content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF 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.apache.bookkeeper.server.http.service;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  import java.util.List;
  import org.apache.bookkeeper.bookie.GarbageCollectionStatus;
  import org.apache.bookkeeper.common.util.JsonUtil;
  import org.apache.bookkeeper.conf.ServerConfiguration;
  import org.apache.bookkeeper.http.HttpServer;
  import org.apache.bookkeeper.http.service.HttpEndpointService;
  import org.apache.bookkeeper.http.service.HttpServiceRequest;
  import org.apache.bookkeeper.http.service.HttpServiceResponse;
  import org.apache.bookkeeper.proto.BookieServer;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * HttpEndpointService that handle get garbage collection details service.
   *
   * <p>Get Garbage Collection status, the output would be like:
   *        [ {
   *           "forceCompacting" : false,
   *           "majorCompacting" : false,
   *           "minorCompacting" : false,
   *           "lastMajorCompactionTime" : 1544578144944,
   *           "lastMinorCompactionTime" : 1544578144944,
   *           "majorCompactionCounter" : 1,
   *           "minorCompactionCounter" : 0
   *         } ]
   */
  public class GCDetailsService implements HttpEndpointService {
  
      static final Logger LOG = LoggerFactory.getLogger(GCDetailsService.class);
  
      protected ServerConfiguration conf;
      protected BookieServer bookieServer;
  
      public GCDetailsService(ServerConfiguration conf, BookieServer bookieServer) {
          checkNotNull(conf);
          checkNotNull(bookieServer);
          this.conf = conf;
          this.bookieServer = bookieServer;
      }
  
      @Override
      public HttpServiceResponse handle(HttpServiceRequest request) throws Exception {
          HttpServiceResponse response = new HttpServiceResponse();
  
          if (HttpServer.Method.GET == request.getMethod()) {
              List<GarbageCollectionStatus> details = bookieServer.getBookie()
                  .getLedgerStorage().getGarbageCollectionStatus();
  
              String jsonResponse = JsonUtil.toJson(details);
              if (LOG.isDebugEnabled()) {
                  LOG.debug("output body:" + jsonResponse);
              }
              response.setBody(jsonResponse);
              response.setCode(HttpServer.StatusCode.OK);
              return response;
          } else {
              response.setCode(HttpServer.StatusCode.NOT_FOUND);
              response.setBody("Only support GET method to retrieve GC details."
                  + " If you want to trigger gc, send a POST to gc endpoint.");
              return response;
          }
      }
  }
  