/* ------------------------------------------------------------ */
private HttpContent load(String pathInContext, Resource resource) throws IOException {
Content content = null;
if (resource == null || !resource.exists()) return null;
// Will it fit in the cache?
if (!resource.isDirectory() && isCacheable(resource)) {
// Create the Content (to increment the cache sizes before adding the content
content = new Content(pathInContext, resource);
// reduce the cache to an acceptable size.
shrinkCache();
// Add it to the cache.
Content added = _cache.putIfAbsent(pathInContext, content);
if (added != null) {
content.invalidate();
content = added;
}
return content;
}
return new HttpContent.ResourceAsHttpContent(
resource,
_mimeTypes.getMimeByExtension(resource.toString()),
getMaxCachedFileSize(),
_etags);
}
/* ------------------------------------------------------------ */
private void shrinkCache() {
// While we need to shrink
while (_cache.size() > 0
&& (_cachedFiles.get() > _maxCachedFiles || _cachedSize.get() > _maxCacheSize)) {
// Scan the entire cache and generate an ordered list by last accessed time.
SortedSet<Content> sorted =
new TreeSet<Content>(
new Comparator<Content>() {
public int compare(Content c1, Content c2) {
if (c1._lastAccessed < c2._lastAccessed) return -1;
if (c1._lastAccessed > c2._lastAccessed) return 1;
if (c1._length < c2._length) return -1;
return c1._key.compareTo(c2._key);
}
});
for (Content content : _cache.values()) sorted.add(content);
// Invalidate least recently used first
for (Content content : sorted) {
if (_cachedFiles.get() <= _maxCachedFiles && _cachedSize.get() <= _maxCacheSize) break;
if (content == _cache.remove(content.getKey())) content.invalidate();
}
}
}
/* ------------------------------------------------------------ */
public void flushCache() {
if (_cache != null) {
while (_cache.size() > 0) {
for (String path : _cache.keySet()) {
Content content = _cache.remove(path);
if (content != null) content.invalidate();
}
}
}
}
