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package org.apache.catalina.session;
import org.apache.catalina.Container;
import org.apache.catalina.Context;
import org.apache.catalina.Loader;
import org.apache.catalina.LogFacade;
import org.apache.catalina.Session;
import org.apache.catalina.core.StandardContext;
import javax.servlet.ServletContext;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Concrete implementation of the Store interface that utilizes
* a file per saved Session in a configured directory. Sessions that are
* saved are still subject to being expired based on inactivity.
*
* @author Craig R. McClanahan
* @version $Revision: 1.4 $ $Date: 2007/01/04 01:31:57 $
*/
public final class FileStore extends StoreBase {
private static final Logger log = LogFacade.getLogger();
private static final ResourceBundle rb = log.getResourceBundle();
// ----------------------------------------------------- Constants
/**
* The extension to use for serialized session filenames.
*/
private static final String FILE_EXT = ".session";
// ----------------------------------------------------- Instance Variables
/**
* The pathname of the directory in which Sessions are stored.
* This may be an absolute pathname, or a relative path that is
* resolved against the temporary work directory for this application.
*/
private String directory = ".";
/**
* A File representing the directory in which Sessions are stored.
*/
private File directoryFile = null;
/**
* The descriptive information about this implementation.
*/
private static final String info = "FileStore/1.0";
/**
* Name to register for this Store, used for logging.
*/
private static final String storeName = "fileStore";
/**
* Name to register for the background thread.
*/
private static final String threadName = "FileStore";
/**
* Our write-through cache of session objects
* HERCULES: addition
*/
private Hashtable sessions = new Hashtable();
// ------------------------------------------------------------- Properties
/**
* Return the directory path for this Store.
*/
public String getDirectory() {
return (directory);
}
/**
* Set the directory path for this Store.
*
* @param path The new directory path
*/
public void setDirectory(String path) {
String oldDirectory = this.directory;
this.directory = path;
this.directoryFile = null;
support.firePropertyChange("directory", oldDirectory,
this.directory);
}
/**
* Return descriptive information about this Store implementation and
* the corresponding version number, in the format
* <description>/<version>.
*/
public String getInfo() {
return (info);
}
/**
* Return the thread name for this Store.
*/
public String getThreadName() {
return(threadName);
}
/**
* Return the name for this Store, used for logging.
*/
public String getStoreName() {
return(storeName);
}
/**
* Return the number of Sessions present in this Store.
*
* @exception IOException if an input/output error occurs
*/
public int getSize() throws IOException {
// Acquire the list of files in our storage directory
File file = directory();
if (file == null) {
return (0);
}
String files[] = file.list();
// Figure out which files are sessions
int keycount = 0;
for (int i = 0; i < files.length; i++) {
if (files[i].endsWith(FILE_EXT)) {
keycount++;
}
}
return (keycount);
}
// --------------------------------------------------------- Public Methods
/**
* Remove all of the Sessions in this Store.
*
* @exception IOException if an input/output error occurs
*/
public void clear()
throws IOException {
String[] keys = keys();
for (int i = 0; i < keys.length; i++) {
remove(keys[i]);
}
}
/**
* Return an array containing the session identifiers of all Sessions
* currently saved in this Store. If there are no such Sessions, a
* zero-length array is returned.
*
* @exception IOException if an input/output error occurred
*/
public String[] keys() throws IOException {
// Acquire the list of files in our storage directory
File file = directory();
if (file == null) {
return (new String[0]);
}
String files[] = file.list();
// Build and return the list of session identifiers
ArrayList list = new ArrayList();
int n = FILE_EXT.length();
for (int i = 0; i < files.length; i++) {
if (files[i].endsWith(FILE_EXT)) {
list.add(files[i].substring(0, files[i].length() - n));
}
}
return list.toArray(new String[list.size()]);
}
/**
* Load and return the Session associated with the specified session
* identifier from this Store, without removing it. If there is no
* such stored Session, return null.
