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Posted to slide-user@jakarta.apache.org by Eugeny N Dzhurinsky <eu...@jdevelop.com> on 2006/02/15 17:50:11 UTC
Virtual FS store implementation for WCK
Sorry for asking so many dumb questions here, but I'm lost.
I'm trying to create virtual file system with no ability to create folders and
list resources, but with ability to read and write to predefined resources.
Mapping between allowed resources and files on disk located in Map accessed by
MappingSingleton (it's nothing except synchronized hashmap with disk file storage
at the backend)
I created BasicWebdavStore implementation:
package webdav.store;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.security.Principal;
import java.util.Date;
import java.util.Hashtable;
import java.util.Map;
import org.apache.commons.transaction.util.LoggerFacade;
import org.apache.slide.common.Service;
import org.apache.slide.common.ServiceAccessException;
import org.apache.slide.common.ServiceParameterErrorException;
import org.apache.slide.common.ServiceParameterMissingException;
import org.apache.slide.lock.ObjectLockedException;
import org.apache.slide.security.AccessDeniedException;
import org.apache.slide.security.UnauthenticatedException;
import org.apache.slide.simple.store.BasicWebdavStore;
import org.apache.slide.structure.ObjectAlreadyExistsException;
import org.apache.slide.structure.ObjectNotFoundException;
/**
* Virtual filesystem store
*/
public class VirtualFileSystemStoreImpl implements BasicWebdavStore {
public static final String MAPPING = "mapping";
private static final String FILES = "/files";
private static LoggerFacade logger;
/**
* Mapping instance
*/
private MappingSingleton mappings;
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#begin(org.apache.slide.common.Service,
* java.security.Principal, java.lang.Object,
* org.apache.commons.transaction.util.LoggerFacade,
* java.util.Hashtable)
*/
public void begin(Service service, Principal principal, Object connection,
LoggerFacade logger, Hashtable parameters)
throws ServiceAccessException, ServiceParameterErrorException,
ServiceParameterMissingException {
String mapping = (String) parameters.get(MAPPING);
if (mapping == null)
throw new ServiceParameterMissingException(service, "Parameter "
+ MAPPING + " missing");
mappings = MappingSingleton.getInstance(mapping);
this.logger = logger;
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#checkAuthentication()
*/
public void checkAuthentication() throws UnauthenticatedException {
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#commit()
*/
public void commit() throws ServiceAccessException {
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#createFolder(java.lang.String)
*/
public void createFolder(String folderUri) throws ServiceAccessException,
AccessDeniedException, ObjectAlreadyExistsException,
ObjectLockedException {
logger.logInfo("Creating folder " + folderUri);
throw new AccessDeniedException("", "", "");
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#createResource(java.lang.String)
*/
public void createResource(String resourceUri)
throws ServiceAccessException, AccessDeniedException,
ObjectAlreadyExistsException, ObjectLockedException {
throw new AccessDeniedException("", "", "");
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#getChildrenNames(java.lang.String)
*/
public String[] getChildrenNames(String folderUri)
throws ServiceAccessException, AccessDeniedException,
ObjectNotFoundException, ObjectLockedException {
// don't allow to view contents of directory
return null;
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#getCreationDate(java.lang.String)
*/
public Date getCreationDate(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectNotFoundException,
ObjectLockedException {
Map map = mappings.loadMapping();
Date modified = null;
if (map.containsKey(uri)) {
String path = (String) map.get(uri);
File file = new File(path);
modified = new Date(file.lastModified());
}
return modified;
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#getLastModified(java.lang.String)
*/
public Date getLastModified(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectNotFoundException,
ObjectLockedException {
return getCreationDate(uri);
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#getResourceContent(java.lang.String)
*/
public InputStream getResourceContent(String resourceUri)
throws ServiceAccessException, AccessDeniedException,
ObjectNotFoundException, ObjectLockedException {
Map map = mappings.loadMapping();
if (map.containsKey(resourceUri)) {
String path = (String) map.get(resourceUri);
try {
FileInputStream fis = new FileInputStream(path);
return fis;
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
return null;
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#getResourceLength(java.lang.String)
*/
public long getResourceLength(String resourceUri)
throws ServiceAccessException, AccessDeniedException,
ObjectNotFoundException, ObjectLockedException {
Map map = mappings.loadMapping();
long length = 0;
if (map.containsKey(resourceUri)) {
