| /* |
| * 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.streaming.tests; |
| |
| import org.apache.flink.runtime.state.ttl.TtlTimeProvider; |
| |
| import javax.annotation.concurrent.NotThreadSafe; |
| |
| import java.io.Serializable; |
| |
| /** |
| * A stub implementation of a {@link TtlTimeProvider} which guarantees that |
| * processing time increases monotonically. |
| */ |
| @NotThreadSafe |
| final class MonotonicTTLTimeProvider implements TtlTimeProvider, Serializable { |
| |
| private static final long serialVersionUID = 1L; |
| |
| /* |
| * The following variables are static because the whole TTLTimeProvider will go |
| * through serialization and, eventually, the state backend and the task executing |
| * the TtlVerifyUpdateFunction will have different instances of it. |
| * |
| * If these were not static, then the TtlVerifyUpdateFunction would e.g. freeze |
| * the time, but the backend would not be notified about it, resulting in inconsistent |
| * state. |
| * |
| * If the number of task slots per TM changes, then we may need to add also synchronization. |
| */ |
| |
| private static boolean timeIsFrozen = false; |
| |
| private static long lastReturnedProcessingTime = Long.MIN_VALUE; |
| |
| @Override |
| public long currentTimestamp() { |
| if (timeIsFrozen && lastReturnedProcessingTime != Long.MIN_VALUE) { |
| return lastReturnedProcessingTime; |
| } |
| |
| timeIsFrozen = true; |
| |
| final long currentProcessingTime = System.currentTimeMillis(); |
| if (currentProcessingTime < lastReturnedProcessingTime) { |
| return lastReturnedProcessingTime; |
| } |
| |
| lastReturnedProcessingTime = currentProcessingTime; |
| return lastReturnedProcessingTime; |
| } |
| |
| long unfreezeTime() { |
| timeIsFrozen = false; |
| return lastReturnedProcessingTime; |
| } |
| } |