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* 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.monitor.jvm;
import org.apache.lucene.util.Constants;
import org.elasticsearch.bootstrap.JavaVersion;
import org.elasticsearch.test.ESTestCase;
public class JvmInfoTests extends ESTestCase {
public void testUseG1GC() {
// if we are running on HotSpot, and the test JVM was started
// with UseG1GC, then JvmInfo should successfully report that
// G1GC is enabled
if (Constants.JVM_NAME.contains("HotSpot") || Constants.JVM_NAME.contains("OpenJDK")) {
assertEquals(Boolean.toString(isG1GCEnabled()), JvmInfo.jvmInfo().useG1GC());
} else {
assertEquals("unknown", JvmInfo.jvmInfo().useG1GC());
}
}
private boolean isG1GCEnabled() {
final String argline = System.getProperty("tests.jvm.argline");
final boolean g1GCEnabled = flagIsEnabled(argline, "UseG1GC");
// for JDK 9 the default collector when no collector is specified is G1 GC
final boolean versionIsAtLeastJava9 = JavaVersion.current().compareTo(JavaVersion.parse("9")) >= 0;
final boolean noOtherCollectorSpecified =
argline == null ||
(!flagIsEnabled(argline, "UseParNewGC") &&
!flagIsEnabled(argline, "UseParallelGC") &&
!flagIsEnabled(argline, "UseParallelOldGC") &&
!flagIsEnabled(argline, "UseSerialGC") &&
!flagIsEnabled(argline, "UseConcMarkSweepGC"));
return g1GCEnabled || (versionIsAtLeastJava9 && noOtherCollectorSpecified);
}
private boolean flagIsEnabled(String argline, String flag) {
final boolean containsPositiveFlag = argline != null && argline.contains("-XX:+" + flag);
if (!containsPositiveFlag) return false;
final int index = argline.lastIndexOf(flag);
return argline.charAt(index - 1) == '+';
}
}