001/* 002 * Copyright 2012-2017 the original author or authors. 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 */ 016 017package org.springframework.boot.devtools.restart; 018 019/** 020 * Strategy used to handle launch failures. 021 * 022 * @author Phillip Webb 023 * @since 1.3.0 024 */ 025@FunctionalInterface 026public interface FailureHandler { 027 028 /** 029 * {@link FailureHandler} that always aborts. 030 */ 031 FailureHandler NONE = (failure) -> Outcome.ABORT; 032 033 /** 034 * Handle a run failure. Implementations may block, for example to wait until specific 035 * files are updated. 036 * @param failure the exception 037 * @return the outcome 038 */ 039 Outcome handle(Throwable failure); 040 041 /** 042 * Various outcomes for the handler. 043 */ 044 enum Outcome { 045 046 /** 047 * Abort the relaunch. 048 */ 049 ABORT, 050 051 /** 052 * Try again to relaunch the application. 053 */ 054 RETRY 055 056 } 057 058}