content: /**
   * 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 org.apache.aurora.common.net.http.handlers;
  
  import java.io.IOException;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.ws.rs.POST;
  import javax.ws.rs.Path;
  import javax.ws.rs.Produces;
  import javax.ws.rs.core.Context;
  import javax.ws.rs.core.MediaType;
  
  import com.google.common.base.Preconditions;
  import com.google.inject.Inject;
  import com.google.inject.name.Named;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A servlet that provides a way to remotely terminate the running process immediately.
   */
  @Path("/abortabortabort")
  public class AbortHandler {
  
    /**
     * A {@literal @Named} binding key for the QuitHandler listener.
     */
    public static final String ABORT_HANDLER_KEY =
        "com.twitter.common.net.http.handlers.AbortHandler.listener";
  
    private static final Logger LOG = LoggerFactory.getLogger(AbortHandler.class);
  
    private final Runnable abortListener;
  
    /**
     * Constructs a new AbortHandler that will notify the given {@code abortListener} when the servlet
     * is accessed.  It is the responsibility of the listener to initiate an immediate shutdown of
     * the system.
     *
     * @param abortListener Runnable to notify when the servlet is accessed.
     */
    @Inject
    public AbortHandler(@Named(ABORT_HANDLER_KEY) Runnable abortListener) {
      this.abortListener = Preconditions.checkNotNull(abortListener);
    }
  
    @POST
    @Produces(MediaType.TEXT_PLAIN)
    public void abort(@Context HttpServletRequest req) throws IOException {
      LOG.info("Received abort HTTP signal from {} ({})", req.getRemoteAddr(), req.getRemoteHost());
      abortListener.run();
    }
  }
  