i3wangyi commented on a change in pull request #516: Implement the propertyStore read endpoint URL: https://github.com/apache/helix/pull/516#discussion_r346019069
########## File path: helix-rest/src/main/java/org/apache/helix/rest/server/resources/helix/PropertyStoreAccessor.java ########## @@ -0,0 +1,102 @@ +package org.apache.helix.rest.server.resources.helix; + +/* + * 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 javax.ws.rs.GET; +import javax.ws.rs.Path; +import javax.ws.rs.PathParam; +import javax.ws.rs.WebApplicationException; +import javax.ws.rs.core.Response; + +import org.I0Itec.zkclient.exception.ZkMarshallingError; +import org.I0Itec.zkclient.serialize.ZkSerializer; +import org.apache.helix.AccessOption; +import org.apache.helix.PropertyPathBuilder; +import org.apache.helix.ZNRecord; +import org.apache.helix.manager.zk.ZkBaseDataAccessor; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +@Path("/clusters/{clusterId}/propertyStore") +public class PropertyStoreAccessor extends AbstractHelixResource { + private static Logger LOG = LoggerFactory.getLogger(PropertyStoreAccessor.class); + + /** + * Sample HTTP URLs: + * http://<HOST>/clusters/{clusterId}/propertyStore/<PATH> + * It refers to the /PROPERTYSTORE/<PATH> in Helix metadata store + * @param clusterId The cluster Id + * @param path path parameter is like "abc/abc/abc" in the URL + * @return JSON object as the response + */ + @GET + @Path("{path: .+}") + public Response getPropertyByPath(@PathParam("clusterId") String clusterId, + @PathParam("path") String path) { + path = "/" + path; + if (!isPathValid(path )) { + LOG.error("The propertyStore path {} is invalid for cluster {}", path, clusterId); + throw new WebApplicationException(Response.status(Response.Status.BAD_REQUEST).entity( + "Invalid path string. Valid path strings use slash as the directory separator and names the location of ZNode") + .build()); + } + final String recordPath = PropertyPathBuilder.propertyStore(clusterId) + path; + ZkSerializer propertyStoreDataSerializer = new ZkSerializer() { + @Override + public byte[] serialize(Object content) + throws ZkMarshallingError { + // No need, it's used only for write-api + return new byte[0]; + } + + @Override + public Object deserialize(byte[] bytes) + throws ZkMarshallingError { + try { + return ZNRecord.class.cast(bytes); + } catch (ClassCastException e) { + LOG.warn("The content of node at path {} is not ZNRecord format", recordPath); + } + // fallback to a default and simple ZNRecord + ZNRecord znRecord = new ZNRecord(recordPath); + znRecord.setSimpleField(recordPath, new String(bytes)); + return znRecord; + } + }; + ZkBaseDataAccessor<ZNRecord> propertyStoreDataAccessor = getZkBaseDataAccessor(propertyStoreDataSerializer); Review comment: answered in the other comment. The duplicated connections can be saved if the hashcode of ZkSerializers is the same. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@helix.apache.org For additional commands, e-mail: reviews-h...@helix.apache.org
