com.alibaba.nacos.common.utils.PropertyUtils Maven / Gradle / Ivy
/*
* Copyright 1999-2022 Alibaba Group Holding Ltd.
*
* Licensed 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 com.alibaba.nacos.common.utils;
/**
* A convenient tool to get property or env value.
*
* @author Pixy Yuan on 2022/3/24
*/
public class PropertyUtils {
private PropertyUtils() {
}
private static final String PROCESSORS_ENV_NAME = "NACOS_COMMON_PROCESSORS";
private static final String PROCESSORS_PROP_NAME = "nacos.common.processors";
/**
* Get system env or property value.
*
* If {@link System#getenv()} has no value for {@code envName},
* return {@link System#getProperty(String)}.
*/
public static String getProperty(String propertyName, String envName) {
return System.getenv().getOrDefault(envName, System.getProperty(propertyName));
}
/**
* Get system env or property value.
*
*
If {@link System#getenv()} has no value for {@code envName},
* return {@link System#getProperty(String, String)} or {@code defaultValue}.
*/
public static String getProperty(String propertyName, String envName, String defaultValue) {
return System.getenv().getOrDefault(envName, System.getProperty(propertyName, defaultValue));
}
/**
* Get processors count maybe preset by env or property.
*/
public static int getProcessorsCount() {
int processorsCount = 0;
String processorsCountPreSet = getProperty(PROCESSORS_PROP_NAME, PROCESSORS_ENV_NAME);
if (processorsCountPreSet != null) {
try {
processorsCount = Integer.parseInt(processorsCountPreSet);
} catch (NumberFormatException ignored) {
}
}
if (processorsCount <= 0) {
processorsCount = Runtime.getRuntime().availableProcessors();
}
return processorsCount;
}
}