| /* |
| * 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.samza.startpoint; |
| |
| import com.google.common.base.MoreObjects; |
| import com.google.common.base.Objects; |
| import java.time.Instant; |
| import org.apache.samza.annotation.InterfaceStability; |
| import org.codehaus.jackson.annotate.JsonTypeInfo; |
| |
| /** |
| * Startpoint represents a position in a stream partition. |
| */ |
| @InterfaceStability.Evolving |
| @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "@type") |
| public abstract class Startpoint { |
| // TODO: Remove the @JsonTypeInfo annotation and use the ObjectMapper#enableDefaultTyping method in |
| // StartpointObjectMapper after upgrading jackson version. That method does not add the appropriate type info to the |
| // serialized json with the current version (1.9.13) of jackson. |
| |
| private final long creationTimestamp; |
| |
| Startpoint() { |
| this(Instant.now().toEpochMilli()); |
| } |
| |
| Startpoint(long creationTimestamp) { |
| this.creationTimestamp = creationTimestamp; |
| } |
| |
| /** |
| * The timestamp when this {@link Startpoint} was written to the storage layer. |
| * @return a timestamp in epoch milliseconds. |
| */ |
| public long getCreationTimestamp() { |
| return creationTimestamp; |
| } |
| |
| /** |
| * Applies the {@link StartpointVisitor}'s visit methods to the {@link Startpoint} |
| * and returns the result of that operation. |
| * @param input the metadata associated with the startpoint. |
| * @param startpointVisitor the visitor of the startpoint. |
| * @return the result of applying the visitor on startpoint. |
| */ |
| public abstract <IN, OUT> OUT apply(IN input, StartpointVisitor<IN, OUT> startpointVisitor); |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(this).toString(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| Startpoint that = (Startpoint) o; |
| return Objects.equal(creationTimestamp, that.creationTimestamp); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(creationTimestamp); |
| } |
| } |