org.eclipse.jetty.servlet.ServletHolder Maven / Gradle / Ivy
// ========================================================================
// Copyright (c) 1999-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package org.eclipse.jetty.servlet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Stack;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import org.eclipse.jetty.servlet.api.ServletRegistration;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.SingleThreadModel;
import javax.servlet.UnavailableException;
import org.eclipse.jetty.security.IdentityService;
import org.eclipse.jetty.security.RunAsToken;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.UserIdentity;
import org.eclipse.jetty.util.log.Log;
/* --------------------------------------------------------------------- */
/** Servlet Instance and Context Holder.
* Holds the name, params and some state of a javax.servlet.Servlet
* instance. It implements the ServletConfig interface.
* This class will organise the loading of the servlet when needed or
* requested.
*
*
*/
public class ServletHolder extends Holder implements UserIdentity.Scope, Comparable
{
/* ---------------------------------------------------------------- */
private int _initOrder;
private boolean _initOnStartup=false;
private Map _roleMap;
private String _forcedPath;
private String _runAsRole;
private RunAsToken _runAsToken;
private IdentityService _identityService;
private transient Servlet _servlet;
private transient Config _config;
private transient long _unavailable;
private transient UnavailableException _unavailableEx;
public static final Map NO_MAPPED_ROLES = Collections.emptyMap();
/* ---------------------------------------------------------------- */
/** Constructor .
*/
public ServletHolder()
{
}
/* ---------------------------------------------------------------- */
/** Constructor for existing servlet.
*/
public ServletHolder(Servlet servlet)
{
setServlet(servlet);
}
/* ---------------------------------------------------------------- */
/** Constructor for existing servlet.
*/
public ServletHolder(Class servlet)
{
setHeldClass(servlet);
}
/* ---------------------------------------------------------------- */
/**
* @return The unavailable exception or null if not unavailable
*/
public UnavailableException getUnavailableException()
{
return _unavailableEx;
}
/* ------------------------------------------------------------ */
public synchronized void setServlet(Servlet servlet)
{
if (servlet==null || servlet instanceof SingleThreadModel)
throw new IllegalArgumentException();
_extInstance=true;
_servlet=servlet;
setHeldClass(servlet.getClass());
if (getName()==null)
setName(servlet.getClass().getName()+"-"+super.hashCode());
}
/* ------------------------------------------------------------ */
public int getInitOrder()
{
return _initOrder;
}
/* ------------------------------------------------------------ */
/** Set the initialize order.
* Holders with order<0, are initialized on use. Those with
* order>=0 are initialized in increasing order when the handler
* is started.
*/
public void setInitOrder(int order)
{
_initOnStartup=true;
_initOrder = order;
}
public boolean isSetInitOrder()
{
return _initOnStartup;
}
/* ------------------------------------------------------------ */
/** Comparitor by init order.
*/
public int compareTo(Object o)
{
if (o instanceof ServletHolder)
{
ServletHolder sh= (ServletHolder)o;
if (sh==this)
return 0;
if (sh._initOrder<_initOrder)
return 1;
if (sh._initOrder>_initOrder)
return -1;
int c=(_className!=null && sh._className!=null)?_className.compareTo(sh._className):0;
if (c==0)
c=_name.compareTo(sh._name);
if (c==0)
c=this.hashCode()>o.hashCode()?1:-1;
return c;
}
return 1;
}
/* ------------------------------------------------------------ */
public boolean equals(Object o)
{
return compareTo(o)==0;
}
/* ------------------------------------------------------------ */
public int hashCode()
{
return _name==null?System.identityHashCode(this):_name.hashCode();
}
/* ------------------------------------------------------------ */
/** Link a user role.
* Translate the role name used by a servlet, to the link name
* used by the container.
* @param name The role name as used by the servlet
* @param link The role name as used by the container.
*/
public synchronized void setUserRoleLink(String name,String link)
{
if (_roleMap==null)
_roleMap=new HashMap();
_roleMap.put(name,link);
}
/* ------------------------------------------------------------ */
/** get a user role link.
* @param name The name of the role
* @return The name as translated by the link. If no link exists,
* the name is returned.
*/
public String getUserRoleLink(String name)
{
if (_roleMap==null)
return name;
String link= _roleMap.get(name);
return (link==null)?name:link;
}
/* ------------------------------------------------------------ */
public Map getRoleMap()
{
return _roleMap == null? NO_MAPPED_ROLES : _roleMap;
}
/* ------------------------------------------------------------ */
/**
* @return Returns the forcedPath.
*/
public String getForcedPath()
{
return _forcedPath;
}
/* ------------------------------------------------------------ */
/**
* @param forcedPath The forcedPath to set.
