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 019import java.net.URL; 020 021/** 022 * Strategy interface used to initialize a {@link Restarter}. 023 * 024 * @author Phillip Webb 025 * @since 1.3.0 026 * @see DefaultRestartInitializer 027 */ 028@FunctionalInterface 029public interface RestartInitializer { 030 031 /** 032 * {@link RestartInitializer} that doesn't return any URLs. 033 */ 034 RestartInitializer NONE = (thread) -> null; 035 036 /** 037 * Return the initial set of URLs for the {@link Restarter} or {@code null} if no 038 * initial restart is required. 039 * @param thread the source thread 040 * @return initial URLs or {@code null} 041 */ 042 URL[] getInitialUrls(Thread thread); 043 044}