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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2008, 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.management; | ||
| 27 | |||
| 28 | import java.lang.management.ManagementFactory; | ||
| 29 | import java.lang.management.MemoryPoolMXBean; | ||
| 30 | import java.lang.management.MemoryUsage; | ||
| 31 | import java.lang.management.MemoryType; | ||
| 32 | import java.lang.management.MemoryManagerMXBean; | ||
| 33 | import javax.management.openmbean.CompositeData; | ||
| 34 | import javax.management.ObjectName; | ||
| 35 | |||
| 36 | import static java.lang.management.MemoryNotificationInfo.*; | ||
| 37 | |||
| 38 | /** | ||
| 39 | * Implementation class for a memory pool. | ||
| 40 | * Standard and committed hotspot-specific metrics if any. | ||
| 41 | * | ||
| 42 | * ManagementFactory.getMemoryPoolMXBeans() returns a list of | ||
| 43 | * instances of this class. | ||
| 44 | */ | ||
| 45 | class MemoryPoolImpl implements MemoryPoolMXBean { | ||
| 46 | |||
| 47 | private final String name; | ||
| 48 | private final boolean isHeap; | ||
| 49 | private final boolean isValid; | ||
| 50 | private final boolean collectionThresholdSupported; | ||
| 51 | private final boolean usageThresholdSupported; | ||
| 52 | |||
| 53 | private MemoryManagerMXBean[] managers; | ||
| 54 | |||
| 55 | private long usageThreshold; | ||
| 56 | private long collectionThreshold; | ||
| 57 | |||
| 58 | private boolean usageSensorRegistered; | ||
| 59 | private boolean gcSensorRegistered; | ||
| 60 | private Sensor usageSensor; | ||
| 61 | private Sensor gcSensor; | ||
| 62 | |||
| 63 | MemoryPoolImpl(String name, boolean isHeap, long usageThreshold, | ||
| 64 | long gcThreshold) { | ||
| 65 | this.name = name; | ||
| 66 | this.isHeap = isHeap; | ||
| 67 | this.isValid = true; | ||
| 68 | this.managers = null; | ||
| 69 | this.usageThreshold = usageThreshold; | ||
| 70 | this.collectionThreshold = gcThreshold; | ||
| 71 | this.usageThresholdSupported = (usageThreshold >= 0); | ||
| 72 | this.collectionThresholdSupported = (gcThreshold >= 0); | ||
| 73 | this.usageSensor = new PoolSensor(this, name + " usage sensor"); | ||
| 74 | this.gcSensor = new CollectionSensor(this, name + " collection sensor"); | ||
| 75 | this.usageSensorRegistered = false; | ||
| 76 | this.gcSensorRegistered = false; | ||
| 77 | } | ||
| 78 | |||
| 79 | public String getName() { | ||
| 80 | return name; | ||
| 81 | } | ||
| 82 | |||
| 83 | public boolean isValid() { | ||
| 84 | return isValid; | ||
| 85 | } | ||
| 86 | |||
| 87 | public MemoryType getType() { | ||
| 88 | if (isHeap) { | ||
| 89 | return MemoryType.HEAP; | ||
| 90 | } else { | ||
| 91 | return MemoryType.NON_HEAP; | ||
| 92 | } | ||
| 93 | } | ||
| 94 | |||
| 95 | public MemoryUsage getUsage() { | ||
| 96 | return getUsage0(); | ||
| 97 | } | ||
| 98 | |||
| 99 | public synchronized MemoryUsage getPeakUsage() { | ||
| 100 | // synchronized since resetPeakUsage may be resetting the peak usage | ||
| 101 | return getPeakUsage0(); | ||
| 102 | } | ||
| 103 | |||
| 104 | public synchronized long getUsageThreshold() { | ||
| 105 | if (!isUsageThresholdSupported()) { | ||
| 106 | throw new UnsupportedOperationException( | ||
| 107 | "Usage threshold is not supported"); | ||
| 108 | } | ||
| 109 | return usageThreshold; | ||
| 110 | } | ||
| 111 | |||
| 112 | public void setUsageThreshold(long newThreshold) { | ||
| 113 | if (!isUsageThresholdSupported()) { | ||
| 114 | throw new UnsupportedOperationException( | ||
| 115 | "Usage threshold is not supported"); | ||
| 116 | } | ||
| 117 | |||
| 118 | Util.checkControlAccess(); | ||
| 119 | |||
| 120 | MemoryUsage usage = getUsage0(); | ||
| 121 | if (newThreshold < 0) { | ||
| 122 | throw new IllegalArgumentException( | ||
| 123 | "Invalid threshold: " + newThreshold); | ||
| 124 | } | ||
| 125 | |||
| 126 | if (usage.getMax() != -1 && newThreshold > usage.getMax()) { | ||
| 127 | throw new IllegalArgumentException( | ||
| 128 | "Invalid threshold: " + newThreshold + | ||
| 129 | " must be <= maxSize." + | ||