String path = (String) map.get(resourceUri);
File file = new File(path);
length = file.length();
}
return length;
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#isFolder(java.lang.String)
*/
public boolean isFolder(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectLockedException {
logger.logInfo("isFolder " + uri);
return FILES.equals(uri);
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#isResource(java.lang.String)
*/
public boolean isResource(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectLockedException {
Map map = mappings.loadMapping();
return map.containsKey(uri);
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#objectExists(java.lang.String)
*/
public boolean objectExists(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectLockedException {
Map map = mappings.loadMapping();
logger.logInfo("objectExists " + uri);
return FILES.equals(uri) || map.containsKey(uri);
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#removeObject(java.lang.String)
*/
public void removeObject(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectNotFoundException,
ObjectLockedException {
throw new AccessDeniedException("", "", "");
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#rollback()
*/
public void rollback() throws ServiceAccessException {
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#setResourceContent(java.lang.String,
* java.io.InputStream, java.lang.String, java.lang.String)
*/
public void setResourceContent(String resourceUri, InputStream content,
String contentType, String characterEncoding)
throws ServiceAccessException, AccessDeniedException,
ObjectNotFoundException, ObjectLockedException {
// FIXME Auto-generated method stub
Map map = mappings.loadMapping();
if (map.containsKey(resourceUri)) {
String path = (String) map.get(resourceUri);
try {
FileOutputStream fos = new FileOutputStream(path);
byte[] buffer = new byte[1024 * 20];
int read = 0;
while ((read = content.read(buffer)) > 0)
fos.write(buffer, 0, read);
fos.flush();
fos.close();
content.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
but when I setup this store in Domain.xml, i'm getting exception:
15 Feb 2006 18:43:30 - org.apache.slide.common.XMLUnmarshaller - INFO - Loading object /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - objectExists /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - isFolder /files
15 Feb 2006 18:43:30 - org.apache.slide.common.XMLUnmarshaller - INFO - Object already exists at /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - objectExists /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - objectExists /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - objectExists /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - isFolder /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - objectExists /files
15 Feb 2006 18:43:30 - org.apache.slide.common.Domain - WARNING - Invalid object at : No content
15 Feb 2006 18:43:30 - org.apache.slide.common.Namespace - ERROR - Unable to read Namespace base configuration file :
15 Feb 2006 18:43:30 - org.apache.slide.common.Namespace - ERROR - org.apache.slide.common.ObjectValidationFailedException: Invalid object at : No content
org.apache.slide.common.ObjectValidationFailedException: Invalid object at : No content
I don't have "files" folder under the root store, basically I don't have root
folder in the store at all. I checked implementation of isFolder, isResource,
objectExists methods in sources for
org.apache.slide.simple.reference.WebdavFileStore
Could somebody please help?
--
Eugene N Dzhurinsky
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Re: Virtual FS store implementation for WCK
Posted by Eugeny N Dzhurinsky <eu...@jdevelop.com>.
On Wed, Feb 15, 2006 at 09:16:43AM -0800, Michael Oliver wrote:
> Eugeny,
>
> My advice would be not to change more than you need to change; Extend vs.
> create; and observe and modify instead of trying to build from scratch; take
> small steps from one known state to the next; and don't "fix" something that
> isn't broken.
>
> If you extend the Tx stores instead of starting from scratch, you will find
> you can change behaviors where you need to and leave everything else alone.
>
> I do not understand why you think you need to change the content /files
> root, you are making more work for yourself.
>
> If I create a web folder to http://localhost:8080/slide/files/mytargetroot/
> where "mytargetroot" is your root directory/folder/collection then your web
> folder won't show anything above it and /files will be hidden. All you will
> see in that web folder are the contents of mytargetroot.
Finally I found getResourceContent can't return null at all if Stream couln't
be obtained from resource. Instead of this store should throw
ObjectNotFoundException. Very tricky, as for me, and no points in
documentation. Sources rocks as usual :)
--
Eugene N Dzhurinsky
---------------------------------------------------------------------
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RE: Virtual FS store implementation for WCK
Posted by Michael Oliver <ol...@alariussystems.com>.
