| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.flink.statefun.flink.core.functions; |
| |
| import java.util.OptionalLong; |
| import java.util.function.Consumer; |
| import org.apache.flink.statefun.flink.core.message.Message; |
| |
| interface DelayedMessagesBuffer { |
| |
| /** Add a message to be fired at a specific timestamp */ |
| void add(Message message, long untilTimestamp); |
| |
| /** Apply @fn for each delayed message that is meant to be fired at @timestamp. */ |
| void forEachMessageAt(long timestamp, Consumer<Message> fn); |
| |
| /** |
| * @param token a message cancellation token to delete. |
| * @return an optional timestamp that this message was meant to be fired at. The timestamp will be |
| * present only if this message was the last message registered to fire at that timestamp. |
| * (hence: safe to clear any underlying timer) |
| */ |
| OptionalLong removeMessageByCancellationToken(String token); |
| } |