org.apache.activemq.artemis.utils.Env Maven / Gradle / Ivy
/**
* 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.activemq.artemis.utils;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
/**
* Utility that detects various properties specific to the current runtime
* environment, such as JVM bitness and OS type.
*/
public final class Env {
private static final int OS_PAGE_SIZE;
static {
//most common OS page size value
int osPageSize = 4096;
sun.misc.Unsafe instance;
try {
Field field = sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
field.setAccessible(true);
instance = (sun.misc.Unsafe) field.get((Object) null);
} catch (Throwable t) {
try {
Constructor c = sun.misc.Unsafe.class.getDeclaredConstructor(new Class[0]);
c.setAccessible(true);
instance = c.newInstance(new Object[0]);
} catch (Throwable t1) {
instance = null;
}
}
if (instance != null) {
osPageSize = instance.pageSize();
}
OS_PAGE_SIZE = osPageSize;
}
/**
* The system will change a few logs and semantics to be suitable to
* run a long testsuite.
* Like a few log entries that are only valid during a production system.
* or a few cases we need to know as warn on the testsuite and as log in production.
*/
private static boolean testEnv = false;
private static final String OS = System.getProperty("os.name").toLowerCase();
private static final boolean IS_LINUX = OS.startsWith("linux");
private static final boolean IS_MAC = OS.startsWith("mac");
private Env() {
}
/**
* Return the size in bytes of a OS memory page.
* This value will always be a power of two.
*/
public static int osPageSize() {
return OS_PAGE_SIZE;
}
public static boolean isTestEnv() {
return testEnv;
}
public static void setTestEnv(boolean testEnv) {
Env.testEnv = testEnv;
}
public static boolean isLinuxOs() {
return IS_LINUX == true;
}
public static boolean isMacOs() {
return IS_MAC == true;
}
}