1 /* 2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.lang.management.GarbageCollectorMXBean; 25 import java.lang.management.ManagementFactory; 26 import java.util.Arrays; 27 import java.util.Objects; 28 29 /** 30 * Helper class with enum representation of GC types. 31 */ 32 public final class GCTypes { 33 34 private static <T extends GCType> T getCurrentGCType(Class<T> type) { 35 return ManagementFactory.getGarbageCollectorMXBeans().stream() 36 .map(bean -> getGCTypeByName(type, bean.getName())) 37 .filter(Objects::nonNull) 38 .findFirst() 39 .orElse(null); 40 } 41 42 private static <T extends GCType> T getGCTypeByName(Class<T> type, String name) { 43 return Arrays.stream(type.getEnumConstants()) 44 .filter(e -> e.getGCName().equals(name)) 45 .findFirst() 46 .orElse(null); 47 } 48 49 private static <T extends GCType> GarbageCollectorMXBean getGCBeanByType(Class<T> type) { 50 return ManagementFactory.getGarbageCollectorMXBeans().stream() 51 .filter(bean -> Arrays.stream(type.getEnumConstants()) 52 .filter(enumName -> enumName.getGCName().equals(bean.getName())) 53 .findFirst() 54 .isPresent() 55 ) 56 .findFirst() 57 .orElse(null); 58 } 59 60 /** 61 * Helper interface used by GCTypes static methods 62 * to get gcTypeName field of *GCType classes. 63 */ 64 private interface GCType { 65 66 String getGCName(); 67 } 68 69 public static enum YoungGCType implements GCType { 70 DefNew("Copy"), 71 ParNew("ParNew"), 72 PSNew("PS Scavenge"), 73 G1("G1 Young Generation"); 74 75 @Override 76 public String getGCName() { 77 return gcTypeName; 78 } 79 private final String gcTypeName; 80 81 private YoungGCType(String name) { 82 gcTypeName = name; 83 } 84 85 public static YoungGCType getYoungGCType() { 86 return GCTypes.getCurrentGCType(YoungGCType.class); 87 } 88 89 public static GarbageCollectorMXBean getYoungGCBean() { 90 return GCTypes.getGCBeanByType(YoungGCType.class); 91 } 92 } 93 94 public static enum OldGCType implements GCType { 95 Serial("MarkSweepCompact"), 96 CMS("ConcurrentMarkSweep"), 97 PSOld("PS MarkSweep"), 98 G1("G1 Old Generation"); 99 100 private final String gcTypeName; 101 102 private OldGCType(String name) { 103 gcTypeName = name; 104 } 105 106 public static OldGCType getOldGCType() { 107 return GCTypes.getCurrentGCType(OldGCType.class); 108 } 109 110 @Override 111 public String getGCName() { 112 return gcTypeName; 113 } 114 } 115 } | 1 /* 2 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.lang.management.GarbageCollectorMXBean; 25 import java.lang.management.ManagementFactory; 26 import java.util.Arrays; 27 import java.util.Objects; 28 29 import com.sun.management.HotSpotDiagnosticMXBean; 30 import com.sun.management.VMOption; 31 32 /** 33 * Helper class with enum representation of GC types. 34 */ 35 public final class GCTypes { 36 37 private static <T extends GCType> T getCurrentGCType(Class<T> type) { 38 return ManagementFactory.getGarbageCollectorMXBeans().stream() 39 .map(bean -> getGCTypeByName(type, bean.getName())) 40 .filter(Objects::nonNull) 41 .findFirst() 42 .orElse(null); 43 } 44 45 private static <T extends GCType> T getGCTypeByName(Class<T> type, String name) { 46 return Arrays.stream(type.getEnumConstants()) 47 .filter(e -> e.getGCName().equals(name)) 48 .findFirst() 49 .orElse(null); 50 } 51 52 private static <T extends GCType> GarbageCollectorMXBean getGCBeanByType(Class<T> type) { 53 return ManagementFactory.getGarbageCollectorMXBeans().stream() 54 .filter(bean -> Arrays.stream(type.getEnumConstants()) 55 .filter(enumName -> enumName.getGCName().equals(bean.getName())) 56 .findFirst() 57 .isPresent() 58 ) 59 .findFirst() 60 .orElse(null); 61 } 62 63 public static class LegacyMonitoring { 64 private static final boolean useLegacyMonitoring = getUseLegacyMonitoring(); 65 66 private static boolean getUseLegacyMonitoring() { 67 HotSpotDiagnosticMXBean diagnostic 68 = ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class); 69 VMOption option = diagnostic.getVMOption("G1UseLegacyMonitoring"); 70 return option.getValue().equals("true"); 71 } 72 73 public static boolean use() { return useLegacyMonitoring; } 74 } 75 76 /** 77 * Helper interface used by GCTypes static methods 78 * to get gcTypeName field of *GCType classes. 79 */ 80 private interface GCType { 81 String getGCName(); 82 } 83 84 public static enum YoungGCType implements GCType { 85 DefNew("Copy"), 86 ParNew("ParNew"), 87 PSNew("PS Scavenge"), 88 G1("G1"); 89 90 @Override 91 public String getGCName() { 92 return gcTypeName; 93 } 94 private final String gcTypeName; 95 96 private YoungGCType(String name) { 97 if (name.contains("G1")) { 98 name = LegacyMonitoring.use() ? "G1 Young Generation" : "G1 Young"; 99 } 100 gcTypeName = name; 101 } 102 103 public static YoungGCType getYoungGCType() { 104 return GCTypes.getCurrentGCType(YoungGCType.class); 105 } 106 107 public static GarbageCollectorMXBean getYoungGCBean() { 108 return GCTypes.getGCBeanByType(YoungGCType.class); 109 } 110 } 111 112 public static enum OldGCType implements GCType { 113 Serial("MarkSweepCompact"), 114 CMS("ConcurrentMarkSweep"), 115 PSOld("PS MarkSweep"), 116 G1("G1"); 117 118 private final String gcTypeName; 119 120 private OldGCType(String name) { 121 if (name.contains("G1")) { 122 name = LegacyMonitoring.use() ? "G1 Old Generation" : "G1 Full"; 123 } 124 gcTypeName = name; 125 } 126 127 public static OldGCType getOldGCType() { 128 return GCTypes.getCurrentGCType(OldGCType.class); 129 } 130 131 @Override 132 public String getGCName() { 133 return gcTypeName; 134 } 135 } 136 } |