001/*
002 * (C) Copyright 2006-2007 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     <a href="mailto:[email protected]">Anahide Tchertchian</a>
018 *
019 * $Id: IOManagerComponent.java 24959 2007-09-14 13:46:47Z atchertchian $
020 */
021
022package org.nuxeo.ecm.platform.io.impl;
023
024import org.apache.commons.logging.Log;
025import org.apache.commons.logging.LogFactory;
026import org.nuxeo.ecm.platform.io.api.IOManager;
027import org.nuxeo.ecm.platform.io.api.IOResourceAdapter;
028import org.nuxeo.ecm.platform.io.descriptors.IOResourceAdapterDescriptor;
029import org.nuxeo.runtime.model.ComponentInstance;
030import org.nuxeo.runtime.model.ComponentName;
031import org.nuxeo.runtime.model.DefaultComponent;
032
033/**
034 * Component registering {@link IOResourceAdapter} instances to an {@link IOManager}.
035 *
036 * @author <a href="mailto:[email protected]">Anahide Tchertchian</a>
037 */
038public class IOManagerComponent extends DefaultComponent {
039
040    public static final ComponentName NAME = new ComponentName(IOManagerComponent.class.getName());
041
042    public static final String ADAPTERS_EP_NAME = "adapters";
043
044    private static final Log log = LogFactory.getLog(IOManagerComponent.class);
045
046    private final IOManager service;
047
048    public IOManagerComponent() {
049        service = new IOManagerImpl();
050    }
051
052    public IOManager getIOManager() {
053        return service;
054    }
055
056    @Override
057    public void registerContribution(Object contribution, String extensionPoint, ComponentInstance contributor) {
058        if (extensionPoint.equals(ADAPTERS_EP_NAME)) {
059            IOResourceAdapterDescriptor desc = (IOResourceAdapterDescriptor) contribution;
060            String name = desc.getName();
061            String className = desc.getClassName();
062            IOResourceAdapter adapter;
063            try {
064                // Thread context loader is not working in isolated EARs
065                adapter = (IOResourceAdapter) IOManagerComponent.class.getClassLoader().loadClass(className).newInstance();
066            } catch (ReflectiveOperationException e) {
067                log.error("Caught error when instantiating adapter", e);
068                return;
069            }
070            adapter.setProperties(desc.getProperties());
071            IOResourceAdapter existing = service.getAdapter(name);
072            if (existing != null) {
073                log.warn(String.format("Overriding IO Resource adapter definition %s", name));
074                service.removeAdapter(name);
075            }
076            service.addAdapter(name, adapter);
077            log.info(String.format("IO resource adapter %s registered", name));
078        } else {
079            log.error(String.format("Unknown extension point %s, can't register !", extensionPoint));
080        }
081    }
082
083    @Override
084    public void unregisterContribution(Object contribution, String extensionPoint, ComponentInstance contributor) {
085        if (extensionPoint.equals(ADAPTERS_EP_NAME)) {
086            IOResourceAdapterDescriptor desc = (IOResourceAdapterDescriptor) contribution;
087            service.removeAdapter(desc.getName());
088        } else {
089            log.error(String.format("Unknown extension point %s, can't unregister !", extensionPoint));
090        }
091    }
092
093    @Override
094    @SuppressWarnings("unchecked")
095    public <T> T getAdapter(Class<T> adapter) {
096        if (adapter.isAssignableFrom(IOManager.class)) {
097            return (T) service;
098        }
099        return null;
100    }
101
102}