Package org.xj3d.impl.core.loading

Class MemCacheLoadManager

java.lang.Object

org.xj3d.impl.core.loading.AbstractLoadManager

org.xj3d.impl.core.loading.MemCacheLoadManager

All Implemented Interfaces:

VRMLUrlListener, ContentLoadManager, LoadConstants

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: 1.1 $

Author:

Justin Couch

Field Summary

Fields inherited from interface org.xj3d.core.loading.LoadConstants

DEFAULT_SORT_ORDER, MEM_ALLOC_PROP, SORT_AUDIO, SORT_CREATE, SORT_INLINE, SORT_LOAD_URL, SORT_MOVIE, SORT_ORDER_PROP, SORT_OTHER, SORT_PROTO, SORT_SCRIPT, SORT_SHADER, SORT_TEXTURE

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
protected FileCache	getCache()	Request to fetch the cache used by the derived type.

Methods inherited from class org.xj3d.impl.core.loading.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 Details

MemCacheLoadManager

public MemCacheLoadManager()

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

Method Details

getCache

protected FileCache getCache()

Request to fetch the cache used by the derived type.

Specified by:

getCache in class AbstractLoadManager

Returns:

The file cache instance