1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.pool2; 18 19 import java.time.Instant; 20 21 /** 22 * Allows pooled objects to make information available about when and how they were used available to the object pool. 23 * The object pool may, but is not required, to use this information to make more informed decisions when determining 24 * the state of a pooled object - for instance whether or not the object has been abandoned. 25 * 26 * @since 2.0 27 */ 28 public interface TrackedUse { 29 30 /** 31 * Gets the last time this object was used in milliseconds. 32 * 33 * @return the last time this object was used in milliseconds. 34 * @deprecated Use {@link #getLastUsedInstant()} which offers the best precision. 35 */ 36 @Deprecated 37 long getLastUsed(); 38 39 /** 40 * Gets the last Instant this object was used. 41 * <p> 42 * Starting with Java 9, the JRE {@code SystemClock} precision is increased usually down to microseconds, or tenth 43 * of microseconds, depending on the OS, Hardware, and JVM implementation. 44 * </p> 45 * 46 * @return the last Instant this object was used. 47 * @since 2.11.0 48 */ 49 default Instant getLastUsedInstant() { 50 return Instant.ofEpochMilli(getLastUsed()); 51 } 52 }