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 java.util.List;
import org.apache.helix.HelixDataAccessor;
import org.apache.helix.HelixException;
import org.apache.helix.ZNRecord;
import org.apache.helix.manager.zk.ZkClient;
import org.apache.helix.model.StateModelDefinition;
import org.apache.helix.tools.ClusterSetup;
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.data.Status;
import org.restlet.resource.Representation;
import org.restlet.resource.Resource;
import org.restlet.resource.StringRepresentation;
import org.restlet.resource.Variant;
public class StateModelsResource extends Resource
{
private final static Logger LOG = Logger.getLogger(StateModelsResource.class);
public StateModelsResource(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 true;
}
@Override
public boolean allowPut()
{
return false;
}
@Override
public boolean allowDelete()
{
return false;
}
@Override
public Representation represent(Variant variant)
{
StringRepresentation presentation = null;
try
{
presentation = getStateModelsRepresentation();
}
catch(Exception e)
{
String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e);
presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON);
LOG.error("", e);
}
return presentation;
}
StringRepresentation getStateModelsRepresentation() throws JsonGenerationException, JsonMappingException, IOException
{
String clusterName = (String)getRequest().getAttributes().get("clusterName");
ZkClient zkClient = (ZkClient)getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
ClusterSetup setupTool = new ClusterSetup(zkClient);
List<String> models = setupTool.getClusterManagementTool().getStateModelDefs(clusterName);
ZNRecord modelDefinitions = new ZNRecord("modelDefinitions");
modelDefinitions.setListField("models", models);
StringRepresentation representation = new StringRepresentation(ClusterRepresentationUtil.ZNRecordToJson(modelDefinitions), MediaType.APPLICATION_JSON);
return representation;
}
@Override
public void acceptRepresentation(Representation entity)
{
try
{
String clusterName = (String)getRequest().getAttributes().get("clusterName");
ZkClient zkClient = (ZkClient)getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);;
JsonParameters jsonParameters = new JsonParameters(entity);
String command = jsonParameters.getCommand();
if(command.equalsIgnoreCase(ClusterSetup.addStateModelDef))
{
ZNRecord newStateModel = jsonParameters.getExtraParameter(JsonParameters.NEW_STATE_MODEL_DEF);
HelixDataAccessor accessor = ClusterRepresentationUtil.getClusterDataAccessor(zkClient, clusterName);
accessor.setProperty(accessor.keyBuilder().stateModelDef(newStateModel.getId()), new StateModelDefinition(newStateModel) );
getResponse().setEntity(getStateModelsRepresentation());
}
else
{
throw new HelixException("Unsupported command: " + command
+ ". Should be one of [" + ClusterSetup.addStateModelDef + "]");
}
getResponse().setStatus(Status.SUCCESS_OK);
}
catch(Exception e)
{
getResponse().setEntity(ClusterRepresentationUtil.getErrorAsJsonStringFromException(e),
MediaType.APPLICATION_JSON);
getResponse().setStatus(Status.SUCCESS_OK);
LOG.error("Error in posting " + entity, e);
}
}
}