001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.pool2; 018 019import java.time.Instant; 020 021/** 022 * Allows pooled objects to make information available about when and how they were used available to the object pool. 023 * The object pool may, but is not required, to use this information to make more informed decisions when determining 024 * the state of a pooled object - for instance whether or not the object has been abandoned. 025 * 026 * @since 2.0 027 */ 028public interface TrackedUse { 029 030 /** 031 * Gets the last time this object was used in milliseconds. 032 * 033 * @return the last time this object was used in milliseconds. 034 * @deprecated Use {@link #getLastUsedInstant()} which offers the best precision. 035 */ 036 @Deprecated 037 long getLastUsed(); 038 039 /** 040 * Gets the last Instant this object was used. 041 * <p> 042 * Starting with Java 9, the JRE {@code SystemClock} precision is increased usually down to microseconds, or tenth 043 * of microseconds, depending on the OS, Hardware, and JVM implementation. 044 * </p> 045 * 046 * @return the last Instant this object was used. 047 * @since 2.11.0 048 */ 049 default Instant getLastUsedInstant() { 050 return Instant.ofEpochMilli(getLastUsed()); 051 } 052}