001/*
002 * (C) Copyright 2006-2014 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 */
016package org.nuxeo.ecm.core.redis;
017
018import org.nuxeo.runtime.model.SimpleContributionRegistry;
019
020public class SingletonContributionRegistry<T> extends SimpleContributionRegistry<T> {
021
022    protected T main;
023
024    @Override
025    public String getContributionId(T contrib) {
026        return "main";
027    }
028
029    @Override
030    public void contributionUpdated(String id, T contrib, T newOrigContrib) {
031        main = contrib;
032    }
033
034    @Override
035    public void contributionRemoved(String id, T origContrib) {
036        main = null;
037    }
038}