*/
public void setForcedPath(String forcedPath)
{
_forcedPath = forcedPath;
}
/* ------------------------------------------------------------ */
public void doStart()
throws Exception
{
_unavailable=0;
try
{
super.doStart();
checkServletType();
}
catch (UnavailableException ue)
{
makeUnavailable(ue);
}
_identityService = _servletHandler.getIdentityService();
if (_identityService!=null && _runAsRole!=null)
_runAsToken=_identityService.newRunAsToken(_runAsRole);
_config=new Config();
if (_class!=null && javax.servlet.SingleThreadModel.class.isAssignableFrom(_class))
_servlet = new SingleThreadedWrapper();
if (_extInstance || _initOnStartup)
{
try
{
initServlet();
}
catch(Exception e)
{
if (_servletHandler.isStartWithUnavailable())
Log.ignore(e);
else
throw e;
}
}
}
/* ------------------------------------------------------------ */
public void doStop()
throws Exception
{
Object old_run_as = null;
if (_servlet!=null)
{
try
{
if (_identityService!=null)
old_run_as=_identityService.setRunAs(_identityService.getSystemUserIdentity(),_runAsToken);
destroyInstance(_servlet);
}
catch (Exception e)
{
Log.warn(e);
}
finally
{
if (_identityService!=null)
_identityService.unsetRunAs(old_run_as);
}
}
if (!_extInstance)
_servlet=null;
_config=null;
}
/* ------------------------------------------------------------ */
public void destroyInstance (Object o)
throws Exception
{
if (o==null)
return;
Servlet servlet = ((Servlet)o);
servlet.destroy();
getServletHandler().destroyServlet(servlet);
}
/* ------------------------------------------------------------ */
/** Get the servlet.
* @return The servlet
*/
public synchronized Servlet getServlet()
throws ServletException
{
// Handle previous unavailability
if (_unavailable!=0)
{
if (_unavailable<0 || _unavailable>0 && System.currentTimeMillis()<_unavailable)
throw _unavailableEx;
_unavailable=0;
_unavailableEx=null;
}
if (_servlet==null)
initServlet();
return _servlet;
}
/* ------------------------------------------------------------ */
/** Get the servlet instance (no initialization done).
* @return The servlet or null
*/
public Servlet getServletInstance()
{
return _servlet;
}
/* ------------------------------------------------------------ */
/**
* Check to ensure class of servlet is acceptable.
* @throws UnavailableException
*/
public void checkServletType ()
throws UnavailableException
{
if (_class==null || !javax.servlet.Servlet.class.isAssignableFrom(_class))
{
throw new UnavailableException("Servlet "+_class+" is not a javax.servlet.Servlet");
}
}
/* ------------------------------------------------------------ */
/**
* @return true if the holder is started and is not unavailable
*/
public boolean isAvailable()
{
if (isStarted()&& _unavailable==0)
return true;
try
{
getServlet();
}
catch(Exception e)
{
Log.ignore(e);
}
return isStarted()&& _unavailable==0;
}
/* ------------------------------------------------------------ */
private void makeUnavailable(UnavailableException e)
{
if (_unavailableEx==e && _unavailable!=0)
return;
_servletHandler.getServletContext().log("unavailable",e);
_unavailableEx=e;
_unavailable=-1;
if (e.isPermanent())
_unavailable=-1;
else
{
if (_unavailableEx.getUnavailableSeconds()>0)
_unavailable=System.currentTimeMillis()+1000*_unavailableEx.getUnavailableSeconds();
else
_unavailable=System.currentTimeMillis()+5000; // TODO configure
}
}
/* ------------------------------------------------------------ */
private void makeUnavailable(Throwable e)
{
if (e instanceof UnavailableException)
makeUnavailable((UnavailableException)e);
else
{
_servletHandler.getServletContext().log("unavailable",e);
_unavailableEx=new UnavailableException(e.toString(),-1);
_unavailable=-1;
}
}
/* ------------------------------------------------------------ */
private void initServlet()
throws ServletException
{
Object old_run_as = null;
try
{
if (_servlet==null)
_servlet=newInstance();
if (_config==null)
_config=new Config();
// Handle run as
if (_identityService!=null)
{
old_run_as=_identityService.setRunAs(_identityService.getSystemUserIdentity(),_runAsToken);
}
_servlet.init(_config);
}
catch (UnavailableException e)
{
makeUnavailable(e);
_servlet=null;
_config=null;
throw e;
}
catch (ServletException e)
{
makeUnavailable(e.getCause()==null?e:e.getCause());
_servlet=null;
_config=null;
throw e;
}
catch (Exception e)
{
makeUnavailable(e);
_servlet=null;
_config=null;
throw new ServletException(this.toString(),e);
}
finally
{
// pop run-as role
if (_identityService!=null)
_identityService.unsetRunAs(old_run_as);
}
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.server.UserIdentity.Scope#getContextPath()
*/
public String getContextPath()
{
return _config.getServletContext().getContextPath();
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.server.UserIdentity.Scope#getRoleRefMap()
*/
public Map getRoleRefMap()
{
return _roleMap;
}
/* ------------------------------------------------------------ */
public String getRunAsRole()
{
return _runAsRole;
}
/* ------------------------------------------------------------ */
public void setRunAsRole(String role)
{
_runAsRole = role;
}
/* ------------------------------------------------------------ */
/** Service a request with this servlet.
