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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.action.support;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.ActionRequest;
import org.elasticsearch.action.ActionResponse;
import org.elasticsearch.tasks.Task;
/**
* A filter allowing to filter transport actions
*/
public interface ActionFilter {
/**
* The position of the filter in the chain. Execution is done from lowest order to highest.
*/
int order();
/**
* Enables filtering the execution of an action on the request side, either by sending a response through the
* {@link ActionListener} or by continuing the execution through the given {@link ActionFilterChain chain}
*/
void apply(Task task, String action, Request request,
ActionListener listener, ActionFilterChain chain);
/**
* A simple base class for injectable action filters that spares the implementation from handling the
* filter chain. This base class should serve any action filter implementations that doesn't require
* to apply async filtering logic.
*/
abstract class Simple implements ActionFilter {
@Override
public final void apply(Task task, String action, Request request,
ActionListener listener, ActionFilterChain chain) {
if (apply(action, request, listener)) {
chain.proceed(task, action, request, listener);
}
}
/**
* Applies this filter and returns {@code true} if the execution chain should proceed, or {@code false}
* if it should be aborted since the filter already handled the request and called the given listener.
*/
protected abstract boolean apply(String action, ActionRequest request, ActionListener listener);
}
}