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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package org.apache.harmony.xnet.provider.jsse;
     18 
     19 import java.util.HashMap;
     20 import java.util.Map;
     21 import javax.net.ssl.SSLSession;
     22 
     23 /**
     24  * Caches client sessions. Indexes by host and port. Users are typically
     25  * looking to reuse any session for a given host and port.
     26  */
     27 public class ClientSessionContext extends AbstractSessionContext {
     28 
     29     /**
     30      * Sessions indexed by host and port. Protect from concurrent
     31      * access by holding a lock on sessionsByHostAndPort.
     32      */
     33     final Map<HostAndPort, SSLSession> sessionsByHostAndPort
     34         = new HashMap<HostAndPort, SSLSession>();
     35 
     36     private SSLClientSessionCache persistentCache;
     37 
     38     public ClientSessionContext() {
     39         super(10, 0);
     40     }
     41 
     42     public void setPersistentCache(SSLClientSessionCache persistentCache) {
     43         this.persistentCache = persistentCache;
     44     }
     45 
     46     protected void sessionRemoved(SSLSession session) {
     47         String host = session.getPeerHost();
     48         int port = session.getPeerPort();
     49         if (host == null) {
     50             return;
     51         }
     52         HostAndPort hostAndPortKey = new HostAndPort(host, port);
     53         synchronized (sessionsByHostAndPort) {
     54             sessionsByHostAndPort.remove(hostAndPortKey);
     55         }
     56     }
     57 
     58     /**
     59      * Finds a cached session for the given host name and port.
     60      *
     61      * @param host of server
     62      * @param port of server
     63      * @return cached session or null if none found
     64      */
     65     public SSLSession getSession(String host, int port) {
     66         if (host == null) {
     67             return null;
     68         }
     69         SSLSession session;
     70         HostAndPort hostAndPortKey = new HostAndPort(host, port);
     71         synchronized (sessionsByHostAndPort) {
     72             session = sessionsByHostAndPort.get(hostAndPortKey);
     73         }
     74         if (session != null && session.isValid()) {
     75             return session;
     76         }
     77 
     78         // Look in persistent cache.
     79         if (persistentCache != null) {
     80             byte[] data = persistentCache.getSessionData(host, port);
     81             if (data != null) {
     82                 session = toSession(data, host, port);
     83                 if (session != null && session.isValid()) {
     84                     super.putSession(session);
     85                     synchronized (sessionsByHostAndPort) {
     86                         sessionsByHostAndPort.put(hostAndPortKey, session);
     87                     }
     88                     return session;
     89                 }
     90             }
     91         }
     92 
     93         return null;
     94     }
     95 
     96     @Override
     97     void putSession(SSLSession session) {
     98         super.putSession(session);
     99 
    100         String host = session.getPeerHost();
    101         int port = session.getPeerPort();
    102         if (host == null) {
    103             return;
    104         }
    105 
    106         HostAndPort hostAndPortKey = new HostAndPort(host, port);
    107         synchronized (sessionsByHostAndPort) {
    108             sessionsByHostAndPort.put(hostAndPortKey, session);
    109         }
    110 
    111         // TODO: This in a background thread.
    112         if (persistentCache != null) {
    113             byte[] data = toBytes(session);
    114             if (data != null) {
    115                 persistentCache.putSessionData(session, data);
    116             }
    117         }
    118     }
    119 
    120     static class HostAndPort {
    121         final String host;
    122         final int port;
    123 
    124         HostAndPort(String host, int port) {
    125             this.host = host;
    126             this.port = port;
    127         }
    128 
    129         @Override
    130         public int hashCode() {
    131             return host.hashCode() * 31 + port;
    132         }
    133 
    134         @Override
    135         @SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
    136         public boolean equals(Object o) {
    137             HostAndPort other = (HostAndPort) o;
    138             return host.equals(other.host) && port == other.port;
    139         }
    140     }
    141 }
    142