| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.sling.installer.provider.jcr.impl; |
| |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import javax.jcr.RepositoryException; |
| import javax.jcr.Session; |
| import javax.jcr.observation.Event; |
| import javax.jcr.observation.EventIterator; |
| import javax.jcr.observation.EventListener; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Listen for JCR events under one of our roots, to find out |
| * when new WatchedFolders must be created, or when some might |
| * have been deleted. |
| */ |
| class RootFolderListener implements EventListener { |
| |
| private final Logger logger = LoggerFactory.getLogger(this.getClass()); |
| private final RescanTimer timer; |
| private final String watchedPath; |
| |
| private final InstallerConfig cfg; |
| |
| private final String pathWithSlash; |
| |
| RootFolderListener(final Session session, final String path, final RescanTimer timer, final InstallerConfig cfg) |
| throws RepositoryException { |
| this.timer = timer; |
| this.watchedPath = path; |
| this.pathWithSlash = path; |
| this.cfg = cfg; |
| |
| final int eventTypes = Event.NODE_ADDED | Event.NODE_REMOVED |
| | Event.PROPERTY_ADDED | Event.PROPERTY_CHANGED | Event.PROPERTY_REMOVED; |
| final boolean isDeep = true; |
| final boolean noLocal = true; |
| session.getWorkspace().getObservationManager().addEventListener(this, eventTypes, watchedPath, |
| isDeep, null, null, noLocal); |
| |
| logger.info("Watching {} to detect potential changes in subfolders", watchedPath); |
| } |
| |
| @Override |
| public String toString() { |
| return getClass().getSimpleName() + " (" + watchedPath + ")"; |
| } |
| |
| void cleanup(final Session session) throws RepositoryException { |
| session.getWorkspace().getObservationManager().removeEventListener(this); |
| } |
| |
| /** |
| * Schedule a scan. |
| */ |
| public void onEvent(final EventIterator it) { |
| // we only do the global scan for node changes |
| boolean globalScan = false; |
| // copy watched folders and remove all for other roots |
| final List<WatchedFolder> checkFolders = cfg.cloneWatchedFolders(); |
| final Iterator<WatchedFolder> i = checkFolders.iterator(); |
| while ( i.hasNext() ) { |
| final WatchedFolder wf = i.next(); |
| if ( !wf.getPathWithSlash().startsWith(this.pathWithSlash)) { |
| i.remove(); |
| } |
| } |
| while(it.hasNext()) { |
| final Event e = it.nextEvent(); |
| logger.debug("Got event {}", e); |
| if ( e.getType() == Event.NODE_ADDED || e.getType() == Event.NODE_REMOVED ) { |
| globalScan = true; |
| } |
| try { |
| final String path = e.getPath(); |
| |
| final Iterator<WatchedFolder> ii = checkFolders.iterator(); |
| while ( ii.hasNext() ) { |
| final WatchedFolder folder = ii.next(); |
| if ( path.startsWith(folder.getPathWithSlash()) ) { |
| folder.markForScan(); |
| ii.remove(); |
| break; |
| } |
| } |
| } catch ( final RepositoryException re ) { |
| logger.warn("Error while getting path from event", re); |
| } |
| } |
| if ( globalScan ) { |
| timer.scheduleScan(); |
| } |
| } |
| } |