| 130 | " Committed = " + usage.getCommitted() + | ||
| 131 | " Max = " + usage.getMax()); | ||
| 132 | } | ||
| 133 | |||
| 134 | synchronized (this) { | ||
| 135 | if (!usageSensorRegistered) { | ||
| 136 | // pass the sensor to VM to begin monitoring | ||
| 137 | usageSensorRegistered = true; | ||
| 138 | setPoolUsageSensor(usageSensor); | ||
| 139 | } | ||
| 140 | setUsageThreshold0(usageThreshold, newThreshold); | ||
| 141 | this.usageThreshold = newThreshold; | ||
| 142 | } | ||
| 143 | } | ||
| 144 | |||
| 145 | private synchronized MemoryManagerMXBean[] getMemoryManagers() { | ||
| 146 | if (managers == null) { | ||
| 147 | managers = getMemoryManagers0(); | ||
| 148 | } | ||
| 149 | return managers; | ||
| 150 | } | ||
| 151 | |||
| 152 | public String[] getMemoryManagerNames() { | ||
| 153 | MemoryManagerMXBean[] mgrs = getMemoryManagers(); | ||
| 154 | |||
| 155 | String[] names = new String[mgrs.length]; | ||
| 156 | for (int i = 0; i < mgrs.length; i++) { | ||
| 157 | names[i] = mgrs[i].getName(); | ||
| 158 | } | ||
| 159 | return names; | ||
| 160 | } | ||
| 161 | |||
| 162 | public void resetPeakUsage() { | ||
| 163 | Util.checkControlAccess(); | ||
| 164 | |||
| 165 | synchronized (this) { | ||
| 166 | // synchronized since getPeakUsage may be called concurrently | ||
| 167 | resetPeakUsage0(); | ||
| 168 | } | ||
| 169 | } | ||
| 170 | |||
| 171 | public boolean isUsageThresholdExceeded() { | ||
| 172 | if (!isUsageThresholdSupported()) { | ||
| 173 | throw new UnsupportedOperationException( | ||
| 174 | "Usage threshold is not supported"); | ||
| 175 | } | ||
| 176 | |||
| 177 | // return false if usage threshold crossing checking is disabled | ||
| 178 | if (usageThreshold == 0) { | ||
| 179 | return false; | ||
| 180 | } | ||
| 181 | |||
| 182 | MemoryUsage u = getUsage0(); | ||
| 183 | return (u.getUsed() >= usageThreshold || | ||
| 184 | usageSensor.isOn()); | ||
| 185 | } | ||
| 186 | |||
| 187 | public long getUsageThresholdCount() { | ||
| 188 | if (!isUsageThresholdSupported()) { | ||
| 189 | throw new UnsupportedOperationException( | ||
| 190 | "Usage threshold is not supported"); | ||
| 191 | } | ||
| 192 | |||
| 193 | return usageSensor.getCount(); | ||
| 194 | } | ||
| 195 | |||
| 196 | public boolean isUsageThresholdSupported() { | ||
| 197 | return usageThresholdSupported; | ||
| 198 | } | ||
| 199 | |||
| 200 | public synchronized long getCollectionUsageThreshold() { | ||
| 201 | if (!isCollectionUsageThresholdSupported()) { | ||
| 202 | throw new UnsupportedOperationException( | ||
| 203 | "CollectionUsage threshold is not supported"); | ||
| 204 | } | ||
| 205 | |||
| 206 | return collectionThreshold; | ||
| 207 | } | ||
| 208 | |||
| 209 | public void setCollectionUsageThreshold(long newThreshold) { | ||
| 210 | if (!isCollectionUsageThresholdSupported()) { | ||
| 211 | throw new UnsupportedOperationException( | ||
| 212 | "CollectionUsage threshold is not supported"); | ||
| 213 | } | ||
| 214 | |||
| 215 | Util.checkControlAccess(); | ||
| 216 | |||
| 217 | MemoryUsage usage = getUsage0(); | ||
| 218 | if (newThreshold < 0) { | ||
| 219 | throw new IllegalArgumentException( | ||
| 220 | "Invalid threshold: " + newThreshold); | ||
| 221 | } | ||
| 222 | |||
| 223 | if (usage.getMax() != -1 && newThreshold > usage.getMax()) { | ||
| 224 | throw new IllegalArgumentException( | ||
| 225 | "Invalid threshold: " + newThreshold + | ||
| 226 | " > max (" + usage.getMax() + ")."); | ||
| 227 | } | ||
| 228 | |||
| 229 | synchronized (this) { | ||
| 230 | if (!gcSensorRegistered) { | ||
| 231 | // pass the sensor to VM to begin monitoring | ||
| 232 | gcSensorRegistered = true; | ||
| 233 | setPoolCollectionSensor(gcSensor); | ||
| 234 | } | ||
| 235 | setCollectionThreshold0(collectionThreshold, newThreshold); | ||
| 236 | this.collectionThreshold = newThreshold; | ||
| 237 | } | ||
| 238 | } | ||
| 239 | |||
| 240 | public boolean isCollectionUsageThresholdExceeded() { | ||
| 241 | if (!isCollectionUsageThresholdSupported()) { | ||
| 242 | throw new UnsupportedOperationException( | ||
