| /* |
| * 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.commons.jci.listeners; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.commons.io.IOUtils; |
| import org.apache.commons.jci.ReloadingClassLoader; |
| import org.apache.commons.jci.monitor.FilesystemAlterationObserver; |
| import org.apache.commons.jci.stores.MemoryResourceStore; |
| import org.apache.commons.jci.stores.ResourceStore; |
| import org.apache.commons.jci.stores.Transactional; |
| import org.apache.commons.jci.utils.ConversionUtils; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** |
| * This Listener waits for FAM events to trigger a reload of classes |
| * or resources. |
| * |
| * @author tcurdt |
| */ |
| public class ReloadingListener extends AbstractFilesystemAlterationListener { |
| |
| private final Log log = LogFactory.getLog(ReloadingListener.class); |
| |
| private final Set<ReloadNotificationListener> notificationListeners = new HashSet<ReloadNotificationListener>(); |
| private final ResourceStore store; |
| |
| public ReloadingListener() { |
| this(new MemoryResourceStore()); |
| } |
| |
| public ReloadingListener( final ResourceStore pStore ) { |
| store = pStore; |
| } |
| |
| public ResourceStore getStore() { |
| return store; |
| } |
| |
| public void addReloadNotificationListener( final ReloadNotificationListener pNotificationListener ) { |
| notificationListeners.add(pNotificationListener); |
| |
| if (pNotificationListener instanceof ReloadingClassLoader) { |
| ((ReloadingClassLoader)pNotificationListener).addResourceStore(store); |
| } |
| |
| } |
| |
| public boolean isReloadRequired( final FilesystemAlterationObserver pObserver ) { |
| boolean reload = false; |
| |
| final Collection<File> created = getCreatedFiles(); |
| final Collection<File> changed = getChangedFiles(); |
| final Collection<File> deleted = getDeletedFiles(); |
| |
| log.debug("created:" + created.size() + " changed:" + changed.size() + " deleted:" + deleted.size() + " resources"); |
| |
| if (deleted.size() > 0) { |
| for (File file : deleted) { |
| final String resourceName = ConversionUtils.getResourceNameFromFileName(ConversionUtils.relative(pObserver.getRootDirectory(), file)); |
| store.remove(resourceName); |
| } |
| reload = true; |
| } |
| |
| if (created.size() > 0) { |
| for (File file : created) { |
| FileInputStream is = null; |
| try { |
| is = new FileInputStream(file); |
| final byte[] bytes = IOUtils.toByteArray(is); |
| final String resourceName = ConversionUtils.getResourceNameFromFileName(ConversionUtils.relative(pObserver.getRootDirectory(), file)); |
| store.write(resourceName, bytes); |
| } catch(final Exception e) { |
| log.error("could not load " + file, e); |
| } finally { |
| IOUtils.closeQuietly(is); |
| } |
| } |
| } |
| |
| if (changed.size() > 0) { |
| for (File file : changed) { |
| FileInputStream is = null; |
| try { |
| is = new FileInputStream(file); |
| final byte[] bytes = IOUtils.toByteArray(is); |
| final String resourceName = ConversionUtils.getResourceNameFromFileName(ConversionUtils.relative(pObserver.getRootDirectory(), file)); |
| store.write(resourceName, bytes); |
| } catch(final Exception e) { |
| log.error("could not load " + file, e); |
| } finally { |
| IOUtils.closeQuietly(is); |
| } |
| } |
| reload = true; |
| } |
| |
| return reload; |
| } |
| |
| @Override |
| public void onStop( final FilesystemAlterationObserver pObserver ) { |
| |
| |
| if (store instanceof Transactional) { |
| ((Transactional)store).onStart(); |
| } |
| |
| final boolean reload = isReloadRequired(pObserver); |
| |
| if (store instanceof Transactional) { |
| ((Transactional)store).onStop(); |
| } |
| |
| if (reload) { |
| notifyReloadNotificationListeners(); |
| } |
| |
| super.onStop(pObserver); |
| } |
| |
| void notifyReloadNotificationListeners() { |
| for (ReloadNotificationListener listener : notificationListeners) { |
| log.debug("notifying listener " + listener); |
| |
| listener.handleNotification(); |
| } |
| } |
| |
| @Override |
| public void onDirectoryCreate( final File pDir ) { |
| } |
| @Override |
| public void onDirectoryChange( final File pDir ) { |
| } |
| @Override |
| public void onDirectoryDelete( final File pDir ) { |
| } |
| } |