001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.rest;
019
020import java.io.IOException;
021import java.util.EnumSet;
022import org.apache.hadoop.hbase.ClusterMetrics.Option;
023import org.apache.hadoop.hbase.rest.model.StorageClusterVersionModel;
024import org.apache.yetus.audience.InterfaceAudience;
025import org.slf4j.Logger;
026import org.slf4j.LoggerFactory;
027
028import org.apache.hbase.thirdparty.javax.ws.rs.GET;
029import org.apache.hbase.thirdparty.javax.ws.rs.Produces;
030import org.apache.hbase.thirdparty.javax.ws.rs.core.CacheControl;
031import org.apache.hbase.thirdparty.javax.ws.rs.core.Context;
032import org.apache.hbase.thirdparty.javax.ws.rs.core.Response;
033import org.apache.hbase.thirdparty.javax.ws.rs.core.Response.ResponseBuilder;
034import org.apache.hbase.thirdparty.javax.ws.rs.core.UriInfo;
035
036@InterfaceAudience.Private
037public class StorageClusterVersionResource extends ResourceBase {
038  private static final Logger LOG = LoggerFactory.getLogger(StorageClusterVersionResource.class);
039
040  static CacheControl cacheControl;
041  static {
042    cacheControl = new CacheControl();
043    cacheControl.setNoCache(true);
044    cacheControl.setNoTransform(false);
045  }
046
047  /**
048   * Constructor
049   */
050  public StorageClusterVersionResource() throws IOException {
051    super();
052  }
053
054  @GET
055  @Produces({ MIMETYPE_TEXT, MIMETYPE_XML, MIMETYPE_JSON })
056  public Response get(final @Context UriInfo uriInfo) {
057    if (LOG.isTraceEnabled()) {
058      LOG.trace("GET " + uriInfo.getAbsolutePath());
059    }
060    servlet.getMetrics().incrementRequests(1);
061    try {
062      StorageClusterVersionModel model = new StorageClusterVersionModel();
063      model.setVersion(
064        servlet.getAdmin().getClusterMetrics(EnumSet.of(Option.HBASE_VERSION)).getHBaseVersion());
065      ResponseBuilder response = Response.ok(model);
066      response.cacheControl(cacheControl);
067      servlet.getMetrics().incrementSucessfulGetRequests(1);
068      return response.build();
069    } catch (IOException e) {
070      servlet.getMetrics().incrementFailedGetRequests(1);
071      return Response.status(Response.Status.SERVICE_UNAVAILABLE).type(MIMETYPE_TEXT)
072        .entity("Unavailable" + CRLF).build();
073    }
074  }
075}