Class DefaultIoEventSizeEstimator

java.lang.Object
org.apache.mina.filter.executor.DefaultIoEventSizeEstimator
All Implemented Interfaces:
IoEventSizeEstimator
public class DefaultIoEventSizeEstimator extends Object implements IoEventSizeEstimator
A default IoEventSizeEstimator implementation.

Martin's Java Notes was used for estimation. For unknown types, it inspects declaring fields of the class of the specified event and the parameter of the event. The size of unknown declaring fields are approximated to the specified averageSizePerField (default: 64).

All the estimated sizes of classes are cached for performance improvement.

  • Field Details

    • class2size

      private final ConcurrentMap<Class<?>,Integer> class2size
      A map containing the estimated size of each Java objects we know for

  • Constructor Details

    • DefaultIoEventSizeEstimator

      public DefaultIoEventSizeEstimator()
      Create a new instance of this class, injecting the known size of basic java types.

  • Method Details

    • estimateSize

      public int estimateSize(IoEvent event)
      Estimate the IoEvent size in number of bytes
      Specified by:
      estimateSize in interface IoEventSizeEstimator
      Parameters:
      event - The event we want to estimate the size of
      Returns:
      The estimated size of this event

    • estimateSize

      public int estimateSize(Object message)
      Estimate the size of an Object in number of bytes
      Parameters:
      message - The object to estimate
      Returns:
      The estimated size of the object

    • estimateSize

      private int estimateSize(Class<?> clazz, Set<Class<?>> visitedClasses)

    • align

      private static int align(int size)