001    // Copyright 2007 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.ioc.internal;
016    
017    import org.apache.tapestry5.ioc.def.ServiceDef;
018    import org.apache.tapestry5.ioc.services.ServiceActivityScoreboard;
019    import org.apache.tapestry5.ioc.services.Status;
020    
021    /**
022     * Used to update the status of services defined by the {@link ServiceActivityScoreboard}.
023     */
024    public interface ServiceActivityTracker
025    {
026    
027        /**
028         * Defines a service in the tracker with an initial status.
029         *
030         * @param serviceDef    the service being defined
031         * @param initialStatus typically {@link Status#BUILTIN} or {@link Status#DEFINED}
032         */
033        void define(ServiceDef serviceDef, Status initialStatus);
034    
035        /**
036         * Updates the status for the service.
037         *
038         * @param serviceId identifies the service, which must be previously defined
039         * @param status    the new status value
040         */
041        void setStatus(String serviceId, Status status);
042    }