001/*
002 * (C) Copyright 2012 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 *     Anahide Tchertchian
018 */
019package org.nuxeo.ecm.automation.core.impl;
020
021import java.util.HashMap;
022import java.util.Map;
023
024import org.nuxeo.ecm.automation.OperationException;
025import org.nuxeo.ecm.automation.OperationType;
026import org.nuxeo.ecm.automation.core.annotations.Operation;
027import org.nuxeo.runtime.model.ContributionFragmentRegistry;
028
029/**
030 * @since 5.6
031 */
032public class OperationTypeRegistry extends ContributionFragmentRegistry<OperationType> {
033
034    /**
035     * Modifiable operation registry. Modifying the registry is using a lock and it's thread safe. Modifications are
036     * removing the cache.
037     */
038    protected final Map<String, OperationType> operations = new HashMap<String, OperationType>();
039
040    /**
041     * Read only cache for operation lookup. Thread safe. Not using synchronization if cache already created.
042     */
043    protected volatile Map<String, OperationType> lookup;
044
045    @Override
046    public String getContributionId(OperationType contrib) {
047        return contrib.getId();
048    }
049
050    public synchronized void addContribution(OperationType op, boolean replace) throws OperationException {
051        if (!replace && operations.containsKey(op.getId())) {
052            throw new OperationException("An operation is already bound to: " + op.getId()
053                    + ". Use 'replace=true' to replace an existing operation");
054        }
055        super.addContribution(op);
056    }
057
058    @Override
059    public void contributionUpdated(String id, OperationType contrib, OperationType newOrigContrib) {
060        operations.put(id, contrib);
061        for (String alias : contrib.getAliases()) {
062            operations.put(alias, contrib);
063        }
064        lookup = null;
065    }
066
067    @Override
068    public void contributionRemoved(String id, OperationType origContrib) {
069        operations.remove(id);
070        lookup = null;
071    }
072
073    @Override
074    public boolean isSupportingMerge() {
075        return false;
076    }
077
078    @Override
079    public OperationType clone(OperationType orig) {
080        throw new UnsupportedOperationException();
081    }
082
083    @Override
084    public void merge(OperationType src, OperationType dst) {
085        throw new UnsupportedOperationException();
086    }
087
088    // API
089
090    public OperationType getOperationType(Class<?> key) {
091        return lookup().get(key.getAnnotation(Operation.class).id());
092    }
093
094    public Map<String, OperationType> lookup() {
095        if (lookup == null) {
096            synchronized (this) {
097                if (lookup == null) {
098                    lookup = new HashMap<String, OperationType>(operations);
099                }
100            }
101        }
102        return lookup;
103    }
104
105}