/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.myfaces.renderkit;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import org.apache.commons.collections.map.AbstractReferenceMap;
import org.apache.commons.collections.map.ReferenceMap;
import org.apache.myfaces.application.StateCache;
import org.apache.myfaces.buildtools.maven2.plugin.builder.annotation.JSFWebConfigParam;
import org.apache.myfaces.shared.renderkit.RendererUtils;
import org.apache.myfaces.shared.util.MyFacesObjectInputStream;
import org.apache.myfaces.shared.util.WebConfigParamUtils;
class ServerSideStateCacheImpl extends StateCache<Object, Object>
{
private static final Logger log = Logger.getLogger(ServerSideStateCacheImpl.class.getName());
private static final String SERIALIZED_VIEW_SESSION_ATTR=
ServerSideStateCacheImpl.class.getName() + ".SERIALIZED_VIEW";
private static final String RESTORED_SERIALIZED_VIEW_REQUEST_ATTR =
ServerSideStateCacheImpl.class.getName() + ".RESTORED_SERIALIZED_VIEW";
private static final String RESTORED_VIEW_KEY_REQUEST_ATTR =
ServerSideStateCacheImpl.class.getName() + ".RESTORED_VIEW_KEY";
/**
* Defines the amount (default = 20) of the latest views are stored in session.
*
* <p>Only applicable if state saving method is "server" (= default).
* </p>
*
*/
@JSFWebConfigParam(defaultValue="20",since="1.1", classType="java.lang.Integer", group="state", tags="performance")
private static final String NUMBER_OF_VIEWS_IN_SESSION_PARAM = "org.apache.myfaces.NUMBER_OF_VIEWS_IN_SESSION";
/**
* Indicates the amount of views (default is not active) that should be stored in session between sequential
* POST or POST-REDIRECT-GET if org.apache.myfaces.USE_FLASH_SCOPE_PURGE_VIEWS_IN_SESSION is true.
*
* <p>Only applicable if state saving method is "server" (= default). For example, if this param has value = 2 and
* in your custom webapp there is a form that is clicked 3 times, only 2 views
* will be stored and the third one (the one stored the first time) will be
* removed from session, even if the view can
* store more sessions org.apache.myfaces.NUMBER_OF_VIEWS_IN_SESSION.
* This feature becomes useful for multi-window applications.
* where without this feature a window can swallow all view slots so
* the other ones will throw ViewExpiredException.</p>
*/
@JSFWebConfigParam(since="2.0.6", classType="java.lang.Integer", group="state", tags="performance")
private static final String NUMBER_OF_SEQUENTIAL_VIEWS_IN_SESSION_PARAM
= "org.apache.myfaces.NUMBER_OF_SEQUENTIAL_VIEWS_IN_SESSION";
/**
* Default value for <code>org.apache.myfaces.NUMBER_OF_VIEWS_IN_SESSION</code> context parameter.
*/
private static final int DEFAULT_NUMBER_OF_VIEWS_IN_SESSION = 20;
/**
* Indicate if the state should be serialized before save it on the session.
* <p>
* Only applicable if state saving method is "server" (= default).
* If <code>true</code> (default) the state will be serialized to a byte stream before it is written to the session.
* If <code>false</code> the state will not be serialized to a byte stream.
* </p>
*/
@JSFWebConfigParam(defaultValue="true",since="1.1", expectedValues="true,false", group="state", tags="performance")
private static final String SERIALIZE_STATE_IN_SESSION_PARAM = "org.apache.myfaces.SERIALIZE_STATE_IN_SESSION";
/**
* Indicates that the serialized state will be compressed before it is written to the session. By default true.
*
* Only applicable if state saving method is "server" (= default) and if
* <code>org.apache.myfaces.SERIALIZE_STATE_IN_SESSION</code> is <code>true</code> (= default).
* If <code>true</code> (default) the serialized state will be compressed before it is written to the session.
* If <code>false</code> the state will not be compressed.
*/
@JSFWebConfigParam(defaultValue="true",since="1.1", expectedValues="true,false", group="state", tags="performance")
private static final String COMPRESS_SERVER_STATE_PARAM = "org.apache.myfaces.COMPRESS_STATE_IN_SESSION";
/**
* Default value for <code>org.apache.myfaces.COMPRESS_STATE_IN_SESSION</code> context parameter.
