content: package act.xio.undertow;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.ActResponse;
  import act.app.ActionContext;
  import act.app.App;
  import act.conf.AppConfig;
  import act.sys.SystemAvailabilityMonitor;
  import act.xio.NetworkHandler;
  import io.undertow.server.HttpHandler;
  import io.undertow.server.HttpServerExchange;
  import org.osgl.http.H;
  import org.osgl.util.E;
  
  import java.nio.ByteBuffer;
  
  /**
   * Dispatch undertow request to Act application
   */
  public class ActHttpHandler implements HttpHandler {
  
      private final NetworkHandler client;
  
      private static final ByteBuffer SERVICE_UNAVAILABLE = ByteBuffer.wrap("503 Service Unavailable".getBytes());
  
      public ActHttpHandler(NetworkHandler client) {
          E.NPE(client);
          this.client = client;
      }
  
      @Override
      public void handleRequest(final HttpServerExchange exchange) {
          if (!SystemAvailabilityMonitor.isAvailable()) {
              exchange.setStatusCode(503);
              exchange.getResponseSender().send(SERVICE_UNAVAILABLE.duplicate());
              return;
          }
          ActionContext ctx = createActionContext(exchange);
          client.handle(ctx, new UndertowNetworkDispatcher(exchange));
      }
  
      private ActionContext createActionContext(HttpServerExchange exchange) {
          App app = client.app();
          AppConfig config = app.config();
          return ActionContext.create(app, req(exchange, config), resp(exchange, config));
      }
  
      private H.Request req(HttpServerExchange exchange, AppConfig config) {
          return new UndertowRequest(exchange, config);
      }
  
      private ActResponse<?> resp(HttpServerExchange exchange, AppConfig config) {
          return new UndertowResponse(exchange, config);
      }
  
  }
  