ilog.views.gantt.servlet

Class IlvGanttSessionAttribute

java.lang.Object

ilog.views.gantt.servlet.IlvComponentSessionAttribute

ilog.views.gantt.servlet.IlvGanttSessionAttribute

All Implemented Interfaces:

EventListener, javax.servlet.http.HttpSessionBindingListener

public class IlvGanttSessionAttribute
extends IlvComponentSessionAttribute

The IlvGanttSessionAttribute class acts as a proxy for an IlvHierarchyChart bound to an HttpSession. When you bind a Gantt or Schedule chart as an attribute of an HttpSession, proper cleanup of the chart must occur when the session is invalidated or expires. This allows the chart to be garbage-collected or restored to a pool of available charts, depending on your choice of strategies. Instead of binding the chart directly to the session, use an instance of this class as a proxy:

 IlvHierarchyChart chart = null;
 HttpSession session = request.getSession();
 if (session.isNew()) {
   chart = ... create new chart or fetch from pool ...
   IlvGanttSessionAttribute proxy =
     new IlvGanttSessionAttribute(chart);
   session.setAttribute(CHART_KEY, proxy);
 } else {
   IlvGanttSessionAttribute proxy =
     (IlvGanttSessionAttribute)session.getAttribute(CHART_KEY);
   if (proxy != null)
     chart = proxy.getChart();
 }
 if (chart == null)
   throw new ServletException("session problem");
 

When all the sessions that the proxy and its component are associated with expire, the componentUnbound() method of the proxy will be invoked. You can override this method to customize your strategy for handling charts that are no longer associated with any sessions.

Since:

JViews 5.5

Constructor Summary

Constructors

Constructor and Description
IlvGanttSessionAttribute(IlvHierarchyChart chart) Creates an IlvGanttSessionAttribute proxy for the specified chart.

Method Summary

Modifier and Type	Method and Description
protected void	componentUnbound() This method is automatically invoked when the proxy is unbound from its last HTTP session.
IlvHierarchyChart	getChart() Returns the proxy's chart.

Methods inherited from class ilog.views.gantt.servlet.IlvComponentSessionAttribute

getComponent, valueBound, valueUnbound

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IlvGanttSessionAttribute

public IlvGanttSessionAttribute(IlvHierarchyChart chart)

Creates an IlvGanttSessionAttribute proxy for the specified chart.

Parameters:

chart - The chart.

Method Detail

getChart

public IlvHierarchyChart getChart()

Returns the proxy's chart.

Returns:

The chart.

componentUnbound

protected void componentUnbound()

This method is automatically invoked when the proxy is unbound from its last HTTP session. This method is invoked on the Swing event queue, making it safe to change the attributes of the proxy's chart. This implementation removes the component from any top-level Window it may have been added to, such as through IlvJHiddenPrintWindowFactory.createHiddenPrintWindow(), disposes the window, and unbinds the chart from its data model.

Overrides:

componentUnbound in class IlvComponentSessionAttribute