| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more contributor license |
| * agreements. See the NOTICE file distributed with this work for additional information regarding |
| * copyright ownership. The ASF 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.apache.geode.internal.offheap; |
| |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.geode.annotations.internal.MakeNotStatic; |
| import org.apache.geode.util.internal.GeodeGlossary; |
| |
| /** |
| * This class provides static methods to help debug off-heap reference count problems. To enable |
| * reference count tracking set: -Dgemfire.trackOffHeapRefCounts=true. To enable free operation |
| * tracking set: -Dgemfire.trackOffHeapFreedRefCounts=true. |
| */ |
| public class ReferenceCountHelper { |
| |
| public static final String TRACK_OFFHEAP_REFERENCES = |
| GeodeGlossary.GEMFIRE_PREFIX + "trackOffHeapRefCounts"; |
| public static final String TRACK_OFFHEAP_FREES = |
| GeodeGlossary.GEMFIRE_PREFIX + "trackOffHeapFreedRefCounts"; |
| |
| @MakeNotStatic |
| private static final ReferenceCountHelperImpl inst = new ReferenceCountHelperImpl( |
| Boolean.getBoolean(TRACK_OFFHEAP_REFERENCES), Boolean.getBoolean(TRACK_OFFHEAP_FREES)); |
| |
| /* Do not allow any instances */ |
| private ReferenceCountHelper() {} |
| |
| static ReferenceCountHelperImpl getInstance() { |
| return inst; |
| } |
| |
| /** |
| * Returns true if reference count tracking is enabled. |
| */ |
| public static boolean trackReferenceCounts() { |
| return getInstance().trackReferenceCounts(); |
| } |
| |
| /** |
| * Returns true if free operation tracking is enabled. |
| */ |
| public static boolean trackFreedReferenceCounts() { |
| return getInstance().trackFreedReferenceCounts(); |
| } |
| |
| /** |
| * Optional call to tell the tracker the logical "owner" of the reference count. For example you |
| * could set the particular EntryEventImpl instance that incremented the reference count and is |
| * responsible for decrementing it. Calling this method is a noop if !trackReferenceCounts. |
| */ |
| public static void setReferenceCountOwner(Object owner) { |
| getInstance().setReferenceCountOwner(owner); |
| } |
| |
| /** |
| * Create, set, and return a generic reference count owner object. Calling this method is a noop |
| * and returns null if !trackReferenceCounts. |
| */ |
| public static Object createReferenceCountOwner() { |
| return getInstance().createReferenceCountOwner(); |
| } |
| |
| /** |
| * Call this method before incrementing a reference count if you know that tracking is not needed |
| * because you know that the allocate and free will always be done in the same code block. Callers |
| * of this method must also call unskipRefCountTracking after the allocation or free is done. |
| */ |
| public static void skipRefCountTracking() { |
| getInstance().skipRefCountTracking(); |
| } |
| |
| /** |
| * Returns true if currently tracking reference counts. |
| */ |
| public static boolean isRefCountTracking() { |
| return getInstance().isRefCountTracking(); |
| } |
| |
| /** |
| * Call this method to undo a call to skipRefCountTracking. |
| */ |
| public static void unskipRefCountTracking() { |
| getInstance().unskipRefCountTracking(); |
| } |
| |
| /** |
| * Returns a list of any reference count tracking information for the given Chunk address. |
| */ |
| public static List<RefCountChangeInfo> getRefCountInfo(long address) { |
| return getInstance().getRefCountInfo(address); |
| } |
| |
| /** |
| * Used internally to report that a reference count has changed. |
| */ |
| static void refCountChanged(Long address, boolean decRefCount, int rc) { |
| getInstance().refCountChanged(address, decRefCount, rc); |
| } |
| |
| /** |
| * Called internally when free operations are tracked to record that a free has happened of the |
| * given address. |
| */ |
| static void freeRefCountInfo(Long address) { |
| getInstance().freeRefCountInfo(address); |
| } |
| |
| /** |
| * Returns the thread local owner |
| */ |
| static Object getReferenceCountOwner() { |
| return getInstance().getReferenceCountOwner(); |
| } |
| |
| /** |
| * Returns the thread local count of the number of times ref count has been updated |
| */ |
| static AtomicInteger getReenterCount() { |
| return getInstance().getReenterCount(); |
| } |
| |
| /** |
| * Returns a list of any free operation tracking information. This is used to describe who did the |
| * previous free(s) when an extra one ends up being done and fails. |
| */ |
| public static List<RefCountChangeInfo> getFreeRefCountInfo(long address) { |
| return getInstance().getFreeRefCountInfo(address); |
| } |
| |
| /** |
| * Returns a list of any reference count tracking information for the given Chunk address without |
| * locking. |
| */ |
| static List<RefCountChangeInfo> peekRefCountInfo(long address) { |
| return getInstance().peekRefCountInfo(address); |
| } |
| } |