org.web3d.vrml.nodes.loader
Class MemCacheLoadManager

java.lang.Object
  org.web3d.vrml.nodes.loader.AbstractLoadManager
      org.web3d.vrml.nodes.loader.MemCacheLoadManager

All Implemented Interfaces:

ExternalLoadManager, org.web3d.vrml.nodes.loader.LoadConstants, VRMLUrlListener

public class MemCacheLoadManager

extends AbstractLoadManager

A manager for loading files that are external to the currently loading file eg Textures, inlines and protos.

The loader is given a scene and told to start loading the contents. During this time items progress from pending to loading to loaded. The load manager is cancelable so that a particular scene can be interrupted part way through loading. The manager is designed to load multiple scenes in parallel or to have parallel instances of this manager loading data.

This implementation has two memory constraints - the maximum allocated by the user and total constraints by the JVM. If the user specifies more memory for caching than the JVM will allow, we have to make do. For this, we use the standard WeakHashMap so that files that are consuming memory and not used can be discarded by the VM. Properties

The following properties are used by this class

• org.web3d.vrml.nodes.loader.cache.mem.size The amount of memory in Kilobytes (integer value) to allocate to in-memory file caching. If the value is zero or less, no caching is performed.

Note Sort order is not implemented yet.

Version:

$Revision: 1.12 $

Author:

Justin Couch

Field Summary

Fields inherited from class org.web3d.vrml.nodes.loader.AbstractLoadManager

MEM_ALLOC_PROP, SORT_AUDIO, SORT_INLINE, SORT_ORDER_PROP, SORT_OTHER, SORT_PROTO, SORT_SCRIPT, SORT_TEXTURE

Constructor Summary

MemCacheLoadManager()
Create a new load manager initialised with the content loading threads ready to work.

Method Summary

protected org.web3d.vrml.nodes.loader.FileCache

getCache() Request to fetch the cache used by the derived type.

Methods inherited from class org.web3d.vrml.nodes.loader.AbstractLoadManager

clear, getNumberInProgress, queueExternProtoLoad, queueNodesLoad, queueSceneLoad, setErrorReporter, shutdown, stopSceneLoad, urlChanged

Methods inherited from class java.lang.Object

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

Constructor Detail

MemCacheLoadManager

public MemCacheLoadManager()

Create a new load manager initialised with the content loading threads ready to work.

Method Detail

getCache

protected org.web3d.vrml.nodes.loader.FileCache getCache()

Request to fetch the cache used by the derived type.

Specified by:

getCache in class AbstractLoadManager

Returns:

The file cache instance