| /* |
| * 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.cocoon.caching.impl; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| |
| import org.apache.avalon.framework.context.Context; |
| import org.apache.avalon.framework.context.ContextException; |
| import org.apache.avalon.framework.context.Contextualizable; |
| import org.apache.cocoon.Constants; |
| import org.apache.cocoon.caching.EventRegistry; |
| |
| /** |
| * This implementation of <code>EventRegistry</code> handles |
| * persistence by serializing an <code>EventRegistryDataWrapper</code> to |
| * disk. |
| * |
| * @since 2.1 |
| * @author <a href="mailto:ghoward@apache.org">Geoff Howard</a> |
| * @version $Id$ |
| */ |
| public class DefaultEventRegistryImpl extends AbstractDoubleMapEventRegistry |
| implements EventRegistry, Contextualizable { |
| |
| private static final String PERSISTENT_FILE = "/WEB-INF/ev_cache.ser"; |
| |
| private File m_persistentFile; |
| |
| /** |
| * Set up the persistence file. |
| */ |
| public void contextualize(Context context) throws ContextException { |
| org.apache.cocoon.environment.Context ctx = |
| (org.apache.cocoon.environment.Context) context.get( |
| Constants.CONTEXT_ENVIRONMENT_CONTEXT); |
| // set up file |
| String path = ctx.getRealPath(PERSISTENT_FILE); |
| if (path == null) { |
| throw new ContextException("The cache event registry cannot be used inside an unexpanded WAR file. " + |
| "Real path for <" + PERSISTENT_FILE + "> is null."); |
| } |
| |
| m_persistentFile = new File(path); |
| } |
| |
| /** |
| * Persist by simple object serialization. If the serialization fails, an |
| * error is logged but not thrown because missing/invalid state is handled |
| * at startup. |
| */ |
| protected void persist(EventRegistryDataWrapper registryWrapper) { |
| ObjectOutputStream oos = null; |
| try { |
| oos = new ObjectOutputStream(new FileOutputStream(this.m_persistentFile)); |
| oos.writeObject(registryWrapper); |
| oos.flush(); |
| } catch (FileNotFoundException e) { |
| getLogger().error("Unable to persist EventRegistry", e); |
| } catch (IOException e) { |
| getLogger().error("Unable to persist EventRegistry", e); |
| } finally { |
| try { |
| if (oos != null) oos.close(); |
| } catch (IOException e) { /* ignored */ } |
| } |
| } |
| |
| /* |
| * I don't think this needs to get synchronized because it should |
| * only be called during initialize, which should only be called |
| * once by the container. |
| */ |
| protected boolean recover() { |
| if (this.m_persistentFile.exists()) { |
| ObjectInputStream ois = null; |
| EventRegistryDataWrapper ecdw = null; |
| try { |
| ois = new ObjectInputStream(new FileInputStream(this.m_persistentFile)); |
| ecdw = (EventRegistryDataWrapper) ois.readObject(); |
| } catch (FileNotFoundException e) { |
| getLogger().error("Unable to retrieve EventRegistry", e); |
| createBlankCache(); |
| return false; |
| } catch (IOException e) { |
| getLogger().error("Unable to retrieve EventRegistry", e); |
| createBlankCache(); |
| return false; |
| } catch (ClassNotFoundException e) { |
| getLogger().error("Unable to retrieve EventRegistry", e); |
| createBlankCache(); |
| return false; |
| } finally { |
| try { |
| if (ois != null) ois.close(); |
| } catch (IOException e) { |
| // ignore |
| } |
| } |
| unwrapRegistry(ecdw); |
| } else { |
| getLogger().warn(this.m_persistentFile + " does not exist - Unable to " + |
| "retrieve EventRegistry."); |
| createBlankCache(); |
| return false; |
| } |
| return true; |
| } |
| |
| } |