RemoteApplicationEvent.java

/*
 * Copyright 2013-2017 the original author or authors.
 *
 * 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.springframework.cloud.bus.event;

import java.util.UUID;

import org.springframework.context.ApplicationEvent;
import org.springframework.util.StringUtils;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.annotation.JsonTypeInfo;

/**
 * @author Spencer Gibb
 */
@SuppressWarnings("serial")
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
@JsonIgnoreProperties("source")
public abstract class RemoteApplicationEvent extends ApplicationEvent {
	private static final Object TRANSIENT_SOURCE = new Object();
	private final String originService;
	private final String destinationService;
	private final String id;

	protected RemoteApplicationEvent() {
		// for serialization libs like jackson
		this(TRANSIENT_SOURCE, null, null);
	}

	protected RemoteApplicationEvent(Object source, String originService,
			String destinationService) {
		super(source);
		this.originService = originService;
		if (destinationService == null) {
			destinationService = "**";
		}
		// If the destinationService is not already a wildcard, match everything that follows
		// if there at most two path elements, and last element is not a global wildcard already
		if (!"**".equals(destinationService)) {
			if (StringUtils.countOccurrencesOf(destinationService, ":") <= 1
					&& !StringUtils.endsWithIgnoreCase(destinationService, ":**")) {
				// All instances of the destination unless specifically requested
				destinationService = destinationService + ":**";
			}
		}
		this.destinationService = destinationService;
		this.id = UUID.randomUUID().toString();
	}

	protected RemoteApplicationEvent(Object source, String originService) {
		this(source, originService, null);
	}

	public String getOriginService() {
		return originService;
	}

	public String getDestinationService() {
		return destinationService;
	}

	public String getId() {
		return id;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result
				+ ((destinationService == null) ? 0 : destinationService.hashCode());
		result = prime * result + ((id == null) ? 0 : id.hashCode());
		result = prime * result
				+ ((originService == null) ? 0 : originService.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		RemoteApplicationEvent other = (RemoteApplicationEvent) obj;
		if (destinationService == null) {
			if (other.destinationService != null)
				return false;
		}
		else if (!destinationService.equals(other.destinationService))
			return false;
		if (id == null) {
			if (other.id != null)
				return false;
		}
		else if (!id.equals(other.id))
			return false;
		if (originService == null) {
			if (other.originService != null)
				return false;
		}
		else if (!originService.equals(other.originService))
			return false;
		return true;
	}
}