Java tutorial
/* * Copyright (c) 2000-2004 Netspective Communications LLC. All rights reserved. * * Netspective Communications LLC ("Netspective") permits redistribution, modification and use of this file in source * and binary form ("The Software") under the Netspective Source License ("NSL" or "The License"). The following * conditions are provided as a summary of the NSL but the NSL remains the canonical license and must be accepted * before using The Software. Any use of The Software indicates agreement with the NSL. * * 1. Each copy or derived work of The Software must preserve the copyright notice and this notice unmodified. * * 2. Redistribution of The Software is allowed in object code form only (as Java .class files or a .jar file * containing the .class files) and only as part of an application that uses The Software as part of its primary * functionality. No distribution of the package is allowed as part of a software development kit, other library, * or development tool without written consent of Netspective. Any modified form of The Software is bound by these * same restrictions. * * 3. Redistributions of The Software in any form must include an unmodified copy of The License, normally in a plain * ASCII text file unless otherwise agreed to, in writing, by Netspective. * * 4. The names "Netspective", "Axiom", "Commons", "Junxion", and "Sparx" are trademarks of Netspective and may not be * used to endorse or appear in products derived from The Software without written consent of Netspective. * * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED REPRESENTATIONS AND * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, * ARE HEREBY DISCLAIMED. * * NETSPECTIVE AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE OR ANY THIRD PARTY AS A * RESULT OF USING OR DISTRIBUTING THE SOFTWARE. IN NO EVENT WILL NETSPECTIVE OR ITS LICENSORS BE LIABLE FOR ANY LOST * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THE SOFTWARE, EVEN * IF IT HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. */ package com.netspective.sparx.report.tabular; import java.util.Collections; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.Map; import java.util.Set; import org.apache.commons.logging.Log; import com.netspective.commons.report.tabular.TabularReportDataSourceScrollState; import com.netspective.sparx.form.DialogContext; import com.netspective.sparx.value.HttpServletValueContext; /** * An implementation of HtmlTabularReportDataSourceScrollStates that stores the scroll states in a Map and provides * for a periodic check and retirement of inactive scroll states. */ public class HtmlTabularReportDataSourceScrollStatesManager implements HtmlTabularReportDataSourceScrollStates { private static final String ATTRNAME_ACTIVE_SCROLL_STATE = "active-scroll-state"; private static final long DEFAULT_TIMEOUT_CHECK_DELAY = 3 * 60 * 1000; // 3 minutes private static final Set allScrollStateManagers = new HashSet(); public static Set getAllScrollStateManagers() { return allScrollStateManagers; } public static void closeAllScrollStates(Log log) { for (Iterator i = allScrollStateManagers.iterator(); i.hasNext();) { HtmlTabularReportDataSourceScrollStatesManager states = (HtmlTabularReportDataSourceScrollStatesManager) i .next(); int count = states.closeAll(); log.debug("Closed " + count + " scroll states from " + states); } } private Map scrollStates = Collections.synchronizedMap(new HashMap()); private long timeoutDuration = DEFAULT_TIMEOUT_CHECK_DELAY; public HtmlTabularReportDataSourceScrollStatesManager() { allScrollStateManagers.add(this); } public long getTimeoutDuration() { return timeoutDuration; } public void setTimeoutDuration(long timeoutDuration) { this.timeoutDuration = timeoutDuration; } public Map getScrollStates() { return scrollStates; } public HtmlTabularReportDataSourceScrollState getScrollStateByDialogTransactionId(DialogContext dc) { return getScrollStateByDialogTransactionId(dc, dc.getDialogState().getIdentifier()); } public HtmlTabularReportDataSourceScrollState getScrollStateByDialogTransactionId(HttpServletValueContext vc, String id) { HtmlTabularReportDataSourceScrollState state = (HtmlTabularReportDataSourceScrollState) scrollStates .get(vc.getHttpRequest().getSession().getId() + "." + id); // since set the data source to auto close after a period of time, make sure the data source didn't close itself if (state != null && !state.isClosed()) return state; else return null; } public HtmlTabularReportDataSourceScrollState getActiveScrollState(HttpServletValueContext vc) { HtmlTabularReportDataSourceScrollState state = (HtmlTabularReportDataSourceScrollState) scrollStates .get(vc.getHttpRequest().getSession().getId() + "." + ATTRNAME_ACTIVE_SCROLL_STATE); // since set the data source to auto close after a period of time, make sure the data source didn't close itself if (state != null && !state.isClosed()) return state; else return null; } public void setActiveScrollState(DialogContext dc, TabularReportDataSourceScrollState state) { state.getDataSource().setAutoClose(timeoutDuration); final String sessionId = dc.getHttpRequest().getSession().getId(); scrollStates.put(sessionId + "." + state.getIdentifier(), state); scrollStates.put(sessionId + "." + ATTRNAME_ACTIVE_SCROLL_STATE, state); } public void removeActiveState(HttpServletValueContext vc, TabularReportDataSourceScrollState state) { final String sessionId = vc.getHttpRequest().getSession().getId(); scrollStates.remove(sessionId + "." + state.getIdentifier()); scrollStates.remove(sessionId + "." + ATTRNAME_ACTIVE_SCROLL_STATE); state.close(); } public void removeActiveState(HttpServletValueContext vc) { TabularReportDataSourceScrollState state = getActiveScrollState(vc); if (state != null) removeActiveState(vc, state); } public int closeAll() { Set statesRetired = new HashSet(); for (Iterator i = scrollStates.entrySet().iterator(); i.hasNext();) { Map.Entry entry = (Map.Entry) i.next(); HtmlTabularReportDataSourceScrollState state = (HtmlTabularReportDataSourceScrollState) entry .getValue(); if (!statesRetired.contains(state)) { statesRetired.add(state); state.close(); } } scrollStates.clear(); return statesRetired.size(); } }