| /** |
| * 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.reader; |
| |
| import org.apache.hadoop.classification.InterfaceAudience.Private; |
| import org.apache.hadoop.classification.InterfaceStability.Unstable; |
| import org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelineCompareOp; |
| import org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelineFilterList; |
| import org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelinePrefixFilter; |
| import org.apache.hadoop.yarn.server.timelineservice.reader.filter.TimelineFilterList.Operator; |
| |
| /** |
| * Used for parsing metrics or configs to retrieve. |
| */ |
| @Private |
| @Unstable |
| public class TimelineParserForDataToRetrieve implements TimelineParser { |
| private String expr; |
| private final int exprLength; |
| public TimelineParserForDataToRetrieve(String expression) { |
| this.expr = expression; |
| if (expression != null) { |
| this.expr = expr.trim(); |
| exprLength = expr.length(); |
| } else { |
| exprLength = 0; |
| } |
| } |
| |
| @Override |
| public TimelineFilterList parse() throws TimelineParseException { |
| if (expr == null || exprLength == 0) { |
| return null; |
| } |
| TimelineCompareOp compareOp = null; |
| int openingBracketIndex = |
| expr.indexOf(TimelineParseConstants.OPENING_BRACKET_CHAR); |
| if (expr.charAt(0) == TimelineParseConstants.NOT_CHAR) { |
| if (openingBracketIndex == -1) { |
| throw new TimelineParseException("Invalid config/metric to retrieve " + |
| "expression"); |
| } |
| if (openingBracketIndex != 1 && |
| expr.substring(1, openingBracketIndex + 1).trim().length() != 1) { |
| throw new TimelineParseException("Invalid config/metric to retrieve " + |
| "expression"); |
| } |
| compareOp = TimelineCompareOp.NOT_EQUAL; |
| } else if (openingBracketIndex <= 0) { |
| compareOp = TimelineCompareOp.EQUAL; |
| } |
| char lastChar = expr.charAt(exprLength - 1); |
| if (compareOp == TimelineCompareOp.NOT_EQUAL && |
| lastChar != TimelineParseConstants.CLOSING_BRACKET_CHAR) { |
| throw new TimelineParseException("Invalid config/metric to retrieve " + |
| "expression"); |
| } |
| if (openingBracketIndex != -1 && |
| expr.charAt(exprLength - 1) == |
| TimelineParseConstants.CLOSING_BRACKET_CHAR) { |
| expr = expr.substring(openingBracketIndex + 1, exprLength - 1).trim(); |
| } |
| if (expr.isEmpty()) { |
| return null; |
| } |
| Operator op = |
| (compareOp == TimelineCompareOp.NOT_EQUAL) ? Operator.AND : Operator.OR; |
| TimelineFilterList list = new TimelineFilterList(op); |
| String[] splits = expr.split(TimelineParseConstants.COMMA_DELIMITER); |
| for (String split : splits) { |
| list.addFilter(new TimelinePrefixFilter(compareOp, split.trim())); |
| } |
| return list; |
| } |
| |
| @Override |
| public void close() { |
| } |
| } |