*/
private static final boolean DEFAULT_COMPRESS_SERVER_STATE_PARAM = true;
/**
* Default value for <code>org.apache.myfaces.SERIALIZE_STATE_IN_SESSION</code> context parameter.
*/
private static final boolean DEFAULT_SERIALIZE_STATE_IN_SESSION = true;
/**
* Define the way of handle old view references(views removed from session), making possible to
* store it in a cache, so the state manager first try to get the view from the session. If is it
* not found and soft or weak ReferenceMap is used, it try to get from it.
* <p>
* Only applicable if state saving method is "server" (= default).
* </p>
* <p>
* The gc is responsible for remove the views, according to the rules used for soft, weak or phantom
* references. If a key in soft and weak mode is garbage collected, its values are purged.
* </p>
* <p>
* By default no cache is used, so views removed from session became phantom references.
* </p>
* <ul>
* <li> off, no: default, no cache is used</li>
* <li> hard-soft: use an ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.SOFT)</li>
* <li> soft: use an ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.SOFT, true) </li>
* <li> soft-weak: use an ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.WEAK, true) </li>
* <li> weak: use an ReferenceMap(AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK, true) </li>
* </ul>
*
*/
@JSFWebConfigParam(defaultValue="off", expectedValues="off, no, hard-soft, soft, soft-weak, weak",
since="1.2.5", group="state", tags="performance")
private static final String CACHE_OLD_VIEWS_IN_SESSION_MODE = "org.apache.myfaces.CACHE_OLD_VIEWS_IN_SESSION_MODE";
/**
* This option uses an hard-soft ReferenceMap, but it could cause a
* memory leak, because the keys are not removed by any method
* (MYFACES-1660). So use with caution.
*/
private static final String CACHE_OLD_VIEWS_IN_SESSION_MODE_HARD_SOFT = "hard-soft";
private static final String CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT = "soft";
private static final String CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT_WEAK = "soft-weak";
private static final String CACHE_OLD_VIEWS_IN_SESSION_MODE_WEAK = "weak";
private static final String CACHE_OLD_VIEWS_IN_SESSION_MODE_OFF = "off";
/**
* Allow use flash scope to keep track of the views used in session and the previous ones,
* so server side state saving can delete old views even if POST-REDIRECT-GET pattern is used.
*
* <p>
* Only applicable if state saving method is "server" (= default).
* The default value is false.</p>
*/
@JSFWebConfigParam(since="2.0.6", defaultValue="false", expectedValues="true, false", group="state")
private static final String USE_FLASH_SCOPE_PURGE_VIEWS_IN_SESSION
= "org.apache.myfaces.USE_FLASH_SCOPE_PURGE_VIEWS_IN_SESSION";
private static final int UNCOMPRESSED_FLAG = 0;
private static final int COMPRESSED_FLAG = 1;
private static final int JSF_SEQUENCE_INDEX = 0;
private Boolean _useFlashScopePurgeViewsInSession = null;
private Integer _numberOfSequentialViewsInSession = null;
private boolean _numberOfSequentialViewsInSessionSet = false;
//------------------------------------- METHODS COPIED FROM JspStateManagerImpl--------------------------------
protected Integer getServerStateId(Object[] state)
{
if (state != null)
{
Object serverStateId = state[JSF_SEQUENCE_INDEX];
if (serverStateId != null)
{
return Integer.valueOf((String) serverStateId, Character.MAX_RADIX);
}
}
return null;
}
protected void saveSerializedViewInServletSession(FacesContext context,
Object serializedView)
{
Map<String, Object> sessionMap = context.getExternalContext().getSessionMap();
SerializedViewCollection viewCollection = (SerializedViewCollection) sessionMap
.get(SERIALIZED_VIEW_SESSION_ATTR);
if (viewCollection == null)
{
