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 javax.servlet.ServletContext;
022import org.apache.hadoop.hbase.rest.model.VersionModel;
023import org.apache.yetus.audience.InterfaceAudience;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026
027import org.apache.hbase.thirdparty.javax.ws.rs.GET;
028import org.apache.hbase.thirdparty.javax.ws.rs.Path;
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/**
037 * Implements REST software version reporting
038 * <p>
039 * <tt>/version/rest</tt>
040 * <p>
041 * <tt>/version</tt> (alias for <tt>/version/rest</tt>)
042 */
043@InterfaceAudience.Private
044public class VersionResource extends ResourceBase {
045
046  private static final Logger LOG = LoggerFactory.getLogger(VersionResource.class);
047
048  static CacheControl cacheControl;
049  static {
050    cacheControl = new CacheControl();
051    cacheControl.setNoCache(true);
052    cacheControl.setNoTransform(false);
053  }
054
055  /**
056   * Constructor n
057   */
058  public VersionResource() throws IOException {
059    super();
060  }
061
062  /**
063   * Build a response for a version request.
064   * @param context servlet context
065   * @param uriInfo (JAX-RS context variable) request URL
066   * @return a response for a version request
067   */
068  @GET
069  @Produces({ MIMETYPE_TEXT, MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF,
070    MIMETYPE_PROTOBUF_IETF })
071  public Response get(final @Context ServletContext context, final @Context UriInfo uriInfo) {
072    if (LOG.isTraceEnabled()) {
073      LOG.trace("GET " + uriInfo.getAbsolutePath());
074    }
075    servlet.getMetrics().incrementRequests(1);
076    ResponseBuilder response = Response.ok(new VersionModel(context));
077    response.cacheControl(cacheControl);
078    servlet.getMetrics().incrementSucessfulGetRequests(1);
079    return response.build();
080  }
081
082  /**
083   * Dispatch to StorageClusterVersionResource
084   */
085  @Path("cluster")
086  public StorageClusterVersionResource getClusterVersionResource() throws IOException {
087    return new StorageClusterVersionResource();
088  }
089
090  /**
091   * Dispatch <tt>/version/rest</tt> to self.
092   */
093  @Path("rest")
094  public VersionResource getVersionResource() {
095    return this;
096  }
097}