValue

      public int intValue()
      Specified by:
      intValue in class Number

    • longValue

      public long longValue()
      Specified by:
      longValue in class Number

    • floatValue

      public float floatValue()
      Specified by:
      floatValue in class Number

    • doubleValue

      public double doubleValue()
      Specified by:
      doubleValue in class Number