/* * 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.table.sources.wmstrategies; import org.apache.flink.annotation.PublicEvolving; import org.apache.flink.table.descriptors.Descriptor; import org.apache.flink.table.descriptors.Rowtime; import org.apache.flink.table.utils.EncodingUtils; import java.io.Serializable; import java.util.HashMap; import java.util.Map; /** * Provides a strategy to generate watermarks for a rowtime attribute. * * <p>A watermark strategy is either a {@code PeriodicWatermarkAssigner} or * {@code PunctuatedWatermarkAssigner}. */ @PublicEvolving public abstract class WatermarkStrategy implements Serializable, Descriptor { /** * This method is a default implementation that uses java serialization and it is discouraged. * All implementation should provide a more specific set of properties. */ @Override public Map<String, String> toProperties() { Map<String, String> properties = new HashMap<>(); properties.put(Rowtime.ROWTIME_WATERMARKS_TYPE, Rowtime.ROWTIME_WATERMARKS_TYPE_VALUE_CUSTOM); properties.put(Rowtime.ROWTIME_WATERMARKS_CLASS, this.getClass().getName()); properties.put(Rowtime.ROWTIME_WATERMARKS_SERIALIZED, EncodingUtils.encodeObjectToString(this)); return properties; } }