viewCollection = new SerializedViewCollection();
sessionMap.put(SERIALIZED_VIEW_SESSION_ATTR, viewCollection);
}
Map<Object,Object> attributeMap = context.getAttributes();
SerializedViewKey key = null;
if (getNumberOfSequentialViewsInSession(context.getExternalContext()) != null &&
getNumberOfSequentialViewsInSession(context.getExternalContext()) > 0)
{
key = (SerializedViewKey) attributeMap.get(RESTORED_VIEW_KEY_REQUEST_ATTR);
if (key == null )
{
if (isUseFlashScopePurgeViewsInSession(context.getExternalContext()) &&
Boolean.TRUE.equals(context.getExternalContext().getRequestMap()
.get("oam.Flash.REDIRECT.PREVIOUSREQUEST")))
{
key = (SerializedViewKey)
context.getExternalContext().getFlash().get(RESTORED_VIEW_KEY_REQUEST_ATTR);
}
}
}
viewCollection.add(context, serializeView(context, serializedView), getNextViewSequence(context), key);
/*
if (isUseFlashScopePurgeViewsInSession(context.getExternalContext()) &&
context.getExternalContext().getFlash().isRedirect())
{
context.getExternalContext().getFlash().put(RESTORED_VIEW_KEY_REQUEST_ATTR, new SerializedViewKey(context));
context.getExternalContext().getFlash().keep(RESTORED_VIEW_KEY_REQUEST_ATTR);
}*/
// replace the value to notify the container about the change
sessionMap.put(SERIALIZED_VIEW_SESSION_ATTR, viewCollection);
}
protected Object getSerializedViewFromServletSession(FacesContext context, String viewId, Integer sequence)
{
ExternalContext externalContext = context.getExternalContext();
Map<Object, Object> attributeMap = context.getAttributes();
Object serializedView = null;
if (attributeMap.containsKey(RESTORED_SERIALIZED_VIEW_REQUEST_ATTR))
{
serializedView = attributeMap.get(RESTORED_SERIALIZED_VIEW_REQUEST_ATTR);
}
else
{
SerializedViewCollection viewCollection = (SerializedViewCollection) externalContext
.getSessionMap().get(SERIALIZED_VIEW_SESSION_ATTR);
if (viewCollection != null)
{
/*
String sequenceStr = externalContext.getRequestParameterMap().get(
RendererUtils.SEQUENCE_PARAM);
Integer sequence = null;
if (sequenceStr == null)
{
// use latest sequence
Map map = externalContext.getSessionMap();
sequence = (Integer) map.get(RendererUtils.SEQUENCE_PARAM);
}
else
{
sequence = new Integer(sequenceStr);
}
*/
if (sequence != null)
{
Object state = viewCollection.get(sequence, viewId);
if (state != null)
{
serializedView = deserializeView(state);
}
}
}
attributeMap.put(RESTORED_SERIALIZED_VIEW_REQUEST_ATTR, serializedView);
if (getNumberOfSequentialViewsInSession(externalContext) != null &&
getNumberOfSequentialViewsInSession(externalContext) > 0)
{
SerializedViewKey key = new SerializedViewKey(viewId, sequence);
attributeMap.put(RESTORED_VIEW_KEY_REQUEST_ATTR, key);
if (isUseFlashScopePurgeViewsInSession(externalContext))
{
externalContext.getFlash().put(RESTORED_VIEW_KEY_REQUEST_ATTR, key);
externalContext.getFlash().keep(RESTORED_VIEW_KEY_REQUEST_ATTR);
}
}
nextViewSequence(context);
}
return serializedView;
}
public int getNextViewSequence(FacesContext context)
{
if (!context.getAttributes().containsKey(RendererUtils.SEQUENCE_PARAM))
{
nextViewSequence(context);
}
Integer sequence = (Integer) context.getAttributes().get(RendererUtils.SEQUENCE_PARAM);
return sequence.intValue();
}
public void nextViewSequence(FacesContext facescontext)
{
ExternalContext externalContext = facescontext.getExternalContext();
Object sessionObj = externalContext.getSession(true);
Integer sequence = null;
synchronized(sessionObj) // synchronized to increase sequence if multiple requests
// are handled at the same time for the session
{
Map<String, Object> map = externalContext.getSessionMap();
sequence = (Integer) map.get(RendererUtils.SEQUENCE_PARAM);
if(sequence == null || sequence.intValue() == Integer.MAX_VALUE)
{
sequence = Integer.valueOf(1);
}
else
{
sequence = Integer.valueOf(sequence.intValue() + 1);
}
map.put(RendererUtils.SEQUENCE_PARAM, sequence);
}
facescontext.getAttributes().put(RendererUtils.SEQUENCE_PARAM, sequence);
}
protected Object serializeView(FacesContext context, Object serializedView)
{
if (log.isLoggable(Level.FINEST))
{
log.finest("Entering serializeView");
}
if(isSerializeStateInSession(context))
{
if (log.isLoggable(Level.FINEST))
{
log.finest("Processing serializeView - serialize state in session");
}
ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
try
{
OutputStream os = baos;
if(isCompressStateInSession(context))
{
if (log.isLoggable(Level.FINEST))
{
log.finest("Processing serializeView - serialize compressed");
}
os.write(COMPRESSED_FLAG);
os = new GZIPOutputStream(os, 1024);
}
else
{
if (log.isLoggable(Level.FINEST))
{
log.finest("Processing serializeView - serialize uncompressed");
}
os.write(UNCOMPRESSED_FLAG);
}
//Object[] stateArray = (Object[]) serializedView;
ObjectOutputStream out = new ObjectOutputStream(os);
out.writeObject(serializedView);
//out.writeObject(stateArray[0]);
//out.writeObject(stateArray[1]);
out.close();
baos.close();
if (log.isLoggable(Level.FINEST))
{
log.finest("Exiting serializeView - serialized. Bytes : " + baos.size());
}
return baos.toByteArray();
}
catch (IOException e)
{
log.log(Level.SEVERE, "Exiting serializeView - Could not serialize state: " + e.getMessage(), e);
return null;
}
}
if (log.isLoggable(Level.FINEST))
{
log.finest("Exiting serializeView - do not serialize state in session.");
}
return serializedView;
}
/**
* Reads the value of the <code>org.apache.myfaces.SERIALIZE_STATE_IN_SESSION</code> context parameter.
* @see #SERIALIZE_STATE_IN_SESSION_PARAM
* @param context <code>FacesContext</code> for the request we are processing.
* @return boolean true, if the server state should be serialized in the session
*/
protected boolean isSerializeStateInSession(FacesContext context)
{
String value = context.getExternalContext().getInitParameter(
SERIALIZE_STATE_IN_SESSION_PARAM);
boolean serialize = DEFAULT_SERIALIZE_STATE_IN_SESSION;
if (value != null)
{
serialize = Boolean.valueOf(value);
}
return serialize;
}
/**
* Reads the value of the <code>org.apache.myfaces.COMPRESS_STATE_IN_SESSION</code> context parameter.
* @see #COMPRESS_SERVER_STATE_PARAM
* @param context <code>FacesContext</code> for the request we are processing.
* @return boolean true, if the server state steam should be compressed
*/
protected boolean isCompressStateInSession(FacesContext context)
{
String value = context.getExternalContext().getInitParameter(
COMPRESS_SERVER_STATE_PARAM);
boolean compress = DEFAULT_COMPRESS_SERVER_STATE_PARAM;
if (value != null)
{
compress = Boolean.valueOf(value);
}
return compress;
}
protected Object deserializeView(Object state)
{
if (log.isLoggable(Level.FINEST))
{
log.finest("Entering deserializeView");
}
if(state instanceof byte[])
{
if (log.isLoggable(Level.FINEST))
{
log.finest("Processing deserializeView - deserializing serialized state. Bytes : "
+ ((byte[]) state).length);
}
try
{
ByteArrayInputStream bais = new ByteArrayInputStream((byte[]) state);
InputStream is = bais;
if(is.read() == COMPRESSED_FLAG)
{
is = new GZIPInputStream(is);
}
ObjectInputStream ois = null;
try
{
final ObjectInputStream in = new MyFacesObjectInputStream(is);
ois = in;
Object object = null;
if (System.getSecurityManager() != null)
{
object = AccessController.doPrivileged(new PrivilegedExceptionAction<Object>()
{
public Object run() throws PrivilegedActionException, IOException, ClassNotFoundException
{
//return new Object[] {in.readObject(), in.readObject()};
return in.readObject();
}
});
}
else
{
//object = new Object[] {in.readObject(), in.readObject()};
object = in.readObject();
}
return object;
}
finally
{
if (ois != null)
{
ois.close();
ois = null;
}
}
}
catch (PrivilegedActionException e)
{
log.log(Level.SEVERE, "Exiting deserializeView - Could not deserialize state: " + e.getMessage(), e);
return null;
}
catch (IOException e)
{
log.log(Level.SEVERE, "Exiting deserializeView - Could not deserialize state: " + e.getMessage(), e);
return null;
}
catch (ClassNotFoundException e)
{
log.log(Level.SEVERE, "Exiting deserializeView - Could not deserialize state: " + e.getMessage(), e);
return null;
}
}
else if (state instanceof Object[])
{
if (log.isLoggable(Level.FINEST))
{
log.finest("Exiting deserializeView - state not serialized.");
}
return state;
}
else if(state == null)
{
log.severe("Exiting deserializeView - this method should not be called with a null-state.");
return null;
}
else
{
log.severe("Exiting deserializeView - this method should not be called with a state of type : "
+ state.getClass());
return null;
}
}
/*
public static Integer getViewSequence(FacesContext facescontext)
{
Map map = facescontext.getExternalContext().getRequestMap();
Integer sequence = (Integer) map.get(RendererUtils.SEQUENCE_PARAM);
if (sequence == null)
{
sequence = new Integer(1);
map.put(RendererUtils.SEQUENCE_PARAM, sequence);
synchronized (facescontext.getExternalContext().getSession(true))
{
facescontext.getExternalContext().getSessionMap().put(RendererUtils.SEQUENCE_PARAM, sequence);
}
}
return sequence;
}*/
protected static class SerializedViewCollection implements Serializable
{
private static final long serialVersionUID = -3734849062185115847L;
private final List<SerializedViewKey> _keys
= new ArrayList<SerializedViewKey>(DEFAULT_NUMBER_OF_VIEWS_IN_SESSION);
private final Map<SerializedViewKey, Object> _serializedViews = new HashMap<SerializedViewKey, Object>();
private final Map<SerializedViewKey, SerializedViewKey> _precedence =
new HashMap<SerializedViewKey, SerializedViewKey>();
// old views will be hold as soft references which will be removed by
// the garbage collector if free memory is low
private transient Map<Object, Object> _oldSerializedViews = null;
public synchronized void add(FacesContext context, Object state, Integer nextSequence,
SerializedViewKey previousRestoredKey)
{
SerializedViewKey key = new SerializedViewKey(context.getViewRoot().getViewId(), nextSequence);
_serializedViews.put(key, state);
Integer maxCount = getNumberOfSequentialViewsInSession(context);
if (maxCount != null)
{
if (previousRestoredKey != null)
{
_precedence.put((SerializedViewKey) key, previousRestoredKey);
}
}
while (_keys.remove(key))
{
// do nothing
}
_keys.add(key);
if (previousRestoredKey != null && maxCount != null && maxCount > 0)
{
int count = 0;
SerializedViewKey previousKey = (SerializedViewKey) key;
do
{
previousKey = _precedence.get(previousKey);
count++;
} while (previousKey != null && count < maxCount);
if (previousKey != null)
{
SerializedViewKey keyToRemove = (SerializedViewKey) previousKey;
// In theory it should be only one key but just to be sure
// do it in a loop, but in this case if cache old views is on,
// put on that map.
do
{
while (_keys.remove(keyToRemove))
{
// do nothing
}
Object oldView = _serializedViews.remove(keyToRemove);
if (oldView != null &&
!CACHE_OLD_VIEWS_IN_SESSION_MODE_OFF.equals(getCacheOldViewsInSessionMode(context)))
{
getOldSerializedViewsMap().put(keyToRemove, oldView);
}
keyToRemove = _precedence.remove(keyToRemove);
} while(keyToRemove != null);
}
}
int views = getNumberOfViewsInSession(context);
while (_keys.size() > views)
{
key = _keys.remove(0);
if (maxCount != null && maxCount > 0)
{
SerializedViewKey keyToRemove = (SerializedViewKey) key;
// Note in this case the key to delete is the oldest one,
// so it could be at least one precedence, but to be safe
// do it with a loop.
