| 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.zookeeper.datamodel.ZNRecord; |
| import org.apache.helix.zookeeper.impl.client.ZkClient; |
| import org.apache.helix.model.StateModelDefinition; |
| import org.apache.helix.tools.ClusterSetup; |
| import org.apache.helix.webapp.RestAdminApplication; |
| import org.codehaus.jackson.JsonGenerationException; |
| import org.codehaus.jackson.map.JsonMappingException; |
| import org.restlet.data.MediaType; |
| import org.restlet.data.Status; |
| import org.restlet.representation.Representation; |
| import org.restlet.representation.StringRepresentation; |
| import org.restlet.representation.Variant; |
| import org.restlet.resource.ServerResource; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class StateModelsResource extends ServerResource { |
| private final static Logger LOG = LoggerFactory.getLogger(StateModelsResource.class); |
| |
| public StateModelsResource() { |
| getVariants().add(new Variant(MediaType.TEXT_PLAIN)); |
| getVariants().add(new Variant(MediaType.APPLICATION_JSON)); |
| setNegotiated(false); |
| } |
| |
| @Override |
| public Representation get() { |
| 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 Representation post(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); |
| } |
| return null; |
| } |
| } |