/* | |
* Copyright 2004,2005 The Apache Software Foundation. | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
package org.apache.rampart; | |
import java.util.*; | |
import java.util.concurrent.locks.ReentrantLock; | |
/** | |
* This is a basic implementation of UniqueMessageAttributeCache. In this implementation we will cache incomming | |
* nonce value for a period of time. The life time can be defined in the services.xml. If not defined | |
* the default value will be 5 minutes. | |
*/ | |
public class NonceCache extends AbstractUniqueMessageAttributeCache { | |
class Nonce | |
{ | |
String nonceValue; | |
String userName; | |
public Nonce(String nonce, String user) | |
{ | |
this.nonceValue = nonce; | |
this.userName = user; | |
} | |
@Override | |
public boolean equals(Object another) | |
{ | |
if (another == null){ | |
return false; | |
} | |
if (another == this) { | |
return true; | |
} | |
if (!(another instanceof Nonce)){ | |
return false; | |
} | |
Nonce otherNonce = (Nonce)another; | |
if (this.userName.equals(otherNonce.userName) && this.nonceValue.equals(otherNonce.nonceValue)) | |
{ | |
return true; | |
} | |
return false; | |
} | |
@Override | |
public int hashCode() | |
{ | |
return (this.userName.hashCode() * 13 + this.nonceValue.hashCode() * 7); | |
} | |
} | |
private Map<Nonce, Calendar> mapIdNonce = new HashMap<Nonce, Calendar>(); | |
private final ReentrantLock lock = new ReentrantLock(); | |
public NonceCache() | |
{ | |
super(); | |
} | |
public NonceCache(int maxLifeTime) | |
{ | |
super(maxLifeTime); | |
} | |
public void addToCache(String id, String userName) { | |
Nonce nonce = new Nonce(id, userName); | |
Calendar rightNow = Calendar.getInstance(); | |
lock.lock(); | |
try { | |
mapIdNonce.put(nonce, rightNow); | |
} finally { | |
lock.unlock(); | |
} | |
} | |
public boolean valueExistsInCache(String id, String userName) { | |
lock.lock(); | |
try { | |
clearStaleNonceIds(); | |
} finally { | |
lock.unlock(); | |
} | |
Nonce nonce = new Nonce(id, userName); | |
return mapIdNonce.containsKey(nonce); | |
} | |
public void clearCache() { | |
lock.lock(); | |
try { | |
mapIdNonce.clear(); | |
} finally { | |
lock.unlock(); | |
} | |
} | |
/** | |
* This method will clear stale nonce ids from the map. | |
*/ | |
private void clearStaleNonceIds() | |
{ | |
Calendar rightNow = Calendar.getInstance(); | |
int maxLifeTime = getMaximumLifeTimeOfAnAttribute(); | |
rightNow.add(Calendar.SECOND, -(maxLifeTime)); | |
long timeBeforeMaxLifeTime = rightNow.getTimeInMillis(); | |
Iterator<Map.Entry<Nonce, Calendar>> iterator = mapIdNonce.entrySet().iterator(); | |
while (iterator.hasNext()) { | |
Map.Entry<Nonce, Calendar> pair = iterator.next(); | |
Calendar itemDate = pair.getValue(); | |
long itemAddedTime = itemDate.getTimeInMillis(); | |
if (timeBeforeMaxLifeTime > itemAddedTime) | |
{ | |
iterator.remove(); | |
} | |
} | |
} | |
} |