Package org.agrona.concurrent.status

Class UnsafeBufferPosition

java.lang.Object
org.agrona.concurrent.status.ReadablePosition
org.agrona.concurrent.status.Position
org.agrona.concurrent.status.UnsafeBufferPosition
All Implemented Interfaces:
AutoCloseable
public class UnsafeBufferPosition extends Position
Reports a position by recording it in an UnsafeBuffer.

  • Constructor Summary

    Constructors
    Constructor
    Description
    UnsafeBufferPosition(UnsafeBuffer buffer, int counterId)
    Map a position over a buffer.
    UnsafeBufferPosition(UnsafeBuffer buffer, int counterId, CountersManager countersManager)
    Map a position over a buffer and this indicator owns the counter for reclamation.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    close()
    long
    get()
    Get the current position of a component without memory ordering semantics.
    long
    getVolatile()
    Get the current position of a component with volatile semantics.
    int
    id()
    Identifier for this position.
    boolean
    isClosed()
    Has this Position been closed?
    boolean
    proposeMax(long proposedValue)
    Set the position to a new proposedValue if greater than the current value without memory ordering semantics.
    boolean
    proposeMaxOrdered(long proposedValue)
    Set the position to the new proposedValue if greater than the current value with memory ordering semantics.
    void
    set(long value)
    Sets the current position of the component without memory ordering semantics.
    void
    setOrdered(long value)
    Sets the current position of the component with ordered memory semantics.
    void
    setVolatile(long value)
    Sets the current position of the component with volatile memory semantics.
    String
    toString()

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

  • Constructor Details

    • UnsafeBufferPosition

      public UnsafeBufferPosition(UnsafeBuffer buffer, int counterId)
      Map a position over a buffer.
      Parameters:
      buffer - containing the counter.
      counterId - identifier of the counter.

    • UnsafeBufferPosition

      public UnsafeBufferPosition(UnsafeBuffer buffer, int counterId, CountersManager countersManager)
      Map a position over a buffer and this indicator owns the counter for reclamation.
      Parameters:
      buffer - containing the counter.
      counterId - identifier of the counter.
      countersManager - to be used for freeing the counter when this is closed.

  • Method Details

    • isClosed

      public boolean isClosed()
      Has this Position been closed?
      Specified by:
      isClosed in class Position
      Returns:
      true if this position has already been closed.

    • id

      public int id()
      Identifier for this position.
      Specified by:
      id in class ReadablePosition
      Returns:
      the identifier for this position.

    • get

      public long get()
      Get the current position of a component without memory ordering semantics.
      Specified by:
      get in class Position
      Returns:
      the current position of a component

    • getVolatile

      public long getVolatile()
      Get the current position of a component with volatile semantics.
      Specified by:
      getVolatile in class ReadablePosition
      Returns:
      the current position of a component with volatile semantics.

    • set

      public void set(long value)
      Sets the current position of the component without memory ordering semantics.
      Specified by:
      set in class Position
      Parameters:
      value - the current position of the component.

    • setOrdered

      public void setOrdered(long value)
      Sets the current position of the component with ordered memory semantics.
      Specified by:
      setOrdered in class Position
      Parameters:
      value - the current position of the component.

    • setVolatile

      public void setVolatile(long value)
      Sets the current position of the component with volatile memory semantics.
      Specified by:
      setVolatile in class Position
      Parameters:
      value - the current position of the component.

    • proposeMax

      public boolean proposeMax(long proposedValue)
      Set the position to a new proposedValue if greater than the current value without memory ordering semantics.
      Specified by:
      proposeMax in class Position
      Parameters:
      proposedValue - for the new max.
      Returns:
      true if a new max as been set otherwise false.

    • proposeMaxOrdered

      public boolean proposeMaxOrdered(long proposedValue)
      Set the position to the new proposedValue if greater than the current value with memory ordering semantics.
      Specified by:
      proposeMaxOrdered in class Position
      Parameters:
      proposedValue - for the new max.
      Returns:
      true if a new max as been set otherwise false.

    • close

      public void close()
      Specified by:
      close in interface AutoCloseable
      Specified by:
      close in class ReadablePosition

    • toString

      public String toString()
      Overrides:
      toString in class Object