001    /**
002     *
003     *  Licensed to the Apache Software Foundation (ASF) under one or more
004     *  contributor license agreements.  See the NOTICE file distributed with
005     *  this work for additional information regarding copyright ownership.
006     *  The ASF licenses this file to You under the Apache License, Version 2.0
007     *  (the "License"); you may not use this file except in compliance with
008     *  the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     *  Unless required by applicable law or agreed to in writing, software
013     *  distributed under the License is distributed on an "AS IS" BASIS,
014     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     *  See the License for the specific language governing permissions and
016     *  limitations under the License.
017     */
018    package org.apache.geronimo.clustering.wadi;
019    
020    import org.apache.geronimo.gbean.GBeanInfo;
021    import org.apache.geronimo.gbean.GBeanInfoBuilder;
022    import org.apache.geronimo.gbean.GBeanLifecycle;
023    import org.apache.geronimo.j2ee.j2eeobjectnames.NameFactory;
024    import org.codehaus.wadi.replication.strategy.BackingStrategy;
025    import org.codehaus.wadi.replication.strategy.BackingStrategyFactory;
026    import org.codehaus.wadi.replication.strategy.RoundRobinBackingStrategyFactory;
027    
028    /**
029     * 
030     * @version $Rev$ $Date$
031     */
032    public class RoundRobinBackingStrategyFactoryGBean implements BackingStrategyFactory, GBeanLifecycle {
033        private final int nbReplica;
034        
035        private BackingStrategyFactory strategyFactory;
036        
037        public RoundRobinBackingStrategyFactoryGBean(int nbReplica) {
038            this.nbReplica = nbReplica;
039        }
040    
041        public BackingStrategy factory() {
042            return strategyFactory.factory();
043        }
044    
045        public void doFail() {
046            strategyFactory = null;
047        }
048    
049        public void doStart() throws Exception {
050            strategyFactory = new RoundRobinBackingStrategyFactory(nbReplica);
051        }
052    
053        public void doStop() throws Exception {
054            strategyFactory = null;
055        }
056    
057        
058        public static final GBeanInfo GBEAN_INFO;
059        
060        public static final String GBEAN_ATTR_NB_REPLICA = "nbReplica";
061        
062        static {
063            GBeanInfoBuilder infoBuilder = GBeanInfoBuilder.createStatic(RoundRobinBackingStrategyFactoryGBean.class, 
064                    NameFactory.GERONIMO_SERVICE);
065            
066            infoBuilder.addAttribute(GBEAN_ATTR_NB_REPLICA, int.class, true);
067            
068            infoBuilder.addInterface(BackingStrategyFactory.class);
069    
070            infoBuilder.setConstructor(new String[] {GBEAN_ATTR_NB_REPLICA});
071            
072            GBEAN_INFO = infoBuilder.getBeanInfo();
073        }
074        
075        public static GBeanInfo getGBeanInfo() {
076            return GBEAN_INFO;
077        }
078    }