org.apache.jetspeed.services.webpage
Class WebPageCache

java.lang.Object
  org.apache.jetspeed.services.webpage.WebPageCache

public class WebPageCache

extends java.lang.Object

Field Summary

static java.lang.String[]

CACHEABLE_RESOURCES Determines if a resource is cacheable, dependent on the extension: defined in CACHEABLE_RESOURCES (gif, jpeg, jpg, png, js, css)

Constructor Summary

WebPageCache()

Method Summary

static byte[]	getContentAndWrite(java.net.URLConnection con, ProxyRunData data) Retrieves the content from the proxied host for the requested.
static boolean	getResourceFromCache(java.lang.String resource, long sid, java.lang.String base, java.lang.String host, ProxyRunData data) Given a cacheable web resource, writes the content of that resource to the servlet output stream.
static boolean	isCacheableResource(java.lang.String resource)
static byte[]	rewriteScript(java.net.URLConnection con, long sid, java.lang.String host, ProxyRunData data, java.lang.String resource, java.lang.String base) Retrieves the script content from the proxied host for the requested.

Methods inherited from class java.lang.Object

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

Field Detail

CACHEABLE_RESOURCES

public static java.lang.String[] CACHEABLE_RESOURCES

Determines if a resource is cacheable, dependent on the extension: defined in CACHEABLE_RESOURCES (gif, jpeg, jpg, png, js, css)

Constructor Detail

WebPageCache

public WebPageCache()

Method Detail

getResourceFromCache

public static boolean getResourceFromCache(java.lang.String resource,
                                           long sid,
                                           java.lang.String base,
                                           java.lang.String host,
                                           ProxyRunData data)

Given a cacheable web resource, writes the content of that resource to the servlet output stream. The first time that the resource is requested, the content is fetched from the proxied host. From then on, the resource content is served up from the cache.

Parameters:

resource - the resource that is being cached.

base - the proxied host's base URL.

host - the Proxy Server base URL.

data - the RunData for the request.

Returns:

boolean true if the resource was read from the cache, false if read from the server.

isCacheableResource

public static boolean isCacheableResource(java.lang.String resource)

getContentAndWrite

public static byte[] getContentAndWrite(java.net.URLConnection con,
                                        ProxyRunData data)
                                 throws java.io.IOException

Retrieves the content from the proxied host for the requested. Per cacheable resource, this is only called once. All further requests will return the cached content. The content is immediately written to the servlet's response output stream.

Parameters:

con - the HTTP connection to the proxied host.

Returns:

byte[] the resource content, which will be stored in the cache.

Throws:

java.io.IOException

rewriteScript

public static byte[] rewriteScript(java.net.URLConnection con,
                                   long sid,
                                   java.lang.String host,
                                   ProxyRunData data,
                                   java.lang.String resource,
                                   java.lang.String base)
                            throws java.io.IOException

Retrieves the script content from the proxied host for the requested. Per cacheable resource, this is only called once. All further requests will return the cached content. The content is first rewritten, rewriting all links found in the script back to the Proxy server. Then, the content is immediately written to the servlet's response output stream.

Parameters:

con - the HTTP connection to the proxied host.

Returns:

byte[] the resource content, which will be stored in the cache.

Throws:

java.io.IOException