| /** |
| * 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. |
| */ |
| |
| package org.apache.hadoop.yarn.server.timelineservice.storage.common; |
| |
| import org.apache.hadoop.hbase.util.Bytes; |
| |
| /** |
| * Encodes and decodes event column names for application and entity tables. |
| * The event column name is of the form : eventId=timestamp=infokey. |
| * If info is not associated with the event, event column name is of the form : |
| * eventId=timestamp= |
| * Event timestamp is long and rest are strings. |
| * Column prefixes are not part of the eventcolumn name passed for encoding. It |
| * is added later, if required in the associated ColumnPrefix implementations. |
| */ |
| public final class EventColumnNameConverter |
| implements KeyConverter<EventColumnName> { |
| |
| public EventColumnNameConverter() { |
| } |
| |
| // eventId=timestamp=infokey are of types String, Long String |
| // Strings are variable in size (i.e. end whenever separator is encountered). |
| // This is used while decoding and helps in determining where to split. |
| private static final int[] SEGMENT_SIZES = { |
| Separator.VARIABLE_SIZE, Bytes.SIZEOF_LONG, Separator.VARIABLE_SIZE }; |
| |
| /* |
| * (non-Javadoc) |
| * |
| * Encodes EventColumnName into a byte array with each component/field in |
| * EventColumnName separated by Separator#VALUES. This leads to an event |
| * column name of the form eventId=timestamp=infokey. |
| * If timestamp in passed EventColumnName object is null (eventId is not null) |
| * this returns a column prefix of the form eventId= and if infokey in |
| * EventColumnName is null (other 2 components are not null), this returns a |
| * column name of the form eventId=timestamp= |
| * |
| * @see |
| * org.apache.hadoop.yarn.server.timelineservice.storage.common.KeyConverter |
| * #encode(java.lang.Object) |
| */ |
| @Override |
| public byte[] encode(EventColumnName key) { |
| byte[] first = Separator.encode(key.getId(), Separator.SPACE, Separator.TAB, |
| Separator.VALUES); |
| if (key.getTimestamp() == null) { |
| return Separator.VALUES.join(first, Separator.EMPTY_BYTES); |
| } |
| byte[] second = Bytes.toBytes( |
| LongConverter.invertLong(key.getTimestamp())); |
| if (key.getInfoKey() == null) { |
| return Separator.VALUES.join(first, second, Separator.EMPTY_BYTES); |
| } |
| return Separator.VALUES.join(first, second, Separator.encode( |
| key.getInfoKey(), Separator.SPACE, Separator.TAB, Separator.VALUES)); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * Decodes an event column name of the form eventId=timestamp= or |
| * eventId=timestamp=infoKey represented in byte format and converts it into |
| * an EventColumnName object. |
| * |
| * @see |
| * org.apache.hadoop.yarn.server.timelineservice.storage.common.KeyConverter |
| * #decode(byte[]) |
| */ |
| @Override |
| public EventColumnName decode(byte[] bytes) { |
| byte[][] components = Separator.VALUES.split(bytes, SEGMENT_SIZES); |
| if (components.length != 3) { |
| throw new IllegalArgumentException("the column name is not valid"); |
| } |
| String id = Separator.decode(Bytes.toString(components[0]), |
| Separator.VALUES, Separator.TAB, Separator.SPACE); |
| Long ts = LongConverter.invertLong(Bytes.toLong(components[1])); |
| String infoKey = components[2].length == 0 ? null : |
| Separator.decode(Bytes.toString(components[2]), |
| Separator.VALUES, Separator.TAB, Separator.SPACE); |
| return new EventColumnName(id, ts, infoKey); |
| } |
| } |