hbase-rest/src/main/java/org/apache/hadoop/hbase/rest/NamespacesResource.java

   1 /*
   2  *
   3  * Licensed to the Apache Software Foundation (ASF) under one
   4  * or more contributor license agreements.  See the NOTICE file
   5  * distributed with this work for additional information
   6  * regarding copyright ownership.  The ASF licenses this file
   7  * to you under the Apache License, Version 2.0 (the
   8  * "License"); you may not use this file except in compliance
   9  * with the License.  You may obtain a copy of the License at
  10  *
  11  *     http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  */
  19
  20 package org.apache.hadoop.hbase.rest;
  21
  22 import java.io.IOException;
  23
  24 import javax.servlet.ServletContext;
  25 import javax.ws.rs.GET;
  26 import javax.ws.rs.Path;
  27 import javax.ws.rs.PathParam;
  28 import javax.ws.rs.Produces;
  29 import javax.ws.rs.core.Context;
  30 import javax.ws.rs.core.Response;
  31 import javax.ws.rs.core.UriInfo;
  32
  33 import org.apache.yetus.audience.InterfaceAudience;
  34 import org.slf4j.Logger;
  35 import org.slf4j.LoggerFactory;
  36 import org.apache.hadoop.hbase.rest.model.NamespacesModel;
  37
  38 /**
  39  * Implements REST GET list of all namespaces.
  40  * <p>
  41  * <tt>/namespaces</tt>
  42  * <p>
  43  */
  44 @InterfaceAudience.Private
  45 public class NamespacesResource extends ResourceBase {
  46
  47   private static final Logger LOG = LoggerFactory.getLogger(NamespacesResource.class);
  48
  49   /**
  50    * Constructor
  51    * @throws IOException
  52    */
  53   public NamespacesResource() throws IOException {
  54     super();
  55   }
  56
  57   /**
  58    * Build a response for a list of all namespaces request.
  59    * @param context servlet context
  60    * @param uriInfo (JAX-RS context variable) request URL
  61    * @return a response for a version request
  62    */
  63   @GET
  64   @Produces({MIMETYPE_TEXT, MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF,
  65     MIMETYPE_PROTOBUF_IETF})
  66   public Response get(final @Context ServletContext context, final @Context UriInfo uriInfo) {
  67     if (LOG.isTraceEnabled()) {
  68       LOG.trace("GET " + uriInfo.getAbsolutePath());
  69     }
  70     servlet.getMetrics().incrementRequests(1);
  71     try {
  72       NamespacesModel rowModel = null;
  73       rowModel = new NamespacesModel(servlet.getAdmin());
  74       servlet.getMetrics().incrementSucessfulGetRequests(1);
  75       return Response.ok(rowModel).build();
  76     } catch (IOException e) {
  77       servlet.getMetrics().incrementFailedGetRequests(1);
  78       throw new RuntimeException("Cannot retrieve list of namespaces.");
  79     }
  80   }
  81
  82   /**
  83    * Dispatch to NamespaceInstanceResource
  84    */
  85   @Path("{namespace}")
  86   public NamespacesInstanceResource getNamespaceInstanceResource(
  87       final @PathParam("namespace") String namespace) throws IOException {
  88     return new NamespacesInstanceResource(namespace);
  89   }
  90 }