String getContent(String identifier) throws Exception {
logger.trace("Searching for '{}' in cache.", identifier);
ResourceWrapper wrapper = resources.get(identifier);
// If not in cache yet, load it
if (wrapper == null) {
long start = System.currentTimeMillis();
logger.debug("'{}' not in cache. Loading and processing...", identifier);
String extension = FilenameUtils.getExtension(identifier);
Type type = TypeFactory.getType(extension);
if (type == null) {
logger.warn("No type available for the specified resource: {}", extension);
throw new UnknownTypeException(
"No type available for the specified resource: " + extension);
}
String content = processContent(loader.loadResource(identifier), type);
wrapper = new ResourceWrapper(identifier, type, content);
resources.put(identifier, wrapper);
logger.debug("Resource loaded and processed in {} ms.", System.currentTimeMillis() - start);
} else {
// If in cache, check last modified
if (wrapper.getLastLoaded() < loader.lastModified(identifier)) {
// If last loaded was before last modified, load it again
wrapper.setContent(loader.loadResource(identifier));
}
}
return wrapper.getContent();
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String[] files = request.getParameterValues("file");
if (logger.isDebugEnabled()) {
logger.debug("Resource servlet received request to load files: {}", Arrays.toString(files));
}
if (files == null || files.length == 0) {
logger.warn("No resource specified, 'file' parameter is empty.");
response.sendError(
HttpServletResponse.SC_BAD_REQUEST, "No resource specified, 'file' parameter is empty.");
return;
}
try {
String requestedExtension = FilenameUtils.getExtension(request.getRequestURI());
logger.trace("Request done with extension {}", requestedExtension);
String answer = null;
if ("json".equals(requestedExtension)) {
/* If extension was .json, then it will return all resources as
* a JSON object.
*/
response.setContentType(CONTENT_TYPE_JSON);
answer = renderContentAsJson(files);
} else {
// Any other extension will set content type for the type of the first file requested
response.setContentType(
TypeFactory.getType(FilenameUtils.getExtension(files[0])).getContentType());
answer = renderContentAsText(files);
}
logger.trace("--- Sending response to client ---\n{}", answer);
response.getWriter().write(answer);
} catch (ResourceNotFoundException ex) {
response.sendError(
HttpServletResponse.SC_NOT_FOUND, "Resource not found: " + ex.getMessage());
logger.warn("Resource not found.", ex);
} catch (Exception ex) {
response.sendError(
HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
"Error while loading resource: " + ex.getMessage());
logger.error("Error while loading resoruce.", ex);
}
}
