| package org.apache.helix.zookeeper.datamodel; |
| |
| /* |
| * 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.util.HashMap; |
| import java.util.Map; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * Operations to divide a ZNRecord into specified buckets |
| */ |
| public class ZNRecordBucketizer { |
| private static Logger LOG = LoggerFactory.getLogger(ZNRecordBucketizer.class); |
| final int _bucketSize; |
| |
| /** |
| * Instantiate a bucketizer with the number of buckets |
| * @param bucketSize |
| */ |
| public ZNRecordBucketizer(int bucketSize) { |
| if (bucketSize <= 0) { |
| LOG.debug("bucketSize <= 0 (was " + bucketSize |
| + "). Set to 0 to use non-bucketized HelixProperty."); |
| bucketSize = 0; |
| } |
| |
| _bucketSize = bucketSize; |
| } |
| |
| /** |
| * Calculate bucketName in form of "resourceName_p{startPartition}-p{endPartition} |
| * @param partitionName |
| * @return the bucket name |
| */ |
| public String getBucketName(String key) { |
| if (_bucketSize == 0) { |
| // no bucketize |
| return null; |
| } |
| |
| int idx = key.lastIndexOf('_'); |
| if (idx < 0) { |
| throw new IllegalArgumentException("Could NOT find partition# in " + key |
| + ". partitionName should be in format of resourceName_partition#"); |
| } |
| |
| try { |
| int partitionNb = Integer.parseInt(key.substring(idx + 1)); |
| int bucketNb = partitionNb / _bucketSize; |
| int startPartition = bucketNb * _bucketSize; |
| int endPartition = bucketNb * _bucketSize + (_bucketSize - 1); |
| return key.substring(0, idx) + "_p" + startPartition + "-p" + endPartition; |
| } catch (NumberFormatException e) { |
| throw new IllegalArgumentException("Could NOT parse partition# (" + key.substring(idx + 1) |
| + ") in " + key); |
| } |
| } |
| |
| /** |
| * Bucketize a ZNRecord |
| * @param record |
| * @return A map of bucket names to bucketized records |
| */ |
| public Map<String, ZNRecord> bucketize(ZNRecord record) { |
| Map<String, ZNRecord> map = new HashMap<String, ZNRecord>(); |
| if (_bucketSize == 0) { |
| map.put(record.getId(), record); |
| return map; |
| } |
| |
| // bucketize list field |
| for (String partitionName : record.getListFields().keySet()) { |
| String bucketName = getBucketName(partitionName); |
| if (bucketName != null) { |
| if (!map.containsKey(bucketName)) { |
| map.put(bucketName, new ZNRecord(bucketName)); |
| } |
| ZNRecord bucketizedRecord = map.get(bucketName); |
| bucketizedRecord.setListField(partitionName, record.getListField(partitionName)); |
| } else { |
| LOG.error("Can't bucketize " + partitionName + " in list field"); |
| } |
| } |
| |
| // bucketize map field |
| for (String partitionName : record.getMapFields().keySet()) { |
| String bucketName = getBucketName(partitionName); |
| if (bucketName != null) { |
| if (!map.containsKey(bucketName)) { |
| map.put(bucketName, new ZNRecord(bucketName)); |
| } |
| ZNRecord bucketizedRecord = map.get(bucketName); |
| bucketizedRecord.setMapField(partitionName, record.getMapField(partitionName)); |
| } else { |
| LOG.error("Can't bucketize " + partitionName + " in map field"); |
| } |
| } |
| |
| // copy all simple fields |
| for (ZNRecord bucketizedRecord : map.values()) { |
| bucketizedRecord.setSimpleFields(record.getSimpleFields()); |
| } |
| return map; |
| } |
| } |