001/*
002 * (C) Copyright 2006-2018 Nuxeo (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 *     Thierry Delprat
018 *     Florent Guillaume
019 */
020package org.nuxeo.ecm.core.trash;
021
022import org.nuxeo.runtime.api.Framework;
023import org.nuxeo.runtime.migration.MigrationService;
024import org.nuxeo.runtime.migration.MigrationService.MigrationStatus;
025import org.nuxeo.runtime.migration.MigrationService.StatusChangeNotifier;
026import org.nuxeo.runtime.model.ComponentName;
027import org.nuxeo.runtime.model.DefaultComponent;
028
029public class TrashServiceImpl extends DefaultComponent {
030
031    /** @since 10.2 */
032    public static final ComponentName NAME = new ComponentName("org.nuxeo.ecm.core.trash.TrashService");
033
034    /** @since 10.1 */
035    public static final String MIGRATION_ID = "trash-storage"; // also in XML
036
037    /** @since 10.1 */
038    public static final String MIGRATION_STATE_LIFECYCLE = "lifecycle"; // also in XML
039
040    /** @since 10.1 */
041    public static final String MIGRATION_STATE_PROPERTY = "property"; // also in XML
042
043    /** @since 10.1 */
044    public static final String MIGRATION_STEP_LIFECYCLE_TO_PROPERTY = "lifecycle-to-property"; // also in XML
045
046    protected volatile TrashService trashService;
047
048    // called under synchronized (this)
049    @SuppressWarnings("deprecation")
050    protected TrashService recomputeTrashService() {
051        MigrationService migrationService = Framework.getService(MigrationService.class);
052        MigrationStatus status = migrationService.getStatus(MIGRATION_ID);
053        if (status == null) {
054            throw new IllegalStateException("Unknown migration status for: " + MIGRATION_ID);
055        }
056        if (status.isRunning()) {
057            String step = status.getStep();
058            if (MIGRATION_STEP_LIFECYCLE_TO_PROPERTY.equals(step)) {
059                return new BridgeTrashService(new LifeCycleTrashService(), new PropertyTrashService());
060            } else {
061                throw new IllegalStateException("Unknown migration step: " + step);
062            }
063        } else {
064            String state = status.getState();
065            if (MIGRATION_STATE_LIFECYCLE.equals(state)) {
066                return new LifeCycleTrashService();
067            } else if (MIGRATION_STATE_PROPERTY.equals(state)) {
068                return new PropertyTrashService();
069            } else {
070                throw new IllegalStateException("Unknown migration state: " + state);
071            }
072        }
073    }
074
075    @Override
076    @SuppressWarnings("unchecked")
077    public <T> T getAdapter(Class<T> adapter) {
078        if (trashService == null) {
079            synchronized (this) {
080                if (trashService == null) {
081                    trashService = recomputeTrashService();
082                }
083            }
084        }
085        return (T) trashService;
086    }
087
088    /**
089     * Callback class to notify of migration status changes.
090     *
091     * @since 10.2
092     */
093    public static class TrashServiceStatusChangeNotifier implements StatusChangeNotifier {
094
095        @Override
096        public void notifyStatusChange() {
097            TrashServiceImpl trashService = (TrashServiceImpl) Framework.getRuntime()
098                                                                        .getComponent(TrashServiceImpl.NAME);
099            trashService.invalidateTrashServiceImplementation();
100        }
101    }
102
103    /**
104     * Called when the migration status changes, to recompute the new service.
105     *
106     * @since 10.2
107     */
108    public void invalidateTrashServiceImplementation() {
109        synchronized (this) {
110            trashService = recomputeTrashService();
111        }
112    }
113
114}