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Netty based path router

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/*
 * Copyright © 2014 Cask Data, Inc.
 *
 * 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
 *
 * 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 co.cask.http;

import org.jboss.netty.handler.codec.http.HttpRequest;

/**
 * A base implementation of {@link HttpHandler} that provides a method for sending a request to other
 * handlers that exist in the same server.
 */
public abstract class AbstractHttpHandler implements HttpHandler {
  private HttpResourceHandler httpResourceHandler;

  @Override
  public void init(HandlerContext context) {
    this.httpResourceHandler = context.getHttpResourceHandler();
  }

  @Override
  public void destroy(HandlerContext context) {
    // No-op
  }

  /**
   * Send a request to another handler internal to the server, getting back the response body and response code.
   *
   * @param request request to send to another handler.
   * @return {@link BasicInternalHttpResponse} containing the response code and body.
   */
  protected InternalHttpResponse sendInternalRequest(HttpRequest request) {
    InternalHttpResponder responder = new InternalHttpResponder();
    httpResourceHandler.handle(request, responder);
    return responder.getResponse();
  }
}