001/*
002 * (C) Copyright 2013 Nuxeo SA (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl-2.1.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Vladimir Pasquier <vpasquier@nuxeo.com>
016 */
017package org.nuxeo.ecm.automation.core.impl;
018
019import org.nuxeo.ecm.automation.AutomationFilter;
020import org.nuxeo.ecm.automation.OperationException;
021import org.nuxeo.runtime.model.ContributionFragmentRegistry;
022
023import java.util.HashMap;
024import java.util.Map;
025
026/**
027 * @since 5.7.3
028 */
029public class AutomationFilterRegistry extends ContributionFragmentRegistry<AutomationFilter> {
030
031    /**
032     * Modifiable exception chain registry. Modifying the registry is using a lock and it's thread safe. Modifications
033     * are removing the cache.
034     */
035    protected final Map<String, AutomationFilter> automationFilters = new HashMap<>();
036
037    /**
038     * Read only cache for exception chain lookup. Thread safe. Not using synchronization if cache already created.
039     */
040    protected volatile Map<String, AutomationFilter> lookup;
041
042    public synchronized void addContribution(AutomationFilter automationFilter, boolean replace)
043            throws OperationException {
044        if (!replace && automationFilters.containsKey(automationFilter.getId())) {
045            throw new OperationException("An automation filter is already bound to: " + automationFilter.getId()
046                    + ". Use 'replace=true' to replace an existing automation filter");
047        }
048        super.addContribution(automationFilter);
049    }
050
051    @Override
052    public boolean isSupportingMerge() {
053        return false;
054    }
055
056    @Override
057    public String getContributionId(AutomationFilter contrib) {
058        return contrib.getId();
059    }
060
061    @Override
062    public void contributionUpdated(String id, AutomationFilter contrib, AutomationFilter newOrigContrib) {
063        automationFilters.put(id, contrib);
064        lookup = null;
065    }
066
067    @Override
068    public void contributionRemoved(String id, AutomationFilter origContrib) {
069        automationFilters.remove(id);
070        lookup = null;
071    }
072
073    @Override
074    public AutomationFilter clone(AutomationFilter orig) {
075        throw new UnsupportedOperationException();
076    }
077
078    @Override
079    public void merge(AutomationFilter src, AutomationFilter dst) {
080        throw new UnsupportedOperationException();
081    }
082
083    public Map<String, AutomationFilter> lookup() {
084        Map<String, AutomationFilter> _lookup = lookup;
085        if (_lookup == null) {
086            synchronized (this) {
087                lookup = new HashMap<>(automationFilters);
088                _lookup = lookup;
089            }
090        }
091        return _lookup;
092    }
093
094    public AutomationFilter getAutomationFilter(String id) {
095        return automationFilters.get(id);
096    }
097}