org.eclipse.jetty.deploy.ContextDeployer Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2013 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.deploy;
import java.io.File;
import java.io.FilenameFilter;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.jetty.deploy.providers.ContextProvider;
import org.eclipse.jetty.deploy.providers.ScanningAppProvider;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.handler.ContextHandlerCollection;
import org.eclipse.jetty.util.AttributesMap;
import org.eclipse.jetty.util.Scanner;
import org.eclipse.jetty.util.component.AbstractLifeCycle;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.resource.Resource;
import org.eclipse.jetty.xml.XmlConfiguration;
/**
* Legacy Context Deployer.
*
*
* Note: The WebAppDeployer is being phased out of Jetty in favor of the {@link DeploymentManager} and
* {@link org.eclipse.jetty.deploy.providers.ContextProvider} implementation.
*
*
* This deployer scans a designated directory by {@link #setConfigurationDir(String)} for the appearance/disappearance
* or changes to xml configuration files. The scan is performed at startup and at an optional hot deployment frequency
* specified by {@link #setScanInterval(int)}. By default, the scanning is NOT recursive, but can be made so by
* {@link #setRecursive(boolean)}.
*
*
* Each configuration file is in {@link XmlConfiguration} format and represents the configuration of a instance of
* {@link ContextHandler} (or a subclass specified by the XML Configure element).
*
*
* The xml should configure the context and the instance is deployed to the {@link ContextHandlerCollection} specified
* by {@link Server#setHandler(org.eclipse.jetty.server.Handler)}.
*
*
* Similarly, when one of these existing files is removed, the corresponding context is undeployed; when one of these
* files is changed, the corresponding context is undeployed, the (changed) xml config file reapplied to it, and then
* (re)deployed.
*
*
* Note that the context itself is NOT copied into the hot deploy directory. The webapp directory or war file can exist
* anywhere. It is the xml config file that points to it's location and deploys it from there.
*
*
* It means, for example, that you can keep a "read-only" copy of your webapp somewhere, and apply different
* configurations to it simply by dropping different xml configuration files into the configuration directory.
*
* @see DeploymentManager
* @see ScanningAppProvider
*
* @org.apache.xbean.XBean element="hotDeployer" description="Creates a hot deployer to watch a directory for changes at
* a configurable interval."
* @deprecated replaced with {@link ContextProvider} from the {@link DeploymentManager}
*/
@SuppressWarnings("unchecked")
@Deprecated
public class ContextDeployer extends AbstractLifeCycle
{
private static final Logger LOG = Log.getLogger(ContextDeployer.class);
private int _scanInterval=10;
private Scanner _scanner;
private ScannerListener _scannerListener;
private Resource _contextsDir;
private Map _currentDeployments = new HashMap();
private ContextHandlerCollection _contexts;
private ConfigurationManager _configMgr;
private boolean _recursive = false;
private AttributesMap _contextAttributes = new AttributesMap();
/* ------------------------------------------------------------ */
protected class ScannerListener implements Scanner.DiscreteListener
{
/**
* Handle a new deployment
*
* @see org.eclipse.jetty.util.Scanner.DiscreteListener#fileAdded(java.lang.String)
*/
public void fileAdded(String filename) throws Exception
{
deploy(filename);
}
/**
* Handle a change to an existing deployment. Undeploy then redeploy.
*
* @see org.eclipse.jetty.util.Scanner.DiscreteListener#fileChanged(java.lang.String)
*/
public void fileChanged(String filename) throws Exception
{
redeploy(filename);
}
/**
* Handle an undeploy.
