ActionFilterChain.java example

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 * the Apache License, Version 2.0 (the "License"); you may
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 * 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,
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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 chain allowing to continue and process the transport action request
 */
public interface ActionFilterChain<Request extends ActionRequest, Response extends ActionResponse> {

    /**
     * Continue processing the request. Should only be called if a response has not been sent through
     * the given {@link ActionListener listener}
     */
    void proceed(Task task, String action, Request request, ActionListener<Response> listener);
}