Eugeny,
My advice would be not to change more than you need to change; Extend vs.
create; and observe and modify instead of trying to build from scratch; take
small steps from one known state to the next; and don't "fix" something that
isn't broken.
If you extend the Tx stores instead of starting from scratch, you will find
you can change behaviors where you need to and leave everything else alone.
I do not understand why you think you need to change the content /files
root, you are making more work for yourself.
If I create a web folder to http://localhost:8080/slide/files/mytargetroot/
where "mytargetroot" is your root directory/folder/collection then your web
folder won't show anything above it and /files will be hidden. All you will
see in that web folder are the contents of mytargetroot.
Michael Oliver
CTO
Alarius Systems LLC
6800 E. Lake Mead Blvd, #1096
Las Vegas, NV 89156
Phone:(702)953-8949
Fax:(702)974-0341
-----Original Message-----
From: Eugeny N Dzhurinsky [mailto:eugenydzh@jdevelop.com]
Sent: Wednesday, February 15, 2006 8:50 AM
To: slide-user@jakarta.apache.org
Subject: Virtual FS store implementation for WCK
Sorry for asking so many dumb questions here, but I'm lost.
I'm trying to create virtual file system with no ability to create folders
and
list resources, but with ability to read and write to predefined resources.
Mapping between allowed resources and files on disk located in Map accessed
by
MappingSingleton (it's nothing except synchronized hashmap with disk file
storage
at the backend)
I created BasicWebdavStore implementation:
package webdav.store;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.security.Principal;
import java.util.Date;
import java.util.Hashtable;
import java.util.Map;
import org.apache.commons.transaction.util.LoggerFacade;
import org.apache.slide.common.Service;
import org.apache.slide.common.ServiceAccessException;
import org.apache.slide.common.ServiceParameterErrorException;
import org.apache.slide.common.ServiceParameterMissingException;
import org.apache.slide.lock.ObjectLockedException;
import org.apache.slide.security.AccessDeniedException;
import org.apache.slide.security.UnauthenticatedException;
import org.apache.slide.simple.store.BasicWebdavStore;
import org.apache.slide.structure.ObjectAlreadyExistsException;
import org.apache.slide.structure.ObjectNotFoundException;
/**
* Virtual filesystem store
*/
public class VirtualFileSystemStoreImpl implements BasicWebdavStore {
public static final String MAPPING = "mapping";
private static final String FILES = "/files";
private static LoggerFacade logger;
/**
* Mapping instance
*/
private MappingSingleton mappings;
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#begin(org.apache.slide.common
.Service,
* java.security.Principal, java.lang.Object,
* org.apache.commons.transaction.util.LoggerFacade,
* java.util.Hashtable)
*/
public void begin(Service service, Principal principal, Object
connection,
LoggerFacade logger, Hashtable parameters)
throws ServiceAccessException, ServiceParameterErrorException,
ServiceParameterMissingException {
String mapping = (String) parameters.get(MAPPING);
if (mapping == null)
throw new ServiceParameterMissingException(service, "Parameter "
+ MAPPING + " missing");
mappings = MappingSingleton.getInstance(mapping);
this.logger = logger;
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#checkAuthentication()
*/
public void checkAuthentication() throws UnauthenticatedException {
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#commit()
*/
public void commit() throws ServiceAccessException {
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#createFolder(java.lang.String
)
*/
public void createFolder(String folderUri) throws
ServiceAccessException,
AccessDeniedException, ObjectAlreadyExistsException,
ObjectLockedException {
logger.logInfo("Creating folder " + folderUri);
throw new AccessDeniedException("", "", "");
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#createResource(java.lang.Stri
ng)
*/
public void createResource(String resourceUri)
throws ServiceAccessException, AccessDeniedException,
ObjectAlreadyExistsException, ObjectLockedException {
throw new AccessDeniedException("", "", "");
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#getChildrenNames(java.lang.St
ring)
*/
public String[] getChildrenNames(String folderUri)
throws ServiceAccessException, AccessDeniedException,
ObjectNotFoundException, ObjectLockedException {
// don't allow to view contents of directory
return null;
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#getCreationDate(java.lang.Str
ing)
*/
public Date getCreationDate(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectNotFoundException,
ObjectLockedException {
Map map = mappings.loadMapping();
Date modified = null;
if (map.containsKey(uri)) {
String path = (String) map.get(uri);
File file = new File(path);
modified = new Date(file.lastModified());
}
return modified;
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#getLastModified(java.lang.Str
ing)
*/
public Date getLastModified(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectNotFoundException,
ObjectLockedException {
return getCreationDate(uri);
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#getResourceContent(java.lang.
