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//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.osgi.boot.internal.webapp;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import org.eclipse.jetty.osgi.boot.JettyBootstrapActivator;
import org.eclipse.jetty.osgi.boot.OSGiServerConstants;
import org.eclipse.jetty.osgi.boot.OSGiWebappConstants;
import org.eclipse.jetty.osgi.boot.ServiceProvider;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.ServiceEvent;
import org.osgi.framework.ServiceListener;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;
/**
* ServiceWatcher
*
* When a {@link ContextHandler} is activated as an osgi service we find a jetty deployer
* for it. The ContextHandler could be either a WebAppContext or any other derivative of
* ContextHandler.
*
* ContextHandlers and WebApps can also be deployed into jetty without creating them as
* osgi services. Instead, they can be deployed via manifest headers inside bundles. See
* {@link WebBundleTrackerCustomizer}.
*/
public class ServiceWatcher implements ServiceListener
{
private static Logger LOG = Log.getLogger(ServiceWatcher.class);
public static final String FILTER = "(objectclass=" + ServiceProvider.class.getName() + ")";
//track all instances of deployers of webapps as bundles
ServiceTracker _serviceTracker;
/* ------------------------------------------------------------ */
/**
* @param registry
*/
public ServiceWatcher() throws Exception
{
//track all instances of deployers of webapps
Bundle myBundle = FrameworkUtil.getBundle(this.getClass());
_serviceTracker = new ServiceTracker(myBundle.getBundleContext(), FrameworkUtil.createFilter(FILTER),null);
_serviceTracker.open();
}
/* ------------------------------------------------------------ */
/**
* @param managedServerName
* @return
*/
public Map<ServiceReference, ServiceProvider> getDeployers(String managedServerName)
{
if (managedServerName == null)
managedServerName = OSGiServerConstants.MANAGED_JETTY_SERVER_DEFAULT_NAME;
Map<ServiceReference, ServiceProvider> candidates = new HashMap<ServiceReference, ServiceProvider>();
ServiceReference[] references = _serviceTracker.getServiceReferences();
if (references != null)
{
for (ServiceReference ref:references)
{
String name = (String)ref.getProperty(OSGiServerConstants.MANAGED_JETTY_SERVER_NAME);
if (managedServerName.equalsIgnoreCase(name))
{
ServiceProvider candidate = (ServiceProvider)_serviceTracker.getService(ref);
if (candidate != null)
candidates.put(ref, candidate);
}
}
}
return candidates;
}
/* ------------------------------------------------------------ */
/**
* Receives notification that a service has had a lifecycle change.
*
* @param ev The <code>ServiceEvent</code> object.
*/
/**
* @see org.osgi.framework.ServiceListener#serviceChanged(org.osgi.framework.ServiceEvent)
*/
public void serviceChanged(ServiceEvent ev)
{
ServiceReference sr = ev.getServiceReference();
switch (ev.getType())
{
case ServiceEvent.MODIFIED:
case ServiceEvent.UNREGISTERING:
{
BundleContext context = FrameworkUtil.getBundle(JettyBootstrapActivator.class).getBundleContext();
ContextHandler contextHandler = (ContextHandler) context.getService(sr);
//if this was not a service that another of our deployers may have deployed (in which case they will undeploy it)
String watermark = (String)sr.getProperty(OSGiWebappConstants.WATERMARK);
//Get a jetty deployer targetted to the named server instance, or the default one if not named
//The individual deployer will decide if it can remove the context or not
String serverName = (String)sr.getProperty(OSGiServerConstants.MANAGED_JETTY_SERVER_NAME);
Map<ServiceReference, ServiceProvider> candidates = getDeployers(serverName);
if (candidates != null)
{
boolean removed = false;
Iterator<Entry<ServiceReference, ServiceProvider>> itor = candidates.entrySet().iterator();
while (!removed && itor.hasNext())
{
Entry<ServiceReference, ServiceProvider> e = itor.next();
try
{
removed = e.getValue().serviceRemoved(sr, contextHandler);
}
catch (Exception x)
{
LOG.warn("Error undeploying service representing jetty context ", x);
}
}
}
}
if (ev.getType() == ServiceEvent.UNREGISTERING)
{
break;
}
else
{
// modified, meaning: we reload it. now that we stopped it;
// we can register it.
}
case ServiceEvent.REGISTERED:
{
Bundle contributor = sr.getBundle();
BundleContext context = FrameworkUtil.getBundle(JettyBootstrapActivator.class).getBundleContext();
ContextHandler contextHandler = (ContextHandler) context.getService(sr);
if (contextHandler.getServer() != null)
{
// is configured elsewhere.
return;
}
String watermark = (String)sr.getProperty(OSGiWebappConstants.WATERMARK);
if (watermark != null && !"".equals(watermark))
return; //one of our deployers just registered the context as an OSGi service, so we can ignore it
//Get a jetty deployer targetted to the named server instance, or the default one if not named
String serverName = (String)sr.getProperty(OSGiServerConstants.MANAGED_JETTY_SERVER_NAME);
Map<ServiceReference, ServiceProvider> candidates = getDeployers(serverName);
if (candidates != null)
{
boolean added = false;
Iterator<Entry<ServiceReference, ServiceProvider>> itor = candidates.entrySet().iterator();
while (!added && itor.hasNext())
{
Entry<ServiceReference, ServiceProvider> e = itor.next();
try
{
added = e.getValue().serviceAdded(sr, contextHandler);
if (added && LOG.isDebugEnabled())
LOG.debug("Provider "+e.getValue()+" deployed "+contextHandler);
}
catch (Exception x)
{
LOG.warn("Error deploying service representing jetty context", x);
}
}
}
break;
}
}
}
}
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