org.jlab.coda.jevio

Class MappedMemoryHandler

java.lang.Object

org.jlab.coda.jevio.MappedMemoryHandler

public class MappedMemoryHandler
extends java.lang.Object

This is a class designed to handle access of evio version 4 format files with size greater than 2.1 GBytes. Currently the largest size memory map that Java can handle is Integer.MAX_VALUE which limits the use of memory mapping to looking at files that size or smaller. This class circumvents this limit by viewing large files as a collection of multiple memory maps.

The problem is that we do NOT want an evio event which is split between 2 different memory maps. This is addressed by scanning a memory map of the largest size to find the last complete evio block it contains. The next memory map then starts at the following block.

Just a note about synchronization. This object is NOT threadsafe but it doesn't have to be since its use in EvioReader is synchronized and therefore there should be not be thread unsafe.

Author:

timmer

Method Summary

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait