/*
* 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.extensions.cdi.jsf.impl.scope.conversation;
import org.apache.myfaces.extensions.cdi.jsf.impl.scope.conversation.spi.WindowContextQuotaHandler;
import org.apache.myfaces.extensions.cdi.jsf.impl.scope.conversation.spi.EditableWindowContext;
import org.apache.myfaces.extensions.cdi.jsf.impl.scope.conversation.spi.EditableWindowContextManager;
import static org.apache.myfaces.extensions.cdi.jsf.impl.util.ExceptionUtils.tooManyOpenWindowException;
import org.apache.myfaces.extensions.cdi.jsf.impl.util.ConversationUtils;
import org.apache.myfaces.extensions.cdi.core.impl.scope.conversation.spi.WindowContextManager;
import org.apache.myfaces.extensions.cdi.core.api.scope.conversation.config.WindowContextConfig;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import java.util.Collection;
import java.util.Date;
/**
* @author Gerhard Petracek
*/
@ApplicationScoped
public class DefaultWindowContextQuotaHandler implements WindowContextQuotaHandler
{
private static final long serialVersionUID = 4354405166761604711L;
private int maxWindowContextCount;
/**
* Default constructor required by proxy libs
*/
public DefaultWindowContextQuotaHandler()
{
}
/**
* Constructor used by the container for creating the {@link WindowContextQuotaHandler} based on the given
* {@link WindowContextConfig}
* @param windowContextConfig current window-context-config
*/
@Inject
public DefaultWindowContextQuotaHandler(WindowContextConfig windowContextConfig)
{
this.maxWindowContextCount = windowContextConfig.getMaxWindowContextCount();
}
/**
* {@inheritDoc}
*/
public boolean isWindowContextQuotaViolated(int activeWindowContextCount)
{
return this.maxWindowContextCount < activeWindowContextCount;
}
/**
* {@inheritDoc}
*/
public void handleQuotaViolation()
{
if(!cleanupWindowContext())
{
throw tooManyOpenWindowException();
}
}
private boolean cleanupWindowContext()
{
WindowContextManager windowContextManager = ConversationUtils.getWindowContextManager();
if(windowContextManager instanceof EditableWindowContextManager)
{
EditableWindowContextManager editableWindowContextManager =
(EditableWindowContextManager)windowContextManager;
Collection<EditableWindowContext> activeWindowContexts = editableWindowContextManager.getWindowContexts();
int activeWindowContextCountBeforeCleanup = activeWindowContexts.size();
removeEldestWindowContext(editableWindowContextManager, activeWindowContexts);
if(activeWindowContextCountBeforeCleanup > editableWindowContextManager.getWindowContexts().size())
{
return true;
}
}
return false;
}
private void removeEldestWindowContext(EditableWindowContextManager editableWindowContextManager,
Collection<EditableWindowContext> activeWindowContexts)
{
EditableWindowContext windowContextToRemove = findEldestWindowContext(activeWindowContexts);
if(windowContextToRemove != null)
{
editableWindowContextManager.closeWindowContext(windowContextToRemove);
}
}
private EditableWindowContext findEldestWindowContext(Collection<EditableWindowContext> activeWindowContexts)
{
Date lastAccess = new Date();
EditableWindowContext result = null;
for(EditableWindowContext windowContext : activeWindowContexts)
{
if(lastAccess.after(windowContext.getLastAccess()))
{
lastAccess = windowContext.getLastAccess();
result = windowContext;
}
}
return result;
}
}