/*
* Copyright (c) 2009, 2010, 2011, 2012, B3log Team
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.b3log.solo.processor;
import java.io.IOException;
import java.util.logging.Level;
import org.b3log.solo.util.Users;
import java.util.logging.Logger;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.b3log.latke.action.AbstractAction;
import org.b3log.latke.annotation.RequestProcessing;
import org.b3log.latke.annotation.RequestProcessor;
import org.b3log.latke.cache.PageCaches;
import org.b3log.latke.servlet.HTTPRequestContext;
import org.b3log.latke.servlet.HTTPRequestMethod;
import org.b3log.latke.servlet.renderer.DoNothingRenderer;
import org.b3log.latke.util.Strings;
import org.b3log.solo.model.Common;
import org.json.JSONObject;
/**
* Cache processor.
*
* @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
* @version 1.1.0.1, May 11, 2012
* @since 0.3.1
*/
@RequestProcessor
public final class CacheProcessor {
/**
* Logger.
*/
private static final Logger LOGGER = Logger.getLogger(CacheProcessor.class.getName());
/**
* User utilities.
*/
private Users userUtils = Users.getInstance();
/**
* Clears cache with the specified context.
*
* @param context the specified context
* @param request the specified HTTP servlet request
* @param response the specified HTTP servlet response
* @throws IOException io exception
*/
@RequestProcessing(value = "/clear-cache.do", method = HTTPRequestMethod.POST)
public void clearCache(final HTTPRequestContext context, final HttpServletRequest request, final HttpServletResponse response)
throws IOException {
LoginProcessor.tryLogInWithCookie(request, response);
if (!userUtils.isAdminLoggedIn(request)) {
response.sendError(HttpServletResponse.SC_FORBIDDEN);
return;
}
try {
final JSONObject requestJSONObject = AbstractAction.parseRequestJSONObject(request, response);
final String all = requestJSONObject.optString("all");
if (Strings.isEmptyOrNull(all)) { // Just clears single page cache
final String uri = requestJSONObject.optString(Common.URI);
clearPageCache(uri);
} else { // Clears all page caches
clearAllPageCache();
}
context.setRenderer(new DoNothingRenderer());
} catch (final Exception e) {
LOGGER.log(Level.SEVERE, e.getMessage(), e);
}
}
/**
* Clears a page cache specified by the given URI.
*
* @param uri the specified URI
*/
private void clearPageCache(final String uri) {
final String pageCacheKey = PageCaches.getPageCacheKey(uri, null);
LOGGER.log(Level.INFO, "Clears page cache[pageCacheKey={0}]", pageCacheKey);
PageCaches.remove(pageCacheKey);
}
/**
* Clears all page cache.
*/
private void clearAllPageCache() {
PageCaches.removeAll();
}
}