org.elasticsearch.hadoop.util.Constants Maven / Gradle / Ivy
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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.hadoop.util;
import java.lang.reflect.Field;
import java.util.Collections;
// taken from Apache Lucene
public abstract class Constants {
public static final String OS_ARCH = System.getProperty("os.arch");
public static final boolean JRE_IS_MINIMUM_JAVA7;
public static final boolean JRE_IS_MINIMUM_JAVA8;
/** True if running on a 64bit JVM */
public static final boolean JRE_IS_64BIT;
static {
boolean is64Bit = false;
try {
final Class unsafeClass = Class.forName("sun.misc.Unsafe");
final Field unsafeField = unsafeClass.getDeclaredField("theUnsafe");
unsafeField.setAccessible(true);
final Object unsafe = unsafeField.get(null);
final int addressSize = ((Number) unsafeClass.getMethod("addressSize").invoke(unsafe)).intValue();
//System.out.println("Address size: " + addressSize);
is64Bit = addressSize >= 8;
} catch (Exception e) {
final String x = System.getProperty("sun.arch.data.model");
if (x != null) {
is64Bit = x.indexOf("64") != -1;
}
else {
if (OS_ARCH != null && OS_ARCH.indexOf("64") != -1) {
is64Bit = true;
}
else {
is64Bit = false;
}
}
}
JRE_IS_64BIT = is64Bit;
// this method only exists in Java 7:
boolean v7 = true;
try {
Throwable.class.getMethod("getSuppressed");
} catch (NoSuchMethodException nsme) {
v7 = false;
}
JRE_IS_MINIMUM_JAVA7 = v7;
if (JRE_IS_MINIMUM_JAVA7) {
// this method only exists in Java 8:
boolean v8 = true;
try {
Collections.class.getMethod("emptySortedSet");
} catch (NoSuchMethodException nsme) {
v8 = false;
}
JRE_IS_MINIMUM_JAVA8 = v8;
}
else {
JRE_IS_MINIMUM_JAVA8 = false;
}
}
}