71 lines
2.5 KiB
Java
71 lines
2.5 KiB
Java
/*
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* Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc.concurrent_phase_control;
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/*
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* Utility class that provides verification of expected behavior of
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* the Concurrent GC Phase Control WB API when the current GC does not
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* support phase control. The invoking test must provide WhiteBox access.
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*/
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import sun.hotspot.WhiteBox;
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public class CheckUnsupported {
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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public static void check(String gcName) throws Exception {
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// Verify unsupported.
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if (WB.supportsConcurrentGCPhaseControl()) {
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throw new RuntimeException(
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gcName + " unexpectedly supports phase control");
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}
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// Verify phase sequence is empty.
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String[] phases = WB.getConcurrentGCPhases();
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if (phases.length > 0) {
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throw new RuntimeException(
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gcName + " unexpectedly has non-empty phases");
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}
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// Verify IllegalStateException thrown by request attempt.
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boolean illegalStateThrown = false;
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try {
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WB.requestConcurrentGCPhase("UNKNOWN PHASE");
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} catch (IllegalStateException e) {
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// Expected.
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illegalStateThrown = true;
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} catch (Exception e) {
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throw new RuntimeException(
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gcName + ": Unexpected exception when requesting phase: "
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+ e.toString());
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}
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if (!illegalStateThrown) {
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throw new RuntimeException(
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gcName + ": No exception when requesting phase");
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}
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}
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}
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