import de.halbekunst.juplo.cachecontrol.annotations.LastModified;
import de.halbekunst.juplo.cachecontrol.annotations.ETag;
import java.lang.annotation.Annotation;
-import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Date;
import java.util.Map;
public class CacheControl {
private final static Logger log = LoggerFactory.getLogger(CacheControl.class);
- public static final String HEADER_DATE = "Date";
- public static final String HEADER_CACHE_CONTROL = "Cache-Control";
- public static final String HEADER_LAST_MODIFIED = "Last-Modified";
- public static final String HEADER_ETAG = "ETag";
- public static final String HEADER_EXPIRES = "Expires";
- public static final String HEADER_PRAGMA = "Pragma";
- public static final String HEADER_IF_MODIFIED_SINCE = "If-Modified-Since";
- public static final String HEADER_IF_NONE_MATCH = "If-None-Match";
- public static final String HEADER_RANGE = "Range";
-
private static final ThreadLocal<CacheMethodHandle> tl = new ThreadLocal<CacheMethodHandle>();
private Integer defaultCacheSeconds;
private Long defaultLastModified;
- public void init(Object handler) throws Exception {
- if (CacheControl.tl.get() == null)
- CacheControl.tl.set(new ReflectionCacheMethodHandle(handler));
+ public void init(CacheMethodHandle handle) {
+ CacheControl.tl.set(handle);
+ }
+
+ public void init(Object handler) throws NoSuchMethodException {
+ CacheControl.tl.set(new ReflectionCacheMethodHandle(handler));
}
public boolean decorate(
HttpServletRequest request,
HttpServletResponse response,
Object handler
- ) throws Exception
+ )
{
try {
CacheMethodHandle controller = CacheControl.tl.get();
* http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.18 RFC 2616,
* Abschnitt 14.18} einen Date-Header enthalten
*/
- response.setDateHeader(HEADER_DATE, controller.getTimestamp());
+ response.setDateHeader(HeaderNames.HEADER_DATE, controller.getTimestamp());
/** Besondere Maßnahmen für besondere HTTP-Status-Codes ?!? */
int status = controller.accepts(request);
case HttpServletResponse.SC_NOT_IMPLEMENTED: // 501
case HttpServletResponse.SC_SERVICE_UNAVAILABLE: // 503
case HttpServletResponse.SC_HTTP_VERSION_NOT_SUPPORTED: // 505
- /**
- * Ein Fehlercode kann stellvertretend für den Handler gesendet werden,
- * da im Fehlerfall eh keine weiteren Daten ausgegeben werden!
- */
- response.sendError(status);
return true;
default:
/**
int cacheSeconds = controller.getCacheSeconds(request);
if (cacheSeconds < 1) {
log.debug("{}: caching disabled!", url);
- response.setDateHeader(HEADER_DATE, controller.getTimestamp());
- response.setDateHeader(HEADER_EXPIRES, 0);
- response.addHeader(HEADER_PRAGMA, "no-cache");
- response.addHeader(HEADER_CACHE_CONTROL, "private");
- response.addHeader(HEADER_CACHE_CONTROL, "no-cache");
- response.addHeader(HEADER_CACHE_CONTROL, "no-store");
- response.addHeader(HEADER_CACHE_CONTROL, "max-age=0");
- response.addHeader(HEADER_CACHE_CONTROL, "s-max-age=0");
+ response.setDateHeader(HeaderNames.HEADER_DATE, controller.getTimestamp());
+ response.setDateHeader(HeaderNames.HEADER_EXPIRES, 0);
+ response.addHeader(HeaderNames.HEADER_PRAGMA, "no-cache");
+ response.addHeader(HeaderNames.HEADER_CACHE_CONTROL, "private");
+ response.addHeader(HeaderNames.HEADER_CACHE_CONTROL, "no-cache");
+ response.addHeader(HeaderNames.HEADER_CACHE_CONTROL, "no-store");
+ response.addHeader(HeaderNames.HEADER_CACHE_CONTROL, "max-age=0");
+ response.addHeader(HeaderNames.HEADER_CACHE_CONTROL, "s-max-age=0");
return true;
}
long ifModifiedSince = -1;
try {
- ifModifiedSince = request.getDateHeader(HEADER_IF_MODIFIED_SINCE);
+ ifModifiedSince = request.getDateHeader(HeaderNames.HEADER_IF_MODIFIED_SINCE);
}
catch (Exception e) {
log.error("Exception while fetching If-Modified-Since: {}", e);
*/
lastModified = lastModified - (lastModified % 1000);
- String ifNoneMatch = request.getHeader(HEADER_IF_NONE_MATCH);
+ String ifNoneMatch = request.getHeader(HeaderNames.HEADER_IF_NONE_MATCH);
String eTag = controller.getETag(request);
/**
builder.append('"');
builder.append(eTag);
builder.append('"');
- response.setHeader(HEADER_ETAG, builder.toString());
+ response.setHeader(HeaderNames.HEADER_ETAG, builder.toString());
}
ifNoneMatch = ifNoneMatch.substring(1, ifNoneMatch.length() - 1);
}
- if (!weak || (request.getMethod().equals("GET") && request.getHeader(HEADER_RANGE) == null)) {
+ if (!weak || (request.getMethod().equals("GET") && request.getHeader(HeaderNames.HEADER_RANGE) == null)) {
/**
* Die Gleichheit gilt nur, wenn die ETag's der Anfrage _und_ der
* Antwort stark sind (starke Gleichheit!), oder wenn die Antwort nur
log.debug("{}: first up!", url);
/** HTTP/1.1-Caching-Header richtig setzen!! */
- response.setDateHeader(HEADER_LAST_MODIFIED, lastModified);
+ response.setDateHeader(HeaderNames.HEADER_LAST_MODIFIED, lastModified);
/** Cache-Control für HTTP/1.1-Clients generieren */
Map<String, String> cacheControl = new TreeMap<String, String>();
* <code>Expires</code>-Header für HTTP/1.0-Clients setzen.
