View Javadoc
1 /*** 2 * Redistribution and use of this software and associated documentation 3 * ("Software"), with or without modification, are permitted provided 4 * that the following conditions are met: 5 * 6 * 1. Redistributions of source code must retain copyright 7 * statements and notices. Redistributions must also contain a 8 * copy of this document. 9 * 10 * 2. Redistributions in binary form must reproduce the 11 * above copyright notice, this list of conditions and the 12 * following disclaimer in the documentation and/or other 13 * materials provided with the distribution. 14 * 15 * 3. The name "Exolab" must not be used to endorse or promote 16 * products derived from this Software without prior written 17 * permission of Exoffice Technologies. For written permission, 18 * please contact info@exolab.org. 19 * 20 * 4. Products derived from this Software may not be called "Exolab" 21 * nor may "Exolab" appear in their names without prior written 22 * permission of Exoffice Technologies. Exolab is a registered 23 * trademark of Exoffice Technologies. 24 * 25 * 5. Due credit should be given to the Exolab Project 26 * (http://www.exolab.org/). 27 * 28 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 32 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 39 * OF THE POSSIBILITY OF SUCH DAMAGE. 40 * 41 * Copyright 1999 (C) Exoffice Technologies Inc. All Rights Reserved. 42 * 43 * $Id: BaseLease.java,v 1.6 2003/08/17 01:32:24 tanderson Exp $ 44 * 45 * Date Author Changes 46 * 2/29/2000 jima Created 47 */ 48 package org.exolab.jms.lease; 49 50 51 import java.io.Serializable; 52 53 54 /*** 55 * This is the implementation of a non-specific lease object. It can be used to 56 * lease any Objeect. . 57 * 58 * @version $Revision: 1.6 $ $Date: 2003/08/17 01:32:24 $ 59 * @author <a href="mailto:jima@exoffice.com">Jim Alateras</a> 60 **/ 61 public class BaseLease 62 implements LeaseIfc, Comparable, Serializable { 63 64 /*** 65 * Default constructor for the Serailizable/Externalizable interface 66 */ 67 public BaseLease() { 68 } 69 70 /*** 71 * Construct an instance of this class with the specified objct, and duration 72 * 73 * @param object leased object 74 * @param duration duration of lease 75 * @param listener will get notified on lease events 76 */ 77 public BaseLease(Object object, long duration, LeaseEventListenerIfc listener) { 78 79 // test for preconditions 80 if ((object == null) || 81 (listener == null)) { 82 throw new IllegalArgumentException("object or listener cannot be null"); 83 } 84 85 leasedObject_ = object; 86 duration_ = duration; 87 expiryTime_ = System.currentTimeMillis() + duration; 88 listener_ = listener; 89 } 90 91 // implementation for LeaseIfc.getExpiryTime() 92 public long getExpiryTime() { 93 return expiryTime_; 94 } 95 96 // implementation for LeaseIfc.getDuration() 97 public long getDuration() { 98 return duration_; 99 } 100 101 // implementation for LeaseIfc.getDuration() 102 public void setDuration(long duration) { 103 duration_ = duration; 104 expiryTime_ = System.currentTimeMillis() + duration; 105 } 106 107 // implementation for LeaseIfc.getRemainingTime() 108 public long getRemainingTime() { 109 return (System.currentTimeMillis() - expiryTime_); 110 } 111 112 // implementation for LeaseIfc.getLeasedObject() 113 public Object getLeasedObject() { 114 return leasedObject_; 115 } 116 117 // implementation for LeaseIfc.getLeasedObjectType() 118 public Class getLeasedObjectType() { 119 return leasedObject_.getClass(); 120 } 121 122 /*** 123 * Return a reference to the listener registered with this object 124 * 125 * @return LeaseEventListenerIfc 126 */ 127 public LeaseEventListenerIfc getLeaseEventListener() { 128 return listener_; 129 } 130 131 /*** 132 * Compares this object with the specified object. It returns a negative 133 * integer is this object is less than the specified object; zero if this 134 * object is equal to the specified object or a positive integer if this 135 * object is greater than the specified object 136 * <p> 137 * The comparison is based on the expiration time. 138 */ 139 public int compareTo(Object object) { 140 int result = 0; 141 142 if (object instanceof BaseLease) { 143 BaseLease lease = (BaseLease) object; 144 if (lease.getExpiryTime() != this.getExpiryTime()) { 145 if (lease.getExpiryTime() > this.getExpiryTime()) { 146 result = -1; 147 } else { 148 result = 1; 149 } 150 } 151 } 152 return result; 153 } 154 155 /*** 156 * Notify the listeners that this lease has expird. This method has 157 * package level scope. 158 */ 159 void notifyLeaseExpired() { 160 synchronized (listener_) { 161 listener_.onLeaseExpired(leasedObject_); 162 } 163 } 164 165 /*** 166 * Return a string representation of this object 167 * 168 * @return String 169 */ 170 public String toString() { 171 StringBuffer buf = new StringBuffer(leasedObject_.toString()); 172 buf.append(" duration = "); 173 buf.append(duration_); 174 buf.append(" expiryTime = "); 175 buf.append(expiryTime_); 176 177 return buf.toString(); 178 } 179 180 181 /*** 182 * This is the object that is leased 183 */ 184 protected Object leasedObject_ = null; 185 186 /*** 187 * The duration of the lease in milliseconds 188 */ 189 protected long duration_ = 0L; 190 191 /*** 192 * This is the time that the lease will expire 193 */ 194 protected long expiryTime_ = 0L; 195 196 /*** 197 * The listener that will be notified when the lease expires 198 */ 199 protected LeaseEventListenerIfc listener_ = null; 200 } 201

This page was automatically generated by Maven