| 243 | "CollectionUsage threshold is not supported"); | ||
| 244 | } | ||
| 245 | |||
| 246 | // return false if usage threshold crossing checking is disabled | ||
| 247 | if (collectionThreshold == 0) { | ||
| 248 | return false; | ||
| 249 | } | ||
| 250 | |||
| 251 | MemoryUsage u = getCollectionUsage0(); | ||
| 252 | return (gcSensor.isOn() || | ||
| 253 | (u != null && u.getUsed() >= collectionThreshold)); | ||
| 254 | } | ||
| 255 | |||
| 256 | public long getCollectionUsageThresholdCount() { | ||
| 257 | if (!isCollectionUsageThresholdSupported()) { | ||
| 258 | throw new UnsupportedOperationException( | ||
| 259 | "CollectionUsage threshold is not supported"); | ||
| 260 | } | ||
| 261 | |||
| 262 | return gcSensor.getCount(); | ||
| 263 | } | ||
| 264 | |||
| 265 | public MemoryUsage getCollectionUsage() { | ||
| 266 | return getCollectionUsage0(); | ||
| 267 | } | ||
| 268 | |||
| 269 | public boolean isCollectionUsageThresholdSupported() { | ||
| 270 | return collectionThresholdSupported; | ||
| 271 | } | ||
| 272 | |||
| 273 | // Native VM support | ||
| 274 | private native MemoryUsage getUsage0(); | ||
| 275 | private native MemoryUsage getPeakUsage0(); | ||
| 276 | private native MemoryUsage getCollectionUsage0(); | ||
| 277 | private native void setUsageThreshold0(long current, long newThreshold); | ||
| 278 | private native void setCollectionThreshold0(long current, long newThreshold); | ||
| 279 | private native void resetPeakUsage0(); | ||
| 280 | private native MemoryManagerMXBean[] getMemoryManagers0(); | ||
| 281 | private native void setPoolUsageSensor(Sensor s); | ||
| 282 | private native void setPoolCollectionSensor(Sensor s); | ||
| 283 | |||
| 284 | // package private | ||
| 285 | |||
| 286 | /** | ||
| 287 | * PoolSensor will be triggered by the VM when the memory | ||
| 288 | * usage of a memory pool is crossing the usage threshold. | ||
| 289 | * The VM will not trigger this sensor in subsequent crossing | ||
| 290 | * unless the memory usage has returned below the threshold. | ||
| 291 | */ | ||
| 292 | class PoolSensor extends Sensor { | ||
| 293 | MemoryPoolImpl pool; | ||
| 294 | |||
| 295 | PoolSensor(MemoryPoolImpl pool, String name) { | ||
| 296 | super(name); | ||
| 297 | this.pool = pool; | ||
| 298 | } | ||
| 299 | void triggerAction(MemoryUsage usage) { | ||
| 300 | // create and send notification | ||
| 301 | MemoryImpl.createNotification(MEMORY_THRESHOLD_EXCEEDED, | ||
| 302 | pool.getName(), | ||
| 303 | usage, | ||
| 304 | getCount()); | ||
| 305 | } | ||
| 306 | void triggerAction() { | ||
| 307 | // Should not reach here | ||
| 308 | throw new AssertionError("Should not reach here"); | ||
| 309 | } | ||
| 310 | void clearAction() { | ||
| 311 | // do nothing | ||
| 312 | } | ||
| 313 | } | ||
| 314 | |||
| 315 | /** | ||
| 316 | * CollectionSensor will be triggered and cleared by the VM | ||
| 317 | * when the memory usage of a memory pool after GC is crossing | ||
| 318 | * the collection threshold. | ||
| 319 | * The VM will trigger this sensor in subsequent crossing | ||
| 320 | * regardless if the memory usage has changed siince the previous GC. | ||
| 321 | */ | ||
| 322 | class CollectionSensor extends Sensor { | ||
| 323 | MemoryPoolImpl pool; | ||
| 324 | CollectionSensor(MemoryPoolImpl pool, String name) { | ||
| 325 | super(name); | ||
| 326 | this.pool = pool; | ||
| 327 | } | ||
| 328 | void triggerAction(MemoryUsage usage) { | ||
| 329 | MemoryImpl.createNotification(MEMORY_COLLECTION_THRESHOLD_EXCEEDED, | ||
| 330 | pool.getName(), | ||
| 331 | usage, | ||
| 332 | gcSensor.getCount()); | ||
| 333 | } | ||
| 334 | void triggerAction() { | ||
| 335 | // Should not reach here | ||
| 336 | throw new AssertionError("Should not reach here"); | ||
| 337 | } | ||
| 338 | void clearAction() { | ||
| 339 | // do nothing | ||
| 340 | } | ||
| 341 | } | ||
| 342 | |||
| 343 | public ObjectName getObjectName() { | ||
| 344 | return Util.newObjectName(ManagementFactory.MEMORY_POOL_MXBEAN_DOMAIN_TYPE, getName()); | ||
| 345 | } | ||
| 346 | |||
| 347 | } | ||