do
{
keyToRemove = _precedence.remove(keyToRemove);
} while (keyToRemove != null);
}
Object oldView = _serializedViews.remove(key);
if (oldView != null &&
!CACHE_OLD_VIEWS_IN_SESSION_MODE_OFF.equals(getCacheOldViewsInSessionMode(context)))
{
getOldSerializedViewsMap().put(key, oldView);
}
}
}
protected Integer getNumberOfSequentialViewsInSession(FacesContext context)
{
return WebConfigParamUtils.getIntegerInitParameter(context.getExternalContext(),
NUMBER_OF_SEQUENTIAL_VIEWS_IN_SESSION_PARAM);
}
/**
* Reads the amount (default = 20) of views to be stored in session.
* @see #NUMBER_OF_VIEWS_IN_SESSION_PARAM
* @param context FacesContext for the current request, we are processing
* @return Number vf views stored in the session
*/
protected int getNumberOfViewsInSession(FacesContext context)
{
String value = context.getExternalContext().getInitParameter(
NUMBER_OF_VIEWS_IN_SESSION_PARAM);
int views = DEFAULT_NUMBER_OF_VIEWS_IN_SESSION;
if (value != null)
{
try
{
views = Integer.parseInt(value);
if (views <= 0)
{
log.severe("Configured value for " + NUMBER_OF_VIEWS_IN_SESSION_PARAM
+ " is not valid, must be an value > 0, using default value ("
+ DEFAULT_NUMBER_OF_VIEWS_IN_SESSION);
views = DEFAULT_NUMBER_OF_VIEWS_IN_SESSION;
}
}
catch (Throwable e)
{
log.log(Level.SEVERE, "Error determining the value for " + NUMBER_OF_VIEWS_IN_SESSION_PARAM
+ ", expected an integer value > 0, using default value ("
+ DEFAULT_NUMBER_OF_VIEWS_IN_SESSION + "): " + e.getMessage(), e);
}
}
return views;
}
/**
* @return old serialized views map
*/
@SuppressWarnings("unchecked")
protected Map<Object, Object> getOldSerializedViewsMap()
{
FacesContext context = FacesContext.getCurrentInstance();
if (_oldSerializedViews == null && context != null)
{
String cacheMode = getCacheOldViewsInSessionMode(context);
if (CACHE_OLD_VIEWS_IN_SESSION_MODE_WEAK.equals(cacheMode))
{
_oldSerializedViews = new ReferenceMap(AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK, true);
}
else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT_WEAK.equals(cacheMode))
{
_oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.WEAK, true);
}
else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT.equals(cacheMode))
{
_oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.SOFT, true);
}
else if (CACHE_OLD_VIEWS_IN_SESSION_MODE_HARD_SOFT.equals(cacheMode))
{
_oldSerializedViews = new ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.SOFT);
}
}
return _oldSerializedViews;
}
/**
* Reads the value of the <code>org.apache.myfaces.CACHE_OLD_VIEWS_IN_SESSION_MODE</code> context parameter.
