1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 *
19 */
20 package org.apache.mina.transport.socket.apr;
21
22 import org.apache.tomcat.jni.Library;
23 import org.apache.tomcat.jni.Pool;
24
25 /**
26 * Internal singleton used for initializing corretcly the APR native library
27 * and the associated memory pool.
28 *
29 * @author The Apache MINA Project (dev@mina.apache.org)
30 * @version $Rev: 596971 $, $Date: 2007-11-21 00:43:06 -0700 (Wed, 21 Nov 2007) $
31 */
32 class AprLibrary {
33
34 // is APR library was initialized (load of native libraries)
35 private static AprLibrary library = null;
36
37 static synchronized AprLibrary getInstance() {
38 if (!isInitialized())
39 initialize();
40 return library;
41 }
42
43 static synchronized void initialize() {
44 if (library == null)
45 library = new AprLibrary();
46 }
47
48 static synchronized boolean isInitialized() {
49 return library != null;
50 }
51
52 // APR memory pool (package wide mother pool)
53 private final long pool;
54
55 private AprLibrary() {
56 try {
57 Library.initialize(null);
58 } catch (Exception e) {
59 throw new RuntimeException(
60 "Error loading Apache Portable Runtime (APR).", e);
61 }
62 pool = Pool.create(0);
63 }
64
65 @Override
66 protected void finalize() throws Throwable {
67 super.finalize();
68 Pool.destroy(pool);
69 }
70
71 long getRootPool() {
72 return pool;
73 }
74 }