001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 * 019 */ 020 package org.apache.directory.shared.ldap.message; 021 022 023 import java.util.Observable; 024 import java.util.Observer; 025 026 import org.apache.directory.shared.ldap.codec.MessageTypeEnum; 027 import org.apache.directory.shared.ldap.message.internal.InternalAbandonableRequest; 028 import org.apache.directory.shared.ldap.message.internal.InternalAbstractRequest; 029 030 031 /** 032 * The base abandonable request message class. All such requests have a reponse 033 * type. 034 * 035 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 036 * @version $Rev: 910150 $ 037 */ 038 public class AbstractAbandonableRequest extends InternalAbstractRequest implements InternalAbandonableRequest 039 { 040 static final long serialVersionUID = -4511116249089399040L; 041 042 /** Flag indicating whether or not this request returns a response. */ 043 private boolean abandoned = false; 044 045 private RequestObservable o; 046 047 048 /** 049 * Subclasses must provide these parameters via a super constructor call. 050 * 051 * @param id 052 * the sequential message identifier 053 * @param type 054 * the request type enum 055 */ 056 protected AbstractAbandonableRequest( final int id, final MessageTypeEnum type ) 057 { 058 super( id, type, true ); 059 } 060 061 062 public void abandon() 063 { 064 if ( abandoned ) 065 { 066 return; 067 } 068 069 abandoned = true; 070 if ( o == null ) 071 { 072 o = new RequestObservable(); 073 } 074 o.setChanged(); 075 o.notifyObservers(); 076 o.deleteObservers(); 077 } 078 079 080 public boolean isAbandoned() 081 { 082 return abandoned; 083 } 084 085 086 public void addAbandonListener( final AbandonListener listener ) 087 { 088 if ( o == null ) 089 { 090 o = new RequestObservable(); 091 } 092 093 o.addObserver( new Observer() 094 { 095 public void update( Observable o, Object arg ) 096 { 097 listener.requestAbandoned( AbstractAbandonableRequest.this ); 098 } 099 } ); 100 } 101 102 103 class RequestObservable extends Observable 104 { 105 public void setChanged() 106 { 107 super.setChanged(); 108 } 109 } 110 }