001/* 002 * Configurate 003 * Copyright (C) zml and Configurate contributors 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * 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 */ 017package org.spongepowered.configurate.reactive; 018 019/** 020 * A listener to events that may be called by an {@link Publisher}. 021 * 022 * <p>For every publisher this subscriber is subscribed to, the subscriber will 023 * only process one event at a time -- effectively, within a single publisher 024 * this subscriber does not have to be aware of concurrent effects. 025 * 026 * @param <V> the value that will be received 027 * @since 4.0.0 028 */ 029@FunctionalInterface 030public interface Subscriber<V> { 031 032 /** 033 * Called to submit a new item. 034 * 035 * @param item the item available 036 * @since 4.0.0 037 */ 038 void submit(V item); 039 040 /** 041 * When an error occurs while subscribing to an {@link Publisher}, or is 042 * thrown during the execution of {@link #submit(Object)} that is not 043 * otherwise handled, this method will be called with the error. The 044 * associated {@link Publisher} will not send further update signals after 045 * an error is thrown. 046 * 047 * @param thrown the exception thrown 048 * @since 4.0.0 049 */ 050 default void onError(Throwable thrown) { 051 final Thread t = Thread.currentThread(); 052 t.getUncaughtExceptionHandler().uncaughtException(t, thrown); 053 } 054 055 /** 056 * When the {@link Publisher} this is subscribed to closes without error, 057 * this method will be called. 058 * 059 * @since 4.0.0 060 */ 061 default void onClose() { 062 // no-op 063 } 064 065}