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.Maps;
  import java.util.Map;
  import org.apache.bookkeeper.client.api.LedgerMetadata;
  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.meta.LedgerManager;
  import org.apache.bookkeeper.meta.LedgerManagerFactory;
  import org.apache.bookkeeper.meta.LedgerMetadataSerDe;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * HttpEndpointService that handle Bookkeeper get ledger metadata related http request.
   * The GET method will get the ledger metadata for given "ledger_id".
   */
  public class GetLedgerMetaService implements HttpEndpointService {
  
      static final Logger LOG = LoggerFactory.getLogger(GetLedgerMetaService.class);
  
      protected ServerConfiguration conf;
      private final LedgerManagerFactory ledgerManagerFactory;
      private final LedgerMetadataSerDe serDe;
  
      public GetLedgerMetaService(ServerConfiguration conf, LedgerManagerFactory ledgerManagerFactory) {
          checkNotNull(conf);
          this.conf = conf;
          this.ledgerManagerFactory = ledgerManagerFactory;
          this.serDe = new LedgerMetadataSerDe();
      }
  
      @Override
      public HttpServiceResponse handle(HttpServiceRequest request) throws Exception {
          HttpServiceResponse response = new HttpServiceResponse();
          Map<String, String> params = request.getParams();
  
          if (HttpServer.Method.GET == request.getMethod() && (params != null) && params.containsKey("ledger_id")) {
              Long ledgerId = Long.parseLong(params.get("ledger_id"));
  
              LedgerManager manager = ledgerManagerFactory.newLedgerManager();
  
              // output <ledgerId: ledgerMetadata>
              Map<String, Object> output = Maps.newHashMap();
              LedgerMetadata md = manager.readLedgerMetadata(ledgerId).get().getValue();
              output.put(ledgerId.toString(), md);
  
              manager.close();
  
              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.NOT_FOUND);
              response.setBody("Not found method. Should be GET method");
              return response;
          }
      }
  }
  