110 lines
4.2 KiB
Java
Executable File
110 lines
4.2 KiB
Java
Executable File
/*
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* Copyright (C) 2001-2004 Red Hat Inc. All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package com.arsdigita.themedirector;
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import com.arsdigita.domain.DomainObjectObserver;
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import com.arsdigita.domain.DomainObject;
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import com.arsdigita.persistence.DataObject;
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import com.arsdigita.persistence.PersistenceException;
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import com.arsdigita.persistence.SessionManager;
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import com.arsdigita.persistence.TransactionContext;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.GregorianCalendar;
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import java.util.HashSet;
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import java.util.Set;
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import org.apache.log4j.Logger;
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// This class listens for global save events for the theme. Currently,
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// it only cares about when the theme is actually published. If the
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// theme is published, then it creates a transaction listener that will
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// update other servers.
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public class ThemeObserver implements DomainObjectObserver {
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/** A logger instance. */
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private static final Logger s_log =
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Logger.getLogger(ThemeObserver.class);
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public static final String THEME_TXN_ATTR =
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ThemeObserver.class.getName() + ".listener";
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// The following events aren't needed
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public void set(DomainObject dobj,
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String name,
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Object old_value,
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Object new_value) {}
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public void add(DomainObject dobj,
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String name,
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DataObject dataObject) {}
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public void remove(DomainObject dobj,
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String name,
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DataObject dataObject) {}
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public void clear(DomainObject dobj,
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String name) {}
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public void beforeSave(DomainObject dobj) throws PersistenceException {}
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public void beforeDelete(DomainObject dobj) throws PersistenceException {}
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/**
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* One of the two events that trigger updates.
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* @param dobj
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* @throws PersistenceException
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*/
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public void afterSave(DomainObject dobj) throws PersistenceException {
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// if it was published in the last 3 minutes...3 minutes should
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// be long enough so that all other processes are run but
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// short enough that this won't occur for multiple transactions
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// the 3 minute time frame may need to be tuned, though.
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TransactionContext ctx = SessionManager.getSession().getTransactionContext();
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Set txnSet = (Set)ctx.getAttribute(THEME_TXN_ATTR);
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Theme theme = (Theme)dobj;
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if (txnSet == null || !txnSet.contains(theme)) {
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//listener isn't added, so add it if conditions are correct
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Date lastPublished = theme.getLastPublishedDate();
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if (lastPublished != null) {
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Calendar calendar = GregorianCalendar.getInstance();
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calendar.add(Calendar.MINUTE, -3);
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if (lastPublished.after(calendar.getTime())) {
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if (txnSet == null) {
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ctx.addTransactionListener(new ThemeTransactionListener());
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txnSet = new HashSet();
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ctx.setAttribute(THEME_TXN_ATTR, txnSet);
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}
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txnSet.add(theme);
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}
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}
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}
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}
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/**
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* Deletion not supported, empty implementation.
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* Triggers an update as well, but there is currently is no way
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* to delete a Theme.
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* @param dobj
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* @throws PersistenceException
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*/
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public void afterDelete(DomainObject dobj) throws PersistenceException {}
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}
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