*
* @see org.eclipse.jetty.util.Scanner.DiscreteListener#fileRemoved(java.lang.String)
*/
public void fileRemoved(String filename) throws Exception
{
undeploy(filename);
}
@Override
public String toString()
{
return "ContextDeployer$Scanner";
}
}
/**
* Constructor
*/
public ContextDeployer()
{
LOG.warn("ContextDeployer is deprecated. Use ContextProvider");
_scanner=new Scanner();
}
/* ------------------------------------------------------------ */
/**
* @return the ContextHandlerColletion to which to deploy the contexts
*/
public ContextHandlerCollection getContexts()
{
return _contexts;
}
/* ------------------------------------------------------------ */
/**
* Associate with a {@link ContextHandlerCollection}.
*
* @param contexts
* the ContextHandlerColletion to which to deploy the contexts
*/
public void setContexts(ContextHandlerCollection contexts)
{
if (isStarted()||isStarting())
throw new IllegalStateException("Cannot set Contexts after deployer start");
_contexts=contexts;
}
/* ------------------------------------------------------------ */
/**
* @param seconds
* The period in second between scans for changed configuration
* files. A zero or negative interval disables hot deployment
*/
public void setScanInterval(int seconds)
{
if (isStarted()||isStarting())
throw new IllegalStateException("Cannot change scan interval after deployer start");
_scanInterval=seconds;
}
/* ------------------------------------------------------------ */
public int getScanInterval()
{
return _scanInterval;
}
/* ------------------------------------------------------------ */
/**
* @param dir Directory to scan for context descriptors
*/
public void setContextsDir(String dir)
{
try
{
_contextsDir=Resource.newResource(dir);
}
catch(Exception e)
{
throw new IllegalArgumentException(e);
}
}
/* ------------------------------------------------------------ */
public String getContextsDir()
{
return _contextsDir==null?null:_contextsDir.toString();
}
/* ------------------------------------------------------------ */
/**
* @param dir
* @throws Exception
* @deprecated use {@link #setContextsDir(String)}
*/
@Deprecated
public void setConfigurationDir(String dir) throws Exception
{
setConfigurationDir(Resource.newResource(dir));
}
/* ------------------------------------------------------------ */
/**
* @param file
* @throws Exception
* @deprecated use {@link #setContextsDir(String)}
*/
@Deprecated
public void setConfigurationDir(File file) throws Exception
{
setConfigurationDir(Resource.newResource(Resource.toURL(file)));
}
/* ------------------------------------------------------------ */
/**
* @param resource
* @deprecated use {@link #setContextsDir(String)}
*/
@Deprecated
public void setConfigurationDir(Resource resource)
{
if (isStarted()||isStarting())
throw new IllegalStateException("Cannot change hot deploy dir after deployer start");
_contextsDir=resource;
}
/* ------------------------------------------------------------ */
/**
* @param directory
* @deprecated use {@link #setContextsDir(String)}
*/
@Deprecated
public void setDirectory(String directory) throws Exception
{
setConfigurationDir(directory);
}
/* ------------------------------------------------------------ */
/**
* @return the directory
* @deprecated use {@link #setContextsDir(String)}
*/
@Deprecated
public String getDirectory()
{
return getConfigurationDir().getName();
}
/* ------------------------------------------------------------ */
/**
* @return the configuration directory
* @deprecated use {@link #setContextsDir(String)}
*/
@Deprecated
public Resource getConfigurationDir()
{
return _contextsDir;
}
/* ------------------------------------------------------------ */
/**
* @param configMgr
*/
public void setConfigurationManager(ConfigurationManager configMgr)
{
_configMgr=configMgr;
}
/* ------------------------------------------------------------ */
/**
* @return the configuration manager
*/
public ConfigurationManager getConfigurationManager()
{
return _configMgr;
}
/* ------------------------------------------------------------ */
public void setRecursive (boolean recursive)
{
_recursive=recursive;
}
/* ------------------------------------------------------------ */
public boolean getRecursive ()
{
return _recursive;
}
/* ------------------------------------------------------------ */
public boolean isRecursive()
{
return _recursive;
}
/* ------------------------------------------------------------ */
/**
* Set a contextAttribute that will be set for every Context deployed by this deployer.
