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.model.ComponentName;
026import org.nuxeo.runtime.model.DefaultComponent;
027
028public class TrashServiceImpl extends DefaultComponent {
029
030    /** @since 10.2 */
031    public static final ComponentName NAME = new ComponentName("org.nuxeo.ecm.core.trash.TrashService");
032
033    /** @since 10.1 */
034    public static final String MIGRATION_ID = "trash-storage"; // also in XML
035
036    /** @since 10.1 */
037    public static final String MIGRATION_STATE_LIFECYCLE = "lifecycle"; // also in XML
038
039    /** @since 10.1 */
040    public static final String MIGRATION_STATE_PROPERTY = "property"; // also in XML
041
042    /** @since 10.1 */
043    public static final String MIGRATION_STEP_LIFECYCLE_TO_PROPERTY = "lifecycle-to-property"; // also in XML
044
045    protected volatile TrashService trashService;
046
047    // called under synchronized (this)
048    @SuppressWarnings("deprecation")
049    protected TrashService recomputeTrashService() {
050        MigrationService migrationService = Framework.getService(MigrationService.class);
051        MigrationStatus status = migrationService.getStatus(MIGRATION_ID);
052        if (status == null) {
053            throw new IllegalStateException("Unknown migration status for: " + MIGRATION_ID);
054        }
055        if (status.isRunning()) {
056            String step = status.getStep();
057            if (MIGRATION_STEP_LIFECYCLE_TO_PROPERTY.equals(step)) {
058                return new BridgeTrashService(new LifeCycleTrashService(), new PropertyTrashService());
059            } else {
060                throw new IllegalStateException("Unknown migration step: " + step);
061            }
062        } else {
063            String state = status.getState();
064            if (MIGRATION_STATE_LIFECYCLE.equals(state)) {
065                return new LifeCycleTrashService();
066            } else if (MIGRATION_STATE_PROPERTY.equals(state)) {
067                return new PropertyTrashService();
068            } else {
069                throw new IllegalStateException("Unknown migration state: " + state);
070            }
071        }
072    }
073
074    @Override
075    @SuppressWarnings("unchecked")
076    public <T> T getAdapter(Class<T> adapter) {
077        if (adapter == TrashServiceImpl.class) {
078            return adapter.cast(this);
079        } else if (trashService == null) {
080            synchronized (this) {
081                if (trashService == null) {
082                    trashService = recomputeTrashService();
083                }
084            }
085        }
086        return (T) trashService;
087    }
088
089    /**
090     * Called when the migration status changes, to recompute the new service.
091     *
092     * @since 10.2
093     */
094    public void invalidateTrashServiceImplementation() {
095        synchronized (this) {
096            trashService = recomputeTrashService();
097        }
098    }
099
100}