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.HelixException;
import org.apache.helix.ZNRecord;
import org.apache.helix.manager.zk.ZkClient;
import org.apache.helix.model.IdealState.RebalanceMode;
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.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;
public class ResourceGroupsResource extends ServerResource {
private final static Logger LOG = Logger.getLogger(ResourceGroupsResource.class);
public ResourceGroupsResource() {
getVariants().add(new Variant(MediaType.TEXT_PLAIN));
getVariants().add(new Variant(MediaType.APPLICATION_JSON));
setNegotiated(false);
}
@Override
public Representation get() {
StringRepresentation presentation = null;
try {
String clusterName = (String) getRequest().getAttributes().get("clusterName");
presentation = getHostedEntitiesRepresentation(clusterName);
}
catch (Exception e) {
String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e);
presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON);
LOG.error("", e);
}
return presentation;
}
StringRepresentation getHostedEntitiesRepresentation(String clusterName)
throws JsonGenerationException, JsonMappingException, IOException {
ZkClient zkClient = (ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
;
ClusterSetup setupTool = new ClusterSetup(zkClient);
List<String> hostedEntities =
setupTool.getClusterManagementTool().getResourcesInCluster(clusterName);
ZNRecord hostedEntitiesRecord = new ZNRecord("ResourceGroups");
hostedEntitiesRecord.setListField("ResourceGroups", hostedEntities);
StringRepresentation representation =
new StringRepresentation(ClusterRepresentationUtil.ZNRecordToJson(hostedEntitiesRecord),
MediaType.APPLICATION_JSON);
return representation;
}
@Override
public Representation post(Representation entity) {
try {
String clusterName = (String) getRequest().getAttributes().get("clusterName");
JsonParameters jsonParameters = new JsonParameters(entity);
String command = jsonParameters.getCommand();
if (command.equalsIgnoreCase(ClusterSetup.addResource)
|| JsonParameters.CLUSTERSETUP_COMMAND_ALIASES.get(ClusterSetup.addResource).contains(
command)) {
jsonParameters.verifyCommand(ClusterSetup.addResource);
String entityName = jsonParameters.getParameter(JsonParameters.RESOURCE_GROUP_NAME);
String stateModelDefRef = jsonParameters.getParameter(JsonParameters.STATE_MODEL_DEF_REF);
int partitions = Integer.parseInt(jsonParameters.getParameter(JsonParameters.PARTITIONS));
String mode = RebalanceMode.SEMI_AUTO.toString();
if (jsonParameters.getParameter(JsonParameters.IDEAL_STATE_MODE) != null) {
mode = jsonParameters.getParameter(JsonParameters.IDEAL_STATE_MODE);
}
int bucketSize = 0;
if (jsonParameters.getParameter(JsonParameters.BUCKET_SIZE) != null) {
try {
bucketSize = Integer.parseInt(jsonParameters.getParameter(JsonParameters.BUCKET_SIZE));
} catch (Exception e) {
}
}
int maxPartitionsPerNode = -1;
if (jsonParameters.getParameter(JsonParameters.MAX_PARTITIONS_PER_NODE) != null) {
try {
maxPartitionsPerNode =
Integer.parseInt(jsonParameters
.getParameter(JsonParameters.MAX_PARTITIONS_PER_NODE));
} catch (Exception e) {
}
}
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
;
ClusterSetup setupTool = new ClusterSetup(zkClient);
setupTool.addResourceToCluster(clusterName, entityName, partitions, stateModelDefRef, mode,
bucketSize, maxPartitionsPerNode);
} else {
throw new HelixException("Unsupported command: " + command + ". Should be one of ["
+ ClusterSetup.addResource + "]");
}
getResponse().setEntity(getHostedEntitiesRepresentation(clusterName));
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;
}
}