spring ApplicationEvent 源码
spring ApplicationEvent 代码
文件路径：/spring-context/src/main/java/org/springframework/context/ApplicationEvent.java
/*
* Copyright 2002-2021 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
*
* https://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.context;
import java.time.Clock;
import java.util.EventObject;
/**
* Class to be extended by all application events. Abstract as it
* doesn't make sense for generic events to be published directly.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @see org.springframework.context.ApplicationListener
* @see org.springframework.context.event.EventListener
*/
public abstract class ApplicationEvent extends EventObject {
/** use serialVersionUID from Spring 1.2 for interoperability. */
private static final long serialVersionUID = 7099057708183571937L;
/** System time when the event happened. */
private final long timestamp;
/**
* Create a new {@code ApplicationEvent} with its {@link #getTimestamp() timestamp}
* set to {@link System#currentTimeMillis()}.
* @param source the object on which the event initially occurred or with
* which the event is associated (never {@code null})
* @see #ApplicationEvent(Object, Clock)
*/
public ApplicationEvent(Object source) {
super(source);
this.timestamp = System.currentTimeMillis();
}
/**
* Create a new {@code ApplicationEvent} with its {@link #getTimestamp() timestamp}
* set to the value returned by {@link Clock#millis()} in the provided {@link Clock}.
* <p>This constructor is typically used in testing scenarios.
* @param source the object on which the event initially occurred or with
* which the event is associated (never {@code null})
* @param clock a clock which will provide the timestamp
* @since 5.3.8
* @see #ApplicationEvent(Object)
*/
public ApplicationEvent(Object source, Clock clock) {
super(source);
this.timestamp = clock.millis();
}
/**
* Return the time in milliseconds when the event occurred.
* @see #ApplicationEvent(Object)
* @see #ApplicationEvent(Object, Clock)
*/
public final long getTimestamp() {
return this.timestamp;
}
}
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