/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Sam
*/
package com.caucho.server.rewrite;
import com.caucho.config.Config;
import com.caucho.config.ConfigException;
import com.caucho.config.types.Period;
import com.caucho.loader.Environment;
import com.caucho.management.server.RewriteImportMXBean;
import com.caucho.util.Alarm;
import com.caucho.util.AlarmListener;
import com.caucho.util.L10N;
import com.caucho.vfs.Depend;
import com.caucho.vfs.Path;
import com.caucho.jmx.Description;
import javax.annotation.PostConstruct;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import java.util.logging.Level;
import java.util.logging.Logger;
public class ImportRule
extends AbstractRule
implements AlarmListener
{
private static L10N L = new L10N(ImportRule.class);
private static Logger log = Logger.getLogger(ImportRule.class.getName());
private Path _path;
private boolean _isOptional;
private long _dependencyCheckInterval = 2 * 1000L;
private long _errorCheckInterval = 2 * 1000L;
private Depend _depend;
private volatile MatchRule _matchRule;
private volatile boolean _isError;
private volatile String _redeployError;
private volatile boolean _isDestroyed = false;
private Alarm _alarm;
protected ImportRule(RewriteDispatch rewriteDispatch)
{
super(rewriteDispatch);
_dependencyCheckInterval = Environment.getDependencyCheckInterval();
}
public String getTagName()
{
return "import";
}
public void setDependencyCheckInterval(Period dependencyCheckInterval)
{
_dependencyCheckInterval = dependencyCheckInterval.getPeriod();
}
public long getDependencyCheckInterval()
{
return _dependencyCheckInterval;
}
public String getRedeployError()
{
return _redeployError;
}
public void setOptional(boolean isOptional)
{
_isOptional = isOptional;
}
public void setPath(Path path)
{
_path = path;
}
@Override
@PostConstruct
public void init()
{
if (_path == null)
throw new ConfigException(L.l("'path' attribute missing from resin:import."));
if (getName() == null)
setName(_path.getNativePath());
try {
load();
}
catch (ConfigException e) {
throw e;
}
catch (Exception e) {
throw ConfigException.create(e);
}
super.init();
_alarm = new Alarm("rewrite-dispatch-import", this, _dependencyCheckInterval);
}
@Override
protected RewriteRuleAdmin createAdmin()
{
return new RewriteImportAdmin(this);
}
public void setPassFilterChainMapper(FilterChainMapper passFilterChainMapper)
{
super.setPassFilterChainMapper(passFilterChainMapper);
if (_matchRule != null)
_matchRule.setPassFilterChainMapper(passFilterChainMapper);
}
public void setFailFilterChainMapper(FilterChainMapper failFilterChainMapper)
{
super.setFailFilterChainMapper(failFilterChainMapper);
if (_matchRule != null)
_matchRule.setFailFilterChainMapper(failFilterChainMapper);
}
public FilterChain map(String uri, String query, FilterChain accept)
throws ServletException
{
if (isEnabled() && _matchRule != null)
return _matchRule.map(uri, query, accept);
else if (getPassFilterChainMapper() != null)
return getPassFilterChainMapper().map(uri, query, accept);
else
return accept;
}
private synchronized void load()
throws Exception
{
if (_isDestroyed)
return;
if (_depend != null && !_depend.isModified())
return;
try {
_depend = new Depend(_path);
_isError = true;
MatchRule matchRule = new MatchRule(getRewriteDispatch());
matchRule.setPassFilterChainMapper(getPassFilterChainMapper());
matchRule.setFailFilterChainMapper(getFailFilterChainMapper());
if (_path.canRead() && ! _path.isDirectory()) {
}
else if (_isOptional) {
log.finer(L.l("import '{0}' is not readable.", _path));
matchRule.init();
_isError = false;
setMatchRule(matchRule);
return;
}
else {
throw new ConfigException(L.l("Required file '{0}' can not be read for import.",
_path.getNativePath()));
}
Config config = new Config();
config.configure(matchRule, _path);
_isError = false;
setMatchRule(matchRule);
}
finally {
clearCache();
}
}
private void setMatchRule(MatchRule matchRule)
{
MatchRule oldMatchRule = _matchRule;
if (oldMatchRule != null)
oldMatchRule.unregister();
matchRule.register();
_matchRule = matchRule;
if (oldMatchRule != null)
oldMatchRule.destroy();
}
public void handleAlarm(Alarm alarm)
{
alarm = _alarm;
if (_isDestroyed)
return;
try {
_redeployError = null;
load();
}
catch (Exception ex) {
_redeployError = ex.toString();
log.log(Level.WARNING, ex.toString(), ex);
}
finally {
if (! _isDestroyed) {
long delta = _isError ? _errorCheckInterval : _dependencyCheckInterval;
alarm.queue(delta);
}
}
}
private void update()
{
handleAlarm(null);
}
@Override
public void destroy()
{
try {
_isDestroyed = true;
Alarm alarm = _alarm;
_alarm = null;
MatchRule matchRule = _matchRule;
_matchRule = null;
if (alarm != null)
alarm.dequeue();
if (matchRule != null)
matchRule.destroy();
}
finally {
super.destroy();
}
}
public static class RewriteImportAdmin
extends RewriteRuleAdmin
implements RewriteImportMXBean
{
private final ImportRule _rule;
public RewriteImportAdmin(ImportRule rule)
{
super(rule);
_rule = rule;
}
@Override
public String getType()
{
return "RewriteImport";
}
public long getDependencyCheckInterval()
{
return _rule.getDependencyCheckInterval();
}
public String getRedeployError()
{
return _rule.getRedeployError();
}
@Description("Updates the imported rules if the file has changed")
public void update()
{
_rule.update();
}
}
}