1 files changed, 163 insertions, 0 deletions
diff --git a/pki/base/common/src/com/netscape/cms/servlet/common/CMSFileLoader.java b/pki/base/common/src/com/netscape/cms/servlet/common/CMSFileLoader.java
new file mode 100644
index 000000000..4a5b767ef
--- /dev/null
+++ b/pki/base/common/src/com/netscape/cms/servlet/common/CMSFileLoader.java
@@ -0,0 +1,163 @@
+// --- 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());
+            }
+        }
+    }
+}
+