/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.util;
import com.hazelcast.test.HazelcastParallelClassRunner;
import com.hazelcast.test.HazelcastTestSupport;
import com.hazelcast.test.annotation.ParallelTest;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;
/**
* Invokes all {@link JVMUtil} method to ensure no exception is thrown.
*/
@RunWith(HazelcastParallelClassRunner.class)
@Category({QuickTest.class, ParallelTest.class})
public class JVMUtilTest extends HazelcastTestSupport {
@Test
public void testConstructor() {
assertUtilityConstructor(JVMUtil.class);
}
@Test
public void testIs32bitJVM() {
JVMUtil.is32bitJVM();
}
@Test
public void testIsCompressedOops() {
JVMUtil.isCompressedOops();
}
@Test
public void testIsHotSpotCompressedOopsOrNull() {
JVMUtil.isHotSpotCompressedOopsOrNull();
}
@Test
public void testIsObjectLayoutCompressedOopsOrNull() {
JVMUtil.isObjectLayoutCompressedOopsOrNull();
}
// Prints the size of object reference as calculated by JVMUtil.
// When running under Hotspot 64-bit:
// - JDK 6u23+ should report 4 (CompressedOops enabled by default)
// - JDK 7 with -Xmx <= 32G or without any -Xmx specified should report 4 (CompressedOops enabled), otherwise 8
// - explicitly starting with -XX:+UseCompressedOops should report 4, otherwise 8
public static void main(String[] args) {
System.out.println("Size of reference: " + JVMUtil.REFERENCE_COST_IN_BYTES);
}
}