1/*
2 * Copyright (C) 2010 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
17package android.net;
18
19import org.apache.harmony.xnet.provider.jsse.FileClientSessionCache;
20import org.apache.harmony.xnet.provider.jsse.SSLClientSessionCache;
21
22import android.content.Context;
23import android.util.Log;
24
25import java.io.File;
26import java.io.IOException;
27
28/**
29 * File-based cache of established SSL sessions.  When re-establishing a
30 * connection to the same server, using an SSL session cache can save some time,
31 * power, and bandwidth by skipping directly to an encrypted stream.
32 * This is a persistent cache which can span executions of the application.
33 *
34 * @see SSLCertificateSocketFactory
35 */
36public final class SSLSessionCache {
37    private static final String TAG = "SSLSessionCache";
38    /* package */ final SSLClientSessionCache mSessionCache;
39
40    /**
41     * Create a session cache using the specified directory.
42     * Individual session entries will be files within the directory.
43     * Multiple instances for the same directory share data internally.
44     *
45     * @param dir to store session files in (created if necessary)
46     * @throws IOException if the cache can't be opened
47     */
48    public SSLSessionCache(File dir) throws IOException {
49        mSessionCache = FileClientSessionCache.usingDirectory(dir);
50    }
51
52    /**
53     * Create a session cache at the default location for this app.
54     * Multiple instances share data internally.
55     *
56     * @param context for the application
57     */
58    public SSLSessionCache(Context context) {
59        File dir = context.getDir("sslcache", Context.MODE_PRIVATE);
60        SSLClientSessionCache cache = null;
61        try {
62            cache = FileClientSessionCache.usingDirectory(dir);
63        } catch (IOException e) {
64            Log.w(TAG, "Unable to create SSL session cache in " + dir, e);
65        }
66        mSessionCache = cache;
67    }
68}
69