Package org.apache.helix.webapp.resources

Source Code of org.apache.helix.webapp.resources.ExternalViewResource

package org.apache.helix.webapp.resources;

/*
* 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.
*/

import java.io.IOException;

import org.apache.helix.PropertyKey;
import org.apache.helix.PropertyKey.Builder;
import org.apache.helix.manager.zk.ZkClient;
import org.apache.helix.webapp.RestAdminApplication;
import org.apache.log4j.Logger;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.restlet.Context;
import org.restlet.data.MediaType;
import org.restlet.data.Request;
import org.restlet.data.Response;
import org.restlet.resource.Representation;
import org.restlet.resource.Resource;
import org.restlet.resource.StringRepresentation;
import org.restlet.resource.Variant;


public class ExternalViewResource extends Resource
{
  private final static Logger LOG = Logger.getLogger(ExternalViewResource.class);

  public ExternalViewResource(Context context, Request request, Response response)
  {
    super(context, request, response);
    getVariants().add(new Variant(MediaType.TEXT_PLAIN));
    getVariants().add(new Variant(MediaType.APPLICATION_JSON));
  }

  @Override
  public boolean allowGet()
  {
    return true;
  }

  @Override
  public boolean allowPost()
  {
    return false;
  }

  @Override
  public boolean allowPut()
  {
    return false;
  }

  @Override
  public boolean allowDelete()
  {
    return false;
  }

  @Override
  public Representation represent(Variant variant)
  {
    StringRepresentation presentation = null;
    try
    {
      String clusterName = (String) getRequest().getAttributes().get("clusterName");
      String resourceName = (String) getRequest().getAttributes().get("resourceName");
      presentation = getExternalViewRepresentation( clusterName, resourceName);
    }

    catch (Exception e)
    {
      String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e);
      presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON);

      LOG.error("", e);
    }
    return presentation;
  }

  StringRepresentation getExternalViewRepresentation(String clusterName,
                                                     String resourceName) throws JsonGenerationException,
      JsonMappingException,
      IOException
  {
    Builder keyBuilder = new PropertyKey.Builder(clusterName);
    ZkClient zkClient = (ZkClient)getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);;
   
    String message =
        ClusterRepresentationUtil.getClusterPropertyAsString(zkClient,
                                                             clusterName,
                                                             keyBuilder.externalView(resourceName),
                                                             MediaType.APPLICATION_JSON);
    StringRepresentation representation =
        new StringRepresentation(message, MediaType.APPLICATION_JSON);

    return representation;
  }
}
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