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.PropertyType;
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 CurrentStatesResource extends Resource
{
private final static Logger LOG = Logger.getLogger(CurrentStatesResource.class);
public CurrentStatesResource(Context context, Request request, Response response)
{
super(context, request, response);
getVariants().add(new Variant(MediaType.TEXT_PLAIN));
getVariants().add(new Variant(MediaType.APPLICATION_JSON));
}
public boolean allowGet()
{
return true;
}
public boolean allowPost()
{
return false;
}
public boolean allowPut()
{
return false;
}
public boolean allowDelete()
{
return false;
}
public Representation represent(Variant variant)
{
StringRepresentation presentation = null;
try
{
String clusterName = (String) getRequest().getAttributes().get("clusterName");
String instanceName = (String) getRequest().getAttributes().get("instanceName");
presentation = getInstanceCurrentStatesRepresentation(clusterName, instanceName);
}
catch (Exception e)
{
String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e);
presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON);
LOG.error("", e);
}
return presentation;
}
StringRepresentation getInstanceCurrentStatesRepresentation(String clusterName, String instanceName) throws JsonGenerationException, JsonMappingException, IOException
{
ZkClient zkClient = (ZkClient)getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);;
String instanceSessionId = ClusterRepresentationUtil.getInstanceSessionId(zkClient, clusterName, instanceName);
String message = ClusterRepresentationUtil.getInstancePropertyNameListAsString(zkClient, clusterName, instanceName, PropertyType.CURRENTSTATES, instanceSessionId, MediaType.APPLICATION_JSON);
StringRepresentation representation = new StringRepresentation(message, MediaType.APPLICATION_JSON);
return representation;
}
}