001/*
002 * (C) Copyright 2012 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.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 *     Anahide Tchertchian
016 */
017package org.nuxeo.ecm.automation.core.impl;
018
019import java.util.HashMap;
020import java.util.Map;
021
022import org.nuxeo.ecm.automation.OperationException;
023import org.nuxeo.ecm.automation.OperationType;
024import org.nuxeo.ecm.automation.core.annotations.Operation;
025import org.nuxeo.runtime.model.ContributionFragmentRegistry;
026
027/**
028 * @since 5.6
029 */
030public class OperationTypeRegistry extends ContributionFragmentRegistry<OperationType> {
031
032    /**
033     * Modifiable operation registry. Modifying the registry is using a lock and it's thread safe. Modifications are
034     * removing the cache.
035     */
036    protected final Map<String, OperationType> operations = new HashMap<String, OperationType>();
037
038    /**
039     * Read only cache for operation lookup. Thread safe. Not using synchronization if cache already created.
040     */
041    protected volatile Map<String, OperationType> lookup;
042
043    @Override
044    public String getContributionId(OperationType contrib) {
045        return contrib.getId();
046    }
047
048    public synchronized void addContribution(OperationType op, boolean replace) throws OperationException {
049        if (!replace && operations.containsKey(op.getId())) {
050            throw new OperationException("An operation is already bound to: " + op.getId()
051                    + ". Use 'replace=true' to replace an existing operation");
052        }
053        super.addContribution(op);
054    }
055
056    @Override
057    public void contributionUpdated(String id, OperationType contrib, OperationType newOrigContrib) {
058        operations.put(id, contrib);
059        for (String alias : contrib.getAliases()) {
060            operations.put(alias, contrib);
061        }
062        lookup = null;
063    }
064
065    @Override
066    public void contributionRemoved(String id, OperationType origContrib) {
067        operations.remove(id);
068        lookup = null;
069    }
070
071    @Override
072    public boolean isSupportingMerge() {
073        return false;
074    }
075
076    @Override
077    public OperationType clone(OperationType orig) {
078        throw new UnsupportedOperationException();
079    }
080
081    @Override
082    public void merge(OperationType src, OperationType dst) {
083        throw new UnsupportedOperationException();
084    }
085
086    // API
087
088    public OperationType getOperationType(Class<?> key) {
089        return operations.get(key.getAnnotation(Operation.class).id());
090    }
091
092    public Map<String, OperationType> lookup() {
093        Map<String, OperationType> _lookup = lookup;
094        if (_lookup == null) {
095            synchronized (this) {
096                lookup = new HashMap<String, OperationType>(operations);
097                _lookup = lookup;
098            }
099        }
100        return _lookup;
101    }
102
103}