* @param name
* @param value
*/
public void setAttribute (String name, Object value)
{
_contextAttributes.setAttribute(name,value);
}
/* ------------------------------------------------------------ */
/**
* Get a contextAttribute that will be set for every Context deployed by this deployer.
* @param name
* @return the attribute value
*/
public Object getAttribute (String name)
{
return _contextAttributes.getAttribute(name);
}
/* ------------------------------------------------------------ */
/**
* Remove a contextAttribute that will be set for every Context deployed by this deployer.
* @param name
*/
public void removeAttribute(String name)
{
_contextAttributes.removeAttribute(name);
}
/* ------------------------------------------------------------ */
private void deploy(String filename) throws Exception
{
ContextHandler context=createContext(filename);
LOG.info("Deploy "+filename+" -> "+ context);
_contexts.addHandler(context);
_currentDeployments.put(filename,context);
if (_contexts.isStarted())
context.start();
}
/* ------------------------------------------------------------ */
private void undeploy(String filename) throws Exception
{
ContextHandler context=(ContextHandler)_currentDeployments.get(filename);
LOG.info("Undeploy "+filename+" -> "+context);
if (context==null)
return;
context.stop();
_contexts.removeHandler(context);
_currentDeployments.remove(filename);
}
/* ------------------------------------------------------------ */
private void redeploy(String filename) throws Exception
{
undeploy(filename);
deploy(filename);
}
/* ------------------------------------------------------------ */
/**
* Start the hot deployer looking for webapps to deploy/undeploy
*
* @see org.eclipse.jetty.util.component.AbstractLifeCycle#doStart()
*/
@SuppressWarnings("deprecation")
@Override
protected void doStart() throws Exception
{
if (_contextsDir==null)
throw new IllegalStateException("No configuration dir specified");
if (_contexts==null)
throw new IllegalStateException("No context handler collection specified for deployer");
_scanner.setScanDir(_contextsDir.getFile());
_scanner.setScanInterval(getScanInterval());
_scanner.setRecursive(_recursive); //only look in the top level for deployment files?
// Accept changes only in files that could be a deployment descriptor
_scanner.setFilenameFilter(new FilenameFilter()
{
public boolean accept(File dir, String name)
{
try
{
if (name.endsWith(".xml"))
return true;
return false;
}
catch (Exception e)
{
LOG.warn(e);
return false;
}
}
});
_scannerListener=new ScannerListener();
_scanner.addListener(_scannerListener);
_scanner.scan();
_scanner.start();
_contexts.getServer().getContainer().addBean(_scanner);
}
/* ------------------------------------------------------------ */
/**
* Stop the hot deployer.
*
* @see org.eclipse.jetty.util.component.AbstractLifeCycle#doStop()
*/
@Override
protected void doStop() throws Exception
{
_scanner.removeListener(_scannerListener);
_scanner.stop();
}
/* ------------------------------------------------------------ */
/**
* Create a WebAppContext for the webapp being hot deployed, then apply the
* xml config file to it to configure it.
*
* @param filename
* the config file found in the hot deploy directory
* @return
* @throws Exception
*/
private ContextHandler createContext(String filename) throws Exception
{
// The config file can call any method on WebAppContext to configure
// the webapp being deployed.
Resource resource = Resource.newResource(filename);
if (!resource.exists())
return null;
XmlConfiguration xmlConfiguration=new XmlConfiguration(resource.getURL());
xmlConfiguration.getIdMap().put("Server", _contexts.getServer());
if (_configMgr!=null)
xmlConfiguration.getProperties().putAll(_configMgr.getProperties());
ContextHandler context=(ContextHandler)xmlConfiguration.configure();
// merge attributes
if (_contextAttributes!=null && _contextAttributes.size()>0)
{
AttributesMap attributes = new AttributesMap(_contextAttributes);
attributes.addAll(context.getAttributes());
context.setAttributes(attributes);
}
return context;
}
}