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.HashMap;
  import java.util.Map;
  import org.apache.bookkeeper.bookie.LedgerStorage;
  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.apache.commons.lang3.StringUtils;
  import org.apache.commons.lang3.tuple.Pair;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * HttpEndpointService that handle force trigger GC requests.
   *
   * <p>The PUT method will force trigger GC on current bookie, and make GC run at backend.
   *
   * <p>The GET method will get the force triggered GC running or not.
   * Output would be like:
   *        {
   *           "is_in_force_gc" : "false"
   *        }
   */
  public class TriggerGCService implements HttpEndpointService {
  
      static final Logger LOG = LoggerFactory.getLogger(TriggerGCService.class);
  
      protected ServerConfiguration conf;
      protected BookieServer bookieServer;
  
      public TriggerGCService(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();
          try {
              if (HttpServer.Method.PUT == request.getMethod()) {
                  String requestBody = request.getBody();
                  if (StringUtils.isBlank(requestBody)) {
                      bookieServer.getBookie().getLedgerStorage().forceGC();
                  } else {
                      @SuppressWarnings("unchecked")
                      Map<String, Object> configMap = JsonUtil.fromJson(requestBody, HashMap.class);
                      LedgerStorage ledgerStorage = bookieServer.getBookie().getLedgerStorage();
                      boolean forceMajor = !ledgerStorage.isMajorGcSuspended();
                      boolean forceMinor = !ledgerStorage.isMinorGcSuspended();
  
                      forceMajor = Boolean.parseBoolean(configMap.getOrDefault("forceMajor", forceMajor).toString());
                      forceMinor = Boolean.parseBoolean(configMap.getOrDefault("forceMinor", forceMinor).toString());
                      ledgerStorage.forceGC(forceMajor, forceMinor);
                  }
  
                  String output = "Triggered GC on BookieServer: " + bookieServer.getBookieId();
                  String jsonResponse = JsonUtil.toJson(output);
                  if (LOG.isDebugEnabled()) {
                      LOG.debug("output body:" + jsonResponse);
                  }
                  response.setBody(jsonResponse);
                  response.setCode(HttpServer.StatusCode.OK);
                  return response;
              } else if (HttpServer.Method.GET == request.getMethod()) {
                  Boolean isInForceGC = bookieServer.getBookie().getLedgerStorage().isInForceGC();
                  Pair<String, String> output = Pair.of("is_in_force_gc", isInForceGC.toString());
                  String jsonResponse = JsonUtil.toJson(output);
                  if (LOG.isDebugEnabled()) {
                      LOG.debug("output body:" + jsonResponse);
                  }
                  response.setBody(jsonResponse);
                  response.setCode(HttpServer.StatusCode.OK);
                  return response;
              } else {
                  response.setCode(HttpServer.StatusCode.METHOD_NOT_ALLOWED);
                  response.setBody("Not allowed method. Should be PUT to trigger GC, Or GET to get Force GC state.");
                  return response;
              }
          } catch (Exception e) {
              LOG.error("Failed to handle the request, method: {}, body: {} ", request.getMethod(), request.getBody(), e);
              response.setCode(HttpServer.StatusCode.BAD_REQUEST);
              response.setBody("Failed to handle the request, exception: " + e.getMessage());
              return response;
          }
      }
  }
  