*
* @param id Session identifier of the session to load
*
* @exception ClassNotFoundException if a deserialization error occurs
* @exception IOException if an input/output error occurs
*/
public Session load(String id)
throws ClassNotFoundException, IOException {
//HERCULES:addition
// Check to see if it's in our cache first
Session sess = sessions.get(id);
if ( sess != null ) {
return sess;
}
//HERCULES:addition
// Open an input stream to the specified pathname, if any
File file = file(id);
if (file == null) {
return (null);
}
if (! file.exists()) {
return (null);
}
if (debug >= 1) {
String msg = MessageFormat.format(rb.getString(LogFacade.LOADING_SESSION_FROM_FILE),
new Object[] {id, file.getAbsolutePath()});
log(msg);
}
FileInputStream fis = null;
BufferedInputStream bis = null;
ObjectInputStream ois = null;
Loader loader = null;
ClassLoader classLoader = null;
try {
fis = new FileInputStream(file.getAbsolutePath());
bis = new BufferedInputStream(fis);
Container container = manager.getContainer();
if (container != null) {
ois = ((StandardContext)container).createObjectInputStream(bis);
} else {
ois = new ObjectInputStream(bis);
}
//end HERCULES:mod
} catch (FileNotFoundException e) {
if (debug >= 1)
log("No persisted data file found");
return (null);
} catch (IOException e) {
if (bis != null) {
try {
bis.close();
} catch (IOException f) {
// Ignore
}
}
if (fis != null) {
try {
fis.close();
} catch (IOException f) {
// Ignore
}
}
throw e;
}
try {
StandardSession session =
StandardSession.deserialize(ois, manager);
session.setManager(manager);
//HERCULES: addition
// Put it in the cache
sessions.put(session.getIdInternal(), session);
//HERCULES: addition
return (session);
} finally {
// Close the input stream
if (ois != null) {
try {
ois.close();
} catch (IOException f) {
// Ignore
}
}
}
}
/**
* Remove the Session with the specified session identifier from
* this Store, if present. If no such Session is present, this method
* takes no action.
*
* @param id Session identifier of the Session to be removed
*
* @exception IOException if an input/output error occurs
*/
public void remove(String id) throws IOException {
File file = file(id);
if (file == null) {
return;
}
if (debug >= 1) {
String msg = MessageFormat.format(rb.getString(LogFacade.REMOVING_SESSION_FROM_FILE),
new Object[] {id, file.getAbsolutePath()});
log(msg);
}
//HERCULES: addition
// Take it out of the cache
sessions.remove(id);
//HERCULES: addition
if (!file.delete() && log.isLoggable(Level.FINE)) {
log.log(Level.FINE, "Cannot delete file: " + file);
}
}
/**
* Save the specified Session into this Store. Any previously saved
* information for the associated session identifier is replaced.
*
* @param session Session to be saved
*
* @exception IOException if an input/output error occurs
*/
public void save(Session session) throws IOException {
// Open an output stream to the specified pathname, if any
File file = file(session.getIdInternal());
if (file == null) {
return;
}
if (debug >= 1) {
String msg = MessageFormat.format(rb.getString(LogFacade.SAVING_SESSION_TO_FILE),
new Object[] {session.getIdInternal(), file.getAbsolutePath()});
log(msg);
}
FileOutputStream fos = null;
ObjectOutputStream oos = null;
try {
fos = new FileOutputStream(file.getAbsolutePath());
Container container = manager.getContainer();
if (container != null) {
oos = ((StandardContext) container).createObjectOutputStream(
new BufferedOutputStream(fos));
} else {
oos = new ObjectOutputStream(new BufferedOutputStream(fos));
}
} catch (IOException e) {
if (fos != null) {
try {
fos.close();
} catch (IOException f) {
// Ignore
}
}
throw e;
}
try {
oos.writeObject(session);
} finally {
oos.close();
}
}
// -------------------------------------------------------- Private Methods
/**
* Return a File object representing the pathname to our
* session persistence directory, if any. The directory will be
* created if it does not already exist.
*/
private File directory() throws IOException {
if (this.directory == null) {
return (null);
}
if (this.directoryFile != null) {
// NOTE: Race condition is harmless, so do not synchronize
return (this.directoryFile);
}
File file = new File(this.directory);
if (!file.isAbsolute()) {
Container container = manager.getContainer();
if (container instanceof Context) {
ServletContext servletContext =
((Context) container).getServletContext();
File work = (File)
servletContext.getAttribute(ServletContext.TEMPDIR);
file = new File(work, this.directory);
} else {
throw new IllegalArgumentException
("Parent Container is not a Context");
}
}
if (!file.exists() || !file.isDirectory()) {
if (!file.delete() && file.exists()) {
String msg = MessageFormat.format(rb.getString(LogFacade.UNABLE_DELETE_FILE_EXCEPTION),
file);
throw new IOException(msg);
}
if (!file.mkdirs() && !file.isDirectory()) {
String msg = MessageFormat.format(rb.getString(LogFacade.UNABLE_CREATE_DIR_EXCEPTION),
file);
throw new IOException(msg);
}
}
this.directoryFile = file;
return (file);
}
/**
* Return a File object representing the pathname to our
* session persistence file, if any.
*
* @param id The ID of the Session to be retrieved. This is
* used in the file naming.
*/
private File file(String id) throws IOException {
if (this.directory == null) {
return (null);
}
String filename = id + FILE_EXT;
File file = new File(directory(), filename);
return (file);
}
}