| /** |
| * 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 |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * 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.eagle.alert.engine.sorter; |
| |
| import java.io.Serializable; |
| |
| /** |
| * By default, we could keep the current time clock in memory, |
| * Eventually we may need to consider the global time synchronization across all nodes |
| * |
| * <p>TODO: maybe need to synchronize time clock globally</p> |
| * |
| * <p>1) When to initialize window according to start time |
| * 2) When to close expired window according to current time |
| * 3) Automatically tick periodically as the single place for control lock.</p> |
| */ |
| public interface StreamTimeClockManager extends StreamTimeClockTrigger, Serializable { |
| /** |
| * @return StreamTimeClock instance. |
| */ |
| StreamTimeClock createStreamTimeClock(String streamId); |
| |
| StreamTimeClock getStreamTimeClock(String streamId); |
| |
| void removeStreamTimeClock(String streamId); |
| } |