001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.reef.wake.rx.exception; 020 021/** 022 * It is illegal to call onError() or onCompleted() when a call to onNext() is 023 * still outstanding, or to call onNext(), onError() or onCompleted() after a 024 * call to onError() or onCompleted() has been dispatched. Observers may throw 025 * an ObserverCompleted exception whenever this API is violated. Violating the 026 * API leaves the Observer (and any resources that it holds) in an undefined 027 * state, and throwing ObserverCompleted exceptions is optional. 028 * <p> 029 * Callers receiving this exception should simply pass it up the stack to the 030 * Aura runtime. They should not attempt to forward it on to upstream or 031 * downstream stages. The easiest way to do this is to ignore the exception 032 * entirely. 033 */ 034public class ObserverCompletedException extends IllegalStateException { 035 036 private static final long serialVersionUID = 1L; 037 038}