String)
*/
public InputStream getResourceContent(String resourceUri)
throws ServiceAccessException, AccessDeniedException,
ObjectNotFoundException, ObjectLockedException {
Map map = mappings.loadMapping();
if (map.containsKey(resourceUri)) {
String path = (String) map.get(resourceUri);
try {
FileInputStream fis = new FileInputStream(path);
return fis;
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
return null;
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#getResourceLength(java.lang.S
tring)
*/
public long getResourceLength(String resourceUri)
throws ServiceAccessException, AccessDeniedException,
ObjectNotFoundException, ObjectLockedException {
Map map = mappings.loadMapping();
long length = 0;
if (map.containsKey(resourceUri)) {
String path = (String) map.get(resourceUri);
File file = new File(path);
length = file.length();
}
return length;
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#isFolder(java.lang.String)
*/
public boolean isFolder(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectLockedException {
logger.logInfo("isFolder " + uri);
return FILES.equals(uri);
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#isResource(java.lang.String)
*/
public boolean isResource(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectLockedException {
Map map = mappings.loadMapping();
return map.containsKey(uri);
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#objectExists(java.lang.String
)
*/
public boolean objectExists(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectLockedException {
Map map = mappings.loadMapping();
logger.logInfo("objectExists " + uri);
return FILES.equals(uri) || map.containsKey(uri);
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#removeObject(java.lang.String
)
*/
public void removeObject(String uri) throws ServiceAccessException,
AccessDeniedException, ObjectNotFoundException,
ObjectLockedException {
throw new AccessDeniedException("", "", "");
}
/**
* @see org.apache.slide.simple.store.BasicWebdavStore#rollback()
*/
public void rollback() throws ServiceAccessException {
}
/**
* @see
org.apache.slide.simple.store.BasicWebdavStore#setResourceContent(java.lang.
String,
* java.io.InputStream, java.lang.String, java.lang.String)
*/
public void setResourceContent(String resourceUri, InputStream content,
String contentType, String characterEncoding)
throws ServiceAccessException, AccessDeniedException,
ObjectNotFoundException, ObjectLockedException {
// FIXME Auto-generated method stub
Map map = mappings.loadMapping();
if (map.containsKey(resourceUri)) {
String path = (String) map.get(resourceUri);
try {
FileOutputStream fos = new FileOutputStream(path);
byte[] buffer = new byte[1024 * 20];
int read = 0;
while ((read = content.read(buffer)) > 0)
fos.write(buffer, 0, read);
fos.flush();
fos.close();
content.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
but when I setup this store in Domain.xml, i'm getting exception:
15 Feb 2006 18:43:30 - org.apache.slide.common.XMLUnmarshaller - INFO -
Loading object /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - objectExists /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - isFolder /files
15 Feb 2006 18:43:30 - org.apache.slide.common.XMLUnmarshaller - INFO -
Object already exists at /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - objectExists /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - objectExists /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - objectExists /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - isFolder /files
15 Feb 2006 18:43:30 - WebDAV store - INFO - objectExists /files
15 Feb 2006 18:43:30 - org.apache.slide.common.Domain - WARNING - Invalid
object at : No content
15 Feb 2006 18:43:30 - org.apache.slide.common.Namespace - ERROR - Unable to
read Namespace base configuration file :
15 Feb 2006 18:43:30 - org.apache.slide.common.Namespace - ERROR -
org.apache.slide.common.ObjectValidationFailedException: Invalid object at
: No content
org.apache.slide.common.ObjectValidationFailedException: Invalid object at
: No content
I don't have "files" folder under the root store, basically I don't have
root
folder in the store at all. I checked implementation of isFolder,
isResource,
objectExists methods in sources for
org.apache.slide.simple.reference.WebdavFileStore
Could somebody please help?
--
Eugene N Dzhurinsky
---------------------------------------------------------------------
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For additional commands, e-mail: slide-user-help@jakarta.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: slide-user-unsubscribe@jakarta.apache.org
For additional commands, e-mail: slide-user-help@jakarta.apache.org