001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.xbean.kernel; 018 019 import java.util.Set; 020 021 /** 022 * The StartStrategy interface is used to assist the kernel in determining how to handle problems that occur while 023 * starting a service. 024 * 025 * @author Dain Sundstrom 026 * @version $Id$ 027 * @since 2.0 028 */ 029 public interface StartStrategy { 030 /** 031 * Determines if the kernel should wait for the unsatified conditions to be satisfied. 032 * 033 * @param serviceName the name of the service that has the unsatisfied condtions 034 * @param conditions the unsatisfied condtions 035 * @return true if the kernel should wait for the conditions to be satisfied; false if the strategy would like 036 * silently leave the service in the starting state 037 * @throws UnsatisfiedConditionsException the the strategy would like to leave the service in the starting state 038 * and throw an exception the caller 039 * @throws UnregisterServiceException if the strategy would like to ignore the unsatisfied conditions and continue to 040 * destry the service 041 */ 042 boolean waitForUnsatisfiedConditions(ServiceName serviceName, Set conditions) throws UnsatisfiedConditionsException, UnregisterServiceException; 043 044 /** 045 * Handle the start error. The strategy can rethrow the exception, throw an {@link UnregisterServiceException}, or 046 * return. If this method rethrows the exception, the service will be destroyed and the exception will be thrown to 047 * the caller. If an UnregisterServiceException is thrown, the kernel will unregister the service and rethrow 048 * {@link UnregisterServiceException#getCause()}. If this method returns without throwing an exception, the kernel 049 * will pass the exception to the service monitor for processing and leave the service in the starting state. 050 * 051 * @param serviceName the name of the service that has the error 052 * @param startError the Exception or Error 053 * @throws UnregisterServiceException if the strategy would like the service to be destroyed and unregistered 054 * @throws Exception if the strategy would like to destroy the service and throw the exception to the caller 055 */ 056 void startError(ServiceName serviceName, Throwable startError) throws UnregisterServiceException, Exception; 057 }