Package dap4.servlet

Class DapCache

java.lang.Object

dap4.servlet.DapCache

public abstract class DapCache
extends Object

Provide an LRU cache of DSPs. It is expected (for now) that this is only used on the server side. The cache key is assumed to be the DSP object. The cache is synchronized to avoid race conditions. Note that we do not have to release because Java uses garbage collection and entries will be purged if the LRU cache is full. Singleton class

Field Summary

Fields

Modifier and Type	Field	Description
static dap4.core.data.DSPRegistry	dspregistry	Define a map of known DSP classes.
protected static DSPFactory	factory
protected static List<dap4.core.data.DSP>	lru	Define an lru cache of known DSP objects: oldest first.
static String	MATCHMETHOD

Constructor Summary

Constructors

Constructor	Description
DapCache()

Method Summary

Modifier and Type	Method	Description
static void	flush()
static DSPFactory	getFactory()
static dap4.core.data.DSP	open(String path, dap4.core.util.DapContext cxt)
static void	setFactory(DSPFactory f)

Methods inherited from class java.lang.Object

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

Field Detail

MATCHMETHOD

public static final String MATCHMETHOD

See Also:

Constant Field Values

dspregistry

public static dap4.core.data.DSPRegistry dspregistry

Define a map of known DSP classes.

lru

protected static List<dap4.core.data.DSP> lru

Define an lru cache of known DSP objects: oldest first.

factory

protected static DSPFactory factory

Constructor Detail

DapCache

public DapCache()

Method Detail

setFactory

public static void setFactory(DSPFactory f)

getFactory

public static DSPFactory getFactory()

open

public static dap4.core.data.DSP open(String path,
                                      dap4.core.util.DapContext cxt)
                               throws IOException

Throws:

IOException

flush

public static void flush()
                  throws Exception

Throws:

Exception