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// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.cms.servlet.common;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Enumeration;
import com.netscape.certsrv.base.IConfigStore;
import com.netscape.certsrv.base.EBaseException;
/**
* CMSFileLoader - file cache.
*
* @version $Revision$, $Date$
*/
public class CMSFileLoader {
// default max size
public final int MAX_SIZE = 200;
// default number of files to clear when max is reached.
public final int CLEAR_SIZE = 50;
// max size property
public final String PROP_MAX_SIZE = "maxSize";
// clear size property
public final String PROP_CLEAR_SIZE = "clearSize";
// property to cache templates only
public final String PROP_CACHE_TEMPLATES_ONLY = "cacheTemplatesOnly";
// hash of files to their content.
private Hashtable mLoadedFiles = new Hashtable();
// max number of files
private int mMaxSize = MAX_SIZE;
// number of files to clear when max is reached.
private int mClearSize = CLEAR_SIZE;
// whether to cache templates and forms only.
private boolean mCacheTemplatesOnly = true;
public CMSFileLoader() {
}
public void init(IConfigStore config) throws EBaseException {
mMaxSize = config.getInteger(PROP_MAX_SIZE, MAX_SIZE);
mClearSize = config.getInteger(PROP_CLEAR_SIZE, CLEAR_SIZE);
mCacheTemplatesOnly =
config.getBoolean(PROP_CACHE_TEMPLATES_ONLY, true);
}
// Changed by bskim
//public byte[] get(String absPath) throws EBaseException, IOException {
// File file = new File(absPath);
// return get(file);
//}
public byte[] get(String absPath, String enc) throws EBaseException, IOException {
File file = new File(absPath);
return get(file, enc);
}
// Change end
// Changed by bskim
//public byte[] get(File file) throws EBaseException, IOException {
// CMSFile cmsFile = getCMSFile(file);
public byte[] get(File file, String enc) throws EBaseException, IOException {
CMSFile cmsFile = getCMSFile(file, enc);
// Change end
return cmsFile.getContent();
}
// Changed by bskim
//public CMSFile getCMSFile(File file) throws EBaseException, IOException {
public CMSFile getCMSFile(File file, String enc) throws EBaseException, IOException {
// Change end
String absPath = file.getAbsolutePath();
long modified = file.lastModified();
CMSFile cmsFile = (CMSFile) mLoadedFiles.get(absPath);
long lastModified = (cmsFile == null ? 0 : cmsFile.getLastModified());
// new file.
if (cmsFile == null || modified != lastModified) {
// Changed by bskim
//cmsFile = updateFile(absPath, file);
cmsFile = updateFile(absPath, file, enc);
// Change end
}
cmsFile.setLastAccess(System.currentTimeMillis());
return cmsFile;
}
// Changed by bskim
//private CMSFile updateFile(String absPath, File file)
private CMSFile updateFile(String absPath, File file, String enc)
// Change end
throws EBaseException, IOException {
// clear if cache size exceeded.
if (mLoadedFiles.size() >= mMaxSize) {
clearSomeFiles();
}
CMSFile cmsFile = null;
// check if file is a js template or plain template by its first String
if (absPath.endsWith(CMSTemplate.SUFFIX)) {
// Changed by bskim
//cmsFile = new CMSTemplate(file);
cmsFile = new CMSTemplate(file, enc);
// End of Change
} else {
cmsFile = new CMSFile(file);
}
mLoadedFiles.put(absPath, cmsFile); // replace old one if any.
return cmsFile;
}
private synchronized void clearSomeFiles() {
// recheck this in case some other thread has cleared it.
if (mLoadedFiles.size() < mMaxSize)
return;
// remove the LRU files.
// XXX could be optimized more.
Enumeration elements = mLoadedFiles.elements();
for (int i = mClearSize; i > 0; i--) {
long lru = java.lang.Long.MAX_VALUE;
CMSFile lruFile = null;
while (elements.hasMoreElements()) {
CMSFile cmsFile = (CMSFile) elements.nextElement();
if (cmsFile.getLastAccess() < lru) {
lruFile = cmsFile;
}
mLoadedFiles.remove(lruFile.getAbsPath());
}
}
}
}
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