//
// ========================================================================
// 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.deploy.providers;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import org.eclipse.jetty.deploy.App;
import org.eclipse.jetty.deploy.AppProvider;
import org.eclipse.jetty.deploy.DeploymentManager;
import org.eclipse.jetty.util.Scanner;
import org.eclipse.jetty.util.annotation.ManagedAttribute;
import org.eclipse.jetty.util.annotation.ManagedObject;
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;
/**
*/
@ManagedObject("Abstract Provider for loading webapps")
public abstract class ScanningAppProvider extends AbstractLifeCycle implements AppProvider
{
private static final Logger LOG = Log.getLogger(ScanningAppProvider.class);
private Map<String, App> _appMap = new HashMap<String, App>();
private DeploymentManager _deploymentManager;
protected FilenameFilter _filenameFilter;
private final List<Resource> _monitored= new CopyOnWriteArrayList<>();
private boolean _recursive = false;
private int _scanInterval = 10;
private Scanner _scanner;
/* ------------------------------------------------------------ */
private final Scanner.DiscreteListener _scannerListener = new Scanner.DiscreteListener()
{
@Override
public void fileAdded(String filename) throws Exception
{
ScanningAppProvider.this.fileAdded(filename);
}
@Override
public void fileChanged(String filename) throws Exception
{
ScanningAppProvider.this.fileChanged(filename);
}
@Override
public void fileRemoved(String filename) throws Exception
{
ScanningAppProvider.this.fileRemoved(filename);
}
};
/* ------------------------------------------------------------ */
protected ScanningAppProvider()
{
}
/* ------------------------------------------------------------ */
protected ScanningAppProvider(FilenameFilter filter)
{
_filenameFilter = filter;
}
/* ------------------------------------------------------------ */
protected void setFilenameFilter(FilenameFilter filter)
{
if (isRunning())
throw new IllegalStateException();
_filenameFilter = filter;
}
/* ------------------------------------------------------------ */
/**
* @return The index of currently deployed applications.
*/
protected Map<String, App> getDeployedApps()
{
return _appMap;
}
/* ------------------------------------------------------------ */
/**
* Called by the Scanner.DiscreteListener to create a new App object.
* Isolated in a method so that it is possible to override the default App
* object for specialized implementations of the AppProvider.
*
* @param filename
* The file that is the context.xml. It is resolved by
* {@link Resource#newResource(String)}
* @return The App object for this particular context definition file.
*/
protected App createApp(String filename)
{
return new App(_deploymentManager,this,filename);
}
/* ------------------------------------------------------------ */
@Override
protected void doStart() throws Exception
{
if (LOG.isDebugEnabled())
LOG.debug(this.getClass().getSimpleName() + ".doStart()");
if (_monitored.size()==0)
throw new IllegalStateException("No configuration dir specified");
LOG.info("Deployment monitor " + _monitored + " at interval " + _scanInterval);
List<File> files = new ArrayList<>();
for (Resource resource:_monitored)
{
if (resource.exists() && resource.getFile().canRead())
files.add(resource.getFile());
else
LOG.warn("Does not exist: "+resource);
}
_scanner = new Scanner();
_scanner.setScanDirs(files);
_scanner.setScanInterval(_scanInterval);
_scanner.setRecursive(_recursive);
_scanner.setFilenameFilter(_filenameFilter);
_scanner.setReportDirs(true);
_scanner.addListener(_scannerListener);
_scanner.start();
}
/* ------------------------------------------------------------ */
@Override
protected void doStop() throws Exception
{
if (_scanner!=null)
{
_scanner.stop();
_scanner.removeListener(_scannerListener);
_scanner = null;
}
}
/* ------------------------------------------------------------ */
protected boolean exists(String path)
{
return _scanner.exists(path);
}
/* ------------------------------------------------------------ */
protected void fileAdded(String filename) throws Exception
{
if (LOG.isDebugEnabled())
LOG.debug("added {}",filename);
App app = ScanningAppProvider.this.createApp(filename);
if (app != null)
{
_appMap.put(filename,app);
_deploymentManager.addApp(app);
}
}
/* ------------------------------------------------------------ */
protected void fileChanged(String filename) throws Exception
{
if (LOG.isDebugEnabled())
LOG.debug("changed {}",filename);
App app = _appMap.remove(filename);
if (app != null)
{
_deploymentManager.removeApp(app);
}
app = ScanningAppProvider.this.createApp(filename);
if (app != null)
{
_appMap.put(filename,app);
_deploymentManager.addApp(app);
}
}
/* ------------------------------------------------------------ */
protected void fileRemoved(String filename) throws Exception
{
if (LOG.isDebugEnabled())
LOG.debug("removed {}",filename);
App app = _appMap.remove(filename);
if (app != null)
_deploymentManager.removeApp(app);
}
/* ------------------------------------------------------------ */
/**
* Get the deploymentManager.
*
* @return the deploymentManager
*/
public DeploymentManager getDeploymentManager()
{
return _deploymentManager;
}
/* ------------------------------------------------------------ */
public Resource getMonitoredDirResource()
{
if (_monitored.size()==0)
return null;
if (_monitored.size()>1)
throw new IllegalStateException();
return _monitored.get(0);
}
/* ------------------------------------------------------------ */
public String getMonitoredDirName()
{
Resource resource=getMonitoredDirResource();
return resource==null?null:resource.toString();
}
/* ------------------------------------------------------------ */
@ManagedAttribute("scanning interval to detect changes which need reloaded")
public int getScanInterval()
{
return _scanInterval;
}
/* ------------------------------------------------------------ */
@ManagedAttribute("recursive scanning supported")
public boolean isRecursive()
{
return _recursive;
}
/* ------------------------------------------------------------ */
@Override
public void setDeploymentManager(DeploymentManager deploymentManager)
{
_deploymentManager = deploymentManager;
}
/* ------------------------------------------------------------ */
public void setMonitoredResources(List<Resource> resources)
{
_monitored.clear();
_monitored.addAll(resources);
}
/* ------------------------------------------------------------ */
public List<Resource> getMonitoredResources()
{
return Collections.unmodifiableList(_monitored);
}
/* ------------------------------------------------------------ */
public void setMonitoredDirResource(Resource resource)
{
setMonitoredResources(Collections.singletonList(resource));
}
/* ------------------------------------------------------------ */
public void addScannerListener(Scanner.Listener listener)
{
_scanner.addListener(listener);
}
/* ------------------------------------------------------------ */
/**
* @param dir
* Directory to scan for context descriptors or war files
*/
public void setMonitoredDirName(String dir)
{
setMonitoredDirectories(Collections.singletonList(dir));
}
/* ------------------------------------------------------------ */
public void setMonitoredDirectories(Collection<String> directories)
{
try
{
List<Resource> resources = new ArrayList<>();
for (String dir:directories)
resources.add(Resource.newResource(dir));
setMonitoredResources(resources);
}
catch (Exception e)
{
throw new IllegalArgumentException(e);
}
}
/* ------------------------------------------------------------ */
protected void setRecursive(boolean recursive)
{
_recursive = recursive;
}
/* ------------------------------------------------------------ */
public void setScanInterval(int scanInterval)
{
_scanInterval = scanInterval;
}
}