Module com.aoapps.servlet.util

Package com.aoapps.servlet

Class ServletContextCache

java.lang.Object

com.aoapps.servlet.ServletContextCache

public final class ServletContextCache
extends Object

ServletContext methods can be somewhat slow, this offers a cache that refreshes the recently used values in the background. Importantly, it caches misses as well.

Author:

AO Industries, Inc.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ServletContextCache.Initializer	Initializes the cache during application start-up.

Method Summary

Modifier and Type	Method	Description
static ServletContextCache	getCache(ServletContext servletContext)	Deprecated. Please use getInstance(javax.servlet.ServletContext).
static ServletContextCache	getInstance(ServletContext servletContext)	Gets or creates the cache for the provided servlet context.
long	getLastModified(String path)	Gets a modified time from either a file or URL.
static long	getLastModified(ServletContext servletContext, String path)
String	getRealPath(String path)
static String	getRealPath(ServletContext servletContext, String path)
URL	getResource(String path)	Gets the possibly cached URL.
static URL	getResource(ServletContext servletContext, String path)

Methods inherited from class java.lang.Object

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

Method Details

getInstance

public static ServletContextCache getInstance(ServletContext servletContext)

Gets or creates the cache for the provided servlet context.

getCache

@Deprecated
public static ServletContextCache getCache(ServletContext servletContext)

Deprecated.

Please use getInstance(javax.servlet.ServletContext).

getResource

public URL getResource(String path)
                throws MalformedURLException

Gets the possibly cached URL. This URL is not copied and caller should not fiddle with its state. Thank you Java for this not being immutable.

Throws:

MalformedURLException

See Also:

• ServletContext.getResource(java.lang.String)

getResource

public static URL getResource(ServletContext servletContext,
 String path)
                       throws MalformedURLException

Throws:

MalformedURLException

See Also:

• getResource(java.lang.String)

getRealPath

public String getRealPath(String path)

See Also:

• ServletContext.getRealPath(java.lang.String)

getRealPath

public static String getRealPath(ServletContext servletContext,
 String path)

See Also:

• getRealPath(java.lang.String)

getLastModified

public long getLastModified(String path)

Gets a modified time from either a file or URL.

Returns:

The modified time or 0L when not known

See Also:

• getRealPath(java.lang.String)
• File.lastModified()
• getResource(java.lang.String)
• URLConnection.getLastModified()

getLastModified

public static long getLastModified(ServletContext servletContext,
 String path)

See Also:

• getLastModified(java.lang.String)