*/
public void handle(Request baseRequest,
ServletRequest request,
ServletResponse response)
throws ServletException,
UnavailableException,
IOException
{
if (_class==null)
throw new UnavailableException("Servlet Not Initialized");
Servlet servlet=_servlet;
synchronized(this)
{
if (_unavailable!=0 || !_initOnStartup)
servlet=getServlet();
if (servlet==null)
throw new UnavailableException("Could not instantiate "+_class);
}
// Service the request
boolean servlet_error=true;
Object old_run_as = null;
boolean suspendable = baseRequest.isAsyncSupported();
try
{
// Handle aliased path
if (_forcedPath!=null)
// TODO complain about poor naming to the Jasper folks
request.setAttribute("org.apache.catalina.jsp_file",_forcedPath);
// Handle run as
if (_identityService!=null)
old_run_as=_identityService.setRunAs(baseRequest.getResolvedUserIdentity(),_runAsToken);
if (!isAsyncSupported())
baseRequest.setAsyncSupported(false);
servlet.service(request,response);
servlet_error=false;
}
catch(UnavailableException e)
{
makeUnavailable(e);
throw _unavailableEx;
}
finally
{
baseRequest.setAsyncSupported(suspendable);
// pop run-as role
if (_identityService!=null)
_identityService.unsetRunAs(old_run_as);
// Handle error params.
if (servlet_error)
request.setAttribute("javax.servlet.error.servlet_name",getName());
}
}
/* ------------------------------------------------------------ */
/* ------------------------------------------------------------ */
/* ------------------------------------------------------------ */
protected class Config extends HolderConfig implements ServletConfig
{
/* -------------------------------------------------------- */
public String getServletName()
{
return getName();
}
}
/* -------------------------------------------------------- */
/* -------------------------------------------------------- */
/* -------------------------------------------------------- */
public class Registration extends HolderRegistration implements ServletRegistration.Dynamic
{
public Set addMapping(String... urlPatterns)
{
illegalStateIfContextStarted();
Set clash=null;
for (String pattern : urlPatterns)
{
if (_servletHandler.getServletMapping(pattern)!=null)
{
if (clash==null)
clash=new HashSet();
clash.add(pattern);
}
}
if (clash!=null)
return clash;
ServletMapping mapping = new ServletMapping();
mapping.setServletName(ServletHolder.this.getName());
mapping.setPathSpecs(urlPatterns);
_servletHandler.addServletMapping(mapping);
return Collections.emptySet();
}
public Collection getMappings()
{
ServletMapping[] mappings =_servletHandler.getServletMappings();
List patterns=new ArrayList();
for (ServletMapping mapping : mappings)
{
if (!mapping.getServletName().equals(getName()))
continue;
String[] specs=mapping.getPathSpecs();
if (specs!=null && specs.length>0)
patterns.addAll(Arrays.asList(specs));
}
return patterns;
}
public String getRunAsRole()
{
return _runAsRole;
}
public void setLoadOnStartup(int loadOnStartup)
{
illegalStateIfContextStarted();
ServletHolder.this.setInitOrder(loadOnStartup);
}
public int getInitOrder()
{
return ServletHolder.this.getInitOrder();
}
public void setRunAsRole(String role)
{
_runAsRole = role;
}
}
public ServletRegistration.Dynamic getRegistration()
{
return new Registration();
}
/* -------------------------------------------------------- */
/* -------------------------------------------------------- */
/* -------------------------------------------------------- */
private class SingleThreadedWrapper implements Servlet
{
Stack _stack=new Stack();
public void destroy()
{
synchronized(this)
{
while(_stack.size()>0)
try { (_stack.pop()).destroy(); } catch (Exception e) { Log.warn(e); }
}
}
public ServletConfig getServletConfig()
{
return _config;
}
public String getServletInfo()
{
return null;
}
public void init(ServletConfig config) throws ServletException
{
synchronized(this)
{
if(_stack.size()==0)
{
try
{
Servlet s = newInstance();
s.init(config);
_stack.push(s);
}
catch (ServletException e)
{
throw e;
}
catch (Exception e)
{
throw new ServletException(e);
}
}
}
}
public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException
{
Servlet s;
synchronized(this)
{
if(_stack.size()>0)
s=(Servlet)_stack.pop();
else
{
try
{
s = newInstance();
s.init(_config);
}
catch (ServletException e)
{
throw e;
}
catch (Exception e)
{
throw new ServletException(e);
}
}
}
try
{
s.service(req,res);
}
finally
{
synchronized(this)
{
_stack.push(s);
}
}
}
}
/* ------------------------------------------------------------ */
/**
* @return
* @throws ServletException
* @throws IllegalAccessException
* @throws InstantiationException
*/
protected Servlet newInstance() throws ServletException, IllegalAccessException, InstantiationException
{
try
{
return ((ServletContextHandler.Context)getServletHandler().getServletContext()).createServlet(getHeldClass());
}
catch (ServletException se)
{
Throwable cause = se.getRootCause();
if (cause instanceof InstantiationException)
throw (InstantiationException)cause;
if (cause instanceof IllegalAccessException)
throw (IllegalAccessException)cause;
throw se;
}
}
}