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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.
 */

package org.elasticsearch.rest;

import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.xcontent.XContent;

/**
 * Handler for REST requests
 */
public interface RestHandler {

    /**
     * Handles a rest request.
     * @param request The request to handle
     * @param channel The channel to write the request response to
     * @param client A client to use to make internal requests on behalf of the original request
     */
    void handleRequest(RestRequest request, RestChannel channel, NodeClient client) throws Exception;

    default boolean canTripCircuitBreaker() {
        return true;
    }

    /**
     * Indicates if the RestHandler supports content as a stream. A stream would be multiple objects delineated by
     * {@link XContent#streamSeparator()}. If a handler returns true this will affect the types of content that can be sent to
     * this endpoint.
     */
    default boolean supportsContentStream() {
        return false;
    }

    /**
     * Indicates if the RestHandler supports working with pooled buffers. If the request handler will not escape the return
     * {@link RestRequest#content()} or any buffers extracted from it then there is no need to make a copies of any pooled buffers in the
     * {@link RestRequest} instance before passing a request to this handler. If this instance does not support pooled/unsafe buffers
     * {@link RestRequest#ensureSafeBuffers()} should be called on any request before passing it to {@link #handleRequest}.
     *
     * @return true iff the handler supports requests that make use of pooled buffers
     */
    default boolean allowsUnsafeBuffers() {
        return false;
    }
}