Package de.gsi.dataset.utils

Class DoubleArrayCache

java.lang.Object

java.util.AbstractCollection<T>

de.gsi.dataset.utils.CacheCollection<double[]>

de.gsi.dataset.utils.DoubleArrayCache

All Implemented Interfaces:

java.lang.Iterable<double[]>, java.util.Collection<double[]>

public class DoubleArrayCache
extends CacheCollection<double[]>

Implements double-array (double[]) cache collection to minimise memory re-allocation.

N.B. This is useful to re-use short-lived data storage container to minimise the amount of garbage to be collected. This is used in situation replacing e.g.

  
      public returnValue frequentlyExecutedFunction(...) {
          final double[] storage = new byte[10000]; // allocate new memory block (costly)
          // [...] do short-lived computation on storage
          // storage is implicitly finalised by garbage collector (costly)
      }
  
 

with

  
      // ...
      private final ByteArrayCache cache = new ByteArrayCache();
      // ...
      
      public returnValue frequentlyExecutedFunction(...) {
          final double[] storage = cache.getArray(10000); // return previously allocated array (cheap) or allocated new if necessary 
          // [...] do short-lived computation on storage
          cache.add(storage); // return object to cache
      }
  
 

Author:

rstein

Field Summary

Fields inherited from class de.gsi.dataset.utils.CacheCollection

contents

Constructor Summary

Constructors

Constructor	Description
DoubleArrayCache()

Method Summary

Modifier and Type	Method	Description
double[]	getArray(int requiredSize)
double[]	getArrayExact(int requiredSize)
static DoubleArrayCache	getInstance()

Methods inherited from class de.gsi.dataset.utils.CacheCollection

add, cleanup, clear, contains, iterator, remove, size

Methods inherited from class java.util.AbstractCollection

addAll, containsAll, isEmpty, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

equals, hashCode, parallelStream, removeIf, spliterator, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Constructor Detail

DoubleArrayCache

public DoubleArrayCache()

Method Detail

getArray

public double[] getArray(int requiredSize)

getArrayExact

public double[] getArrayExact(int requiredSize)

getInstance

public static DoubleArrayCache getInstance()