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| <pre><span class="sourceLineNo">001</span>package org.apache.archiva.components.cache;<a name="line.1"></a> |
| <span class="sourceLineNo">002</span><a name="line.2"></a> |
| <span class="sourceLineNo">003</span>/*<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * or more contributor license agreements. See the NOTICE file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * distributed with this work for additional information<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * regarding copyright ownership. The ASF licenses this file<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * to you under the Apache License, Version 2.0 (the<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * "License"); you may not use this file except in compliance<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * with the License. You may obtain a copy of the License at<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> *<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * Unless required by applicable law or agreed to in writing,<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * software distributed under the License is distributed on an<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * KIND, either express or implied. See the License for the<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> * specific language governing permissions and limitations<a name="line.18"></a> |
| <span class="sourceLineNo">019</span> * under the License.<a name="line.19"></a> |
| <span class="sourceLineNo">020</span> */<a name="line.20"></a> |
| <span class="sourceLineNo">021</span><a name="line.21"></a> |
| <span class="sourceLineNo">022</span>/**<a name="line.22"></a> |
| <span class="sourceLineNo">023</span> * Cache interface.<a name="line.23"></a> |
| <span class="sourceLineNo">024</span> *<a name="line.24"></a> |
| <span class="sourceLineNo">025</span> * @author <a href="mailto:joakim@erdfelt.com">Joakim Erdfelt</a><a name="line.25"></a> |
| <span class="sourceLineNo">026</span> */<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>public interface Cache<V, T><a name="line.27"></a> |
| <span class="sourceLineNo">028</span>{<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> /**<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * Tests to see if the provided key exists within the cache.<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * <p/><a name="line.31"></a> |
| <span class="sourceLineNo">032</span> * NOTE: Due to synchronization issues, if this method returns true, a subsequent request<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * to the {@link #get(Object)} method on the same key might return null as the period of time<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> * between the 2 request might have been long enough for the underlying Cache implementation<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * to remove the key.<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> *<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * @param key the key to test.<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * @return true if the key exists.<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> */<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> boolean hasKey( V key );<a name="line.40"></a> |
| <span class="sourceLineNo">041</span><a name="line.41"></a> |
| <span class="sourceLineNo">042</span> /**<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * Get the value of the specified key, if it exists in the cache.<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> *<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> * @param key the key to fetch the contents of.<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> * @return the value of the key, or null if not found.<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> */<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> T get( V key );<a name="line.48"></a> |
| <span class="sourceLineNo">049</span><a name="line.49"></a> |
| <span class="sourceLineNo">050</span><a name="line.50"></a> |
| <span class="sourceLineNo">051</span> /**<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> * Put the specified value into the cache under the provided key.<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> *<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> * @param key the key to put the value into<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> * @param value the object to place into the cache.<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> * @return the previous value for the key, or null if the key contained no value.<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> */<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> T put( V key, T value );<a name="line.58"></a> |
| <span class="sourceLineNo">059</span><a name="line.59"></a> |
| <span class="sourceLineNo">060</span><a name="line.60"></a> |
| <span class="sourceLineNo">061</span> /**<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> * Register the specified value into the cache under the provided key.<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> * <p/><a name="line.63"></a> |
| <span class="sourceLineNo">064</span> * This {@link #register(Object, Object)} method is just an optimized version of the {@link #put(Object, Object)}<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> * method, but does not return the previous value contained with the specified key.<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> *<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * @param key the key to put the value into<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> * @param value the object to place into the cache.<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> */<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> void register( V key, T value );<a name="line.70"></a> |
| <span class="sourceLineNo">071</span><a name="line.71"></a> |
| <span class="sourceLineNo">072</span> /**<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> * Remove the specified key and value from the cache.<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> *<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> * @param key the key to the value to remove.<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> * @return the value of the key that was removed.<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> */<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> T remove( V key );<a name="line.78"></a> |
| <span class="sourceLineNo">079</span><a name="line.79"></a> |
| <span class="sourceLineNo">080</span> /**<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> * Clear the cache of all entries.<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> */<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> void clear( );<a name="line.83"></a> |
| <span class="sourceLineNo">084</span><a name="line.84"></a> |
| <span class="sourceLineNo">085</span> /**<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> * Obtain a set of Statistics about the performance of the cache.<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> *<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> * @return the cache statistics.<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> */<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> CacheStatistics getStatistics( );<a name="line.90"></a> |
| <span class="sourceLineNo">091</span><a name="line.91"></a> |
| <span class="sourceLineNo">092</span> void setTimeToIdleSeconds( int timeToIdleSeconds );<a name="line.92"></a> |
| <span class="sourceLineNo">093</span><a name="line.93"></a> |
| <span class="sourceLineNo">094</span> void setTimeToLiveSeconds( int timeToLiveSeconds );<a name="line.94"></a> |
| <span class="sourceLineNo">095</span><a name="line.95"></a> |
| <span class="sourceLineNo">096</span> int getTimeToIdleSeconds( );<a name="line.96"></a> |
| <span class="sourceLineNo">097</span><a name="line.97"></a> |
| <span class="sourceLineNo">098</span> int getTimeToLiveSeconds( );<a name="line.98"></a> |
| <span class="sourceLineNo">099</span><a name="line.99"></a> |
| <span class="sourceLineNo">100</span> int getMaxElementsInMemory( );<a name="line.100"></a> |
| <span class="sourceLineNo">101</span><a name="line.101"></a> |
| <span class="sourceLineNo">102</span> void setMaxElementsInMemory( int maxElementsInMemory );<a name="line.102"></a> |
| <span class="sourceLineNo">103</span><a name="line.103"></a> |
| <span class="sourceLineNo">104</span> int getMaxElementsOnDisk( );<a name="line.104"></a> |
| <span class="sourceLineNo">105</span><a name="line.105"></a> |
| <span class="sourceLineNo">106</span> void setMaxElementsOnDisk( int maxElementsOnDisk );<a name="line.106"></a> |
| <span class="sourceLineNo">107</span><a name="line.107"></a> |
| <span class="sourceLineNo">108</span>}<a name="line.108"></a> |
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| </pre> |
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