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 com.google.common.collect.Lists;
  import com.google.common.collect.Maps;
  import java.io.File;
  import java.util.List;
  import java.util.Map;
  import org.apache.bookkeeper.bookie.Journal;
  import org.apache.bookkeeper.bookie.LedgerDirsManager;
  import org.apache.bookkeeper.bookie.LogMark;
  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.util.DiskChecker;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * HttpEndpointService that handle Bookkeeper get last log mark related http request.
   * The GET method will get the last log position of each journal.
   *
   * <p>output would be like this:
   *  {
   *    "&lt;Journal_id&gt;" : "&lt;Pos&gt;",
   *    ...
   *  }
   */
  public class GetLastLogMarkService implements HttpEndpointService {
  
      static final Logger LOG = LoggerFactory.getLogger(GetLastLogMarkService.class);
  
      protected ServerConfiguration conf;
  
      public GetLastLogMarkService(ServerConfiguration conf) {
          checkNotNull(conf);
          this.conf = conf;
      }
  
      @Override
      public HttpServiceResponse handle(HttpServiceRequest request) throws Exception {
          HttpServiceResponse response = new HttpServiceResponse();
  
          if (HttpServer.Method.GET == request.getMethod()) {
              try {
                  /**
                   * output:
                   *  {
                   *    "&lt;Journal_id&gt;" : "&lt;Pos&gt;",
                   *    ...
                   *  }
                   */
                  Map<String, String> output = Maps.newHashMap();
  
                  List<Journal> journals = Lists.newArrayListWithCapacity(conf.getJournalDirs().length);
                  int idx = 0;
                  for (File journalDir : conf.getJournalDirs()) {
                      journals.add(new Journal(idx++, journalDir, conf, new LedgerDirsManager(conf, conf.getLedgerDirs(),
                        new DiskChecker(conf.getDiskUsageThreshold(), conf.getDiskUsageWarnThreshold()))));
                  }
                  for (Journal journal : journals) {
                      LogMark lastLogMark = journal.getLastLogMark().getCurMark();
                      if (LOG.isDebugEnabled()) {
                          LOG.debug("LastLogMark: Journal Id - " + lastLogMark.getLogFileId() + "("
                                  + Long.toHexString(lastLogMark.getLogFileId()) + ".txn), Pos - "
                                  + lastLogMark.getLogFileOffset());
                      }
                      output.put("LastLogMark: Journal Id - " + lastLogMark.getLogFileId()
                          + "(" + Long.toHexString(lastLogMark.getLogFileId()) + ".txn)",
                          "Pos - " + lastLogMark.getLogFileOffset());
                  }
  
                  String jsonResponse = JsonUtil.toJson(output);
                  if (LOG.isDebugEnabled()) {
                      LOG.debug("output body:" + jsonResponse);
                  }
                  response.setBody(jsonResponse);
                  response.setCode(HttpServer.StatusCode.OK);
                  return response;
              } catch (Throwable e) {
                  LOG.error("Exception occurred while getting last log mark", e);
                  response.setCode(HttpServer.StatusCode.NOT_FOUND);
                  response.setBody("ERROR handling request: " + e.getMessage());
                  return response;
              }
          } else {
              response.setCode(HttpServer.StatusCode.NOT_FOUND);
              response.setBody("Not found method. Should be GET method");
              return response;
          }
      }
  }
  