FirehoseEvent.java

/*
 * Copyright 2021 Global Crop Diversity Trust
 *
 * Licensed 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.genesys.server.component.firehose;

import org.jetbrains.annotations.NotNull;

import java.io.Serializable;
import java.time.Instant;
import java.util.Objects;

/**
 *
 * @author Artem Hrybeniuk
 */
public class FirehoseEvent implements Comparable<FirehoseEvent>, Serializable {

	private static final long serialVersionUID = 5481828485125320364L;

	private Class<?> clazz; // TODO Maybe just className?
	private Long id;
	private String key;

	private Instant timestamp;

	transient private Object entity;

	private EventType eventType;


	public static enum EventType {
		CREATE, UPDATE, DELETE
	}

	public FirehoseEvent(Class<?> clazz, Long id, Instant timestamp, EventType eventType) {
		this.clazz = clazz;
		this.id = id;
		this.key = (this.id == null ? "null" : this.id) + ":" + (this.clazz == null ? "null" : this.clazz.getName());

		this.timestamp = timestamp;
		this.eventType = eventType;
	}

	public FirehoseEvent(Class<?> clazz, Long id, Instant timestamp, EventType eventType, Object entity) {
		this.clazz = clazz;
		this.id = id;
		this.key = (this.id == null ? "null" : this.id) + ":" + (this.clazz == null ? "null" : this.clazz.getName());

		this.timestamp = timestamp;
		this.eventType = eventType;
		this.entity = entity;
	}

	public Class<?> getClazz() {
		return clazz;
	}

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
		this.key = (this.id == null ? "null" : this.id) + ":" + (this.clazz == null ? "null" : this.clazz.getName());
	}

	public Instant getTimestamp() {
		return timestamp;
	}

	public void updateTimestamp(Instant timestamp) {
		this.timestamp = timestamp;
	}

	public Object getEntity() {
		return entity;
	}

	public void setEntity(Object entity) {
		this.entity = entity;
	}

	public EventType getEventType() {
		return eventType;
	}

	@Override
	public String toString() {
		return "Firehose." + this.eventType + " for type " + this.clazz + " id=" + this.id + " @" + this.timestamp;
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) return true;
		if (!(o instanceof FirehoseEvent)) return false;
		FirehoseEvent that = (FirehoseEvent) o;
		return Objects.equals(timestamp, that.timestamp) && Objects.equals(id, that.id) && Objects.equals(clazz, that.clazz);
	}

	@Override
	public int hashCode() {
		return Objects.hash(timestamp, clazz, id);
	}

	/**
	 *
	 * Compare by timestamp, then id, then clazz
	 */
	@Override
	public int compareTo(@NotNull FirehoseEvent firehoseEvent) {
		if (this.timestamp.equals(firehoseEvent.timestamp)) {
			if (firehoseEvent.id == null && this.id == null) {
				return 0;
			} else if (firehoseEvent.id == null) {
				return -1;
			} else if (this.id == null) {
				return 1;
			} else {
				return (int) (this.id - firehoseEvent.id);
			}
		} else {
			return this.timestamp.compareTo(firehoseEvent.timestamp);
		}
	}

	/**
	 * Match by id and clazz
	 *
	 * @param b
	 * @return
	 */
	public boolean sameReference(FirehoseEvent b) {
		if (b == null) {
			return false;
		}
		return Objects.equals(key, b.key);
	}

	/**
	 * Object key
	 *
	 * @return id+className
	 */
	public String getKey() {
		return this.key;
	}
}