| /* |
| * Copyright (c) 2020, 2021 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| package org.eclipse.persistence.internal.helper.type; |
| |
| import org.eclipse.persistence.internal.helper.ConcurrencyManager; |
| |
| import java.io.Serializable; |
| import java.util.Date; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| /** |
| * Metadata about ReadLock acquisition |
| */ |
| public class ReadLockAcquisitionMetadata implements Serializable { |
| |
| private static final AtomicLong READ_LOCK_GLOBAL_ACQUISITION_NUMBER = new AtomicLong(0); |
| |
| /** |
| * Each time a read lock is acquired we generate a new number for this read lock acquision. |
| */ |
| private final long readLockGlobalAcquisitionNumber = READ_LOCK_GLOBAL_ACQUISITION_NUMBER.incrementAndGet(); |
| |
| /** |
| * Date when this event of trying to acquire a read lock has take place. |
| */ |
| private final Date dateOfReadLockAcquisition = new Date(); |
| |
| /** |
| * This is the cache key whose number of readers is about to be incremented |
| */ |
| private final ConcurrencyManager cacheKeyWhoseNumberOfReadersThreadIsIncrementing; |
| |
| /** |
| * This is the current number of readers on the cache key just before we execute the increment. |
| */ |
| private final int numberOfReadersOnCacheKeyBeforeIncrementingByOne; |
| |
| /** |
| * If enabled we will trace the exact code location that did the increment of number of readers. |
| */ |
| private final String currentThreadStackTraceInformation; |
| |
| /** |
| * how expensive was it to acquire the stack trace. This might be too expensive for being used live. |
| */ |
| private final long currentThreadStackTraceInformationCpuTimeCostMs; |
| |
| /** |
| * Create a new ReadLockAcquisitionMetadata. |
| * |
| */ |
| public ReadLockAcquisitionMetadata( |
| ConcurrencyManager cacheKeyWhoseNumberOfReadersThreadIsIncrementing, |
| int numberOfReadersOnCacheKeyBeforeIncrementingByOne, |
| String currentThreadStackTraceInformation, long currentThreadStackTraceInformationCpuTimeCostMs) { |
| super(); |
| this.cacheKeyWhoseNumberOfReadersThreadIsIncrementing = cacheKeyWhoseNumberOfReadersThreadIsIncrementing; |
| this.numberOfReadersOnCacheKeyBeforeIncrementingByOne = numberOfReadersOnCacheKeyBeforeIncrementingByOne; |
| this.currentThreadStackTraceInformation = currentThreadStackTraceInformation; |
| this.currentThreadStackTraceInformationCpuTimeCostMs = currentThreadStackTraceInformationCpuTimeCostMs; |
| } |
| |
| /** Getter for {@link #readLockGlobalAcquisitionNumber} */ |
| public long getReadLockGlobalAcquisitionNumber() { |
| return readLockGlobalAcquisitionNumber; |
| } |
| |
| /** Getter for {@link #dateOfReadLockAcquisition} */ |
| public Date getDateOfReadLockAcquisition() { |
| return dateOfReadLockAcquisition; |
| } |
| |
| /** Getter for {@link #cacheKeyWhoseNumberOfReadersThreadIsIncrementing} */ |
| public ConcurrencyManager getCacheKeyWhoseNumberOfReadersThreadIsIncrementing() { |
| return cacheKeyWhoseNumberOfReadersThreadIsIncrementing; |
| } |
| |
| /** Getter for {@link #numberOfReadersOnCacheKeyBeforeIncrementingByOne} */ |
| public int getNumberOfReadersOnCacheKeyBeforeIncrementingByOne() { |
| return numberOfReadersOnCacheKeyBeforeIncrementingByOne; |
| } |
| |
| /** Getter for {@link #currentThreadStackTraceInformation} */ |
| public String getCurrentThreadStackTraceInformation() { |
| return currentThreadStackTraceInformation; |
| } |
| |
| |
| /** Getter for {@link #currentThreadStackTraceInformationCpuTimeCostMs} */ |
| public long getCurrentThreadStackTraceInformationCpuTimeCostMs() { |
| return currentThreadStackTraceInformationCpuTimeCostMs; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + (int) (readLockGlobalAcquisitionNumber ^ (readLockGlobalAcquisitionNumber >>> 32)); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null) { |
| return false; |
| } |
| if (getClass() != obj.getClass()) { |
| return false; |
| } |
| ReadLockAcquisitionMetadata other = (ReadLockAcquisitionMetadata) obj; |
| if (readLockGlobalAcquisitionNumber != other.readLockGlobalAcquisitionNumber) { |
| return false; |
| } |
| return true; |
| } |
| |
| @Override |
| public String toString() { |
| return "ReadLockAcquisitionMetadataDto [\nreadLockGlobalAcquisitionNumber=" + readLockGlobalAcquisitionNumber |
| + "\n, dateOfReadLockAcquisition=" + dateOfReadLockAcquisition |
| + "\n, cacheKeyWhoseNumberOfReadersThreadIsIncrementing=" + cacheKeyWhoseNumberOfReadersThreadIsIncrementing |
| + "\n, numberOfReadersOnCacheKeyBeforeIncrementingByOne=" + numberOfReadersOnCacheKeyBeforeIncrementingByOne |
| + "\n, currentThreadStackTraceInformation=" + currentThreadStackTraceInformation |
| + "\n, currentThreadStackTraceInformationCpuTimeCostMs=" + currentThreadStackTraceInformationCpuTimeCostMs + "]\n"; |
| } |
| } |