001// Copyright 2004, 2005 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 015package org.apache.hivemind.impl.servicemodel; 016 017import org.apache.hivemind.impl.ConstructableServicePoint; 018 019/** 020 * Implementation of {@link org.apache.hivemind.internal.ServiceModel} for the primitive services 021 * (that do not include the standard deferred instantiation proxy). 022 * 023 * @author Howard Lewis Ship 024 */ 025public final class PrimitiveServiceModel extends AbstractServiceModelImpl 026{ 027 private Object _constructedService; 028 029 public PrimitiveServiceModel(ConstructableServicePoint servicePoint) 030 { 031 super(servicePoint); 032 } 033 034 /** 035 * Constructs the service (the first time this is invoked) and returns it. 036 */ 037 public synchronized Object getService() 038 { 039 if (_constructedService == null) 040 { 041 _constructedService = constructServiceImplementation(); 042 043 registerWithShutdownCoordinator(_constructedService); 044 } 045 046 // Note: if the service's declared interface is a class AND 047 // the service has interceptors, then it will not be possible 048 // to cast the result (since the returned interceptor will implement 049 // the synthetic service interface). 050 051 return _constructedService; 052 } 053 054 /** 055 * Invokes {@link #getService()} to ensure that the core service implementation has been 056 * instantiated. 057 */ 058 public void instantiateService() 059 { 060 getService(); 061 } 062 063}