org.springframework.context.ApplicationEvent.java Source code

Introduction

Here is the source code for org.springframework.context.ApplicationEvent.java

Source

/*
 * Copyright 2002-2019 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.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}.
     * @param source the object on which the event initially occurred or with
     * which the event is associated (never {@code null})
     */
    public ApplicationEvent(Object source) {
        super(source);
        this.timestamp = System.currentTimeMillis();
    }

    /**
     * Return the system time in milliseconds when the event occurred.
     */
    public final long getTimestamp() {
        return this.timestamp;
    }

}