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### What changes were proposed in this pull request? support pre event for event listener systems 1. add new `PreEvent` to represent Pre event and only `SYNC` event listeners could process `PreEvent` 2. keep `Event` as post event to keep compatibility. 3. `EventBus` dispatch event to corresponding event listeners. ### Why are the changes needed? Fix: #5112 ### Does this PR introduce _any_ user-facing change? no ### How was this patch tested? add UT
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core/src/main/java/org/apache/gravitino/listener/api/event/BaseEvent.java
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/* | ||
* 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. | ||
*/ | ||
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package org.apache.gravitino.listener.api.event; | ||
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import javax.annotation.Nullable; | ||
import org.apache.gravitino.NameIdentifier; | ||
import org.apache.gravitino.annotation.DeveloperApi; | ||
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/** | ||
* The abstract base class for all events. It encapsulates common information such as the user who | ||
* generated the event and the identifier for the resource associated with the event. Subclasses | ||
* should provide specific details related to their individual event types. | ||
*/ | ||
@DeveloperApi | ||
public abstract class BaseEvent { | ||
private final String user; | ||
@Nullable private final NameIdentifier identifier; | ||
private final long eventTime; | ||
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/** | ||
* Constructs an Event instance with the specified user and resource identifier details. | ||
* | ||
* @param user The user associated with this event. It provides context about who triggered the | ||
* event. | ||
* @param identifier The resource identifier associated with this event. This may refer to various | ||
* types of resources such as a metalake, catalog, schema, or table, etc. | ||
*/ | ||
protected BaseEvent(String user, NameIdentifier identifier) { | ||
this.user = user; | ||
this.identifier = identifier; | ||
this.eventTime = System.currentTimeMillis(); | ||
} | ||
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/** | ||
* Retrieves the user associated with this event. | ||
* | ||
* @return A string representing the user associated with this event. | ||
*/ | ||
public String user() { | ||
return user; | ||
} | ||
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/** | ||
* Retrieves the resource identifier associated with this event. | ||
* | ||
* <p>For list operations within a namespace, the identifier is the identifier corresponds to that | ||
* namespace. For metalake list operation, identifier is null. | ||
* | ||
* @return A NameIdentifier object that represents the resource, like a metalake, catalog, schema, | ||
* table, etc., associated with the event. | ||
*/ | ||
@Nullable | ||
public NameIdentifier identifier() { | ||
return identifier; | ||
} | ||
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/** | ||
* Returns the timestamp when the event was created. | ||
* | ||
* @return The event creation time in milliseconds since epoch. | ||
*/ | ||
public long eventTime() { | ||
return eventTime; | ||
} | ||
} |
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