| package org.apache.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 java.io.InputStream; |
| import java.util.Properties; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * hold helix-manager properties read from |
| * helix-core/src/main/resources/cluster-manager.properties |
| */ |
| public class HelixManagerProperties { |
| private static final Logger LOG = LoggerFactory.getLogger(HelixManagerProperties.class.getName()); |
| |
| private final Properties _properties = new Properties(); |
| |
| /** |
| * Initialize properties from a file |
| * @param propertyFileName |
| */ |
| public HelixManagerProperties(String propertyFileName) { |
| try { |
| InputStream stream = |
| Thread.currentThread().getContextClassLoader().getResourceAsStream(propertyFileName); |
| _properties.load(stream); |
| |
| } catch (Exception e) { |
| String errMsg = "fail to open properties file: " + propertyFileName; |
| throw new IllegalArgumentException(errMsg, e); |
| } |
| |
| LOG.info("load helix-manager properties: " + _properties); |
| } |
| |
| // for test purpose |
| public HelixManagerProperties() { |
| // load empty properties |
| } |
| |
| /** |
| * Get properties wrapped as {@link Properties} |
| * @return Properties |
| */ |
| public Properties getProperties() { |
| return _properties; |
| } |
| |
| /** |
| * get helix version |
| * @return version read from properties |
| */ |
| public String getVersion() { |
| return this.getProperty("clustermanager.version"); |
| } |
| |
| /** |
| * get property for key |
| * @param key |
| * @return property associated by key |
| */ |
| public String getProperty(String key) { |
| String value = _properties.getProperty(key); |
| if (value == null) { |
| LOG.warn("no property for key: " + key); |
| } |
| |
| return value; |
| } |
| |
| /** |
| * return true if version1 >= version2, false otherwise, ignore non-numerical strings |
| * assume version in format of n.n.n-x-x, where n is number and x is any string |
| * e.g. 0.6.0-incubating-SNAPSHOT |
| * @param version1 |
| * @param version2 |
| * @return true if version1 >= version2, false otherwise |
| */ |
| static boolean versionNoLessThan(String version1, String version2) { |
| if (version1 == null || version2 == null) { |
| LOG.warn("fail to compare versions. version1: " + version1 + ", version2: " + version2); |
| return true; |
| } |
| |
| String[] version1Splits = version1.split("(\\.|-)"); |
| String[] version2Splits = version2.split("(\\.|-)"); |
| |
| if (version1Splits == null || version1Splits.length == 0 || version2Splits == null |
| || version2Splits.length == 0) { |
| LOG.warn("fail to compare versions. version1: " + version1 + ", version2: " + version2); |
| } |
| |
| for (int i = 0; i < version1Splits.length && i < version2Splits.length; i++) { |
| try { |
| int versionNum1 = Integer.parseInt(version1Splits[i]); |
| int versionNum2 = Integer.parseInt(version2Splits[i]); |
| |
| if (versionNum1 < versionNum2) { |
| return false; |
| } else if (versionNum1 > versionNum2) { |
| break; |
| } |
| } catch (Exception e) { |
| // ignore non-numerical strings and strings after non-numerical strings |
| break; |
| } |
| } |
| |
| return true; |
| } |
| |
| /** |
| * return true if participantVersion is no less than minimum supported version for participant |
| * false otherwise |
| * @param participantVersion |
| * @return true if compatible, false otherwise |
| */ |
| public boolean isParticipantCompatible(String participantVersion) { |
| return isFeatureSupported("participant", participantVersion); |
| } |
| |
| /** |
| * return true if participantVersion is no less than minimum supported version for the feature |
| * false otherwise |
| * @param featureName |
| * @param participantVersion |
| * @return true if supported, false otherwise |
| */ |
| public boolean isFeatureSupported(String featureName, String participantVersion) { |
| String minSupportedVersion = getProperty("minimum_supported_version." + featureName); |
| |
| return versionNoLessThan(participantVersion, minSupportedVersion); |
| } |
| |
| } |