*
* @since 1.2.5
* @param context
* @return constant indicating caching mode
* @see #CACHE_OLD_VIEWS_IN_SESSION_MODE
*/
protected String getCacheOldViewsInSessionMode(FacesContext context)
{
String value = context.getExternalContext().getInitParameter(
CACHE_OLD_VIEWS_IN_SESSION_MODE);
if (value == null)
{
return CACHE_OLD_VIEWS_IN_SESSION_MODE_OFF;
}
else if (value.equalsIgnoreCase(CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT))
{
return CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT;
}
else if (value.equalsIgnoreCase(CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT_WEAK))
{
return CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT_WEAK;
}
else if (value.equalsIgnoreCase(CACHE_OLD_VIEWS_IN_SESSION_MODE_WEAK))
{
return CACHE_OLD_VIEWS_IN_SESSION_MODE_WEAK;
}
else if (value.equalsIgnoreCase(CACHE_OLD_VIEWS_IN_SESSION_MODE_HARD_SOFT))
{
return CACHE_OLD_VIEWS_IN_SESSION_MODE_HARD_SOFT;
}
else
{
return CACHE_OLD_VIEWS_IN_SESSION_MODE_OFF;
}
}
public Object get(Integer sequence, String viewId)
{
Object key = new SerializedViewKey(viewId, sequence);
Object value = _serializedViews.get(key);
if (value == null)
{
Map<Object,Object> oldSerializedViewMap = getOldSerializedViewsMap();
if (oldSerializedViewMap != null)
{
value = oldSerializedViewMap.get(key);
}
}
return value;
}
}
protected static class SerializedViewKey implements Serializable
{
private static final long serialVersionUID = -1170697124386063642L;
private final String _viewId;
private final Integer _sequenceId;
public SerializedViewKey(String viewId, Integer sequence)
{
_sequenceId = sequence;
_viewId = viewId;
}
/*
public SerializedViewKey(FacesContext context)
{
_sequenceId = getNextViewSequence(context);
_viewId = context.getViewRoot().getViewId();
}*/
@Override
public int hashCode()
{
final int prime = 31;
int result = 1;
result = prime * result + ((_sequenceId == null) ? 0 : _sequenceId.hashCode());
result = prime * result + ((_viewId == null) ? 0 : _viewId.hashCode());
return result;
}
@Override
public boolean equals(Object obj)
{
if (this == obj)
{
return true;
}
if (obj == null)
{
return false;
}
if (getClass() != obj.getClass())
{
return false;
}
final SerializedViewKey other = (SerializedViewKey) obj;
if (_sequenceId == null)
{
if (other._sequenceId != null)
{
return false;
}
}
else if (!_sequenceId.equals(other._sequenceId))
{
return false;
}
if (_viewId == null)
{
if (other._viewId != null)
{
return false;
}
}
else if (!_viewId.equals(other._viewId))
{
return false;
}
return true;
}
}
//------------------------------------- METHOD FROM StateCache ------------------------------------------------
@Override
public Object saveSerializedView(FacesContext facesContext, Object serializedView)
{
if (log.isLoggable(Level.FINEST))
{
log.finest("Processing saveSerializedView - server-side state saving - save state");
}
//save state in server session
saveSerializedViewInServletSession(facesContext, serializedView);
if (log.isLoggable(Level.FINEST))
{
log.finest("Exiting saveSerializedView - server-side state saving - saved state");
}
return encodeSerializedState(facesContext, serializedView);
}
@Override
public Object restoreSerializedView(FacesContext facesContext, String viewId, Object viewState)
{
if (log.isLoggable(Level.FINEST))
{
log.finest("Restoring view from session");
}
Integer serverStateId = getServerStateId((Object[]) viewState);
return (serverStateId == null)
? null
: getSerializedViewFromServletSession(facesContext, viewId, serverStateId);
}
public Object encodeSerializedState(FacesContext facesContext, Object serializedView)
{
Object[] identifier = new Object[2];
identifier[JSF_SEQUENCE_INDEX] = Integer.toString(getNextViewSequence(facesContext), Character.MAX_RADIX);
return identifier;
}
@Override
public boolean isWriteStateAfterRenderViewRequired(FacesContext facesContext)
{
return false;
}
//------------------------------------- Custom methods -----------------------------------------------------
private boolean isUseFlashScopePurgeViewsInSession(ExternalContext externalContext)
{
if (_useFlashScopePurgeViewsInSession == null)
{
_useFlashScopePurgeViewsInSession = WebConfigParamUtils.getBooleanInitParameter(
externalContext, USE_FLASH_SCOPE_PURGE_VIEWS_IN_SESSION, false);
}
return _useFlashScopePurgeViewsInSession;
}
private Integer getNumberOfSequentialViewsInSession(ExternalContext externalContext)
{
if (!_numberOfSequentialViewsInSessionSet)
{
_numberOfSequentialViewsInSession = WebConfigParamUtils.getIntegerInitParameter(
externalContext,
NUMBER_OF_SEQUENTIAL_VIEWS_IN_SESSION_PARAM);
_numberOfSequentialViewsInSessionSet = true;
}
return _numberOfSequentialViewsInSession;
}
}