*/
cacheControl.put("max-age", Integer.toString(cacheSeconds));
- response.setDateHeader(HEADER_EXPIRES, (controller.getTimestamp() + (long) cacheSeconds * 1000));
+ response.setDateHeader(HeaderNames.HEADER_EXPIRES, (controller.getTimestamp() + (long) cacheSeconds * 1000));
}
/** Dem Handler die Gelegenheit geben, den Cache-Controll-Header anzupassen */
* http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.32
* Abschnitt 14.32})
*/
- response.setDateHeader(HEADER_EXPIRES, 0l);
- response.addHeader(HEADER_PRAGMA, "no-cache");
+ response.setDateHeader(HeaderNames.HEADER_EXPIRES, 0l);
+ response.addHeader(HeaderNames.HEADER_PRAGMA, "no-cache");
}
StringBuilder builder = new StringBuilder();
builder.append('=');
builder.append(entry.getValue());
}
- response.addHeader(HEADER_CACHE_CONTROL, builder.toString());
+ response.addHeader(HeaderNames.HEADER_CACHE_CONTROL, builder.toString());
}
return true;
}
- interface CacheMethodHandle {
+ public interface CacheMethodHandle {
long getTimestamp();
- int accepts(HttpServletRequest request) throws Exception;
- int getCacheSeconds(HttpServletRequest request) throws Exception;
- long getLastModified(HttpServletRequest request) throws Exception;
- String getETag(HttpServletRequest request) throws Exception;
+ int accepts(HttpServletRequest request);
+ int getCacheSeconds(HttpServletRequest request);
+ long getLastModified(HttpServletRequest request);
+ String getETag(HttpServletRequest request);
boolean isETagWeak();
- void cacheControl(HttpServletRequest request, Map<String, String> cacheControlMap) throws Exception;
+ void cacheControl(HttpServletRequest request, Map<String, String> cacheControlMap);
}
}
@Override
- public int accepts(HttpServletRequest request)
- throws IllegalAccessException,
- IllegalArgumentException,
- InvocationTargetException
- {
- if (acceptsMethod == null)
+ public int accepts(HttpServletRequest request) throws IllegalArgumentException {
+ if (acceptsMethod == null) {
return HttpServletResponse.SC_OK;
- else
- return (Integer)acceptsMethod.invoke(handler, request);
+ }
+ else {
+ try {
+ return (Integer)acceptsMethod.invoke(handler, request);
+ }
+ catch (Exception e) {
+ throw new IllegalArgumentException(e);
+ }
+ }
}
@Override
- public int getCacheSeconds(HttpServletRequest request)
- throws IllegalAccessException,
- IllegalArgumentException,
- InvocationTargetException
- {
- if (cacheSecondsMethod == null)
+ public int getCacheSeconds(HttpServletRequest request) throws IllegalArgumentException {
+ if (cacheSecondsMethod == null) {
return cacheSeconds;
- else
- return (Integer)cacheSecondsMethod.invoke(handler, request);
+ }
+ else {
+ try {
+ return (Integer)cacheSecondsMethod.invoke(handler, request);
+ }
+ catch (Exception e) {
+ throw new IllegalArgumentException(e);
+ }
+ }
}
@Override
- public long getLastModified(HttpServletRequest request)
- throws IllegalAccessException,
- IllegalArgumentException,
- InvocationTargetException
- {
- if (lastModifiedMethod == null)
+ public long getLastModified(HttpServletRequest request) throws IllegalArgumentException {
+ if (lastModifiedMethod == null) {
return lastModified;
- else
- return (Long)lastModifiedMethod.invoke(handler, request);
+ }
+ else {
+ try {
+ return (Long)lastModifiedMethod.invoke(handler, request);
+ }
+ catch (Exception e) {
+ throw new IllegalArgumentException(e);
+ }
+ }
}
@Override
- public String getETag(HttpServletRequest request)
- throws IllegalAccessException,
- IllegalArgumentException,
- InvocationTargetException
- {
- if (eTagMethod == null)
+ public String getETag(HttpServletRequest request) throws IllegalArgumentException {
+ if (eTagMethod == null) {
return eTag;
- else
- return (String)eTagMethod.invoke(handler, request);
+ }
+ else {
+ try {
+ return (String)eTagMethod.invoke(handler, request);
+ }
+ catch (Exception e) {
+ throw new IllegalArgumentException(e);
+ }
+ }
}
@Override
HttpServletRequest request,
Map<String, String> cacheControlMap
)
- throws IllegalAccessException,
- IllegalArgumentException,
- InvocationTargetException
+ throws IllegalArgumentException
{
- if (cacheControlMethod != null)
- cacheControlMethod.invoke(handler, request, cacheControlMap);
+ if (cacheControlMethod != null) {
+ try {
+ cacheControlMethod.invoke(handler, request, cacheControlMap);
+ }
+ catch (Exception e) {
+ throw new IllegalArgumentException(e);
+ }
+ }
}
}